/**
 * see: http://github.com/jaz303/jquery-grab-bag/tree/master
 * Auxiliary element code based on work by pjesi (http://wtf.hax.is/)
 */
(function ($) {

    /**
     * Initialise input hints on all matched inputs.
     *
     * Usage examples:
     *
     * Add hints to all inputs with the 'title' attribute set:
     *   $('input[title],textarea[title]').inputHint();
     *
     * Add hints to all matched elements, grabbing the hint text from each element's
     * adjacent <kbd/> tag:
     *   $('input').inputHint({using: '+ kbd'});
     *
     * Options keys:
     *  using: jQuery selector locating element containing hint text, relative to
     *         the input currently being considered.
     *  hintAttr - tag attribute containing hint text. Default: 'title'
     *  hintClass - CSS class to apply to inputs with active hints. Default: 'hint'
     */
    $.fn.inputHint = function(options) {

        options = $.extend({hintClass: 'hint', hintAttr: 'title'}, options || {});

        function hintFor(element) {
            var h;
            if (options.using && (h = $(options.using, element)).length > 0) {
                return h.text();
            } else {
                return $(element).attr(options.hintAttr) || '';
            }
        }

        function showHint() {
            if ($(this).val() == '') {
                $(this).addClass(options.hintClass).val(hintFor(this));
            }
        }

        function removeHint() {
            if ($(this).hasClass(options.hintClass)) $(this).removeClass(options.hintClass).val('');
        }

    this.filter(function() { return !!hintFor(this); })
    .focus(removeHint).blur(showHint).blur();

    this.each(function() {
        var self = this;
        $(this).parents('form').submit(function() { removeHint.apply(self); });
    });

    return this.end(); // undo filter

};

})(jQuery);