[django] uncollapse all collapsible fieldsets

uncollapse_all.js

/**
 * Provides the function 'uncollapse_all' that expands/uncollapses all
 * unexpanded/uncollapsed fieldsets.
 *
 * Known to work with django 1.2<=, <=1.3.0a0.
 */
django.jQuery(document).ready(function($) {
	var e = $("fieldset.collapse a.collapse-toggle");

	// obtain the jquery click handler that toggles the groups; we assume
	// that the first handler is that
	var fn = $.data(e[0]).events['click'][0].handler;

	// if odd, the group is shown - trigger the handler to hide it.
	var filter = function() {
		return ($.data(this, "lastToggle"+fn.guid) || 0) % 2;
	};

	var handler = function() { $(this).trigger('click'); }

	uncollapse_all = function() {
		e.filter(filter).each(handler);
		return false;
	};
});