Load List Items in child list dynamically

11 Feb 202512 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 control. 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.

CSHTML

@using Syncfusion.EJ2
@using Syncfusion.EJ2.Lists

<ejs-listview id="listview" dataSource="(IEnumerable<object>)ViewBag.dataSource" select="onSelect" showIcon="true" showHeader="true" headerTitle="Folders">
    <e-listview-fieldsettings iconCss="icon" tooltip="text"></e-listview-fieldsettings>
</ejs-listview>

<style>
    #listview {
        display: block;
        max-width: 350px;
        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: 302%;
    }

    .folder {
        background-position: -5px -466px;
    }

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

    .new-list {
        color: deeppink !important;
    }

    /* csslint ignore:end */
</style>

<script>
    //Select event to add new list item in child page
    function onSelect(args) {
        //Add new file to the child page of selected list item
        this.dataSource[args.index].child.push({ id: '01-02', text: 'Newly Added File', icon: 'file', htmlAttributes: { role: 'li', class: 'new-list' } });
    }
</script>

List.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace WebApplication1.Controllers
{
    public class ListViewController : Controller
    {
        public IActionResult list()
        {   
            List<object> listdata = new List<object>();
            listdata.Add(new
            {
                id = "01",
                text = "Music",
                icon = "folder",
                child = new List<object>() { new { id = "01-01", text = "Gouttes.mp3", icon = "file" } }
            });
            listdata.Add(new
            {
                id = "02",
                text = "Videos",
                icon = "folder",
                child = new List<object>() {
                   new { id= "02-01", text= "Naturals.mp4", icon= "file" },
                   new { id= "02-02", text= "Wild.mpeg", icon= "file" },
                }
            });
            listdata.Add(new
            {
                id = "03",
                text = "Documents",
                icon = "folder",
                child = new List<object>() {
                   new { id= "03-01", text= "Environment Pollution.docx", icon= "file" },
                   new { id= "03-02", text= "Global Water, Sanitation, & Hygiene.docx", icon= "file" },
                   new { id= "03-03", text= "Global Warming.ppt", icon= "file" },
                   new { id= "03-04", text= "Social Network.pdf", icon= "file" },
                   new { id= "03-05", text= "Youth Empowerment.pdf", icon= "file" }
               }
            });

            listdata.Add(new
            {
                id = "04",
                text = "Pictures",
                icon = "folder",
                child = new List<object>() {
                   new {
                        id= "04-01", text= "Camera Roll", icon= "folder",
                        child= new List<object>() {
                          new  { id= "04-01-01", text= "WIN_20160726_094117.JPG", icon= "file" },
                           new { id= "04-01-02", text= "WIN_20160726_094118.JPG", icon= "file" },
                           new { id= "04-01-03", text= "WIN_20160726_094119.JPG", icon= "file" }
                        }
                    },
                 new   {
                        id= "04-02", text= "Wind.jpg", icon= "file"
                    },
                  new  {
                        id= "04-02", text= "Stone.jpg", icon= "file"
                    },
                 new   {
                        id= "04-02", text= "Home.jpg", icon= "file"
                    },
                  new  {
                        id= "04-02", text= "Bridge.png", icon= "file"
                    }
             }
            });
            listdata.Add(new
            {

                id = "05",
                text = "Downloads",
                icon = "folder",
                child = new List<object>() {
                   new { id= "05-01", text= "UI-Guide.pdf", icon= "file" },
                   new  { id= "05-02", text= "Tutorials.zip", icon= "file" },
                   new  { id= "05-03", text= "Game.exe", icon= "file" },
                   new { id= "05-04", text= "TypeScript.7z", icon= "file" },
               }
            });
            ViewBag.dataSource = listdata;
            return View();
        }       
    }
}