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Update MVVM-Bound Models on Loading the DropDownList

Environment

Product Progress Kendo UI DropDownList for jQuery
Operating System Windows 10 64bit
Visual Studio version Visual Studio 2017
Preferred Language JavaScript

Description

How can I update an MVVM-bound model on load in a Kendo UI DropDownList?

Solution

The following example demonstrates how to achieve the desired scenario.

  <div id="example">
    <div class="demo-section k-header">

      <div class="box-col">
        <h4>Choose a product e.g. 'Chai'</h4>
        <input data-role="dropdownlist"
               data-auto-bind="false"
               data-bound="updateModel"
               data-text-field="ProductName"
               data-value-field="ProductID"
               data-bind="value: selectedProduct,
                          source: products,
                          events: {
                          change: onChange,
                          open: onOpen,
                          close: onClose
                          }"
               style="width: 300px"
               /><button data-bind="click: onChange">click for selected value</button>
      </div>
      <div class="box-col console-section">
        <h4>Console</h4>
        <div class="console"></div>
      </div>
    </div>

    <script>
      function updateModel(e) {
        var widget = e.sender;

        setTimeout(function() {
          widget.trigger("change");
        });
      };

      var viewModel = kendo.observable({
        selectedProduct: null,
        displaySelectedProduct: function() {
          var selectedProduct = this.get("selectedProduct");
          return kendo.stringify(selectedProduct, null, 4);
        },
        onOpen: function() {
          $(".console").append("<p>event :: open</p>");
        },
        onChange: function() {
          $(".console").append("<p>event :: change (" + this.displaySelectedProduct() + ")</p>");
        },
        onClose: function() {
          $(".console").append("<p>event :: close</p>");
        },
        products: [{ProductName: "test title", ProductID: "1"}]
      });
      kendo.bind($("#example"), viewModel);
    </script>
  </div>

See Also

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