/**
 * Input Value
 * http://svn.latower.com/main/trunk/inputValue 
 *
 * Copyright (c) 2008 Gilles Ruppert (http://latower.com)
 * 
 * Version: 0.1
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * puts a string into an input field from the related label or
 * user defined in the script or already present in the label
 * inactive & active colours can be set
 * when user focuses on the field, the value disappears. If the user enters a value, it stays, 
 * else it switches back to the original value
 *
 * options are not compulsory
 * currently only works on text input fields
 *
 * Example:
 * $('input:text').inputValue({blurColor: '#666', focusColor: '#000', value:'whatever you want'});
 * 
 */


;(function($) {
  $.fn.autoInputLabel = function(options) {
    
    // setup defaults
    var defaults = {
      blurColor: '#666',
      focusColor: '#000',
      value: ''
    };
    
    // override defaults with user input
    defaults = $.extend(defaults, options);
    
    // helper functions
    // set up which value to use
    var setupValue = function(t) {
      
      // we use the value that is in the value attribute
      if (t.value !== '') {
        t.origValue = t.value;
        
      // else if the user provided a value we use that
      } else if (defaults.value !== '') {
				t.origValue = defaults.value;
      
      // else we use the label associated with it
      } else if ($('label[for=' + t.id + ']').length) {
        t.origValue = $('label[for=' + t.id + ']').text();
      } else {
        return false;
      }
			// assign the value to the value attribute
			t.value = t.origValue;
      return true;
    };
    
    // setup events
    var setupEvents = function(t) {
      var $t = $(t);
      $t.focus(function() {
        if (t.value === t.origValue) {
          $t.attr('value', '').css('color', defaults.focusColor);                
        }
      });
      $t.blur(function() {
        if ($t.attr('value') === '') {
          $t.attr('value', t.origValue).css('color', defaults.blurColor);
        }
      });
    };
    
    // constructor
    // setup the jQuery object
    this.each(function() {
      if (this.type === 'text') {            
        // if we have a value we set everything up
        if (setupValue(this)) {
          $(this).css('color', defaults.blurColor);
          setupEvents(this);
        }
      }
    });

    return this;
  };
})(jQuery);