Headers in Angular Gantt component

5 Apr 202524 minutes to read

Header text

By default, the header text of a column in Gantt chart is displayed from the column’s field value. However, you can easily override the default header title and provide a custom header text for the column using the headerText property.

To enable the headerText property, you simply need to define it in the e-column. The following example demonstrates how to enable header text for a Gantt column.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';


@Component({
    imports: [
         GanttModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">    
            <e-columns>
                <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
            </e-columns>
       </ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };

    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The headerText property is optional, and if it is not defined, then the corresponding column’s field value is set as header text for that column.

You can also use the headerTemplate property to apply custom HTML content to the header cell.

Header template

You can customize the header element by using the headerTemplate property. With this property, you can render custom HTML elements or Angular components to the header element.

In this demo, the custom element is rendered for both TaskName and Duration column headers.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { projectNewData } from './data';
@Component({
    imports: [
         GanttModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" height="430px" [dataSource]="data" [splitterSettings] = "splitterSettings" [taskFields]="taskSettings">
            <e-columns>
                <e-column field='TaskName' width='290'>
                    <ng-template #headerTemplate>      
                        <div>
                            <img src="../assets/images/TaskName.png" width="20" height="20" class="e-image" />  Task Name
                        </div>
                    </ng-template>
                </e-column>
                <e-column field='startDate' headerText='Start Date' width='390' format="yMd" textAlign='Right'></e-column>
                <e-column field='Duration' headerText='Duration' width='120' textAlign='Right'> 
                    <ng-template #headerTemplate>   
                        <div>
                            <img src="../assets/images/Duration.png" width="20" height="20" class="e-image" />  Duration
                        </div>
                    </ng-template>
                </e-column>
                <e-column field='progress' headerText='Progress' width='120' textAlign='Right'></e-column>
            </e-columns>
       </ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = projectNewData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The headerTemplate property is only applicable to Gantt columns that have a header element.

You can use any HTML or Angular component in the header template to add additional functionality to the header element.

Align the text of header text

You can horizontally align the text in column headers of the Gantt component using the headerTextAlign property. By default, the text is aligned to the left, but you can change the alignment by setting the value of the headerTextAlign property to one of the following options:

Left: Aligns the text to the left (default).
Center: Aligns the text to the center.
Right: Aligns the text to the right.
Justify: Header text is justified.

Here is an example of using the headerTextAlign property to align the text of a Gantt column header:

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { DropDownListModule } from '@syncfusion/ej2-angular-dropdowns';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { ColumnModel } from '@syncfusion/ej2-angular-grids';
import { TextAlign } from '@syncfusion/ej2-angular-grids';
import { ChangeEventArgs } from '@syncfusion/ej2-dropdowns';
import { GanttData } from './data';


@Component({
    imports: [
         GanttModule, DropDownListModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<div style="display: flex">
            <label style="padding: 30px 17px 0 0;">Align the text of header text :</label>
            <ejs-dropdownlist  style="padding: 26px 0 0 0" index="0" width="100" 
            [dataSource]="alignmentData" (change)="changeAlignment($event)">
            </ejs-dropdownlist>
        </div>
        <div class="control-section" style="padding-top:20px">
            <ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
            [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">   
                <e-columns>
                    <e-column field='TaskID' headerText='Task ID' headerTextAlign='Right' width=110 ></e-column>
                    <e-column field='TaskName' headerText='Task Name' width=290></e-column>
                    <e-column field='StartDate' headerText='Start Date' width=120 ></e-column>
                    <e-column field='Duration' headerText='Duration' width=90 ></e-column>
                    <e-column field='Progress' headerText='Progress' width=120></e-column>
                </e-columns>
            </ejs-gantt>
       </div>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public alignmentData: Object[] = [
        { text: 'Left', value: 'Left' },
        { text: 'Right', value: 'Right' },
        { text: 'Center', value: 'Center' },
        { text: 'Justify', value: 'Justify' }
    ];
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    public changeAlignment(args: ChangeEventArgs): void {
        (this.gantt as GanttComponent).treeGrid.grid.columns.forEach((col: any) => {
            (col as ColumnModel).headerTextAlign = (args.value as TextAlign);
        });
        (this.gantt as GanttComponent).treeGrid.refreshHeader()
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The headerTextAlign property only changes the alignment of the text in the column header, and not the content of the column. If you want to align both the column header and content, you can use the textAlign property.

Autowrap the header text

The autowrap allows the cell content of the gantt chart to wrap to the next line when it exceeds the boundary of the specified cell width. The cell content wrapping works based on the position of white space between words. To support the Autowrap functionality in Syncfusion^® Gantt chart, you should set the appropriate width for the columns. The column width defines the maximum width of a column and helps to wrap the content automatically.

To enable autowrap, set the allowTextWrap property of treegrid object in gantt instance to true. You can also configure the auto wrap mode by setting the textWrapSettings.wrapMode property of treegrid object in gantt instance.

Gantt chart provides the below three options for configuring:

Both: This is the default value for wrapMode. With this option, both the gantt header text and content is wrapped.
Header: With this option, only the gantt header text is wrapped.
Content: With this option, only the gantt content is wrapped.

If a column width is not specified, then the Autowrap of columns will be adjusted with respect to the gantt chart’s width.

If a column’s header text contains no white space, the text may not be wrapped.

If the content of a cell contains HTML tags, the Autowrap functionality may not work as expected. In such cases, you can use the headerTemplate and template properties of the column to customize the appearance of the header and cell content.

In the example below, the textWrapSettings.wrapMode property is set to Header; only the gantt header text is wraps to the next line.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { TextWrapSettingsModel, WrapMode } from '@syncfusion/ej2-angular-grids';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { ChangeEventArgs } from '@syncfusion/ej2-dropdowns';
import { GanttData } from './data';


@Component({
    imports: [
         GanttModule, DropDownListAllModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<div style="display: flex">
            <label style="padding: 30px 17px 0 0" >Autowrap for header column :</label>
            <ejs-dropdownlist style="padding: 26px 0 0 0" index="0" width="100" 
            [dataSource]=" dropdownData" (change)="valueChange($event)">
            </ejs-dropdownlist>
        </div>
        <div class="control-section" style="padding-top:20px">
            <ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
            [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings" (load)="load()"> 
                <e-columns>
                    <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                    <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=250></e-column>
                    <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                    <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                    <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
                </e-columns>
            </ejs-gantt>
       </div>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public dropdownData: Object[] = [
        { text: 'Header', value: 'Header' },
        { text: 'Both', value: 'Both' },
    ];
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    load() {
        (this.gantt as GanttComponent).treeGrid.textWrapSettings.wrapMode = 'Header';
        (this.gantt as GanttComponent).treeGrid.allowTextWrap = true
    }
    valueChange(args: ChangeEventArgs): void {
        (this.gantt as GanttComponent).treeGrid.textWrapSettings.wrapMode = (args.value as WrapMode);
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Change the height of header

Changing the height of the header can be useful in cases where the default height is not sufficient to display the header content cell. For example, if you have a header with a lot of text or if you want to add an image to the header, you may need to increase the height of the header to accommodate the content.This can be easily achieved by changing the height of the header using CSS or by dynamically adjusting the height in JavaScript.

Using css

You can use CSS to override the default height of the .e-gantt .e-headercell class to change the height of the header. Here is an example code snippet:

.e-gantt .e-headercell {
  height: 130px;
}

Using methods

To change the height of the header dynamically, you can use the getHeaderContent method of treegrid object in gantt instance to get the header content element of the gantt. Then, you can use the querySelectorAll method to get all the header cell elements with the class e-headercell. Finally, you can loop through each header cell element and set its style property to adjust the height.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { ButtonModule } from "@syncfusion/ej2-angular-buttons";

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule, ButtonModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<div>
            <button ejs-button id="small" cssClass="e-small" 
            (click)="changeHeaderHeight($event)">
            Change height 20px</button>
            <button ejs-button id="medium" cssClass="e-small" 
            (click)="changeHeaderHeight($event)">
            Default height 42px</button>
            <button ejs-button  id="big" cssClass="e-small" 
            (click)="changeHeaderHeight($event)">
            Change height 60px</button>
        </div>
        <div class="control-section" style="padding-top:20px">
            <ejs-gantt #gantt  [dataSource]="data" height='430' [treeColumnIndex]='1'
            [taskFields]="taskSettings"  [splitterSettings] = "splitterSettings">                
                <e-columns>
                    <e-column field='TaskID' headerText='Task ID'  width=100></e-column>
                    <e-column field='TaskName' headerText='Task Name' width=290 ></e-column>
                    <e-column field='Duration' headerText='Duration' width=90></e-column>
                    <e-column field='Progress' headerText='Progress' width=120 ></e-column>
                </e-columns> 
            </ejs-gantt>
        </div>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };

    }
    changeHeaderHeight(event: MouseEvent): void {
        const heightMap: { [key: string]: string } = {
            small: '20px',
            medium: '42px',
            big: '60px'
        };
        const headerCells = (this.gantt as GanttComponent).treeGrid.getHeaderContent().querySelectorAll('.e-headercell');
        headerCells.forEach((headerCell: Element) => {
            (headerCell as HTMLElement).style.height = (heightMap)[
                (event.target as HTMLButtonElement).id
            ];
        });

    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

You can also use the getHeaderTable method of treegrid object in gantt instance to get the table element of the header, and then adjust the height.

You cannot change the height of row below the default height of 42px using the e-columnheader class.

Change header text dynamically

The Syncfusion^® Gantt chart component provides a way to modify the header text of a corresponding column in real-time based on an event. This feature can be useful in various scenarios, such as displaying a custom header text for a specific column or updating the header text dynamically based on input. By allowing for dynamic changes to the header text, the Gantt chart provides a more flexible and customizable experience.

Using Event

To modify the header text of a corresponding column dynamically, you can use the headerCellInfo event provided by the Syncfusion^® Gantt chart. This event is triggered for each header cell element rendered in the Gantt chart.

When the headerCellInfo event is triggered, it provides a HeaderCellInfoEventArgs object as a parameter. This object contains the following properties:

cell: Defines the header cell that is being modified.
node: Defines the DOM element of the header cell that is being modified.

You can use these properties to access and modify the header text of the corresponding column. Once the header text is modified, you can refresh the Gantt chart to reflect the changes by calling the refreshHeader method of treegrid object in gantt instance.

Using method

The Gantt component provides several methods that allow you to change the column header text dynamically. Here are some of the methods of treegrid object in gantt instance you can use:

getColumnByField: This method takes a field name as a parameter and returns the entire column object that corresponds to that field name, including properties such as headertext, width, and alignment. You can use this method to modify any aspect of the column.
getColumnHeaderByField: Retrieves the header element of a column based on its field name. You can modify the textContent property of the header element to change the header text. This method does not return a reference to the column object itself, only to the header element.
getColumnIndexByField: Retrieves the index of a column based on its field name. You can then use the getColumnByIndex method of grid object in gantt instance to retrieve the column object and modify its headerText property to change the header text.
getColumnByUid: Retrieves the column object based on its unique identifier (UID). You can modify the headerText property of the column object to change the header text.
getColumnHeaderByIndex: Retrieves the header element of a column based on its zero-based index. You can modify the textContent property of the header element to change the header text. This method does not return a reference to the column object itself, only to the header element.
getColumnIndexByUid: Retrieves the index of a column based on its unique identifier (UID). You can then use the getColumnByIndex method of grid object in gantt instance to retrieve the column object and modify its headerText property to change the header text.
getColumnHeaderByUid: Retrieves the header element of a column based on its unique identifier (UID). You can modify the textContent property of the header element to change the header text. This method does not return a reference to the column object itself, only to the header element. If you only have an ng-template for the column header, and the column itself is not defined with a field , then you can use the getColumnHeaderByUid method to get a reference to the header element and modify its text content to change the header text.

When you change the header text dynamically, make sure to refresh the Gantt chart to reflect the changes by calling the refreshHeader method of treegrid object in gantt instance.

The UID is automatically generated by the Gantt chart component and may change whenever the gantt chart is refreshed or updated.

Here is an example of how to change the header text of a column using the getColumnByField method:

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns';
import { TextBoxModule } from '@syncfusion/ej2-angular-inputs';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { Gantt } from '@syncfusion/ej2-gantt';
import { DropDownListComponent } from '@syncfusion/ej2-angular-dropdowns';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';
import { TextBoxComponent } from '@syncfusion/ej2-angular-inputs';

@Component({
    imports: [
         GanttModule, ButtonModule, TextBoxModule, DropDownListAllModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<div style="display: flex">
             <label style="padding: 30px 20px 0 0" > Select column name  :</label>
              <ejs-dropdownlist  #dropdown style="padding: 26px 0 0 0" index='0' width="220" 
              [dataSource]="columnsdata"  >
              </ejs-dropdownlist>
        </div>
        <div>
            <label style="padding: 30px 17px 0 0" >Enter new header text :</label>
            <ejs-textbox #textbox required placeholder="Enter new header text" width="220">
            </ejs-textbox>
        </div>
        <div>
            <label style="padding: 30px 17px 0 0" >Click the change button :</label>
            <button ejs-button id="buttons" (click)="ChangeHeaderText()">Change</button>
        </div>
        <div style="padding: 20px 17px 0 0">
            <ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
            [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">      
                <e-columns>
                    <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                    <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                    <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                    <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                    <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
                </e-columns>
            </ejs-gantt>
        </div>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public columnsdata?: Object[] = [
        { text: 'TaskID', value: 'TaskID' },
        { text: 'TaskName', value: 'TaskName' },
        { text: 'Duration', value: 'Duration' },
        { text: 'Progress', value: 'Progress' },
    ];
    public field?: Object = { text: 'text', value: 'value' };
    @ViewChild('dropdown') public dropdown?: DropDownListComponent;
    @ViewChild('textbox') public textbox?: TextBoxComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };

    }
    public ChangeHeaderText(): void {
        if ((this.textbox as TextBoxComponent).element.value.trim() !== '') {
            const column = (this.gantt as Gantt).treeGrid.grid.getColumnByField(
                (((this.dropdown as DropDownListComponent).value as string))
            );
            column.headerText = (this.textbox as TextBoxComponent).element.value;
            (this.gantt as Gantt).treeGrid.refreshHeader();
        }
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Changing the header text of all columns

If you want to change the header text of all columns in the gantt chart, you can loop through the Columns collection of the gantt and set the headerText property for each column. Here is an example:

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { Column, ColumnModel } from '@syncfusion/ej2-angular-grids';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule, ButtonModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `
        <button ejs-button cssClass="e-success" (click)='changeHeaderText()'>Change Header Text</button>
        <ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data"
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">         
            <e-columns>
                <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                <e-column field='StartDate' headerText='StartDate' textAlign='Right' width=120 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Right' width=150 ></e-column>
                <e-column field='Progress' headerText='Progress' textAlign='Right' width=150></e-column>
            </e-columns>
       </ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public headerTextMap: { [key: string]: string } = {
        'TaskID': 'ID',
        'TaskName': 'Name',
        'StartDate': 'Start Date',
        'Duration': 'Task Duration',
        'Progress': 'Task Progress'
    };
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    changeHeaderText(): void {
        (this.gantt as GanttComponent).treeGrid.grid.columns.forEach((column: ColumnModel | any) => {
            column.headerText = this.headerTextMap[column.field as string];
        });
        (this.gantt as GanttComponent).treeGrid.refreshHeader();
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Change the orientation of header text

By default, the text in the column headers of the Syncfusion^® Gantt chart control is oriented horizontally. However, in some cases, you may want to change the orientation of the header text to vertical, diagonal, or at a custom angle. This can be achieved by adding a custom CSS class to the column header cell using the customAttributes property of the Gantt chart columns.

Follow the below steps to change the orientation of the header text in Gantt chart:

Step 1: Create a CSS class with orientation style for gantt header cell

To rotate the header text, you can create a CSS class with the transform property that rotates the header text 90 degrees. This class will be added to the header cell using the customAttributes property.

.e-gantt .e-headercell.orientationcss  {
  transform: rotate(90deg);
}

Step 2: Add the custom CSS class to the gantt chart column

Once you have created the CSS class, you can add it to the particular column by using the customAttributes property. This property allows you to add any custom attribute to the gantt column.

For example, to add the orientationcss class to the Duration column, you can use the following code:

 <e-column field='Duration' headerText='Duration' textAlign='Center' width=90  [customAttributes]='customAttributes'></e-column>

Step 3: Resize the header cell height

After adding the custom CSS class to a column, you need to resize the header cell height so that the rotated header text is fully visible.

setHeaderHeight(args) {
    let textWidth: number = document.querySelector('.orientationcss > div').scrollWidth;//Obtain the width of the headerText content.
    let headerCell: NodeList = document.querySelectorAll('.e-headercell');
    for(let i: number = 0; i < headerCell.length; i++) {
        (<HTMLElement>headerCell.item(i)).style.height = textWidth + 'px'; //Assign the obtained textWidth as the height of the headerCell.
    }
}

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns';
import {TextBoxModule} from '@syncfusion/ej2-angular-inputs';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule, ButtonModule, DropDownListAllModule, TextBoxModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" #gantt [height]='240'  [dataSource]="data" 
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings" (created)='setHeaderHeight($event)'>
            <e-columns>
                <e-column field='TaskID' headerText='Task ID'  width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' width=290 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Center' width=90  [customAttributes]='customAttributes'></e-column>
                <e-column field='Progress' headerText='Progress' width=120 ></e-column>
            </e-columns>    
       </ejs-gantt>`,
    styleUrls: ['./app.component.css'],
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public customAttributes?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.customAttributes = { class: 'orientationcss' };
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    setHeaderHeight(args: any) {
        // Obtain the width of the headerText content.
        const textWidth = (document.querySelector('.orientationcss > div') as Element).scrollWidth;
        const headerCell: NodeList = document.querySelectorAll('.e-headercell');
        for (let i = 0; i < headerCell.length; i++) {
            // Assign the obtained textWidth as the height of the headerCell.
            (headerCell.item(i) as HTMLElement).style.height = textWidth + 500 + 'px';
        }
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Translate header text using ngx-translate

The ngx-translate library provides internationalization (i18n) and localization (l10n) support for Angular applications. With ngx-translate, you can easily translate your Angular application into multiple languages.

In the context of the Syncfusion^® Angular Gantt chart component, you can use ngx-translate to translate the header text of the Gantt chart’s columns. There are two ways to achieve this: through header text and through header template.

Through header text

To translate the header text of the Gantt chart’s columns using ngx-translate through header text, you can use the translate pipe for the headerText property.

Step 1: Create and Configure the TranslateService

import { Component, ViewChild } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  constructor(public translate: TranslateService) { }

  changeLang(lang: string) {
    this.translate.use(lang);

    setTimeout(
      function (this: GanttComponent) {
        this.refresh();
      }.bind(this.gantt),
      800
    );
  }

  @ViewChild(GanttComponent, { static: true })
  public gantt!: GanttComponent;
  public flag: boolean = true;
  public data: Object[] = [];

  public taskSettings?: object;
  public splitterSettings?: object;
  ngOnInit(): void {
    this.data = [
      {
        TaskID: 1,
        TaskName: 'Identify Site location',
        StartDate: new Date('04/02/2019'),
        lineId: 5,
        start: 'Reims',
        destination: 'France',
        Duration: 4,
        Progress: 50
      },
      {
        TaskID: 2,
        TaskName: 'Perform Soil test',
        lineId: 6,
        start: 'Münster',
        destination: 'Germany',
        StartDate: new Date('04/02/2019'),
        Duration: 4,
        Progress: 50
      },
      {
        TaskID: 3, TaskName: 'Soil test approval',
        lineId: 2,
        start: 'Rio de Janeiro',
        destination: 'Brazil',
        StartDate: new Date('04/02/2019'),
        Duration: 4,
        Progress: 50
      }
    ];
    this.taskSettings = {
      id: 'TaskID',
      name: 'TaskName',
      startDate: 'StartDate',
      duration: 'Duration',
      progress: 'Progress',
      lineID: 'lineID',
      start: 'start',
      destination: 'destination'
    };
    this.splitterSettings = {
      position: '75%'
    };
  }
}

Step 2: Import the TranslateModule and TranslateLoader in your app.module.ts file. You also need to import the HttpClientModule to enable HTTP requests for loading translation files

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClient, HttpClientModule } from '@angular/common/http';
import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';
import { AppComponent } from './app.component';
import { GridAllModule } from '@syncfusion/ej2-angular-grids';
import { CommonModule } from '@angular/common';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { GanttAllModule } from '@syncfusion/ej2-angular-gantt';

export function createTranslateLoader(http: HttpClient) {
  return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}

@NgModule({
  declarations: [AppComponent],
  imports: [
    HttpClientModule,
    BrowserModule,
    GridAllModule,
    GanttModule,
    CommonModule,
    GanttAllModule,
    ButtonModule,
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: (createTranslateLoader),
        deps: [HttpClient],
      },
      defaultLanguage: '',
    }),  
  ],
  
  bootstrap: [AppComponent],
})
export class AppModule {}

In the above code, we import the required modules and define a function called HttpLoaderFactory that returns an instance of TranslateHttpLoader, which is used to load translation files.

Step 3: Use the translate pipe in your HTML code to translate the headerText of the column.

<h1> Ngx translate pipe for header text in Angular Gantt component</h1>
<h1></h1>
<div class="container-fluid py-3">
  <div class="btn-group btn-group-sm py-5">
    <button (click)="changeLang('en-US')" style="margin-left:5px">EN</button>
    <button (click)="changeLang('de-DE')" style="margin-left:5px">DE</button>
    <button (click)="changeLang('pt-BR')" style="margin-left:5px">BR</button>
  </div>
</div>
<ejs-gantt #gantt height="430px"  [dataSource]="data"
        [taskFields]="taskSettings"  [splitterSettings] = "splitterSettings">    
        <e-columns>
          <e-column field="TaskID" headerText="TaskID" width="120" textAlign="Right"></e-column>
          <e-column field="TaskName" headerText="TaskName" width="120" textAlign="Right">
          </e-column>
          <e-column field="lineId" headerText="{{ 'Line' | translate }}" width="120">
          </e-column>
          <e-column field="start" headerText="{{ 'Start' | translate }}" width="140">
          </e-column>
          <e-column field="destination" headerText="{{ 'Destination' | translate }}" width="170"> </e-column>
        </e-columns>
</ejs-gantt>

Step 4: Then add the json file with the translation text in the required languages,

en-US.json { 
    "changeLanguage": "Change Language",
    "Line": "Line",
    "Start": "Start",
    "Destination": "Destination"
}

de-DE.json { 
    "changeLanguage": "Ändere Sprache",
    "Line": "Linie",
    "Start": "Startpunkt",
    "Destination": "Zielpunkt"
}

pt-BR.json { 
    "changeLanguage": "Change Language",
    "Line": "ligne",
    "Start": "debut",
    "Destination": "destination"
}

Through header template

To translate the header text of the Gantt chart’s columns using ngx-translate through header template, you can use the translate pipe in the header templates of the Gantt component.

Here are the steps to use ngx-translate pipe for Gantt’s header template in Angular Gantt chart component:

Step 1: Create and Configure the TranslateService

import { Component, ViewChild } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  constructor(public translate: TranslateService) { }

  changeLang(lang: string) {
    this.translate.use(lang);

    setTimeout(
      function (this: GanttComponent) {
        this.refresh();
      }.bind(this.gantt),
      800
    );
  }

  @ViewChild(GanttComponent, { static: true })
  public gantt!: GanttComponent;
  public flag: boolean = true;
  public data: Object[] = [];

  public taskSettings?: object;
  public splitterSettings?: object;
  ngOnInit(): void {
    this.data = [
      {
        TaskID: 1,
        TaskName: 'Identify Site location',
        StartDate: new Date('04/02/2019'),
        lineId: 5,
        start: 'Reims',
        destination: 'France',
        Duration: 4,
        Progress: 50
      },
      {
        TaskID: 2,
        TaskName: 'Perform Soil test',
        lineId: 6,
        start: 'Münster',
        destination: 'Germany',
        StartDate: new Date('04/02/2019'),
        Duration: 4,
        Progress: 50
      },
      {
        TaskID: 3, TaskName: 'Soil test approval',
        lineId: 2,
        start: 'Rio de Janeiro',
        destination: 'Brazil',
        StartDate: new Date('04/02/2019'),
        Duration: 4,
        Progress: 50
      }
    ];
    this.taskSettings = {
      id: 'TaskID',
      name: 'TaskName',
      startDate: 'StartDate',
      duration: 'Duration',
      progress: 'Progress',
      lineID: 'lineID',
      start: 'start',
      destination: 'destination'
    };
    this.splitterSettings = {
      position: '75%'
    };
  }
}

Step 2: Import the required modules in app.module.ts file along with translate loader function,

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClient, HttpClientModule } from '@angular/common/http';
import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';
import { AppComponent } from './app.component';
import { GridAllModule } from '@syncfusion/ej2-angular-grids';
import { CommonModule } from '@angular/common';
import { ButtonModule } from '@syncfusion/ej2-angular-buttons';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { GanttAllModule } from '@syncfusion/ej2-angular-gantt';

export function createTranslateLoader(http: HttpClient) {
  return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}

@NgModule({
  declarations: [AppComponent],
  imports: [
    HttpClientModule,
    BrowserModule,
    GridAllModule,
    GanttModule,
    CommonModule,
    GanttAllModule,
    ButtonModule,
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: (createTranslateLoader),
        deps: [HttpClient],
      },
      defaultLanguage: '',
    }),  
  ],
  
  bootstrap: [AppComponent],
})
export class AppModule {}

Step 3: Use the ngx-translate pipe in your Angular Gantt chart component header templates to translate the headers dynamically.

<h1> Ngx translate pipe for header template in Angular Gantt component</h1>
<h1></h1>
<div class="container-fluid py-3">
  <div class="btn-group btn-group-sm py-5">
    <button (click)="changeLang('en-US')" style="margin-left:5px">EN</button>
    <button (click)="changeLang('de-DE')" style="margin-left:5px">DE</button>
    <button (click)="changeLang('pt-BR')" style="margin-left:5px">BR</button>
  </div>
</div>
<div style="padding:20px 0px 0px 0px">
  <ejs-gantt #gantt height="430px" [dataSource]="data" [taskFields]="taskSettings" [splitterSettings]="splitterSettings">
  <e-columns>
    <e-column field="TaskID" headerText="TaskID" width="120" textAlign="Right"></e-column>
    <e-column field="TaskName" headerText="TaskName" width="120" textAlign="Right"></e-column>
    <e-column field='lineId' headerText='Line' width=90>
      <ng-template #headerTemplate let-data>
        <div>
          {{ 'Line' | translate }}
        </div>
      </ng-template>
    </e-column>
    <e-column field='start' headerText='Start' width=120>
      <ng-template #headerTemplate let-data>
        <div>
          {{ 'Start' | translate }}
        </div>
      </ng-template>
    </e-column>
    <e-column field='destination' headerText='Destination' width=80>
      <ng-template #headerTemplate let-data>
        <div>
          {{ 'Destination' | translate }}
        </div>
      </ng-template>
    </e-column>
  </e-columns>
</ejs-gantt>
<div>

Step 4: Then add the json file with the translation text in the required languages,

en-US.json { 
    "changeLanguage": "Change Language",
    "Line": "Line",
    "Start": "Start",
    "Destination": "Destination"
}

de-DE.json { 
    "changeLanguage": "Ändere Sprache",
    "Line": "Linie",
    "Start": "Startpunkt",
    "Destination": "Zielpunkt"
}

pt-BR.json { 
    "changeLanguage": "Change Language",
    "Line": "ligne",
    "Start": "debut",
    "Destination": "destination"
}

Custom tooltips for headers provide additional information when hovering over a column header in the Syncfusion^® Gantt chart. This can be useful in situations where there is not enough space to display all of the information related to a column, or when there is additional context that may be helpful.

To enable custom tooltips for headers, you can use the beforeRender event of the Tooltip component. This event is triggered for each header cell before it is rendered, allowing you to add a custom tooltip to the header cell using tooltip component.

Here’s an example of how to use the beforeRender event to add a custom tooltip to a header cell:

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { TooltipAllModule } from "@syncfusion/ej2-angular-popups";

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttData } from './data';
import { TooltipComponent, TooltipEventArgs } from "@syncfusion/ej2-angular-popups";

@Component({
    imports: [
         GanttModule, TooltipAllModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<div class="control-section" >
            <ejs-tooltip #tooltip (beforeRender)="beforeRender($event)" target=".e-headertext">
                <ejs-gantt id="ganttDefault" #tooltip height="430px"  [dataSource]="data" 
                [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">     
                <e-columns>
                    <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                    <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                    <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                    <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                    <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
                    </e-columns>
                </ejs-gantt>
            </ejs-tooltip>
        </div>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('tooltip')
    public toolTip?: TooltipComponent;
    public columnDescriptions: { [key: string]: string } = {
        "Task ID": "A unique id for the task.",
        "Task Name": "The name of the task.",
        "Start Date": "The starting date of the task.",
        "Duration": "The total duration of the task.",
        "Progress": "The current tasks progress.",
    };
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    beforeRender(args: TooltipEventArgs) {
        const description = this.columnDescriptions[args.target.innerText];
        if (description) {
            (this.toolTip as TooltipComponent).content = args.target.innerText + ": " + description;
        }
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The headerCellInfo event can also be used to customize the header tooltip. This event is triggered for each header cell after it is rendered.

Customize header text styles

Customizing the gantt header styles allows you to modify the appearance of the column header in the Gantt control to meet your design requirements. You can customize the font, background color, and other styles of the header cells. To customize the header styles in the gantt, you can use CSS, properties, methods, or event support provided by the Syncfusion^® Angular Gantt chart component.

Using CSS

You can apply styles to the header cells using CSS selectors. The Gantt provides a class name for each header cell element, which you can use to apply styles to that specific header cell. The .e-headercell class can be used to change the background color and text color of the column header.

  .e-gantt .e-headercell {
    background-color: #a2d6f4;
    color:rgb(3, 2, 2);
  }

Here’s an example that demonstrates how to customize the appearance of a specific column header in the Gantt chart using className.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { Gantt } from '@syncfusion/ej2-gantt';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">                
        <e-columns>
            <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
            <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
            <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
            <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
            <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
        </e-columns>
       </ejs-gantt>`,
    styleUrls: ['./app.component.css'],
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Using property

You can customize the appearance of the column headers in Gantt chart using the customAttributes property. The customAttributes property takes an object with the name-value pair to customize the CSS properties for gantt header cells. You can also set multiple CSS properties to the custom class using the customAttributes property.

To customize the header of a column, you can follow the steps below:

Step 1: Define a CSS class that specifies the styles you want to apply to the header cell of the column. For example, to change the background color and text color of the header cell, define a CSS class like this:

    .e-gantt .e-headercell.customcss {
       background-color: rgb(43, 205, 226);
      color: black;
    }

Step 2: Set the customAttributes property of the desired column to an object that contains the CSS class customcss. This CSS class will be applied to the header cell of the specified column in the Gantt.

  <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290 [customAttributes]="{class:'customcss'}"></e-column>

The following example demonstrates how to customize the appearance of the TaskName and Duration columns using custom attributes.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { Gantt } from '@syncfusion/ej2-gantt';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings">    
            <e-columns>
                <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290 [customAttributes]="{class:'customcss'}"></e-column>
                <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 [customAttributes]="{class:'customcss'}"></e-column>
                <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
            </e-columns>
       </ejs-gantt>`,
    styleUrls: ['./app.component.css'],
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Using method

The Syncfusion^® Gantt provides methods in treegrid object in gantt instance to customize the appearance of the gantt chart columns header.

getColumnHeaderByIndex: The method is used to customize the appearance of a specific column header in the grid by specifying the index of the column for which you want to customize the header.
getColumnHeaderByField: This method is used to retrieve the header element of a specific column by its field name. You can use the retrieved element to customize the appearance of the header element.
getColumnHeaderByUid: This method is used to retrieve the header element of a specific column by its unique ID. You can use the retrieved element to customize the appearance of the header element.
getColumnIndexByField:This method is used to retrieve the index of a specific column by its field name. You can use the retrieved index to access the header element and customize its appearance.
getColumnIndexByUid: This method is used to retrieve the index of a specific column by its unique ID. You can use the retrieved index to access the header element and customize its appearance.

Here’s an example of how to use these methods to change the style of a specific column header:

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { Gantt } from '@syncfusion/ej2-gantt';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings" (dataBound)="dataBound()" >  
            <e-columns>
                <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
            </e-columns>
       </ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    dataBound() {
        ((this.gantt as Gantt).treeGrid.getColumnHeaderByIndex(0) as HTMLElement).style.color = '#0d0b0b';
        ((this.gantt as Gantt).treeGrid.getColumnHeaderByField('TaskName') as HTMLElement).style.backgroundColor = '#f45ddeab';
        ((this.gantt as Gantt).treeGrid.getColumnHeaderByField('TaskName') as HTMLElement).style.color = '#0d0b0b';
        ((this.gantt as Gantt).treeGrid.getColumnHeaderByUid('grid-column11') as HTMLElement).style.background = '#f45ddeab';
        const columnIndex = (this.gantt as Gantt).treeGrid.getColumnIndexByField('Duration');
        ((this.gantt as Gantt).treeGrid.getColumnHeaderByIndex(columnIndex) as HTMLElement).style.color = '#0d0b0b';
        const index = (this.gantt as Gantt).treeGrid.getColumnIndexByUid('grid-column11');
        ((this.gantt as Gantt).treeGrid.getColumnHeaderByIndex(index) as HTMLElement).style.color = '#0d0b0b';
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The UID is automatically generated by the Gantt chart component and may change whenever the gantt chart is refreshed or updated.

Using event

To customize the appearance of the gantt chart header, you can handle the headerCellInfo event of the gantt chart. This event is triggered when each header cell is rendered in the gantt, and provides an object that contains information about the header cell. You can use this object to modify the styles of the header column.

The following example demonstrates how to add a headerCellInfo event handler to the gantt chart. In the event handler, checked whether the current header column is TaskID field and then applied the appropriate CSS class to the cell based on its value.

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { HeaderCellInfoEventArgs } from '@syncfusion/ej2-grids';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data"
        [taskFields]="taskSettings" [treeColumnIndex]='1' [splitterSettings] = "splitterSettings" (headerCellInfo)="onHeaderCellInfo($event)">        
            <e-columns>
                <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
            </e-columns>
       </ejs-gantt>`,
    styles: [`
            .e-gantt .e-headercell.customcss {
            background-color: #a2d6f4;
            color:rgb(3, 2, 2);
        }`],
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public onHeaderCellInfo(args: HeaderCellInfoEventArgs) {
        if ((args.cell! as any).column.field == 'TaskID') {
            (args.node as Element).classList.add('customcss');
        }
    }
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

How to refresh header

The refresh header feature in the Syncfusion^® Angular Gantt chart allows you to update the header section of the gantt whenever changes are made to the gantt chart’s columns. This feature is useful when you want to reflect changes in the header immediately, such as modifying the column header text, width, or alignment.

To use the refresh header feature, you can call the refreshHeader method of treegrid object in gantt instance. This method updates the gantt chart header with the latest changes made to the columns.

The following example demonstrates how to use the refreshHeader method to update the gantt header:

app.component.ts
main.ts
import { BrowserModule } from '@angular/platform-browser';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { ButtonModule } from "@syncfusion/ej2-angular-buttons";

import { Component, ViewEncapsulation, ViewChild, OnInit, NgModule } from '@angular/core';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { GanttData } from './data';

@Component({
    imports: [
         GanttModule, ButtonModule
    ],
standalone: true,
    selector: 'app-root',
    template:
        `<button ejs-button (click)="refreshHeader()">Refresh Header</button>
        <ejs-gantt id="ganttDefault" #gantt height="430px"  [dataSource]="data" 
        [taskFields]="taskSettings" [treeColumnIndex]='1'  [splitterSettings] = "splitterSettings" >   
            <e-columns>
                <e-column field='TaskID' headerText='Task ID' textAlign='Right' width=90 ></e-column>
                <e-column field='TaskName' headerText='Task Name' textAlign='Left' width=290></e-column>
                <e-column field='StartDate' headerText='Start Date' textAlign='Right' width=120 ></e-column>
                <e-column field='Duration' headerText='Duration' textAlign='Right' width=90 ></e-column>
                <e-column field='Progress' headerText='Progress' textAlign='Right' width=120></e-column>
            </e-columns>
       </ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent {
    // Data for Gantt
    public data?: object[];
    @ViewChild('gantt')
    public gantt?: GanttComponent;
    public taskSettings?: object;
    public splitterSettings?: object;
    public ngOnInit(): void {
        this.data = GanttData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        };
        this.splitterSettings = {
            position: '75%'
        };
    }
    public refreshHeader(): void {
        const column = (this.gantt as GanttComponent).treeGrid.grid.getColumnByIndex(1);
        column.headerText = 'New Header Text'; // update the header text of the column object
        (this.gantt as GanttComponent).treeGrid.refreshHeader(); // refresh the gantt header
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The refreshHeader method updates only the gantt header and not the entire gantt chart.

How to get header element

To get the header element in a Syncfusion^® Gantt chart, you can use one of the following methods of treegrid object in gantt instance:

getHeaderContent: This method returns the header div element of the Gantt. You can use this method to access the entire header content of the Gantt.
```
 const headerElement = this.gantt.treeGrid.getHeaderContent();
```
getHeaderTable: This method returns the header table element of the Gantt. You can use this method to access only the header table of the Gantt.
```
 const headerTableElement = this.gantt.treeGrid.getHeaderTable();
```
getColumnHeaderByUid: This method returns the column header element by its unique identifier.
```
 const columnHeaderElement = this.gantt.treeGrid.getColumnHeaderByUid("e-grid2");
```
getColumnHeaderByIndex: This method returns the column header element by its index.
```
 const columnHeaderElement = this.gantt.treeGrid.getColumnHeaderByIndex(0);
```
getColumnHeaderByField: This method returns the column header element by its field name.
```
 const columnHeaderElement = this.gantt.treeGrid.getColumnHeaderByField("TaskID");
```

The UID is automatically generated by the Gantt chart component and may change whenever the gantt is refreshed or updated.