// Copyright (c) 2009 notions (http://www.notions.de)
// 
// 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.


var TextFieldHelper = Class.create();
TextFieldHelper.prototype = {
	placeholderClass: 'placeholder',
	
	initialize: function() {
	  $$('input[type="text"]').each(function(element) {
	    if ( element.hasAttribute('title') ) {
        element.observe('focus', this.onFocus.bind(this));
        element.observe('blur', this.onBlur.bind(this));
  
        var placeholder = element.getAttribute('title');
        if ($F(element) == placeholder) {
          element.addClassName(this.placeholderClass);
        }
      }
    }.bind(this));
	},
	
  onFocus: function(event) {
    var element = event.element();
    var placeholder = element.getAttribute('title');
    if ($F(element) == placeholder && element.hasClassName(this.placeholderClass) ) {
      element.setValue('');
      element.removeClassName(this.placeholderClass);
    }
	},

  onBlur: function(event) {
    var element = event.element();
    var placeholder = element.getAttribute('title');
    if ($F(element) == '') {
      element.setValue(placeholder);
      element.addClassName(this.placeholderClass);
    }
	}
};

document.observe("dom:loaded", function() {
  new TextFieldHelper();
});