Extending the AutoComplete extender

I am trying to add more to the functionality of the AutoComplete extender. I would like to write my own and inherit from AutoCompleteExtender.

I would like to add a member variable that will hold the results from the last search ( similar to what the cache does, but just for the last search ) and then at a later point be able to compare a given string a see if it is one of the strings returned from the last search.

I am having trouble with the js. Any help would be appreciated

here is what my js file looks like, but I am not sure how to save the results from the last search.

Type.registerNamespace('CustomAutoCompleteControl');

CustomAutoCompleteControl.CustomAutoCompleteControlBehavior = function(element) {
CustomAutoCompleteControl.CustomAutoCompleteControlBehavior.initializeBase(this, [element]);
}

CustomAutoCompleteControl.CustomAutoCompleteControlBehavior.prototype = {

this._suggestions: null,

clearSuggestions: function() {
this._suggestions = null;
}
}

CustomAutoCompleteControl.CustomAutoCompleteControlBehavior.registerClass('CustomAutoCompleteControl.CustomAutoCompleteControlBehavior', Sys.Preview.UI.AutoCompleteBehavior);

I also created the .cs class and added the ClientScriptResource entry to make reference to the js file.

Do I need to overwrite the _update function, or what should I do to save the results? Any code would be helpful.

Thanks in advance

Looking at the AutoCompleteExtender, the completion list handles the mouseDown and Enter/Tab keypress events and calls a function by the name of setText which sets the textbox.

You may be able to use the existing property _currentPrefix...

_setText: function(text) {
this._timer.set_enabled(false);
this._currentPrefix = text;
var element = this.get_element();
var control = element.control;
// todo: should check for 'derives from' too and should somehow manually cause TB to raise property changed event
if (control && control.set_text) {
control.set_text(text);
}
else {
element.value = text;
}
this._hideCompletionList();
},

I would like to save the suggestions right before they are displayed to the user. There is a method called _update that is called which I think I would need to override, but I am not sure what the correct syntax to overriding a method is with this framework. Do I just rewrite that method the way I want it in my class and it will know to use that version for that method and the parent class' methods for the others? Do I need to override any other methods in order to make it work.

I think I have an idea on what I need to do, but the syntax is holding me back here. Any suggestions are appreciated.

Sorry, I misunderstood the first post. I thought you wanted to save the last finalized choice.