ASPxClientListBox.SelectedIndexChanged Event

Occurs on the client side after a different item in the list box has been selected (focus has been moved from one item to another).

Declaration

SelectedIndexChanged: ASPxClientEvent<ASPxClientListEditItemSelectedChangedEventHandler<ASPxClientListBox>>

Event Data

The SelectedIndexChanged event's data class is ASPxClientListEditItemSelectedChangedEventArgs. The following properties provide information specific to this event:

Property	Description
index	Gets the index of the item related to the event.
isSelected	Gets whether the item has been selected.
processOnServer	Specifies whether or not to process the event on the server. Inherited from ASPxClientProcessingModeEventArgs.

Remarks

The SelectedIndexChanged event occurs on the client side whenever selection is moved between items within the list box editor. Write a handler for the SelectedIndexChanged event to perform tasks in response to an end-user selecting a different item from the editor’s list.

Note that the ASPxClientListEditItemSelectedChangedEventArgs.index property value is -1 when the “Select All” check box is clicked.

Example

This part of the Multiple Selection demo illustrates how to use multi-selection mode for the ASPxListBox editor.

ASPX

<dx:ASPxListBox ID="lbFeatures" runat="server" SelectionMode="CheckColumn" Height="210px"
    DataSourceID="Features" ValueField="ID" ValueType="System.String" TextField="Name">
    <ClientSideEvents SelectedIndexChanged="function(s, e) {lbModels.PerformCallback('1');}" />
</dx:ASPxListBox>
<dx:ASPxListBox ID="lbModels" runat="server" SelectionMode="CheckColumn" 
Height="210px" width="250px" ClientInstanceName="lbModels" 
DataSourceID="PhoneModels" ValueField="ID" ValueType="System.String" 
OnCallback="lbModels_Callback" >
   <Columns>
      <dx:ListBoxColumn FieldName="Name" Caption="Model" width="100%"/>
      <dx:ListBoxColumn FieldName="Price" width="50px"/>
   </Columns>
</dx:ASPxListBox>

C#

protected void lbModels_Callback(object sender, DevExpress.Web.CallbackEventArgsBase e) {
    FilterModels(lbFeatures.Items);
    lbModels.DataBind();
}
protected void FilterModels(ListEditItemCollection items) {
...     
}
...

VB.NET

Protected Sub lbModels_Callback(ByVal sender As Object, ByVal e As DevExpress.Web.CallbackEventArgsBase)
    FilterModels(lbFeatures.Items)
    lbModels.DataBind()
End Sub

Protected Sub FilterModels(ByVal items As ListEditItemCollection)
' ...
End Sub