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Prevent the Deletion of Selected MultiSelect Items on Backspace

Environment

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

Description

How can I prevent the deletion of selected items on a Backspace key-press in the Kendo UI MultiSelect widget?

Solution

The following example demonstrates how to achieve the desired scenario.

<select id="multiselect" multiple="multiple"></select>
    <script>
      var data = [
        { text: "Africa", value: 1 },
        { text: "Europe", value:2 },
        { text: "Asia", value:3 },
        { text: "North America", value:4 },
        { text: "South America", value:5 },
        { text: "Antarctica", value:6 },
        { text: "Australia", value:7 }
      ];

      $("#multiselect").kendoMultiSelect({
        dataSource: data,
        dataTextField: 'text',
        dataValueField: 'value'
      });

      var multiselect = $("#multiselect").data("kendoMultiSelect");

      var input = multiselect.input;

      input.on('keydown', function(e){
          if(e.which === 8 && !e.target.value.length){
            e.stopImmediatePropagation();  
            e.preventDefault();
          }
      });

      $._data(input[0]).events.keydown.reverse();
    </script>

See Also

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