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Overview Control in JavaScript (ES5) Diagram control

22 Oct 2021 / 4 minutes to read

Overview control allows you to see a preview or an overall view of the entire content of a diagram. This helps you to look at the overall picture of a large diagram and also to navigate, pan, or zoom, on a particular position of the page.

When you work on a very large diagram, you may not know the part you are actually working on, or navigation from one part to another might be difficult. One solution for navigation is to zoom out the entire diagram and find where you are. Then, you can zoom in a particular area you want to. This solution is not suitable when you need some frequent navigation.

Overview control solves these problems by showing a preview, that is, an overall view of the entire diagram. A rectangle indicates viewport of the diagram. Navigation becomes easy by dragging this rectangle.

Create overview

The sourceID property of overview should be set with the corresponding diagram ID for the overall view.

The width and height properties of the overview allow you to define the size of the overview.

The following code illustrates how to create overview.

Zoom and Pan

In overview, the view port of the diagram is highlighted with a red colored rectangle. Diagram can be zoomed/panned by interacting with that. You can interact with overview as follows:

  • Resize the rectangle: Zooms in/out the diagram.
  • Drag the rectangle: Pans the diagram.
  • Click at a position: Navigates to the clicked region.
  • Choose a particular region by clicking and dragging: Navigates to the specified region.

The following image shows how the diagram is zoomed/panned with overview.

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ej.diagrams.Diagram.Inject(ej.diagrams.DataBinding, ej.diagrams.HierarchicalTree);
// A node is created and stored in nodes array.
var data = [
        'Id': 'parent', 'Name': 'Maria Anders', 'Designation': 'Managing Director',
        'ImageUrl': '../content/images/orgchart/Clayton.png', 'IsExpand': 'true', 'RatingColor': '#C34444'
        'Id': 1, 'Name': 'Ana Trujillo', 'Designation': 'Project Manager',
        'ImageUrl': '../content/images/orgchart/Thomas.PNG', 'IsExpand': 'false',
        'RatingColor': '#68C2DE', 'ReportingPerson': 'parent'
        'Id': 2, 'Name': 'Anto Moreno', 'Designation': 'Project Lead',
        'ImageUrl': '../content/images/orgchart/image53.png', 'IsExpand': 'false',
        'RatingColor': '#93B85A', 'ReportingPerson': 'parent'
        'Id': 3, 'Name': 'Thomas Hardy', 'Designation': 'Senior S/w Engg',
        'ImageUrl': '../content/images/orgchart/image57.png', 'IsExpand': 'false',
        'RatingColor': '#68C2DE', 'ReportingPerson': 1
        'Id': 4, 'Name': 'Christina kaff', 'Designation': 'S/w Engg',
        'ImageUrl': '../content/images/orgchart/Robin.png', 'IsExpand': 'false',
        'RatingColor': '#93B85A', 'ReportingPerson': 3
var items = new , new;
var overview;
var diagram = new ej.diagrams.Diagram({
    snapSettings: { constraints: 0 },
    layout: {
        type: 'OrganizationalChart', margin: { top: 20 },
        getLayoutInfo: (node, tree) => {
            if (!tree.hasSubTree) {
                tree.orientation = 'Vertical';
                tree.type = 'Alternate';
    dataSourceSettings: {
        id: 'Id', parentId: 'ReportingPerson', dataManager: items

    getNodeDefaults: (obj) => {
        obj.height = 50;
        obj.backgroundColor = 'lightgrey'; = { fill: 'transparent', strokeWidth: 2 };
        return obj;
    }, getConnectorDefaults: (connector) => {
        connector.targetDecorator.shape = 'None';
        connector.type = 'Orthogonal';
        return connector;

    setNodeTemplate: (obj) => {
        var content = new ej.diagrams.StackPanel(); = + '_outerstack'; = 'darkgreen';
        content.orientation = 'Horizontal';
        content.padding = { left: 5, right: 10, top: 5, bottom: 5 };
        var image = new ej.diagrams.ImageElement();
        image.width = 50;
        image.height = 50; = 'none';
        image.source = './employee.PNG'; = + '_pic';
        var innerStack = new ej.diagrams.StackPanel(); = 'none';
        innerStack.margin = { left: 5, right: 0, top: 0, bottom: 0 }; = + '_innerstack';

        var text = new ej.diagrams.TextElement();
        text.content =['Name']; = 'blue'; = 'none'; = 'none'; = + '_text1';

        var desigText = new ej.diagrams.TextElement();
        desigText.margin = { left: 0, right: 0, top: 5, bottom: 0 };
        desigText.content =['Designation']; = 'blue'; = 'none'; = 'none'; = 'Wrap'; = + '_desig';
        innerStack.children = [text, desigText];

        content.children = [image, innerStack];

        return content;
overview = new ej.diagrams.Overview({
    sourceID: 'element'
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Diagram</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//" rel="stylesheet">
    <link href="//" rel="stylesheet">
    <link href="//" rel="stylesheet">
    <link href="//" rel="stylesheet">
    <link href="//" rel="stylesheet">
    <link href="//" rel="stylesheet">
<script src="" type="text/javascript"></script>

    <div id="container">
         <div style="width:74%;height: 500px; float:left">
        <div id="element"></div>
    <div style="width:25%;height:200px;float:left; border-color:lightgray;border-style:solid;">
        <div id="overview"></div>

var ele = document.getElementById('container');
if(ele) { = "visible";
<script src="index.js" type="text/javascript"></script>