一:预定义结构的 select 元素创建组合框(combobox)值固定写死
<select class="easyui-combobox" name="state" style=" 200px;"> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> <option value="AR">Arkansas</option> <option value="CA">California</option> <option value="CO">Colorado</option> </select>
效果图:

二:使用 javascript 创建组合框(combobox) 动态加载
<input id="cc" name="dept" value="aa">
JS代码:
$('#cc').combobox({
url: 'test_list.aspx?id=1',
valueField: 'id',
textField: 'text'
});
C#后台代码:
protected void Page_Load(object sender, EventArgs e) { if (Request["id"] == "1") { string josn = "[{ " + " "id":1, " + " "text":"text1" " + "},{ " + " "id":2, " + " "text":"text2" " + "},{ " + " "id":3, " + " "text":"text3", " + " "selected":true " + "},{ " + " "id":4, " + " "text":"text4" " + "},{ " + " "id":5, " + " "text":"text5" " + "}] "; Response.Clear(); Response.Write(josn); Response.End(); } }
效果图:

三:创建两个依赖的组合框(combobox) 联动效果:
<input id="cc1" class="easyui-combobox" data-options=" valueField: 'id', textField: 'text', url: 'test_list.aspx?id=1', onSelect: function(rec){ var url = 'test_list.aspx?id='+rec.id; $('#cc2').combobox('reload', url); }"> <input id="cc2" class="easyui-combobox" data-options="valueField:'id',textField:'text'"></div>
JS获取combobox值
//取ID $('#cc').combobox('getValue'); //取显示的name $('#cc').combobox('getText');