Drag and drop list items in Angular Listview component

27 Sep 20234 minutes to read

In ListView component, we don’t have drag and drop support. But we can achieve this requirement using TreeView component with ListView appearance.

Drag and Drop in TreeView component was enabled by setting allowDragAndDrop to true.

<ejs-treeview id='element' [fields]='fields' allowDragAndDrop='true'></ejs-treeview>

The TreeView component is used to represent hierarchical data in a tree like structure. So, list items in TreeView can be dropped to child of target element. we can prevent this behaviour by cancelling the nodeDragStop and nodeDragging events.

<ejs-treeview id='element' [fields]='fields' allowDragAndDrop='true' (nodeDragging)='onDragStop($event)' (nodeDragStop)='onDragStop($event)'></ejs-treeview>

fields= { dataSource: this.data, id: 'id', text: 'text' },

onDragStop(args) {
    //Block the Child Drop operation in TreeView
   let  draggingItem = document.getElementsByClassName("e-drop-in");
    if (draggingItem.length == 1) {
        draggingItem[0].classList.add('e-no-drop');
        args.cancel = true;
    }
}

In the below sample, we have rendered draggable list items.

app.component.ts

import { Component, ViewChild } from '@angular/core';

@Component({
    selector: 'my-app',
    template: `
          <div id="sample">
    <ejs-treeview id='element' [fields]='fields' allowDragAndDrop='true' (nodeDragging)='onDragStop($event)' (nodeDragStop)='onDragStop($event)'></ejs-treeview>
   </div>
        `,
  })

export class AppComponent {

  public data=[
    { text: 'Hennessey Venom', id: 'list-01' },
    { text: 'Bugatti Chiron', id: 'list-02' },
    { text: 'Bugatti Veyron Super Sport', id: 'list-03' },
    { text: 'SSC Ultimate Aero', id: 'list-04' },
    { text: 'Koenigsegg CCR', id: 'list-05' },
    { text: 'McLaren F1', id: 'list-06' },
    { text: 'Aston Martin One- 77', id: 'list-07' },
    { text: 'Jaguar XJ220', id: 'list-08' },
    { text: 'McLaren P1', id: 'list-09' },
    { text: 'Ferrari LaFerrari', id: 'list-10' },
];

public fields = { dataSource: this.data, id: 'id', text: 'text' };

onDragStop(args: any) {
    //Block the Child Drop operation in TreeView
    let draggingItem = document.getElementsByClassName("e-drop-in");
    if (draggingItem.length == 1) {
        draggingItem[0].classList.add('e-no-drop');
        args.cancel = true;
    }
}
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { TreeViewModule } from '@syncfusion/ej2-angular-navigations';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        TreeViewModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

main.ts

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

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);