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Critical Path in JavaScript Gantt control

08 Aug 2022 / 2 minutes to read

The critical path in a project is indicated by a single task or a series of tasks. If a task in critical path is delayed, the entire project will be delayed. A task is considered to be critical if any delay to this task would affect the project end date.

The critical path can be enabled in Gantt by using the built-in toolbar button or enableCriticalPath property.

The following code example shows how to display the critical path in the Gantt control:

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

Gantt.Inject(CriticalPath, Toolbar, Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks',
    },
    enableCriticalPath: true,
    editSettings: {
        allowAdding: true,
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    toolbar: ['CriticalPath'],
});
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/ej2/20.2.43/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 .e-gantt-chart .e-custom-holiday {
           background-color:#e82869;
        }
    </style>
</head>

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

</html>

Customize taskbar in critical path

The taskbar in critical path can be customized by using queryTaskbarInfo event and isCritical property of row data in the event argument.

The following code example shows how to customize the critical path taskbar in the Gantt control:

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

Gantt.Inject(CriticalPath, Toolbar, Edit);

let gantt: Gantt = new Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks',
    },
    enableCriticalPath: true,
    editSettings: {
        allowAdding: true,
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    toolbar: ['CriticalPath'],
    queryTaskbarInfo(args: any) {
        if (args.data.isCritical && !args.data.hasChildRecords) {
            args.taskbarBgColor = 'rgb(242, 210, 189)';
            args.progressBarBgColor = 'rgb(201, 169, 166)';
        }
    }
});
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/ej2/20.2.43/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 .e-gantt-chart .e-custom-holiday {
           background-color:#e82869;
        }
    </style>
</head>

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

</html>