Allow extensible behaviors when opening/closing menus

The D5 version will not receive any new features; only D6 will.

Firstly, I'm a bit dubious about using this Javascript visual stuff on a site for disabled users, because it is difficult for screen-readers and Braille displays to cope with it.

You can add this with Javascript in a specific theme, without having to modify the module code. Unfortunately playing sounds in Javascript is not something I'm familiar with.

There is a jQuery sound plugin.

http://dev.jquery.com/view/trunk/plugins/sound/

This will land in D7 first and might be backported later.

I've thought about this a few times and determined that the sound plugin of jQuery is so much extra code to include with DHTML menu that this feature won't make it into the "core" module. However, the module could well use a behaviors object (the same way Drupal has Drupal.behaviors) to bind custom actions to the two main DHTML events, opening and closing menus. This would involve perhaps 4-5 extra lines of Javascript in dhtml_menu.js that would be ignored if the extension is not used.

To extend, you would just need a custom JS file doing something like

Drupal.dhtmlMenu.events.myModule = {
  open:function(li) { plaSound(); }
};

Yes! This would be most useful, especially if back-ported to Drupal 6.

I'm currently looking at overriding Drupal.dhtmlMenu.toggleMenu, because unfortunately the slide effect also manipulates opacity. jQuery uses a filter to do this for IE 6 & 7, which turns text antialiasing off when the menu slides down. Not good - I need remove the opacity change, but keep the slide.

It would be more maintainable to roll my own jQuery behaviour and attach that, instead of overriding the entire function.

In 7.x-1.0 and 6.x-4.0, the animation effects (opacity, etc.) can be picked in the UI anyway, so there is no need to write any Javascript.