Load list items in child list dynamically in React Listview component

30 Jan 202317 minutes to read

To load list items in child list dynamically, push the new list item data into the existing dataSource using
the select event.

Refer to the following steps to load list item into the child list:

  1. Initially, render the ListView with the required data source.

  2. Bind the select event that triggers selecting list item in the ListView component. By using the select event, you can push the new list item to the child list of the data source on specifying its item index. Item index can be obtained from the SelectEventArgs of the select event.

import * as React from 'react';
import * as ReactDOM from "react-dom";
import { ListViewComponent } from '@syncfusion/ej2-react-lists';
function App() {
    // define the array of Json
    let data = [
        {
            id: "01",
            text: "Music",
            icon: "folder",
            child: [{ id: "01-01", text: "Gouttes.mp3", icon: "file" }]
        },
        {
            id: "02",
            text: "Videos",
            icon: "folder",
            child: [
                { id: "02-01", text: "Naturals.mp4", icon: "file" },
                { id: "02-02", text: "Wild.mpeg", icon: "file" }
            ]
        },
        {
            id: "03",
            text: "Documents",
            icon: "folder",
            child: [
                { id: "03-01", text: "Environment Pollution.docx", icon: "file" },
                { id: "03-02", text: "Global Water, Sanitation, & Hygiene.docx", icon: "file" },
                { id: "03-03", text: "Global Warming.ppt", icon: "file" },
                { id: "03-04", text: "Social Network.pdf", icon: "file" },
                { id: "03-05", text: "Youth Empowerment.pdf", icon: "file" }
            ]
        },
        {
            id: "04",
            text: "Pictures",
            icon: "folder",
            child: [
                {
                    id: "04-01",
                    text: "Camera Roll",
                    icon: "folder",
                    child: [
                        { id: "04-01-01", text: "WIN_20160726_094117.JPG", icon: "file" },
                        { id: "04-01-02", text: "WIN_20160726_094118.JPG", icon: "file" },
                        { id: "04-01-03", text: "WIN_20160726_094119.JPG", icon: "file" }
                    ]
                },
                {
                    id: "04-02",
                    text: "Wind.jpg",
                    icon: "file"
                },
                {
                    id: "04-02",
                    text: "Stone.jpg",
                    icon: "file"
                },
                {
                    id: "04-02",
                    text: "Home.jpg",
                    icon: "file"
                },
                {
                    id: "04-02",
                    text: "Bridge.png",
                    icon: "file"
                }
            ]
        },
        {
            id: "05",
            text: "Downloads",
            icon: "folder",
            child: [
                { id: "05-01", text: "UI-Guide.pdf", icon: "file" },
                { id: "05-02", text: "Tutorials.zip", icon: "file" },
                { id: "05-03", text: "Game.exe", icon: "file" },
                { id: "05-04", text: "TypeScript.7z", icon: "file" }
            ]
        }
    ];
    let fields = { iconCss: "icon", tooltip: "text" };
    function onSelect(args) {
        data[args.index].child.push({
            id: "01-02",
            text: "Newly Added File",
            icon: "file",
            htmlAttributes: { role: "li", class: "list" }
        });
    }
    return (<div>
      <ListViewComponent id="listview" dataSource={data} fields={fields} headerTitle="Folders" showIcon={true} showHeader={true} select={onSelect.bind(this)}/>
    </div>);
}
export default App;
ReactDOM.render(<App />, document.getElementById('element'));
import * as React from 'react';
import * as ReactDOM from "react-dom";
import { ListViewComponent } from '@syncfusion/ej2-react-lists';

function App() {
  // define the array of Json
  let data: { [key: string]: Object }[] = [
    {
      id: "01",
      text: "Music",
      icon: "folder",
      child: [{ id: "01-01", text: "Gouttes.mp3", icon: "file" }]
    },
    {
      id: "02",
      text: "Videos",
      icon: "folder",
      child: [
        { id: "02-01", text: "Naturals.mp4", icon: "file" },
        { id: "02-02", text: "Wild.mpeg", icon: "file" }
      ]
    },
    {
      id: "03",
      text: "Documents",
      icon: "folder",
      child: [
        { id: "03-01", text: "Environment Pollution.docx", icon: "file" },
        { id: "03-02", text: "Global Water, Sanitation, & Hygiene.docx", icon: "file" },
        { id: "03-03", text: "Global Warming.ppt", icon: "file" },
        { id: "03-04", text: "Social Network.pdf", icon: "file" },
        { id: "03-05", text: "Youth Empowerment.pdf", icon: "file" }
      ]
    },
    {
      id: "04",
      text: "Pictures",
      icon: "folder",
      child: [
        {
          id: "04-01",
          text: "Camera Roll",
          icon: "folder",
          child: [
            { id: "04-01-01", text: "WIN_20160726_094117.JPG", icon: "file" },
            { id: "04-01-02", text: "WIN_20160726_094118.JPG", icon: "file" },
            { id: "04-01-03", text: "WIN_20160726_094119.JPG", icon: "file" }
          ]
        },
        {
          id: "04-02",
          text: "Wind.jpg",
          icon: "file"
        },
        {
          id: "04-02",
          text: "Stone.jpg",
          icon: "file"
        },
        {
          id: "04-02",
          text: "Home.jpg",
          icon: "file"
        },
        {
          id: "04-02",
          text: "Bridge.png",
          icon: "file"
        }
      ]
    },
    {
      id: "05",
      text: "Downloads",
      icon: "folder",
      child: [
        { id: "05-01", text: "UI-Guide.pdf", icon: "file" },
        { id: "05-02", text: "Tutorials.zip", icon: "file" },
        { id: "05-03", text: "Game.exe", icon: "file" },
        { id: "05-04", text: "TypeScript.7z", icon: "file" }
      ]
    }
  ];
  let fields: { [key: string]: Object } = { iconCss: "icon", tooltip: "text" };

  function onSelect(args: SelectEventArgs) {
    (data[args.index].child as any[]).push({
      id: "01-02",
      text: "Newly Added File",
      icon: "file",
      htmlAttributes: { role: "li", class: "list" }
    });
  }

  return (
    <div>
      <ListViewComponent
        id="listview"
        dataSource={data}
        fields={fields}
        headerTitle="Folders"
        showIcon={true}
        showHeader={true}
        select={onSelect.bind(this) as any}
      />
    </div>
  );
}
export default App;
ReactDOM.render(<App />, document.getElementById('element'));