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Selection in JavaScript Gantt control

02 Dec 2022 / 4 minutes to read

Selection provides an option to highlight a row or a cell. It can be done using arrow keys or by scrolling down the mouse. To disable selection in the Gantt control, set the allowSelection to false.

To select data, inject the Selection module into the Gantt control.

The Gantt control supports two types of selection that can be set by using the selectionSettings.type property. They are:

  • Single: Sets a single value by default and allows only selection of a single row or a cell.
  • Multiple: Allows you to select multiple rows or cells. To perform the multi-selection, press and hold the CTRL key and click the desired rows or cells.

Selection mode

The Gantt control supports three types of selection modes that can be set by using the selectionSettings.mode. They are:

  • Row: Allows you to select only rows, and the row value is set by default.
  • Cell: Allows you to select only cells.
  • Both: Allows you to select rows and cells at the same time.
Source
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index.ts
index.html
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import { Gantt, Selection } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Selection);

let gantt: Gantt = new Gantt({
dataSource: GanttData,
height: '450px',
taskFields: {
    id: 'TaskID',
    name: 'TaskName',
    startDate: 'StartDate',
    duration: 'Duration',
    progress: 'Progress',
    child: 'subtasks'
},
selectionSettings: {
    mode: 'Both'
}
});
gantt.appendTo('#Gantt');
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<!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/ej2/20.3.56/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>
</head>

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

</html>

Toggle selection

The toggle selection allows you to select and deselect a specific row or cell. To enable toggle selection, set the enableToggle property of the selectionSettings to true. If you click the selected row or cell, then it will be deselected and vice versa. By default, the enableToggle property is set to false.

Source
Preview
index.ts
index.html
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import { Gantt, Selection } from '@syncfusion/ej2-gantt';
import { Button } from '@syncfusion/ej2-buttons';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Selection);

let gantt: Gantt = new Gantt({
dataSource: GanttData,
height: '450px',
taskFields: {
    id: 'TaskID',
    name: 'TaskName',
    startDate: 'StartDate',
    duration: 'Duration',
    progress: 'Progress',
    child: 'subtasks'
},
selectionSettings: {
    mode: 'Row',
    type: 'Multiple',
    enableToggle: true
}
});
gantt.appendTo('#Gantt');

let toggleBtn: Button = new Button();
toggleBtn.appendTo('#toggle');

document.getElementById('toggle').addEventListener('click', () => {
gantt.selectionSettings.enableToggle = false;
});
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<!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/ej2/20.3.56/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>
</head>

<body>
    <button id="toggle">Disable toggle</button>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Clear selection

You can clear the selected cells and selected rows by using a method called clearSelection. The following code example demonstrates how to clear the selected rows in Gantt Chart.

Source
Preview
index.ts
index.html
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import { Gantt, Selection } from '@syncfusion/ej2-gantt';
import { Button } from '@syncfusion/ej2-buttons';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Selection);

let gantt: Gantt = new Gantt({
dataSource: GanttData,
height: '450px',
taskFields: {
    id: 'TaskID',
    name: 'TaskName',
    startDate: 'StartDate',
    duration: 'Duration',
    progress: 'Progress',
    child: 'subtasks'
},
selectionSettings: {
    mode: 'Row',
    type: 'Multiple'
}
});
gantt.appendTo('#Gantt');

let selBtn: Button = new Button();
selBtn.appendTo('#selectRows');

let clrBtn: Button = new Button();
clrBtn.appendTo('#clearSelection');

document.getElementById('selectRows').addEventListener('click', () => {
gantt.selectionModule.selectRows([1, 3, 5]); // passing the record index as array collection
});

document.getElementById('clearSelection').addEventListener('click', () => {
gantt.clearSelection(); // Clear the selected rows
});
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<!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/ej2/20.3.56/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>
</head>

<body>
    <button id="selectRows">Select Rows</button>
    <button id="clearSelection">Clear Selection</button>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='Gantt'></div>        
    </div>
</body>

</html>

Get selected row indexes and records

You can get the selected row indexes by using the getSelectedRowIndexes method. And by using getSelectedRecords method, you can get the selected record details.

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

Gantt.Inject(Selection);

let gantt: Gantt = new Gantt({
dataSource: GanttData,
height: '450px',
taskFields: {
    id: 'TaskID',
    name: 'TaskName',
    startDate: 'StartDate',
    duration: 'Duration',
    progress: 'Progress',
    child: 'subtasks'
},
selectionSettings: {
    mode: 'Row',
    type: 'Multiple'
},
rowSelected: rowSelected
});
gantt.appendTo('#Gantt');

function rowSelected(args: RowSelectEventArgs) {
let selectedrowindex: number[] = gantt.selectionModule.getSelectedRowIndexes();  // get the selected row indexes.
alert(selectedrowindex); // to alert the selected row indexes.
let selectedrecords: Object[] = gantt.selectionModule.getSelectedRecords();  // get the selected records.
console.log(selectedrecords); // to print the selected records in console window.
}
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<!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/ej2/20.3.56/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>
</head>

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

</html>

Multiple Selection based on condition

You can select multiple rows based on condition by using the selectRows method.

In the following code, the rows which contains TaskId value as 3 and 4 are selected at initial rendering.

Source
Preview
index.ts
index.html
Copied to clipboard
import { Gantt, Selection, RowSelectEventArgs } from '@syncfusion/ej2-gantt';
import { GanttData } from 'datasource.ts';

Gantt.Inject(Selection);

let gantt: Gantt = new Gantt({
dataSource: GanttData,
height: '450px',
taskFields: {
    id: 'TaskID',
    name: 'TaskName',
    startDate: 'StartDate',
    duration: 'Duration',
    progress: 'Progress',
    child: 'subtasks'
},
selectionSettings: {
    mode: 'Row',
    type: 'Multiple'
},
dataBound: () => {
    var rowIndexes = [];
    gantt.treeGrid.grid.dataSource.forEach((data,index) => {
        if (data.TaskID === 3 || data.TaskID === 4) {
           rowIndexes.push(index);
        }
        });
    gantt.selectRows(rowIndexes);
},
});
gantt.appendTo('#Gantt');
Copied to clipboard
<!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/ej2/20.3.56/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>
</head>

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

</html>

See Also