Managing tasks in EJ2 JavaScript Gantt control

18 Apr 202524 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.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Edit);

var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		editSettings: {
           allowEditing: true,
		   mode:'Dialog'
         }
     });
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Toolbar);

function durationFormat(field, data, column) {
    return data[field];
}
var ganttChart = new ej.gantt.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' },
        { 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 }  }},
    ],
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.js
index.html
var elem;
var dropdownlistObj;
var ganttChart = new ej.gantt.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: function() {
                    elem = document.createElement('input');
                    return elem;
                },
                read: function() {
                   return dropdownlistObj.value;
                },
                destroy: function() {
                    dropdownlistObj.destroy();
                },
                write: function(args) {
                    dropdownlistObj = new ej.dropdowns.DropDownList({
                        dataSource: ganttChart.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' },
    ],
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.js
index.html
var ganttChart = new ej.gantt.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'  },
    ],
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Edit,ej.gantt.Toolbar);

var ganttChart = new ej.gantt.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
     });
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    

    <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/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
			duration: 'Duration',
            progress: 'Progress',
			child: 'subtasks'
        },
		editSettings:{
			allowAdding:true
		},
        actionBegin : function (args) {
            if (args.requestType == 'beforeOpenAddDialog') {
                args.rowData.TaskName = 'Gantt';
                args.rowData.Progress = 70;
                args.rowData.ganttProperties.taskName = 'Gantt';
                args.rowData.ganttProperties.progress = 70;
            }
        },
		toolbar: ['Add']
		
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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

The form element in the General tab of the add/edit dialog can be added or removed by using the fields property within the addDialogFields and editDialogFields settings respectively.

The controls of the fields can be customized by using the edit template feature.

In the below sample, General tab is customized using the fields property. The fields TaskID, TaskName and newInput are added in both addDialogFields and editDialogFields settings.

index.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    resources: resourceCollection,
    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"}
    ],
    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'],
		
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Customize dependency, segments and resources tab of dialog

You can customize the dependency, segments, and resource tabs of the dialog box using the additionalParams property within the addDialogFields and editDialogFields settings respectively. This customization involves defining properties from the Grid within the additionalParams property.

In the example below:

The dependency tab enables sorting and toolbar options.
The segments tab enables sorting and toolbar options and includes a new column newData defined with a specified field.
The resources tab defines a new column Segment Task with specific properties such as field, width and headerText.
These customizations are applied to both addDialogFields and editDialogFields settings.

index.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
			duration: 'Duration',
            progress: 'Progress',
			child: 'subtasks'
        },
		editSettings:{
			allowAdding:true
		},
        actionBegin : function (args) {
            if (args.requestType == 'beforeOpenAddDialog') {
                args.rowData.TaskName = 'Gantt';
                args.rowData.Progress = 70;
                args.rowData.ganttProperties.taskName = 'Gantt';
                args.rowData.ganttProperties.progress = 70;
            }
        },
		toolbar: ['Add']
		
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Customize note dialog tab

You can customize the note dialog tab using the additionalParams property within the addDialogFields and editDialogFields settings respectively. This customization involves defining properties from the RTE module within the additionalParams property.

In the following example, the notes tab is customized with the inlinemode property enabled, allowing for in-place editing. Additionally, the OnSelection property is enabled, which opens the toolbar inline upon selecting text.

index.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    resources: resourceCollection,
    addDialogFields: [
        { type: 'General', headerText: 'General add',fields:["newinput"]},
        { type: 'Dependency', additionalParams: {allowPaging: true, allowSorting: true, toolbar: ["Search", "Print",]}},
        { type: 'Resources'} , 
        { type: 'Notes' },
        {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: 'Notes', additionalParams: {inlineMode: { enable: true,onSelection: true }}},
        {type: "Segments", additionalParams: {columns: [{ field: "segmenttask", width: "170px", headerText: "Segment Task" }],}}
    ],
    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'],
		
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.

Alt text
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.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Edit);

var ganttData = [
            {
                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 }
                ]
            },
        ];
	
var ganttChart = new ej.gantt.Gantt({
         dataSource: ganttData,
		 height:'450px',
		 taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
			dependency: 'Predecessor',
            child: 'subtasks'
        },
		editSettings: {
           allowTaskbarEditing:true
         },
         load: function() {
            this.isAdaptive = true;
        }
     });
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></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>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.js
index.html
ej.gantt.Gantt.Inject(ej.gantt.Edit);
var ganttChart = new ej.gantt.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'
	    }
});
ganttChart.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/ej2/29.2.4/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/29.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></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="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>