how to write client side events functions for the combobox items

<dx:ASPxComboBox ID="ASPxComboBox2" runat="server" ClientIDMode="AutoID" 
            SelectedIndex="-1" onselectedindexchanged="ASPxComboBox1_SelectedIndexChanged1" > 
        <ClientSideEvents SelectedIndexChanged="function(s, e) {
    grid.SelectRows();}" />            
                                 <Items>                                    
                                 <dx:ListEditItem Text="Selecte All Rows" /> 
                                 <dx:ListEditItem Text="UnselectAll" />                              
                                 </Items>
              </dx:ASPxComboBox>

I want to write event for the "unse开发者_如何学Pythonlect all" item in combobox. How can I do this?

You'll need to write a JavaScript function that iterates thru the combo-box and marks all selected items as false.

See Select/unselect all checkbox fields using pure Javascript and HTML for sample code

MSDN: Working with Client-Side Script

Use jQuery

$('input:checkbox').each( function() {
     this.checked = false;
});