/*
* (c) 2008-9 Jason Frame
* 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();
 
        var $form = this.parents('form:eq(0)');
        this.each(function() {
            var self = this;
            $form.submit(function() { removeHint.apply(self); });
        });
 
    return this.end(); // undo filter
 
  };
  
})(jQuery);