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Backend API
$(() => {
const gantt = $('#gantt').dxGantt({
validation: {
autoUpdateParentTasks: true,
validateDependencies: true,
enablePredecessorGap: true,
},
tasks: {
dataSource: tasks,
},
dependencies: {
dataSource: dependencies,
},
editing: {
enabled: true,
},
columns: [{
dataField: 'title',
caption: 'Task',
width: 300,
}, {
dataField: 'start',
caption: 'Start Date',
}, {
dataField: 'end',
caption: 'End Date',
}],
taskListWidth: 500,
taskTitlePosition: 'none',
}).dxGantt('instance');
$('#autoUpdateParentTasks').dxCheckBox({
text: 'Auto Update Parent Tasks',
value: true,
onValueChanged(e) {
gantt.option('validation.autoUpdateParentTasks', e.value);
},
});
$('#validateDependencies').dxCheckBox({
text: 'Enable Dependency Validation',
value: true,
onValueChanged(e) {
gantt.option('validation.validateDependencies', e.value);
},
});
$('#enablePredecessorGap').dxCheckBox({
text: 'Enable Predecessor Gap',
value: true,
onValueChanged(e) {
gantt.option('validation.enablePredecessorGap', e.value);
},
});
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<script src="https://cdn3.devexpress.com/jslib/24.1.5/js/dx-gantt.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.5/css/dx.light.css" />
<link rel="stylesheet" href="https://cdn3.devexpress.com/jslib/24.1.5/css/dx-gantt.min.css" />
<script src="js/dx.all.js"></script>
<script src="data.js"></script>
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div class="options">
<div class="caption">Options</div>
<div class="option">
<div id="autoUpdateParentTasks"></div>
</div>
<div class="option">
<div id="validateDependencies"></div>
</div>
<div class="option">
<div id="enablePredecessorGap"></div>
</div>
</div>
<div id="gantt"> </div>
</div>
</body>
</html>
#gantt {
height: 700px;
}
.options {
margin-bottom: 20px;
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
position: relative;
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option {
margin-top: 10px;
margin-right: 40px;
display: inline-block;
}
.option:last-child {
margin-right: 0;
}
const currentDate = new Date(Date.now());
const month = currentDate.getMonth();
const year = currentDate.getFullYear();
const tasks = [{
id: 1,
parentId: 0,
title: 'Johnson Residence Construction Project',
start: new Date(year, month - 1, 1),
end: new Date(year, month - 1, 1),
progress: 0,
}, {
id: 2,
parentId: 1,
title: 'Planning and Pre-Construction Phase',
start: new Date(year, month - 1, 1),
end: new Date(year, month - 1, 1),
progress: 0,
}, {
id: 3,
parentId: 2,
title: 'Architectural Design and Site Planning',
start: new Date(year, month - 1, 1),
end: new Date(year, month - 1, 15),
progress: 0,
}, {
id: 4,
parentId: 2,
title: 'Engineering and Final Blueprint',
start: new Date(year, month - 1, 8),
end: new Date(year, month - 1, 15),
progress: 0,
}, {
id: 5,
parentId: 2,
title: 'City Permits and Contracts',
start: new Date(year, month - 1, 15),
end: new Date(year, month - 1, 18),
progress: 0,
}, {
id: 6,
parentId: 1,
title: 'Construction Phase',
start: new Date(year, month - 1, 18),
end: new Date(year, month - 1, 18),
progress: 0,
}, {
id: 7,
parentId: 6,
title: 'Grading and Excavation',
start: new Date(year, month - 1, 18),
end: new Date(year, month - 1, 22),
progress: 0,
}, {
id: 8,
parentId: 6,
title: 'Demolition and Removal',
start: new Date(year, month - 1, 19),
end: new Date(year, month - 1, 23),
progress: 0,
}, {
id: 9,
parentId: 6,
title: 'Foundation and Concrete ',
start: new Date(year, month - 1, 22),
end: new Date(year, month - 1, 28),
progress: 0,
}, {
id: 10,
parentId: 6,
title: 'Rough Framing and Carpentery',
start: new Date(year, month - 1, 25),
end: new Date(year, month, 5),
progress: 0,
}, {
id: 11,
parentId: 6,
title: 'Inspection (Structure)',
start: new Date(year, month, 5),
end: new Date(year, month, 5),
progress: 0,
}, {
id: 12,
parentId: 6,
title: 'Electrical Rough-in',
start: new Date(year, month, 6),
end: new Date(year, month, 19),
progress: 0,
}, {
id: 13,
parentId: 6,
title: 'Plumbing Rough-in',
start: new Date(year, month, 19),
end: new Date(year, month, 19),
progress: 0,
}, {
id: 14,
parentId: 6,
title: 'Heating and A/C',
start: new Date(year, month, 19),
end: new Date(year, month, 26),
progress: 0,
}, {
id: 15,
parentId: 6,
title: 'Drywall',
start: new Date(year, month, 25),
end: new Date(year, month + 1, 10),
progress: 0,
}, {
id: 16,
parentId: 6,
title: 'Painting (Exterior)',
start: new Date(year, month + 1, 7),
end: new Date(year, month + 1, 21),
progress: 0,
}, {
id: 17,
parentId: 6,
title: 'Interior Carpentery (Interior)',
start: new Date(year, month + 1, 17),
end: new Date(year, month + 1, 28),
progress: 0,
}, {
id: 18,
parentId: 6,
title: 'Flooring and Interior Paint',
start: new Date(year, month + 1, 26),
end: new Date(year, month + 2, 9),
progress: 0,
}, {
id: 19,
parentId: 1,
title: 'Final Phase',
start: new Date(year, month + 2, 9),
end: new Date(year, month + 2, 9),
progress: 0,
}, {
id: 20,
parentId: 19,
title: 'Review-Punch List',
start: new Date(year, month + 2, 9),
end: new Date(year, month + 2, 23),
progress: 0,
}, {
id: 21,
parentId: 19,
title: 'Final Inspection',
start: new Date(year, month + 2, 24),
end: new Date(year, month + 2, 24),
progress: 0,
}, {
id: 22,
parentId: 19,
title: 'Final Paperwork and Documents',
start: new Date(year, month + 2, 24),
end: new Date(year, month + 2, 28),
progress: 0,
}];
const dependencies = [{
id: 1,
predecessorId: 4,
successorId: 5,
type: 0,
}, {
id: 2,
predecessorId: 5,
successorId: 7,
type: 0,
}, {
id: 3,
predecessorId: 12,
successorId: 13,
type: 0,
}, {
id: 4,
predecessorId: 13,
successorId: 14,
type: 0,
}, {
id: 5,
predecessorId: 18,
successorId: 20,
type: 0,
}, {
id: 6,
predecessorId: 21,
successorId: 22,
type: 0,
}];
The JavaScript Gantt supports the following dependency validation rules:
- Finish to Start (FS) - A successor task's start point should be equal or later than the preceding task's end point.
- Start to Start (SS) - A successor task's start point should be equal or later than the preceding task's start point.
- Finish to Finish (FF) - A successor task's end point should be equal or later than the preceding task's end point.
- Start to Finish (SF) - A successor task's end point should be equal or later than a preceding task's start point.
The JavaScript Gantt also has the autoUpdateParentTasks property that enables validation for parent-child relationship:
- A parent task's duration equals a summary duration of its child tasks.
- A parent task and its first child starts at the same time.
- A parent task and its last child ends at the same time.
- A parent task's progress is a summary progress of its child tasks.
The JavaScript Gantt processes changes in task values before they are saved to a database. The component displays a popup window with a list of available actions if an error can be handled in several ways.