<script type="text/javascript">
    Ext.require(['*']);

    Ext.onReady(function () {
        var url = "/User/Detail2";
        var myStore = new Ext.data.Store({
            id: "myStoreId",
            proxy: new Ext.data.HttpProxy({ url: url }),
            reader: new Ext.data.reader.Json({ totalProperty: "totalProperty", root: "root", fields: [{ name: "ProductID" }, { name: "ProductName" }] })
        });
        myStore.load();
        var cb = new Ext.form.ComboBox({
            emptyText: '请选择商品...',
            renderTo: 'myCombo',
            displayField: 'ProductName',
            valueField: 'ProductID',
            mode: 'local',
            typeAhead: true,
            triggerAction: "all",
            emptyText: "请选择商品...",
            editable: false,
            allowBlank: false,
            blankText: "商品名称必须选择！",
            autoSelect: true,
            selectOnFoucus: true,
            store: myStore
        });
    });
</script>
<div id="myCombo"></div>