Restrict the drag and drop for particular tree nodes in React TreeView component

23 Jan 202516 minutes to read

You can able to restrict to drag and drop files under folder only. These can be achieved by using nodeDragStop and nodeDragging event of TreeView.

import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { TreeViewComponent } from '@syncfusion/ej2-react-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);
function App() {
    // Hierarchical data source for TreeView component
    let hierarchicalData = [
        {
            nodeId: '01', nodeText: 'Music', icon: 'folder',
            nodeChild: [
                { nodeId: '01-01', nodeText: 'Gouttes.mp3', icon: 'audio' }
            ]
        },
        {
            nodeId: '02', nodeText: 'Videos', icon: 'folder',
            nodeChild: [
                { nodeId: '02-01', nodeText: 'Naturals.mp4', icon: 'video' },
                { nodeId: '02-02', nodeText: 'Wild.mpeg', icon: 'video' },
            ]
        },
        {
            nodeId: '03', nodeText: 'Documents', icon: 'folder',
            nodeChild: [
                { nodeId: '03-01', nodeText: 'Environment Pollution.docx', icon: 'docx' },
                { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx', icon: 'docx' },
                { nodeId: '03-03', nodeText: 'Global Warming.ppt', icon: 'ppt' },
                { nodeId: '03-04', nodeText: 'Social Network.pdf', icon: 'pdf' },
                { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf', icon: 'pdf' },
            ]
        },
        {
            nodeId: '04', nodeText: 'Pictures', icon: 'folder', expanded: true,
            nodeChild: [
                {
                    nodeId: '04-01', nodeText: 'Camera Roll', icon: 'folder', expanded: true,
                    nodeChild: [
                        { nodeId: '04-01-01', nodeText: 'WIN_20160726_094117.JPG', image: 'https://ej2.syncfusion.com/demos/src/treeview/images/employees/9.png' },
                        { nodeId: '04-01-02', nodeText: 'WIN_20160726_094118.JPG', image: 'https://ej2.syncfusion.com/demos/src/treeview/images/employees/3.png' },
                    ]
                },
                { nodeId: '04-02', nodeText: 'Wind.jpg', icon: 'images' },
                { nodeId: '04-03', nodeText: 'Stone.jpg', icon: 'images' },
            ]
        },
        {
            nodeId: '05', nodeText: 'Downloads', icon: 'folder',
            nodeChild: [
                { nodeId: '05-01', nodeText: 'UI-Guide.pdf', icon: 'pdf' },
                { nodeId: '05-02', nodeText: 'Tutorials.zip', icon: 'zip' },
                { nodeId: '05-03', nodeText: 'Game.exe', icon: 'exe' },
                { nodeId: '05-04', nodeText: 'TypeScript.7z', icon: 'zip' },
            ]
        }
    ];
    let fields = { dataSource: hierarchicalData, id: 'nodeId', text: 'nodeText', child: 'nodeChild', iconCss: 'icon', imageUrl: 'image' };
    let allowDragAndDrop = true;
    let sortOrder = 'Ascending';
    function nodeDrag(args) {
        if (args.droppedNode != null && args.droppedNode.getElementsByClassName('folder') && args.droppedNode.getElementsByClassName('folder').length === 0) {
            args.dropIndicator = 'e-no-drop';
        }
    }
    function dragStop(args) {
        if (args.droppedNode != null && args.droppedNode.getElementsByClassName('folder') && args.droppedNode.getElementsByClassName('folder').length === 0) {
            args.cancel = true;
        }
    }
    return (<div className='control-pane'>
        <div className='control-section'>
        <div className='control_wrapper'>
            {/* Render TreeView */}
            <TreeViewComponent fields={fields} allowDragAndDrop={allowDragAndDrop} nodeDragStop={dragStop.bind(this)} nodeDragging={nodeDrag.bind(this)}/>
        </div>
        </div>
      </div>);
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));
import * as ReactDOM from 'react-dom';
import * as React from 'react';
import {TreeViewComponent, DragAndDropEventArgs} from '@syncfusion/ej2-react-navigations';
import {enableRipple} from '@syncfusion/ej2-base';
enableRipple(true);

function App() {

// Hierarchical data source for TreeView component
let hierarchicalData: { [key: string]: Object }[] = [
    {
            nodeId: '01', nodeText: 'Music', icon: 'folder',
            nodeChild: [
                { nodeId: '01-01', nodeText: 'Gouttes.mp3', icon: 'audio' }
            ]
        },
        {
            nodeId: '02', nodeText: 'Videos', icon: 'folder',
            nodeChild: [
                { nodeId: '02-01', nodeText: 'Naturals.mp4', icon: 'video' },
                { nodeId: '02-02', nodeText: 'Wild.mpeg', icon: 'video' },
            ]
        },
        {
            nodeId: '03', nodeText: 'Documents', icon: 'folder',
            nodeChild: [
                { nodeId: '03-01', nodeText: 'Environment Pollution.docx', icon: 'docx' },
                { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx', icon: 'docx' },
                { nodeId: '03-03', nodeText: 'Global Warming.ppt', icon: 'ppt' },
                { nodeId: '03-04', nodeText: 'Social Network.pdf', icon: 'pdf' },
                { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf', icon: 'pdf' },
            ]
        },
        {
            nodeId: '04', nodeText: 'Pictures', icon: 'folder', expanded: true,
            nodeChild: [
                {
                    nodeId: '04-01', nodeText: 'Camera Roll', icon: 'folder', expanded: true,
                    nodeChild: [
                        { nodeId: '04-01-01', nodeText: 'WIN_20160726_094117.JPG', image: 'https://ej2.syncfusion.com/demos/src/treeview/images/employees/9.png' },
                        { nodeId: '04-01-02', nodeText: 'WIN_20160726_094118.JPG', image: 'https://ej2.syncfusion.com/demos/src/treeview/images/employees/3.png' },
                    ]
                },
                { nodeId: '04-02', nodeText: 'Wind.jpg', icon: 'images' },
                { nodeId: '04-03', nodeText: 'Stone.jpg', icon: 'images' },
            ]
        },
        {
            nodeId: '05', nodeText: 'Downloads', icon: 'folder',
            nodeChild: [
                { nodeId: '05-01', nodeText: 'UI-Guide.pdf', icon: 'pdf' },
                { nodeId: '05-02', nodeText: 'Tutorials.zip', icon: 'zip' },
                { nodeId: '05-03', nodeText: 'Game.exe', icon: 'exe' },
                { nodeId: '05-04', nodeText: 'TypeScript.7z', icon: 'zip' },
            ]
        }
];
let fields: Object = { dataSource: hierarchicalData, id: 'nodeId', text: 'nodeText', child: 'nodeChild', iconCss: 'icon', imageUrl: 'image' };

let allowDragAndDrop: boolean = true;

let sortOrder: string = 'Ascending';

function nodeDrag(args: DragAndDropEventArgs): void {
   if (args.droppedNode != null && args.droppedNode.getElementsByClassName('folder') && args.droppedNode.getElementsByClassName('folder').length === 0) {
       args.dropIndicator = 'e-no-drop';
   }
}

function dragStop(args: DragAndDropEventArgs): void {
  if (args.droppedNode != null && args.droppedNode.getElementsByClassName('folder') && args.droppedNode.getElementsByClassName('folder').length === 0) {
    args.cancel = true;
  }
}

    return (
      <div className = 'control-pane'>
        <div className='control-section'>
        <div className='control_wrapper'>
            {/* Render TreeView */}
            <TreeViewComponent fields={fields} allowDragAndDrop={allowDragAndDrop} nodeDragStop={dragStop.bind(this)} nodeDragging={nodeDrag.bind(this)}/>
        </div>
        </div>
      </div>
    )
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));