Rails spinoffs - Mar 2008 - Execute my own javascript on Autocompleter functions

Because of some visual requirements for the div that contains the
autocomplete choices, I want to execute some javascript every time
updateChoices is executed. But I don''t want to modify controls.js to
avoid maintenance headaches. I started out with code like this:

    var _updateChoices = Autocompleter.Base.prototype.updateChoices;
    Autocompleter.Base.prototype.updateChoices = function(choices) {
        _updateChoices(choices);
    };

but I end up getting a "too much recursion" error.

Is there a clean way to do something like this?

Thanks,
dc
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You should try the wrap function technique...

Autocompleter.Base.prototype.updateChoices
Autocompleter.Base.prototype.updateChoices.wrap(
function(originalCall, choices){
  // do what you need to do before the call
  originalCall(choices);
  // do what you need to after the call
});

If your project is large enough, you may want to create a separate JS
file for extensions/overrides to make it easier to manage.

-justin

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Yeah, that''s it. Thanks for pointing out the function that I had
missed.

http://prototypejs.org/api/function/wrap

On Mar 18, 5:27 pm, "Justin Perkins"
<justinperk...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> You should try the wrap function technique...
>
> Autocompleter.Base.prototype.updateChoices >
Autocompleter.Base.prototype.updateChoices.wrap(
> function(originalCall, choices){
>   // do what you need to do before the call
>   originalCall(choices);
>   // do what you need to after the call
>
> });
>
> If your project is large enough, you may want to create a separate JS
> file for extensions/overrides to make it easier to manage.
>
> -justin
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