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Task Scheduling in JavaScript (ES5) Gantt control

08 May 2023 / 8 minutes to read

The Gantt provides support for automatic and manual task scheduling modes. It is used to indicate whether the start date and end date of all the tasks will be automatically validated or not. taskMode is the property used to change the schedule mode of a task.

The Gantt control supports three types of mode. They are:

Auto: All the tasks are automatically validate.
Manual: All the tasks are manually validate by the user.
Custom: Both Auto and Manual tasks are render by mapped from data source.

Note: The default value of taskMode is Auto.

Automatically Scheduled Tasks

When the taskMode property is set as Auto, the start date and end date of all the tasks in the project will be automatically validated. That is, dates are validated based on various factors such as working time, holidays, weekends and predecessors.

Source

Preview

index.js

index.html

ej.gantt.Gantt.Inject(ej.gantt.Edit,ej.gantt.Toolbar,ej.gantt.Selection);

var gantt = new ej.gantt.Gantt({
     dataSource: GanttData,
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        endDate: 'EndDate',
        dependency: 'Predecessor',
        child: 'Children',
    },
    height: '450px',
    taskMode : 'Auto',
    toolbar: ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll', 'Search'],
    treeColumnIndex: 1,
    editSettings: {
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: 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/ej2/21.2.3/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.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

When the taskMode property is set as Manual, the start date and end date of all the tasks in the project will be same as given in the data source. That is, dates are not validated based on various factors such as dependencies between tasks, holidays, weekends, working time. We can restrict this mode in predecessor validation alone. That is, we can automatically validate the dates based on predecessor values by enabling the validateManualTasksOnLinking property.

Source

Preview

index.js

index.html

ej.gantt.Gantt.Inject(ej.gantt.Edit,ej.gantt.Toolbar,ej.gantt.Selection);

var gantt = new ej.gantt.Gantt({
     dataSource: GanttData,
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        endDate: 'EndDate',
        dependency: 'Predecessor',
        child: 'Children',
    },
    height: '450px',
    taskMode : 'Manual',
    toolbar: ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll', 'Search'],
    treeColumnIndex: 1,
    editSettings: {
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: 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/ej2/21.2.3/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.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

When the taskMode property is set as Custom, the scheduling mode for each tasks will be mapped from the data source field. The Boolean property taskFields.manual is used to map the manual scheduling mode field from the data source.

Source

Preview

index.js

index.html

ej.gantt.Gantt.Inject(ej.gantt.Edit,ej.gantt.Toolbar,ej.gantt.Selection);
var GanttData = [
    {
        'TaskID': 1,
        'TaskName': 'Parent Task 1',
        'StartDate': new Date('02/27/2017'),
        'EndDate': new Date('03/03/2017'),
        'Progress': '40',
        'isManual' : true,
        'Children': [
             { 'TaskID': 2, 'TaskName': 'Child Task 1', 'StartDate': new Date('02/27/2017'),
             'EndDate': new Date('03/03/2017'), 'Progress': '40' },
             { 'TaskID': 3, 'TaskName': 'Child Task 2', 'StartDate': new Date('02/26/2017'),
             'EndDate': new Date('03/03/2017'), 'Progress': '40', 'isManual': true },
             { 'TaskID': 4, 'TaskName': 'Child Task 3', 'StartDate': new Date('02/27/2017'),
             'EndDate': new Date('03/03/2017'), 'Duration': 5, 'Progress': '40', }
        ]
    },
    {
        'TaskID': 5,
        'TaskName': 'Parent Task 2',
        'StartDate': new Date('03/05/2017'),
        'EndDate': new Date('03/09/2017'),
        'Progress': '40',
        'isManual': true,
        'Children': [
             { 'TaskID': 6, 'TaskName': 'Child Task 1', 'StartDate': new Date('03/06/2017'),
             'EndDate': new Date('03/09/2017'), 'Progress': '40' },
             { 'TaskID': 7, 'TaskName': 'Child Task 2', 'StartDate': new Date('03/06/2017'),
             'EndDate': new Date('03/09/2017'), 'Progress': '40', },
             { 'TaskID': 8, 'TaskName': 'Child Task 3', 'StartDate': new Date('02/28/2017'),
             'EndDate': new Date('03/05/2017'), 'Progress': '40', 'isManual': true },
             { 'TaskID': 9, 'TaskName': 'Child Task 4', 'StartDate': new Date('03/04/2017'),
             'EndDate': new Date('03/09/2017'), 'Progress': '40', 'isManual': true }
        ]
    },
    {
        'TaskID': 10,
        'TaskName': 'Parent Task 3',
        'StartDate': new Date('03/13/2017'),
        'EndDate': new Date('03/17/2017'),
        'Progress': '40',
        'Children': [
             { 'TaskID': 11, 'TaskName': 'Child Task 1', 'StartDate': new Date('03/13/2017'),
             'EndDate': new Date('03/17/2017'), 'Progress': '40' },
             { 'TaskID': 12, 'TaskName': 'Child Task 2', 'StartDate': new Date('03/13/2017'),
             'EndDate': new Date('03/17/2017'), 'Progress': '40', },
             { 'TaskID': 13, 'TaskName': 'Child Task 3', 'StartDate': new Date('03/13/2017'),
             'EndDate': new Date('03/17/2017'), 'Progress': '40', },
             { 'TaskID': 14, 'TaskName': 'Child Task 4', 'StartDate': new Date('03/12/2017'),
             'EndDate': new Date('03/17/2017'), 'Progress': '40', 'isManual': true },
             { 'TaskID': 15, 'TaskName': 'Child Task 5', 'StartDate': new Date('03/13/2017'),
             'EndDate': new Date('03/17/2017'), 'Progress': '40' }
        ]
    }
];
var gantt = new ej.gantt.Gantt({
    dataSource: GanttData,
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        endDate: 'EndDate',
        dependency: 'Predecessor',
        child: 'Children',
        manual: 'isManual',
    },
    height: '450px',
    taskMode : 'Custom',
    toolbar: ['Add', 'Edit', 'Update', 'Delete', 'Cancel', 'ExpandAll', 'CollapseAll', 'Search'],
    columns: [
        { field: 'TaskID', visible: false},
        {field: 'TaskName'},
        { field: 'isManual'}
    ],
    treeColumnIndex: 1,
    editSettings: {
        allowEditing: true,
        allowDeleting: true,
        allowTaskbarEditing: true,
        showDeleteConfirmDialog: 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/ej2/21.2.3/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.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>

Unscheduled Tasks

Unscheduled tasks are planned for a project without any definite schedule dates. The Gantt control supports rendering the unscheduled tasks. You can create or update the tasks with anyone of start date, end date, and duration values or none. You can enable or disable the unscheduled tasks by using the allowUnscheduledTasks property. The following images represent the various types of unscheduled tasks in Gantt.

Taskbar state	Auto	Manual
`Start Date Only`
`End Date Only`
`Duration Only`
`Milestone`

Note: A milestone is a task that has no start and end dates, but it has a duration value of zero

Define unscheduled tasks in data source

You can define the various types of unscheduled tasks in the data source as follows

Source

Preview

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', Duration: 3, Progress: 50},
                { TaskID: 3, TaskName: 'Perform Soil test', StartDate: new Date('04/02/2019'), Progress: 50   },
                { TaskID: 4, TaskName: 'Soil test approval', EndDate: new Date('04/08/2019'), 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'),EndDate: new Date('04/08/2019'), Progress: 50 },
                { TaskID: 7, TaskName: 'List materials', StartDate: new Date('04/04/2019'), Progress: 50  },
                { TaskID: 8, TaskName: 'Estimation approval',Duration: 0,Progress: 50}
            ]
        },
    ];
var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
			endDate:'EndDate',
			duration:'Duration',
            progress: 'Progress',
			child: 'subtasks'
        },
		editSettings: {
		   allowEditing:true,
		   allowTaskbarEditing: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/ej2/21.2.3/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.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 If the allowUnscheduledTasks property is set to false, then the Gantt control automatically calculates the scheduled date values with a default value of duration 1 and the project start date is considered as the start date for the task.

Working Time Range

In the Gantt control, working hours in a day for a project can be defined by using the dayWorkingTime property. Based on the working hours, automatic date scheduling and duration validations for a task are performed.

The following code snippet explains how to define the working time range for the project in Gantt.

Source

Preview

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',
			duration: 'Duration',
            progress: 'Progress',
			child: 'subtasks'
        },
		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/ej2/21.2.3/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.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

Individual tasks can lie between any time within the defined working time range of the project.

The dayWorkingTime property is used to define the working time for the whole project.

Weekend/Non-working days

Non-working days/weekend are used to represent the non-productive days in a project. You can define the non-working days in a week using the workWeek property in Gantt.

Source

Preview

index.js

index.html

var ganttData = [
        {
            TaskID: 1,
            TaskName: 'Project Initiation',
            StartDate: new Date('04/02/2019'),
            EndDate: new Date('04/21/2019'),
			isParent:true,
            subtasks: [
                { TaskID: 2, TaskName: 'Identify Site location', StartDate: new Date('04/02/2019'), Duration: 3, Progress: 50,isParent:false },
                { TaskID: 3, TaskName: 'Perform Soil test', StartDate: new Date('04/02/2019'), Duration: 3, Progress: 70, resources: [2, 3, 5],isParent:false   },
                { TaskID: 4, TaskName: 'Soil test approval', StartDate: new Date('04/02/2019'), Duration: 3, Predecessor:"2FS", Progress: 80,isParent:false  },
            ]
        },
        {
            TaskID: 5,
            TaskName: 'Project Estimation',
            StartDate: new Date('04/02/2019'),
            EndDate: new Date('04/21/2019'),
			isParent:true,
            subtasks: [
                { TaskID: 6, TaskName: 'Develop floor plan for estimation', StartDate: new Date('04/04/2019'), Duration: 4, Progress: 50, resources: [4],isParent:false  },
                { TaskID: 7, TaskName: 'List materials', StartDate: new Date('04/04/2019'), Duration: 4, Progress: 50, DurationUnit:'day', resources: [4, 8],isParent:false  },
                { TaskID: 8, TaskName: 'Estimation approval', StartDate: new Date('04/04/2019'), Duration: 4,Predecessor:"6SS", DurationUnit:'minute', Progress: 70, resources: [12, 5],isParent:false  }
            ]
        },
    ];
var ganttChart = new ej.gantt.Gantt({
        dataSource: ganttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
			duration: 'Duration',
            progress: 'Progress',
			child: 'subtasks'
        },
	    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/ej2/21.2.3/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.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>

By default, Saturdays and Sundays are considered as non-working days/weekend in a project. In the Gantt control, you can make weekend as working day by setting the includeWeekend property to true.

Contents

Automatically Scheduled Tasks
Manually Scheduled Tasks
Custom
Unscheduled Tasks
Define unscheduled tasks in data source
Working Time Range
WeekendNon-working days

Contents

Automatically Scheduled Tasks
Manually Scheduled Tasks
Custom
Unscheduled Tasks
Define unscheduled tasks in data source
Working Time Range
WeekendNon-working days