Server side event on Clear

[Tauqir]

I want to execute some code on the server when the dropdowntree is cleared using the Clear button. How do I go about doing that? Thanks in advance.

[Kate]

Hello Tauqir,

Currently we do not have such server-side event of the RadDropDownTree control that you can use. However you can use the OnClientClearButtonClicked and the OnClientClearButtonClicking client side events.

Regards,
Kate
Telerik

[John]

Do you have any samples of how to implement this and triggering an event on the server side?

I have got something to work. I add a custom event argument like this:

function SectionComboBox_OnClientClearButtonClicked(sender, args) {
    __doPostBack('<%= rdtSectionId.UniqueID %>', 'ClearButtonClicked')
}

And then check for this on PostBack to fire my event:

if (Page.IsPostBack && Request.Form["__EVENTTARGET"] == rdtSectionId.UniqueID && Request.Form["__EVENTARGUMENT"] == "ClearButtonClicked")
{
    //fire my event
}

But this all seems a little messy.

Is there a better way?

Surely the EntryRemoved event should fire if you press the clear button and entries are removed as a result?

This control seems a little half-baked to me!

[Shinu]

Hi John,

Please have a look into the following code snippet to call the server side RadButton OnClick event from RadDropDownTree OnClientClearButtonClicked event.

ASPX:

<telerik:RadDropDownTree ID="RadDropDownTree1" runat="server" DataSourceID="SqlDataSource1"
    DataFieldID="id" DataFieldParentID="parentid" DataTextField="text" OnClientClearButtonClicked="OnClientClearButtonClicked1">
    <ButtonSettings ShowClear="true" />
</telerik:RadDropDownTree>
<telerik:RadButton ID="RadButton1" runat="server" Text="Click" OnClick="RadButton1_Click">
</telerik:RadButton>

JavaScript:

<script type="text/javascript">
    function OnClientClearButtonClicked1(sender, args) {
        var Button = $find("<%=RadButton1.ClientID %>");
        Button.click();
    }
</script>

C#:

protected void RadButton1_Click(object sender, EventArgs e)
{
    Response.Write("<script>alert('Fired');</script>");

}

Thanks,
Shinu.