Events Overview

This article lists the clients-side events of the RadMultiSelect and how to use them.

All events follow the MS AJAX client events convention and receive two arguments:

1. sender - the RadMultiSelect instance that raised the event
2. event arguments - event-specific data provided to the developer

RadMultiSelect is a wrapper over the Kendo UI MultiSelect widget and so it exposes the client events and data it does. You can find a list below.

The event data is wrapped according to the MS AJAX conventions and the fields you can see in the underlying Kendo Widget are avaliable through a method like get_<fieldName>() in the event arguments argument of the handler (that is, the second argument the event handler receives). To cancel an event, you must call its args.set_cancel(true); method.

The exceptions are the OnInitialize and OnLoad events that are specific to the MS AJAX framework.

Listing 1: The client-side events exposed by RadMultiSelect

• OnChange—Fired when the value of the widget is changed by the user.

• OnClose—Fired when the popup of the widget is closed. Cancellable.

• OnDataBound—Fired when the widget is bound to data from its data source.

• OnDeselect—Fired when an item is deselected or tag is removed.

• OnFiltering—Fired when the widget is about to filter the data source. Cancellable.

• OnInitialize—Fired just before the RadMultiSelect client-side object is initialized.

• OnLoad—Fired when RadMultiSelect is initialized.

• OnOpen—Fired when the popup of the widget is opened by the user. Cancellable.

• OnSelect—Fired when an item from the popup is selected by the user. Cancellable.

Examples

Example 1: Store a reference to the client-side object through the OnLoad event

<script>
    var multiSelect, kendoMultiSelect;
    function OnLoad(sender, args) {
        multiSelect = sender; //the RadMultiSelect
        kendoMultiSelect = sender.get_kendoWidget(); //the underlying Kendo MultiSelect
    }
</script>
<telerik:RadMultiSelect Skin="Default" runat="server" ID="RadMultiSelect1">
    <ClientEvents OnLoad="OnLoad" />
</telerik:RadMultiSelect>

Example 2: Get the data associated with the selected item

<script>
    function onSelect(sender, args) {
        var data = args.get_dataItem();
        console.log(data.ProductID);
    }
</script>

<telerik:RadMultiSelect RenderMode="Lightweight" ID="RadMultiSelect1" runat="server" DropDownHeight="200px" Width="400"
    DataSourceID="SqlDataSource1" DataTextField="ProductName" DataValueField="ProductID">
    <ClientEvents OnSelect="onSelect" />
</telerik:RadMultiSelect>
<asp:SqlDataSource runat="server" ID="SqlDataSource1" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    ProviderName="System.Data.SqlClient" SelectCommand="SELECT [ProductID], [ProductName] FROM [Products] ORDER By ProductName" />

Example 3: Cancel an event

<script>
    function OnOpen(sender, args) {
        var shouldCancel = true;//use actual business logic
        args.set_cancel(shouldCancel);//cancel the event
        //in this example, the dropdown will never open
    }
</script>
<telerik:RadMultiSelect Skin="Default" runat="server" ID="RadMultiSelect1">
    <ClientEvents OnOpen="OnOpen" />
</telerik:RadMultiSelect>

See Also

• Live Demo - Client-side Events

• RadMultiSelect Client-side Object