Scheduling Tasks in EJ2 JavaScript Gantt Chart Control

2 Feb 202624 minutes to read

Task scheduling in the EJ2 JavaScript Gantt Chart control defines and visualizes task start dates, durations, and end dates as taskbars in a project timeline, enabling precise planning and tracking. Configure scheduling with properties like taskFields for mapping task data, taskMode for auto or manual validation, taskType for fixed unit, work, or duration, and durationUnit for day, hour, or minute units. Working time, set via dayWorkingTime, and non-working periods, like weekends or holidays, ensure realistic calculations. Events like dataBound customize scheduling logic on run-time. Taskbars include ARIA labels for accessibility, describing start, end, and duration, and adapt to responsive designs, though narrow screens may require scrolling for long timelines.

Configure scheduling modes

Scheduling modes control task date validation:

Auto (default): Validates dates based on dependencies, working time, holidays, and weekends. Parent tasks adjust to child tasks’ minimum start and maximum end dates.
Manual: Allows custom dates without automatic validation, editable for parent tasks.
Custom: Renders both auto and manual tasks from the data source.

Configure using:

taskMode: Sets global mode.
taskFields.manual: Sets per-task mode.

Automatically scheduled Tasks

The following example configures auto scheduling:

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

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '420px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID'
    },
    taskMode:"Auto",
    treeColumnIndex: 1,
    toolbar: ['Add',  'Edit', 'Delete', 'Update', 'Cancel', 'CollapseAll',  'ExpandAll', 'Search'],
    editSettings: {
        allowEditing: true,
        allowAdding: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: 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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Manually scheduled Tasks

The following example configures manual scheduling:

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

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '420px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID'
    },
    taskMode:"Manual",
    treeColumnIndex: 1,
    validateManualTasksOnLinking: true,
    toolbar: ['Add',  'Edit', 'Delete', 'Update', 'Cancel', 'CollapseAll', 'ExpandAll', 'Search'],
    editSettings: {
        allowEditing: true,
        allowAdding: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: 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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Custom scheduled

The following example mixes auto and manual tasks:

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

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '420px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID',
        manual: 'isManual'
    },
    taskMode:"Custom", 
    treeColumnIndex: 1,
    validateManualTasksOnLinking: true,
    toolbar: ['Add',  'Edit', 'Delete', 'Update', 'Cancel', 'CollapseAll', 'ExpandAll', 'Search'],
    editSettings: {
        allowEditing: true,
        allowAdding: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    columns: [
        { field: 'TaskID', visible: false },
        { field: 'TaskName' },
        { field: 'isManual' }
    ],
});
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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Configure task types

Task types define how changes to duration, work, or resource units affect other properties:

FixedUnit (default): Adjusts duration when work changes, maintaining unit allocation.
FixedWork: Adjusts duration when units change, maintaining work amount.
FixedDuration: Adjusts units when work changes, maintaining duration.

Configure using:

taskType: Sets global type.
taskFields.type: Sets per-task type.

The following example configures task types:

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

var resources = [
    { resourceId: 1, resourceName: 'Martin Tamer' },
    { resourceId: 2, resourceName: 'Rose Fuller' },
    { resourceId: 3, resourceName: 'Margaret Buchanan' },
    { resourceId: 4, resourceName: 'Fuller King' },
    { resourceId: 5, resourceName: 'Davolio Fuller' },
    { resourceId: 6, resourceName: 'Van Jack' },
    { resourceId: 7, resourceName: 'Fuller Buchanan' },
    { resourceId: 8, resourceName: 'Jack Davolio' },
    { resourceId: 9, resourceName: 'Tamer Vinet' },
    { resourceId: 10, resourceName: 'Vinet Fuller' },
    { resourceId: 11, resourceName: 'Bergs Anton' },
    { resourceId: 12, resourceName: 'Construction Supervisor' }
];

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '450px',
    highlightWeekends: true,
    projectStartDate: new Date('03/25/2019'),
    projectEndDate: new Date('04/30/2019'),
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        dependency: 'Predecessor',
        resourceInfo: 'resources',
        parentID: 'ParentID',
        work: 'Work',
        taskType: 'taskType'
    },
    resources: resources,
    resourceFields: {
        id: 'resourceId',
        name: 'resourceName',
        unit: 'Unit'
    },
    resourceNameMapping: 'resourceName',
    resourceIDMapping: 'resourceId',
    resourceUnitMapping: 'Unit',
    workUnit: 'hour',
    taskType: 'FixedWork', 
    treeColumnIndex: 1,
    toolbar: [
        'Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll'
    ],
    editSettings: {
        allowAdding: true,
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: true
    },
    columns: [
        { field: 'TaskID', visible: false },
        { field: 'TaskName', headerText: 'Task Name', width: '180' },
        { field: 'resources', headerText: 'Resources', width: '160' },
        { field: 'Work', width: '110' },
        { field: 'Duration', width: '100' },
        { field: 'taskType', headerText: 'Task Type', width: '110' }
    ]
});
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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Configure duration units

Duration units determine how task length is measured and calculated within the project. The Gantt Chart control supports three duration units that can be applied at both project and individual task levels.

The Gantt Chart control supports the following duration units:

Day: Standard for general planning.
Hour: For detailed task management.
Minute: For short-duration tasks.

Configure using:

durationUnit: Sets global unit (default: day).
taskFields.durationUnit: Maps per-task units.
Duration field values: Includes units directly (e.g., “5 minutes”).

The following example maps duration units:

index.js
index.html
var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '450px',
    splitterSettings: {columnIndex:4},
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        durationUnit:'DurationUnit',
        parentID: 'ParentID',
    },
});
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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Defining duration unit with duration value:

The following example defines units in duration values:

index.js
index.html
var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '380px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        durationUnit: 'DurationUnit',
        parentID: 'ParentID'
    },
    splitterSettings: {
        columnIndex: 4
    }		
});
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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Enable unscheduled tasks

Unscheduled tasks lack start date, end date, or duration, visualized as milestones or single-day tasks. Enable with allowUnscheduledTasks set to true (default: false), defaulting to a 1-day duration from the project start.

Available unscheduled task types:

Start date only

Tasks with only a start date defined, allowing for open-ended planning.
End date only

Tasks with only an end date defined, useful for deadline-driven activities.
Duration only

Tasks with only duration specified, providing flexibility in scheduling timing.
Milestone

Special tasks with zero duration representing key project events or deliverables.

The following example enables unscheduled tasks:

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

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '380px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID'
    },
    editSettings: {
        allowEditing: true,
    },
    allowUnscheduledTasks: 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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Convert to milestone using method

You can convert a task into a milestone using the convertToMilestone method.

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

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '380px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID'
    },
    editSettings: {
        allowEditing: true,
    },
    allowUnscheduledTasks: true
});
ganttChart.appendTo('#Gantt');

var button= new ej.buttons.Button();
button.appendTo('#milestone');

document.getElementById('milestone').addEventListener('click', () => {
    var ganttObj= document.getElementById('Gantt').ej2_instances[0];
    ganttObj.convertToMilestone('6');
});
<!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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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="button">
                <button id="milestone">Convert Task 6 to Milestone</button>
            </div>
            <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>

Configure working time range

Working time ranges define productive hours per day, ensuring accurate scheduling calculations. Configure with dayWorkingTime sets project-wide working hours.

The following example sets working hours from 9 AM to 6 PM:

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

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID'
    },
    highlightWeekends: true,
    dayWorkingTime: [{ from: 9, to: 18 }],
    timelineSettings: {
        timelineViewMode: 'Day'
    },
    splitterSettings: {
        columnIndex: 0
    }
});
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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Configure weekends and non-working days

Non-working days represent periods when project work cannot be performed, such as weekends, holidays, or planned maintenance periods. These settings ensure realistic project scheduling by excluding non-productive time from calculations.

Configure work week

Define which days of the week are considered working days using the workWeek property.

The following example excludes Monday and Tuesday:

index.js
index.html
var ganttChart = new ej.gantt.Gantt({
    dataSource: ganttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        endDate: 'EndDate',
        duration: 'Duration',
        progress: 'Progress',
        parentID: 'ParentID'
    },
    workWeek: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday"],
    highlightWeekends: 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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">    
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>

Weekend configuration

Configure weekends with:

Default behavior: Saturday and Sunday are non-working.
Timeline display: timelineSettings.showWeekend controls visibility.
Working weekends: includeWeekend set to true includes weekends.

Customize scheduling with events

Customize scheduling with:

dataBound: Adjusts task scheduling after data binding, e.g., switching auto-scheduled tasks to manual mode if their start date precedes the project start date.

The following example uses dataBound to switch auto-scheduled tasks to manual mode if their start date is before the project start date (04/01/2025):

index.js
index.html
var ganttData = [
  { TaskID: 1, TaskName: 'Plan project', StartDate: new Date('04/03/2025'), Duration: 5, isManual: false },
  { TaskID: 2, TaskName: 'Develop feature', StartDate: new Date('04/03/2025'), Duration: 7, isManual: false },
  { TaskID: 3, TaskName: 'Test module', StartDate: new Date('03/31/2025'), Duration: 3, isManual: false }
];

var projectStartDate = new Date('04/01/2025');

var ganttChart = new ej.gantt.Gantt({
    dataSource: ganttData,
    height: '250px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        manual: 'isManual'
    },
    taskMode: 'Custom',
    dataBound:dataBound,
});
ganttChart.appendTo('#Gantt');

function dataBound() {
    const data = Array.isArray(ganttChart.dataSource) ? ganttChart.dataSource : [];
    data.forEach((task) => {
        if (!task.isManual && task.StartDate && new Date(task.StartDate) < projectStartDate) {
            task.isManual = true; // Switch to manual mode.
            const messageElement = document.getElementById('message');
            if (messageElement) {
                messageElement.textContent = `Task "${task.TaskName}" switched to manual mode as its start date is before project start date.`;
            }
       }
     });
}
<!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/ej2/32.1.19/tailwind3.css" rel="stylesheet" type="text/css">    
        <script src="https://cdn.syncfusion.com/ej2/32.1.19/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>
                <p id="message"></p>
            </div>
            <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>

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Scheduling Tasks in EJ2 JavaScript Gantt Chart Control

Configure scheduling modes

Automatically scheduled Tasks

Manually scheduled Tasks

Custom scheduled

Configure task types

Configure duration units

Enable unscheduled tasks

Convert to milestone using method

Configure working time range

Configure weekends and non-working days

Configure work week

Weekend configuration

Customize scheduling with events

See also