Yii框架 ajax案例

1、案例

2、说明：当下拉框出现变化的时候触发ajax

$("#selectitem").change(function(){
        var item = $("#selectitem").find("option:selected").text(); 
        item = item.replace(" ","_");      
        if(item != 'Please select...') {         
            document.getElementById("divcheckbox").innerHTML="";
            $("#divcheckbox").load('<?php echo Yii::app()->request->baseUrl; ?>/admin/news/gettrendgraph/'+item);
        }       
        var classify=$(this).val();
        $("#selecttagtwo").html("");
        $("#selecttagtwo").append("<option value='Please select...'>请选择...</option>");
        $.ajax({
          url:"<?php echo $this->createUrl('/admin/news/getcategorys')?>",
          type : "POST",
          data : {classify:classify},
          error : function(){alert('Error loading PHP document');},
          success: function(data){
            var data=eval('('+data+')');            
             $.each(data,function(i){
              $("#selecttagtwo").append("<option value="+data[i].id+">"+data[i].category_name+"</option>");
             });
          }
     });
});