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Expand All TreeView Nodes upon Check

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 expand all child nodes when checking a root node in the Kendo UI for jQuery TreeView?

Solution

The following example demonstrates how to achieve the desired scenario.

  <div id="tree"></div>

  <script>
    $("#tree").kendoTreeView({
      checkboxes: {
        checkChildren: true
      },
      check: function(e) {
        this.expandRoot = e.node;

        this.expand($(this.expandRoot).find(".k-item").addBack());
      },
      dataBound: function(e) {
        if (this.expandRoot) {
          this.expand(e.node.find(".k-item"));
        }
      },

      // mocked datasource for the example
      dataSource: {
        transport: {
          read: function(options) {
            if (!window.counter) window.counter = 1;

            // stub server
            setTimeout(function() {
              if (counter < 20) {
                options.success([
                  { text: "item " + (counter++) },
                  { text: "item " + (counter++) },
                  { text: "item " + (counter++), hasChildren: false }
                ]);
              } else {
                options.success([]);
              }
            }, 500);
          }
        },
        schema: {
          model: {
            id: "id",
            hasChildren: "hasChildren"
          }
        }
      }
    });
  </script>

See Also

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