Change menu items dynamically in React Context menu component

30 Jan 20237 minutes to read

The items visible in the ContextMenu can be changed dynamically based on the context you open. To achieve this behavior, initialize ContextMenu with all items using items property and then based on the context you open hide/show required items using hideItems/showItems method in beforeOpen event.

In the following example, the datasource for Clipboard div is Cut, Copy, Paste and for the Editor div is Add, Edit, Delete is changed on beforeOpen event using hideItems and showItems method.

index.jsx

import { enableRipple } from '@syncfusion/ej2-base';
import { ContextMenuComponent } from '@syncfusion/ej2-react-navigations';
import * as React from 'react';
import * as ReactDom from 'react-dom';
enableRipple(true);
function App() {
    let cmenuInstance;
    let menuItems = [
        {
            text: 'Cut'
        },
        {
            text: 'Copy'
        },
        {
            text: 'Paste'
        },
        {
            text: 'Add'
        },
        {
            text: 'Edit'
        },
        {
            text: 'Delete'
        }
    ];
    function beforeOpen(args) {
        if (args.event.target.id === 'right') {
            cmenuInstance.hideItems(['Cut', 'Copy', 'Paste']);
            cmenuInstance.showItems(['Add', 'Edit', 'Delete']);
        }
        else if (args.event.target.id === 'left') {
            cmenuInstance.showItems(['Cut', 'Copy', 'Paste']);
            cmenuInstance.hideItems(['Add', 'Edit', 'Delete']);
        }
    }
    return (<div className="container">
            <div id="target">
                <div id='right' className='e-div'>Editor</div>
                <div id='left' className='e-div'>Clipboard</div>
            </div>
            <ContextMenuComponent id='contextmenu' target='#target' ref={cmenu => cmenuInstance = cmenu} items={menuItems} beforeOpen={beforeOpen}/>
          </div>);
}
export default App;
ReactDom.render(<App />, document.getElementById('element'));

index.tsx

import { enableRipple } from '@syncfusion/ej2-base';
import { BeforeOpenCloseMenuEventArgs } from '@syncfusion/ej2-navigations';
import { ContextMenuComponent, MenuItemModel } from '@syncfusion/ej2-react-navigations';
import * as React from 'react';
import * as ReactDom from 'react-dom';

enableRipple(true);

function App() {
  let cmenuInstance: ContextMenuComponent;
  let menuItems: MenuItemModel[] = [
    {
        text: 'Cut'
    },
    {
        text: 'Copy'
    },
    {
        text: 'Paste'
    },
    {
        text: 'Add'
    },
    {
        text: 'Edit'
    },
    {
        text: 'Delete'
    }];

  function beforeOpen(args: BeforeOpenCloseMenuEventArgs) {
      if ((args.event.target as HTMLElement).id === 'right') {
        cmenuInstance.hideItems(['Cut', 'Copy', 'Paste']);
        cmenuInstance.showItems(['Add', 'Edit', 'Delete']);
      } else if ((args.event.target as HTMLElement).id === 'left') {
        cmenuInstance.showItems(['Cut', 'Copy', 'Paste']);
        cmenuInstance.hideItems(['Add','Edit','Delete']);
      }
  }

  return (
          <div className="container">
            <div id="target">
                <div id='right' className='e-div'>Editor</div>
                <div id='left' className='e-div'>Clipboard</div>
            </div>
            <ContextMenuComponent id='contextmenu' target='#target' ref={cmenu => cmenuInstance = cmenu as ContextMenuComponent}
            items={menuItems} beforeOpen={beforeOpen}/>
          </div>
      );
}
export default App;
ReactDom.render(<App />,document.getElementById('element'));