Ajax+Json 级联菜单实现代码

<select id=”select” name=”rawfoodBasic.category” onchange=”doChange(this.value);”>

//第一个下拉框里的值

</select>

<select id=”subSelect” name=”rawfoodBasic.absorb” onchange=”javascript:alert(this.value);” > //要3及菜单还可以在次写相应的时间

<option value=”0″>–请选择二级菜单– </option>

</select>

<script type=”text/javascript”>

$.ajaxSetup({

cache:false

}); //清除ajax中之前的值

function doChange(obj){

var url = ‘<c:url value=”/nutrition/getSubDictDataToJsonByCategory.action”/>’+”?rawfood.category=”+obj;//第一个下拉框选中后进入的action,action中给第二个下拉框所需的值赋值

$.getJSON(url,function(json){

var seleOjb=document.getElementById(“subSelect”);

for(var k=0;k<seleOjb.options.length;k++){

seleOjb.options.remove(k); //当再选中第一个下拉框中的值时,把第二个下拉框中原来的值清除

}

$.each(json.subCategoryDictList,function(index,subDictData){

var optionj=document.createElement(“option”); //为第二个下拉框赋值

optionj.value = subDictData.id;

//alert(subDictData.id);

optionj.text=subDictData.name;

seleOjb.add(optionj);

});

});

}

</script>

<action name=”getSubDictDataToJsonByCategory” class=”rawfoodAction” method=”getSubDictDataToJsonByCategory”>

<result name=”success” type=”json”>

<param name=”includeProperties”> //定义返回的参数

^subCategoryDictList\[\d+\]\.id,

^subCategoryDictList\[\d+\]\.name

</param>

</result>

</action>