Managing tasks in EJ2 TypeScript Gantt control

15 Mar 202424 minutes to read

The Gantt component has options to dynamically insert, delete, and update tasks in the project. The primary key column is necessary to manage the tasks and perform CRUD operations in Gantt. To define the primary key, set the columns.isPrimaryKey property to true in the particular column.

To use CRUD, inject the Edit module into the Gantt control.

index.ts
index.html
import { Gantt, Edit } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks',
    },
    editSettings: {
        allowEditing: true,
        allowAdding: true,
        allowTaskbarEditing: true,
    }
});

gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Cell edit type and its params

The columns.editType is used to define the edit type for any particular column.
You can set the columns.editType based on data type of the column.

numericedit - NumericTextBox component for integers, double, and decimal data types.
defaultedit - TextBox component for string data type.
dropdownedit - DropDownList component to show all unique values related to that field.
booleanedit - CheckBox component for boolean data type.
datepickeredit - DatePicker component for date data type.
datetimepickeredit - DateTimePicker component for date time data type.

Also, you can customize the behavior of the editor component through the columns.edit.params.

The following table describes cell edit type component and their corresponding edit params of the column.

Edit Type	Component	Example
`numericedit`	`NumericTextBox`	params: { decimals: 2, value: 5 }
`dropdownedit`	`DropDownList`	params: { value: ‘Germany’ }
`booleanedit`	`Checkbox`	params: { checked: true}
`datepickeredit`	`DatePicker`	params: { format:’dd.MM.yyyy’ }
`datetimepickeredit`	`DateTimePicker`	params: { value: new Date() }

index.ts
index.html
import { Gantt, Edit } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Edit);
function durationFormat(field: string, data: Object, column: Object): string {
    return data[field];
}
let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
    editSettings: {
        allowEditing: true
    },
    toolbar: ['Edit'],
    columns: [
        { field: 'TaskID', headerText: 'Task ID' },
        { field: 'TaskName', headerText: 'Task Name' },
        { field: 'StartDate', headerText: 'Start Date'  },
        { field: 'Duration', headerText: 'Duration', editType:'numericedit', edit: { params: { min:1 } }, valueAccessor: durationFormat },
        { field: 'Progress', headerText: 'Progress', edit: { params: { showSpinButton: false }  } },
    ],
});

gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Cell Edit Template

The cell edit template is used to create a custom component for a particular column by invoking the following functions:

create - It is used to create the element at the time of initialization.
write - It is used to create the custom component or assign default value at the time of editing.
read - It is used to read the value from the component at the time of save.
destroy - It is used to destroy the component.

index.ts
index.html
import { Gantt, Edit } from '@syncfusion/ej2-gantt';
import { DropDownList } from '@syncfusion/ej2-dropdowns';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Edit);
let elem: HTMLElement;
let dropdownlistObj: DropDownList;

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
    editSettings: {
        allowEditing: true
    },
    columns: [
        { field: 'TaskID', headerText: 'Task ID' },
        {
            field: 'TaskName', headerText: 'Task Name',
            edit: {
                create: () => {
                    elem = document.createElement('input');
                    return elem;
                },
                read: () => {
                   return dropdownlistObj.value;
                },
                destroy: () => {
                    dropdownlistObj.destroy();
                },
                write: (args: Object) => {
                    dropdownlistObj = new DropDownList({
                        dataSource: gantt.treeGrid.grid.dataSource,
                        fields: { value: 'TaskName' },
                        value: args.rowData[args.column.field],
                        floatLabelType: 'Auto',
                    });
                    dropdownlistObj.appendTo(elem);
                }
            }
        },
        { field: 'StartDate', headerText: 'Start Date' },
        { field: 'Duration', headerText: 'Duration' },
        { field: 'Progress', headerText: 'Progress' },
    ],

});

gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Disable editing for particular column

You can disable editing for particular columns, by using the columns.allowEditing property.

In the following demo, editing is disabled for the TaskName column.

index.ts
index.html
import { Gantt, Edit } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
    editSettings: {
        allowEditing: true
    },
    toolbar: ['Edit'],
    columns: [
        { field: 'TaskID', headerText: 'Task ID' },
        { field: 'TaskName', headerText: 'Task Name', allowEditing: false },
        { field: 'StartDate', headerText: 'Start Date', },
        { field: 'Duration', headerText: 'Duration' },
        { field: 'Progress', headerText: 'Progress'  },
    ],
});

gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Read-only Gantt

In Gantt, all create, update, delete operations can be disabled by set readOnly property as true. The following sample demonstrates, render Gantt chart as read only.

index.ts
index.html
import { Gantt, Edit, Toolbar, ContextMenu, Resize, Sort, Selection} from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Edit, Toolbar, ContextMenu, Resize, Sort, Selection);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks',
    },
    toolbar: ['Add', 'Cancel', 'CollapseAll', 'Delete', 'Edit', 'ExpandAll', 'NextTimeSpan', 'PrevTimeSpan', 'Search', 'Update', 'Indent', 'Outdent'],
    enableContextMenu: true,
    editSettings: {
        allowEditing: true,
        allowAdding: true,
        allowDeleting: true,
        allowTaskbarEditing: true
    },
    allowSorting: true,
    allowResizing: true,
    readOnly: true
});

gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>

    <style> 
        .e-gantt-chart .e-preventEdit .e-right-resize-gripper, 
        .e-gantt-chart .e-preventEdit .e-left-resize-gripper, 
        .e-gantt-chart .e-preventEdit .e-progress-resize-gripper, 
        .e-gantt-chart .e-preventEdit .e-left-connectorpoint-outer-div, 
        .e-gantt-chart .e-preventEdit .e-right-connectorpoint-outer-div { 
                         display: none; 
        } 
    </style>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Troubleshoot: Editing works only when primary key column is defined

Editing feature requires a primary key column for CRUD operations. While defining columns in Gantt using the columns property, it is mandatory that any one of the columns, must be a primary column. By default, the id column will be the primary key column. If id column is not defined, we need to enable isPrimaryKey for any one of the columns defined in the columns property.

Open new task dialog with default values

You can set default values when new task dialog opens using actionBegin event when requestType is beforeOpenAddDialog.

index.ts
index.html
import { Gantt, Toolbar, Edit, ActionBeginArgs } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Toolbar, Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
    editSettings: {
        allowAdding: true
    },
    actionBegin : (args: ActionBeginArgs) => {
        if (args.requestType == 'beforeOpenAddDialog') {
            args.rowData.TaskName = 'Gantt';
            args.rowData.Progress = 70;
            args.rowData.ganttProperties.taskName = 'Gantt';
            args.rowData.ganttProperties.progress = 70;
        }
    },
    toolbar: ['Add']
});
gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Customize control in add/edit dialog

In Gantt Chart, the controls such as form elements, grid and RTE in add and edit dialog can be customized by using additionalParams property.

Customize general tab of dialog

In the general tab of add/edit dialog, the custom input fields can be included into fields by defining the field names either from the data source or template in addDialogFields and editDialogFields respectively.

In the below sample, added field from the template to general tab.

index.ts
index.html
import { Gantt, Toolbar, Edit} from '@syncfusion/ej2-gantt';
import { GanttData,resourceCollection } from 'datasource.ts';

Gantt.Inject(Toolbar, Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    resources: resourceCollection,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        dependency: 'Predecessor',
        resourceInfo: 'resources',
        work: 'work',
        child: 'subtasks',
        segments: 'Segments',
        notes:"note",
    },
    editSettings: {
        allowAdding: true,
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    toolbar: ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll'],
    addDialogFields: [
        { type: 'General', headerText: 'General add',fields: ["TaskID", "TaskName", "newInput"] },
        { type: 'Dependency'},
        { type: 'Resources'} , 
        { type: 'Notes' },
        {type:"Segments"}
    ],
    editDialogFields: [
        { type: 'General', headerText: 'General edit', fields: ["TaskID", "TaskName", "newInput"] },
        {type: 'Dependency', },
        { type: 'Resources'},
        {type: 'Notes'},
        {type: "Segments"}
    ],
});
gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <script type="text/x-jsrender" id="newInput">
        <div class="e-edit-form-column">
             <input type="text" class="inputbox" placeholder="custom input 1">
            </div>
         </script>  
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Customize dependency, segments and resources tab of dialog

Grid component in the dependency, segment and resource tab of add/edit dialog can be customized, by defining grid module properties in the additionalParams property of addDialogFields and editDialogFields.

In the below code show cases, how to add additional features to dependency, segments and resources tab.

index.ts
index.html
import { Gantt, Toolbar, Edit} from '@syncfusion/ej2-gantt';
import { GanttData,resourceCollection } from 'datasource.ts';

Gantt.Inject(Toolbar, Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    resources: resourceCollection,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        dependency: 'Predecessor',
        resourceInfo: 'resources',
        work: 'work',
        child: 'subtasks',
        segments: 'Segments',
        notes:"note",
    },
    editSettings: {
        allowAdding: true,
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    toolbar: ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll'],
    addDialogFields: [
        { type: 'General', headerText: 'General add'},
        { type: 'Dependency', additionalParams: {allowPaging: true, allowSorting: true, toolbar: ["Search", "Print",]}},
        { type: 'Resources', additionalParams: { allowSorting: true, allowPaging: true, toolbar: ["Search", "Print"], columns: [{ field: "newData" }]}},
        {type:"Segments", additionalParams:{columns:[{field:"segmenttask",width:"170px" ,headerText:"Segment Task"}],}}
    ],
    editDialogFields: [
        { type: 'General', headerText: 'General edit', fields: ["TaskID", "TaskName", "newinput"] },
        {type: 'Dependency', additionalParams: {allowPaging: true, allowSorting: true, toolbar: ["Search", "Print",]}},
        { type: 'Resources', additionalParams: { allowSorting: true, allowPaging: true, toolbar: ["Search", "Print"], columns: [{ field: "newdata" }]}},
        {type: "Segments", additionalParams: {columns: [{ field: "segmenttask", width: "170px", headerText: "Segment Task" }],}}
    ],
});
gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <script type="text/x-jsrender" id="newinput">
        <div class="e-edit-form-column">
             <input type="text" class="inputbox" placeholder="custom input 1">
            </div>
         </script>  
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Customize note dialog tab

RTE component in notes tab of add and edit dialog can be customized, by defining RTE module properties in the additionalParams property of addDialogFields and editDialogFields.

The below code shows how to enable inline mode to RTE in notes tab.

index.ts
index.html
import { Gantt, Toolbar, Edit} from '@syncfusion/ej2-gantt';
import { GanttData,resourceCollection } from 'datasource.ts';

Gantt.Inject(Toolbar, Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    resources: resourceCollection,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        dependency: 'Predecessor',
        resourceInfo: 'resources',
        work: 'work',
        child: 'subtasks',
        segments: 'Segments',
        notes:"note",
    },
    editSettings: {
        allowAdding: true,
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    toolbar: ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll'],
    addDialogFields: [
        { type: 'General', headerText: 'General add'},
        { type: 'Dependency'},
        { type: 'Resources'} , 
        {type: 'Notes', additionalParams: {inlineMode: { enable: true,onSelection: true }}},
        {type:"Segments"}
    ],
    editDialogFields: [
        { type: 'General', headerText: 'General edit' },
        {type: 'Dependency'},
        { type: 'Resources'},
        {type: 'Notes', additionalParams: {inlineMode: { enable: true,onSelection: true }}},
        {type: "Segments"}
    ],
});
gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <script type="text/x-jsrender" id="newinput">
        <div class="e-edit-form-column">
             <input type="text" class="inputbox" placeholder="custom input 1">
            </div>
         </script>  
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Touch interaction

The Gantt control editing actions can be achieved using the double tap and tap and drag actions on a element.

The following table describes different types of editing modes available in Gantt.

Action	Description
`Cell editing`	To perform `double tap` on a specific cell, initiate the cell to be in edit state.
`Dialog editing`	To perform `double tap` on a specific row, initiate the edit dialog to be opened.
`Taskbar editing`	Taskbar editing action is initiated using the `tap` action on the taskbar. Parent taskbar : Once you tap on the parent taskbar, it will be changed to editing state. Perform only dragging action on parent taskbar editing. Child taskbar : Once you tap the child taskbar, it will be changed to editing state. Dragging taskbar : To drag a taskbar to the left or right in editing state. Resizing taskbar : To resize a taskbar, drag the left/right resize icon. Progress resizing : To change the progress, drag the progress resize icon to the left or right direction.

Task dependency editing

You can tap the left/right connector point to initiate task dependencies edit mode and again tap another taskbar to establish the dependency line between two taskbars.

The following table explains the taskbar state in dependency edit mode.

Taskbar states

Taskbar state	Description
`Parent taskbar`	You cannot create dependency relationship to parent tasks.
`Taskbar without dependency`	If you tap a valid child taskbar, it will create `FS` type dependency line between tasks, otherwise exits from task dependency edit mode.
`Taskbar with dependency`	If you tap the second taskbar, which has already been directly connected, it will ask to remove it.
`Removing dependency`	Once you tap the taskbar with direct dependency, then confirmation dialog will be shown for removing dependency.

index.ts
index.html
import { Gantt, Edit, Selection } from '@syncfusion/ej2-gantt';

Gantt.Inject(Edit, Selection);

let gantt: Gantt = new Gantt({
        dataSource: [
            {
                TaskID: 1,
                TaskName: 'Project Initiation',
                StartDate: new Date('04/02/2019'),
                EndDate: new Date('04/21/2019'),
                subtasks: [
                    { TaskID: 2, TaskName: 'Identify Site location', StartDate: new Date('04/02/2019'), Duration: 3, Progress: 50 },
                    { TaskID: 3, TaskName: 'Perform Soil test', StartDate: new Date('04/02/2019'), Duration: 4, Progress: 50  },
                    { TaskID: 4, TaskName: 'Soil test approval', StartDate: new Date('04/02/2019'), Duration: 4,Predecessor:"2FS", Progress: 50 },
                ]
            },
            {
                TaskID: 5,
                TaskName: 'Project Estimation',
                StartDate: new Date('04/02/2019'),
                EndDate: new Date('04/21/2019'),
                subtasks: [
                    { TaskID: 6, TaskName: 'Develop floor plan for estimation', StartDate: new Date('04/04/2019'), Duration: 3, Progress: 50 },
                    { TaskID: 7, TaskName: 'List materials', StartDate: new Date('04/04/2019'), Duration: 3, Progress: 50 },
                    { TaskID: 8, TaskName: 'Estimation approval', StartDate: new Date('04/04/2019'), Duration: 4,Predecessor:"6SS", Progress: 50 }
                ]
            },
        ],
        height:'450px',
        taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            dependency: 'Predecessor',
            child: 'subtasks'
        },
        editSettings: {
           allowTaskbarEditing: true
        },
        // Forcing desktop layout to change as mobile layout
        load: function(){
            this.isAdaptive = true;
        }
});

gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
       
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Note: In mobile device, you cannot create dependency other than FS by taskbar editing. By using cell/dialog editing, you can add all type of dependencies.

The taskbar editing tooltip can be customized using the tooltipSettings.editing property. The following code example shows how to customize the taskbar editing tooltip in Gantt.

index.ts
index.html
import { Gantt, Edit } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
    editSettings: {
        allowEditing: true,
        allowTaskbarEditing: true
    },
    tooltipSettings: {
        showTooltip: true,
        editing: '#editingTooltip'
    }
});
gantt.appendTo('#Gantt');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Gantt Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <script type="text/x-jsrender" id="editingTooltip">
        <div>Duration : ${duration}</div>
    </script>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>