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LoadOnDemand

configuration

Indicates whether the child DataSources should be fetched lazily when parent groups get expanded. Setting this to false causes all child DataSources to be loaded at initialization time.

Note: when initializing the widget from an array (rather than from a HierarchicalDataSource instance), this option defaults to false, rather than true.

loadOnDemand

Boolean

Default: true

<div id="treeview"></div>
<script>
  var serviceRoot = "https://demos.telerik.com/service/v2/core";
  homogeneous = new kendo.data.HierarchicalDataSource({
    transport: {
      read: {
        url: serviceRoot + "/Employees"
      }
    },
    schema: {
      model: {
        id: "EmployeeId",
        hasChildren: "HasEmployees"
      }
    }
  });

  $("#treeview").kendoTreeView({
    dataSource: homogeneous,
    loadOnDemand: false,
    dataTextField: "FullName"
  });
</script>