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Load list items in child list dynamically

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.

Source
Preview
index.tsx
index.html
index.css
import * as React from 'react';
import * as ReactDOM from "react-dom";
import { ListViewComponent } from '@syncfusion/ej2-react-lists';

export default class App extends React.Component<{}, {}> {
  // define the array of Json
  private 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" }
      ]
    }
  ];
  private fields: { [key: string]: Object } = { iconCss: "icon", tooltip: "text" };

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

  render() {
    return (
      <div>
        <ListViewComponent
          id="listview"
          dataSource={this.data}
          fields={this.fields}
          headerTitle="Folders"
          showIcon={true}
          showHeader={true}
          select={this.onSelect.bind(this) as any}
        />
      </div>
    );
  }
}

ReactDOM.render(<App />, document.getElementById('element'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ListView</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-lists/styles/material.css" rel="stylesheet" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='element' style="margin:0 auto; max-width:400px;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>
#listview {
  display: block;
  max-width: 400px;
  margin: auto;
  border: 1px solid #dddddd;
  border-radius: 3px;
}


#listview.e-listview .e-list-icon {
  height: 24px;
  width: 30px;
}

.folder, .file  {
  background: url('https://ej2.syncfusion.com/demos/src/listview/images/file_icons.png') no-repeat;
  background-size: 300%;
}

.folder{    
  background-position: -5px -461px;
}

.file {
  background-position: -5px -151px;
}
/* csslint ignore:start */

.list {
  color:deeppink !important;
}
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