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Show Lines between the TreeView Nodes

Environment

Product	Progress® Kendo UI® TreeView for jQuery
Operating System	Windows 10 64bit
Visual Studio Version	Visual Studio 2017
Preferred Language	JavaScript

Description

How can I show lines between the nodes of the Kendo UI for jQuery TreeView?

Solution

Depending on the TreeView rendering and styling options that you use, apply either the solution for the new rendering or the old rendering.

New Rendering

The following example demonstrates how to achieve the desired scenario.

    <div id="treeview"></div>

    <script>
          $("#treeview").kendoTreeView({
            dataSource: [
              { text: "Furniture", items: [
                { text: "Tables & Chairs" },
                { text: "Sofas" },
                { text: "Occasional Furniture" }
              ] },
              { text: "Decor", items: [
                { text: "Bed Linen" },
                { text: "Curtains & Blinds" },
                { text: "Carpets" }
              ] }
            ]
          });
    </script>

   
      
    <style>
      body {
        font-size: 12px;
      }

      .k-treeview .k-treeview-top,
      .k-treeview .k-treeview-mid,
      .k-treeview .k-treeview-bot {
        background-image: url('https://d35islomi5rx1v.cloudfront.net/mvc/2012.2.607/Default/treeview-nodes.png');
        background-repeat: no-repeat;
        margin-left: -16px;
        padding-left: 16px;
      }

      .k-treeview .k-treeview-item { background-image: url('https://d35islomi5rx1v.cloudfront.net/mvc/2012.2.607/Default/treeview-line.png'); }
      .k-treeview .k-treeview-last { background-image: none; }


      .k-treeview .k-treeview-top { background-position: -91px 0; }
      .k-treeview .k-treeview-bot { background-position: -69px -22px; }
      .k-treeview .k-treeview-mid { background-position: -47px -44px; }
      .k-treeview .k-treeview-last .k-treeview-top { background-position: -25px -66px; }
      .k-treeview .k-treeview-group .k-treeview-last .k-treeview-bot { background-position: -69px -22px; }

      .k-treeview .k-treeview-item {
        background-repeat: no-repeat;
      }

      .k-treeview .k-treeview-first {
        background-repeat: no-repeat;
        background-position: 0 16px;
      }

    </style>

Old Rendering

This Dojo demonstrates how to achieve the behavior with versions earlier than R1 2022