(Proof of concept) Facade for HTML5 dataset attributes with fallback to data- attributes

gistfile1.txt

/**
 * Data attributes facade
 * 
 * @type {Object}
 */
var data = {
	/**
	 * Getter
	 * 
	 * @param  {Object} obj Element to query
	 * @param  {String} key Data attribute key
	 * @return {String} Data attribute value
	 */
	get : function(obj, key) {
		var value;

		switch (true) {
			case obj.hasOwnProperty("dataset") && key in obj.dataset:
				value = obj.dataset[key];
				break;
			case obj.hasOwnProperty("data-" + key):
				value = obj["data-" + key];
				break;
			default :
				value = "";
		}
		return value;
	},

	/**
	 * Setter
	 * 
	 * @param  {Object} obj   Element to receive data attribute
	 * @param  {String} key   Data attribute key
	 * @param  {Mixed}  value Data attribute value
	 * @return {Object} Data attribute value (for chaining values)
	 */
	set : function(obj, key, value) {
		obj.hasOwnProperty("dataset") ? obj.dataset[key] = value : obj["data-" + key] = value.toString();
		return value;
	}
};