Ext.form.ComboBox 动态加载数据后设置下拉选项

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//获取系统配置项下拉列表
function GetSysConfigComboBox(groupId, inputName, fieldLabel, value, disabled) {
    var store = new Ext.data.Store({
        proxy: new Ext.data.HttpProxy({ url: "SysConfigAction.ashx?action=list&groupid=" + groupId }),
        reader: new Ext.data.JsonReader(
                      { root: "" },
                      Ext.data.Record.create(["Value", "Remark"])
                      )
    });
    var combo = new Ext.form.ComboBox({
        store: store,
        hiddenName: inputName, //提交到后台的input名称
        valueField: 'Value',
        displayField: 'Remark', //store字段中你要显示的字段，多字段必选参数，默认当mode为remote时displayField为undefine，当select列表时displayField为"text"
        mode: 'local', //因为data已经取数据到本地了，所以'local',默认为"remote"，枚举完
        triggerAction: 'all', //很重要
        emptyText: '请选择...',
        editable: false,
        fieldLabel: fieldLabel   //设置表单中显示的标签
    });
    store.on('load', function() { //数据加载完成后设置下拉框值
        if (value)
            combo.setValue(value);
        combo.disabled = disabled;
    });
    store.load();
    return combo;
}