Maintain zoom to fit in Angular Gantt component

28 Sep 20238 minutes to read

In the Gantt control, While performing edit actions or dynamically change dataSource, the timeline gets refreshed. When zoomToFit toolbar item is clicked and perform editing actions or dynamically change dataSource, the timeline gets refreshed. So that, the timeline will not fit to the project any more.

Maintain zoomToFit after edit actions

We can maintain zoomToFit after editing actions(cell edit,dialog edit,taskbar edit) by using fitToProject method in actionComplete and taskbarEdited event.

app.component.ts

import { Component, ViewEncapsulation, OnInit, ViewChild} from '@angular/core';
import { Gantt } from '@syncfusion/ej2-gantt';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { ToolbarItem, ZoomTimelineSettings, EditSettingsModel  } from '@syncfusion/ej2-angular-gantt';
import { projectNewData } from './data';

@Component({
    selector: 'app-root',
    template:
       `<ejs-gantt #gantt id="ganttDefault" height="430px" [dataSource]="data" [taskFields]="taskSettings"[toolbar]="toolbar" [editSettings]="editSettings" (actionComplete)="actionComplete($event)" (taskbarEdited)="taskbarEdited($event)"></ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent{
    // Data for Gantt
    public data?: object[];
    public taskSettings?: object;
    public toolbar?: ToolbarItem[];
    public editSettings?: EditSettingsModel;
    @ViewChild('gantt', {static: true})
    public ganttObj?: GanttComponent| any;
    public ngOnInit(): void {
        this.data = projectNewData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            endDate: 'EndDate',
            duration: 'Duration',
            progress: 'Progress',
            dependency: 'Predecessor',
            child: 'subtasks'
        };
        this.editSettings = {
            allowEditing: true,
            allowTaskbarEditing: true,
        };
        this.toolbar =  ['Edit','ZoomToFit'];
    }
    public actionComplete(args: any) {
      if ((args.action === "CellEditing" || args.action === "DialogEditing") && args.requestType === "save") {
        this.ganttObj.dataSource = projectNewData;
        this.ganttObj.fitToProject();
      }
    };
    public taskbarEdited(args: any) {
      if (args) {
        this.ganttObj.dataSource = projectNewData;
        this.ganttObj.fitToProject();
      }
    };
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { EditService, SelectionService, ToolbarService } from '@syncfusion/ej2-angular-gantt';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, GanttModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [EditService, SelectionService, ToolbarService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Maintain zoomToFit after change dataSource dynamically

We can maintain zoomToFit after change dataSource dynamically, by calling fitToProject method in dataBound event.

app.component.ts

import { Component, ViewEncapsulation, OnInit,  ViewChild } from '@angular/core';
import { Gantt } from '@syncfusion/ej2-gantt';
import { GanttComponent } from '@syncfusion/ej2-angular-gantt';
import { ToolbarItem, ZoomTimelineSettings  } from '@syncfusion/ej2-angular-gantt';
import { ButtonComponent } from '@syncfusion/ej2-angular-buttons';
import { projectNewData, data } from './data';

@Component({
    selector: 'app-root',
    template:
       `<button ejs-button id='changeData' (click)='changeData()'>Change Data</button>
       <br><br>
       <ejs-gantt #gantt id="ganttDefault" height="430px" [dataSource]="data" [taskFields]="taskSettings"[toolbar]="toolbar" (dataBound)="dataBound($event)"></ejs-gantt>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent{
    // Data for Gantt
    public data?: object[];
    public taskSettings?: object;
    public toolbar?: ToolbarItem[];
    @ViewChild('gantt', {static: true})
    public ganttObj?: GanttComponent| any;
    public ngOnInit(): void {
        this.data = projectNewData;
        this.taskSettings = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            endDate: 'EndDate',
            duration: 'Duration',
            progress: 'Progress',
            dependency: 'Predecessor',
            child: 'subtasks'
        };
        this.toolbar =  ['ZoomToFit'];
    }
    public dataBound(args: any) {
      this.ganttObj.fitToProject();
    };
    changeData(): void {
      this.ganttObj.dataSource = data;
    };
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { GanttModule } from '@syncfusion/ej2-angular-gantt';
import { ToolbarService } from '@syncfusion/ej2-angular-gantt';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, GanttModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ToolbarService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);