Passing values to behavior properties

Swedish version of this entry

Typically a property in a AjaxControlToolkit Extender looks like this:

[ExtenderControlProperty]
[DefaultValue("")]
public string MyProperty
{
  get { ... }
  set { ... }
}

Which will match a property in the behavior:

get_MyProperty : function() { ... },
set_MyProperty : function(value) { ... }

Values for MyProperty on the server side will end up in the behavior. Sometimes you want to pass values to the behavior without creating a property in the Extender control. To do this, simply override RenderScriptAttributes() and add the properties using AddProperty().

protected override void RenderScriptAttributes(ScriptBehaviorDescriptor descriptor)
{
  base.RenderScriptAttributes(descriptor);
  string horizontalAlignment=GetHorizontalAlignment();
  descriptor.AddProperty("HorizontalAlignment", horizontalAlignment);
}

And voilà, the HorizontalAlignment property in the beahvior will be set.