Passing control's ID to javascript via ScriptControlDescriptor

I create a control in CreateChildControls():

Htm开发者_如何学编程lGenericControl mycontrol= HtmlGenericControl("li");
mycontrol.ID = "controlID";

controlId = mycontrol.ID;


protected virtual IEnumerable<ScriptDescriptor> GetScriptDescriptors()
{
        ScriptControlDescriptor descriptor = new ScriptControlDescriptor("Project.TEditor", this.ClientID);                   

        descriptor.AddProperty("controlId", controlId);           
        return new ScriptDescriptor[] { descriptor };          
}

Then in javascript i try to find this control using the ID property:

 alert($get(this.get_controlId()));

I get null because the actual control ID has a prefix that was added by asp.

How to solve that?

Try mycontrol.ClientID instead of mycontrol.ID for client side reference :

// At CreateChildControls : 
HtmlGenericControl mycontrol= HtmlGenericControl("li");
mycontrol.ID = "controlID";

// After you add your control to page (Page.Controls.Add(myControl)) : 
controlId = mycontrol.ClientID;

protected virtual IEnumerable<ScriptDescriptor> GetScriptDescriptors()
{
        ScriptControlDescriptor descriptor = new ScriptControlDescriptor("Project.TEditor", this.ClientID);                   

        descriptor.AddProperty("controlId", controlId);           
        return new ScriptDescriptor[] { descriptor };          
}