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Populate menu items with data source in JavaScript ContextMenu control

02 Dec 2021 / 1 minute to read

To bind local data source to the ContextMenu, menu items are populated from data source and mapped to items property.

The below example demonstrates how to bind local data source to the ContextMenu and separator is added using insertAfter method.

Source
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app.ts
datasource.ts
index.html
styles.css
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import { Record, data } from './datasource.ts';
import { ContextMenu, MenuItemModel, ContextMenuModel, MenuEventArgs } from '@syncfusion/ej2-navigations';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

let record: Record;
let menuItems: MenuItemModel[] = [];

// Iterate data from 'datasource.ts' to construct menu item model.
for (let i: number = 0; i < data.length; i++) {
    record = data[i] as Record;
    if (record.parentId) {
        if (!menuItems[record.parentId - 1].items) {
            menuItems[record.parentId - 1].items = []
        }
        menuItems[record.parentId - 1].items.push({ text: record.text });
    } else {
        menuItems.push({ text: record.text });
    }
}

// Initialize ContextMenu options.
let menuOptions: ContextMenuModel = {
    target: '#target',
    items: menuItems
};

// Initialize ContextMenu component.
let menuObj: ContextMenu = new ContextMenu(menuOptions, '#contextmenu');

// To insert an item after the particular item.
menuObj.insertAfter([{separator: true}], 'Sort by');
menuObj.insertAfter([{separator: true}], 'New');
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export let data: Record[] = [
    { id: 1, parentId: null, text: 'View' },
    { id: 2, parentId: null, text: 'Sort by' },
    { id: 3, parentId: null, text: 'New' },
    { id: 4, parentId: null, text: 'Display Settings' },
    { id: 5, parentId: null, text: 'Personalize' },
    //first level child
    { id: 6, parentId: 1, text: 'Large Icons' },
    { id: 7, parentId: 1, text: 'Medium Icons' },
    { id: 8, parentId: 1, text: 'Small Icons' },
    { id: 9, parentId: 2, text: 'Name' },
    { id: 10, parentId: 2, text: 'Size' },
    { id: 11, parentId: 4, text: 'Folder' },
    { id: 12, parentId: 4, text: 'Shortcut' },
    { id: 13, parentId: 4, text: 'Contact' }
];

export interface Record {
    id: number,
    parentId: number,
    text: string
}
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />
    <meta name="description" content="Essential JS 2" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    
    <!--style reference from app-->
    <link href="styles.css" rel="stylesheet" />

    <!--system js reference and configuration-->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <!--target element-->
        <div id="target">Right click / Touch hold to open the ContextMenu</div>
        <!--element which is going to render-->
        <ul id="contextmenu"></ul>        
    </div>
</body>

</html>
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#container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

button {
  margin: 20px 0 0 5px;
}

#target {
  border: 1px dashed;
  height: 150px;
  padding: 10px;
  position: relative;
  text-align: justify;
  color: gray;
  user-select: none;
}