/**
 * Default value handler based on jQuery
 * - simply add the prompt='prompt text' to each input element you
 *  want to have a prompt on. In your page header add:
 *    jQuery(document).ready(function() { $.defaultvalue(); }
 * - The CSS class 'defaultvalue' is set on every element that has the defualt value
 * and removed when the value is no longer the default ot the user clicks on the field.
 * - On submit all elements with the defaultvalue class will be cleared so that server
 * scripts do not need additional logic to deal with presentation layer stuff.
 *
 * Sponsored by: Smartsheet.com
 *
 *
 * The MIT License
 * 
 * Copyright (c) 2008 Canfield Research Group (robb@canfield.com)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

(function($) {
	$.defaultvalue = function() {
		
		var elements = jQuery('input[prompt]');
		rtn = (
			elements.each(function() {				
				// Default values within scope
				var $el = jQuery(this);
				var def = $el.attr('prompt');
				
        // Set default value and class (if blank) 
        var blur = function() {
          if($el.val() == "" || $el.val() == def) {
            $el.addClass('defaultvalue');
            $el.val(def);
          }
        };
        // Remove default value and class
        var focus = function() {
					if($el.val() == def) {
						$el.val("");
					}
          $el.removeClass('defaultvalue');
        };

        // Trigger blur event
        blur();

        // Set functions per action
				$el.focus(focus);
				$el.blur(blur);
			})
		);

    // On all unique forms set the submit handler
    //  - Anything with a class of defaultvalue is assumed to have the defualt value!
    jQuery('form').submit(function(){
      jQuery(this).find('input.defaultvalue').val('');
    });

    return rtn;
	}
})(jQuery)