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Data Binding in React ContextMenu component

14 Apr 2021 / 1 minute to read

In the following example, menu items are populated from data source and mapped to items property.

Source
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index.tsx
index.html
index.css
datasource.tsx
index.jsx
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import { ContextMenuComponent, MenuEventArgs, MenuItemModel } from '@syncfusion/ej2-react-navigations';
import * as React from 'react';
import * as ReactDom from 'react-dom';
// @ts-ignore
import { data, IRecord } from '../datasource.tsx';


class App extends React.Component<{}, {}> {

    public getMenuItems = () => {
        let record: IRecord;
        const menuItems: MenuItemModel[] = [];
        for (const d of data) {
            record = d as IRecord;
            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 });
            }
        }
        return menuItems;
    }

    public itemBeforeEvent: any = (args: MenuEventArgs) => {
        if (!args.item.text) {
            args.element.classList.add('e-separator');
        }
    }

    public render() {
        return (
            <div className="container">
                <div id='target'>Right click / Touch hold to open the ContextMenu</div>
                <ContextMenuComponent id='contextmenu' target='#target'
                    items={this.getMenuItems()} beforeItemRender = {this.itemBeforeEvent} />
            </div>
        );
    }
}

ReactDom.render(<App />,document.getElementById('element'));
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ContextMenu</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <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" />
    <link href="index.css" rel="stylesheet" />
    <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='element'>
        <div id='loader'>Loading....</div>
    </div>
</body>

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

#target {
	border: 1px dashed;
	height: 150px;
	padding: 10px;
	position: relative;
	text-align: justify;
	color: gray;
	user-select: none;
}
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export let data: IRecord[] = [
    { id: 1, parentId: null, text: 'View' },
    { id: 2, parentId: null, text: 'Sort by' },
    { id: 3, parentId: null, text: '' },
    { id: 4, parentId: null, text: 'New' },
    { id: 5, parentId: null, text: '' },
    { id: 6, parentId: null, text: 'Display Settings' },
    { id: 7, parentId: null, text: 'Personalize' },
    //first level child
    { id: 8, parentId: 1, text: 'Large Icons' },
    { id: 9, parentId: 1, text: 'Medium Icons' },
    { id: 10, parentId: 1, text: 'Small Icons' },
    { id: 11, parentId: 2, text: 'Name' },
    { id: 12, parentId: 2, text: 'Size' },
    { id: 13, parentId: 4, text: 'Folder' },
    { id: 14, parentId: 4, text: 'Shortcut' },
    { id: 15, parentId: 4, text: '' },
    { id: 16, parentId: 4, text: 'Contact' }
];

export interface IRecord {
    id: number,
    parentId: number,
    text: string
}
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import { ContextMenuComponent } from '@syncfusion/ej2-react-navigations';
import * as React from 'react';
import * as ReactDom from 'react-dom';
// @ts-ignore
import { data } from '../datasource.tsx';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.getMenuItems = () => {
            let record;
            const menuItems = [];
            for (const d of data) {
                record = d;
                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 });
                }
            }
            return menuItems;
        };
        this.itemBeforeEvent = (args) => {
            if (!args.item.text) {
                args.element.classList.add('e-separator');
            }
        };
    }
    render() {
        return (<div className="container">
                <div id='target'>Right click / Touch hold to open the ContextMenu</div>
                <ContextMenuComponent id='contextmenu' target='#target' items={this.getMenuItems()} beforeItemRender={this.itemBeforeEvent}/>
            </div>);
    }
}
ReactDom.render(<App />, document.getElementById('element'));

While accessing Array we got the exception ‘object is possibly undefined’ due to ‘strictNullChecks’ option. So you can disable it in ‘tsconfig.json’ file.

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