/*
 * jQuery selectRelation plugin
 * Version: 0.1.0
 *
 * Copyright (c) 2008 Alexander Smalle
 *
 * Dual licensed under the MIT and GPL licenses
 *
 *
 * Changelog:
 * v 0.1.0 - 2008-04-28
 *
 * Todo:
 * - handle special chars ',".. in value
 */


(function($) {
  jQuery.fn.selectRelation = function(settings) {
    settings = jQuery.extend({
    version: "0.1.0"
    }, settings);
    var selectRelationContainterList=this;
    return selectRelationContainterList.each(function(){
      var selectRelationContainterDomElem = this;
      jQuery('.parent').each(function() {
        var parent=jQuery(this).attr('id');

        jQuery('.child_' + parent, selectRelationContainterDomElem).each(function(index) {
          var childDomElem = $(this);
          var child=childDomElem.attr('id');
          var relationMap = {};
          var childSelectedValue=$('#'+child).attr('value');
          childSelectedValue = (typeof childSelectedValue == "undefined")? "" : childSelectedValue;
          jQuery("#"+child+" option").each( function(i) {
              var myKey=jQuery(this).attr('alt');
              var myValue=jQuery(this).attr('value');
              var myLabel=jQuery(this).html();
              myValue = (typeof myValue == "undefined")? "" : myValue;
              myLabel = (typeof myLabel == "undefined")? "" : myLabel;
              if (relationMap[myKey] == undefined) {
                relationMap[myKey]= [{value:myValue, label:myLabel}]; // new array
              } else {
                relationMap[myKey].push( {value:myValue, label:myLabel} );
              }
            }
          );
          var parentValue = jQuery('#'+parent).attr('value');
          $('#'+child).html(''); //empty
          if (relationMap['selectRelation_'+parentValue] != undefined) {
            for(var i = 0; i < relationMap['selectRelation_'+parentValue].length; i++) {
              $('#'+child).append('<option value=\''+relationMap['selectRelation_'+parentValue][i].value+'\'>'+relationMap['selectRelation_'+parentValue][i].label+'</option>');
            }
            $("#"+child+' option[@value="'+ childSelectedValue +'"]').attr('selected','selected');
          }
          var childValue = $('#'+child).attr('value');
          $('#'+parent).change(
            function() {
              var parentValue = $('#'+parent).attr('value');
              $('#'+child).html(''); //empty
              if (relationMap['selectRelation_'+parentValue] != undefined) {
                for(var i = 0; i < relationMap['selectRelation_'+parentValue].length; i++) {
                  $('#'+child).append('<option value=\''+relationMap['selectRelation_'+parentValue][i].value+'\'>'+relationMap['selectRelation_'+parentValue][i].label+'</option>');
                }
                $("#"+child+' option[@value="'+ childSelectedValue +'"]').attr('selected','selected');
              }
              $('#'+child).trigger("change");
              $('#'+child).focus();
          });
        });


      });
    });
  };
})(jQuery);