Template and Multilevel nesting in Angular ContextMenu component

14 Apr 2021 / 2 minutes to read

Template

The ContextMenu items can be customized using the beforeItemRender property. The item render event triggers while rendering each menu item. The event argument will be used to identify the menu item and customized it based on the requirement. In the following sample, the menu item is rendered with keycode for specified action in ContextMenu using the template. Here, the keycode is specified for Save as, View page source, and Inspect in the right side corner of the menu items by adding span element in the beforeItemRender event.

Source

Preview

app.component.ts

app.module.ts

main.ts

import { Component } from '@angular/core';
import { createElement } from '@syncfusion/ej2-base';
import { MenuEventArgs, MenuItemModel } from '@syncfusion/ej2-navigations';

@Component({
  selector: 'app-root',
  template: `<!--target element-->
            <div id="target">Right click / Touch hold to open the ContextMenu</div>
            <!-- To Render ContextMenu. -->
            <ejs-contextmenu id='contextmenu' #contextmenu target='#target' [items]='menuItems' (beforeItemRender)='itemBeforeEvent($event)'></ejs-contextmenu>`
})

export class AppComponent {
    public menuItems: MenuItemModel[] = [
        {
            text: 'Save as...'
        },
        {
            text: 'View page source'
        },
        {
            text: 'Inspect'
        }];

    public itemBeforeEvent (args: MenuEventArgs) {
        let shortCutSpan: HTMLElement = createElement('span');
        let text: string = args.item.text;
        let shortCutText: string = text === 'Save as...' ? 'Ctrl + S' : (text === 'View page source' ? 'Ctrl + U'      : 'Ctrl + Shift + I');
        shortCutSpan.textContent = shortCutText;
        args.element.appendChild(shortCutSpan);
        shortCutSpan.setAttribute('class','shortcut');
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ContextMenuModule } from '@syncfusion/ej2-angular-navigations';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        ContextMenuModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

To create span element, createElement utility function used from ej2-base.

Multilevel nesting

The Multiple level nesting supports in ContextMenu. It can be achieved by mapping the items property inside the parent menuItems. In the following sample, three level nesting of ContextMenu is provided.