This jquery plugin allows bulk editing of classes on elements. Use like: $('#myelement').changeClass('+one -two !three'); This unconditionally adds class `one`, unconditionally removes class `two`, and toggles class `three`

bulk_class_edit.js

/*
 //@ sourceURL=static/js/lib/jquery.hacks.js
 *
 * from https://github.com/umdjs/umd/blob/master/jqueryPlugin.js
 */
(function(factory) {
	if ( typeof define === 'function' && define.amd) {
		// AMD. Register as an anonymous module.
		define(['jquery'], factory);
	} else {
		// Browser globals
		factory(jQuery);
	}
}(function($) {
	$.fn.changeClass = function(classes_string) {
		var parts = classes_string.split(' ');
		
		var worker_fn = function(el) { return $(el); };
		var add_fn = function(c, action) { return function(el) { return action(el).addClass(c);	}; };
		var remove_fn = function(c, action) { return function(el) { return action(el).removeClass(c); }; };
		var toggle_fn = function(c, action) { return function(el) { return action(el).toggleClass(c); }; };
		$.each(parts, function() {
			var c = this[0];
			var action = add_fn;
			var klass = this;
			if (c == '-' || c == '+' || c == '!') {
				action = (c == '-' ? remove_fn : (c == '!' ? toggle_fn : add_fn));
				klass = this.slice(1);
			}
			
			worker_fn = action(klass, worker_fn);
		});
		
		return this.each(function() {
			return worker_fn(this);
		});
	};
}));