Combobox

<select id="cc" class="easyui-combobox" name="dept" style="width:200px;">
    <option value="aa">aitem1</option>
    <option>bitem2</option>
    <option>bitem3</option>
    <option>ditem4</option>
    <option>eitem5</option>
</select>

<input id="cc" class="easyui-combobox" name="dept"
    data-options="valueField:‘id‘,textField:‘text‘,url:‘get_data.php‘">

<input id="cc" name="dept" value="aa">

$(‘#cc‘).combobox({
    url:‘combobox_data.json‘,
    valueField:‘id‘,
    textField:‘text‘
});

<input id="ddlDemo">

$("#ddlDemo").combobox({
        url:"/***/***",   
        editable: false, //不可编辑状态  
        //cache: false,
        panelHeight: "auto",//自动高度适合  
        valueField: "myid",
        textField: "myname",
        onSelect: function (rec) {
            var url = "...url...";
            $("#ddlDemo2").combobox("reload", url);//选择后触发事件，级联加载
        },
        onLoadSuccess: function (rec) {
            $("#ddlDemo").combobox("setValue", "请选择");//成功后的操作
        }
    });

$("#ddlDemo").combobox("select", "100136");//选择指定ID，并触发onSelect事件
$("#ddlDemo").combobox("setValue", "100136");//选择指定ID，不触发onSelect事件