怎么向Ext.form.ComboBox中赋值

[tjzero_sapce]

setCredit = function(gridObject){
			var parEval;
			var record = gridObject.getSelectionModel().getSelected();
			partyName.setValue( record.get('partyName') );
			partyIdHiddenId.setValue( record.get('partyId') );
			Ext.Ajax.request({
				url : BASE_PATH + "/contract/InitCredit.action?partyEval.id="+partyEval.id,
				method: "GET",
				params: {partyId: record.get('partyId'), contId: cont.id, busiType: 'SlawContractAlter'},   
				async: false,     
				success:function(response, options){
					parEval = eval("(" + response.responseText + ")")['partyEval'];
				},
				scope: this
			});
			busiTypeHidden.setValue(parEval.busiType);
			gradeType.setValue(parEval.gradeName); 
			gradeType.hiddenValue = parEval.gradeId,
//			gradeType.emptyText = parEval.gradeName,
			alert(gradeType.hiddenValue);
			demo.setValue(parEval.demo);
			evalIdHiddenId.setValue(parEval.id);
		}
		// 查询信用度级别map
		var gradeStore = new Ext.data.Store({
			proxy : new Ext.data.HttpProxy({
				url : '/SLaw/common/QueryListByMap.action?propertyName=getCreditLevel'
			}),
			reader : new Ext.data.JsonReader(
				{root : 'dictList'}, 
				['dictId', 'dictName']
				)
		});
		gradeStore.load();
		
		var gradeType = new Ext.form.ComboBox ({
			fieldLabel: '信用等级',
			allowBlank: false,
			blankText: "不能为空，请填写",
			emptyText: '请选择..',//提示字符串  
			triggerAction: 'all',//点击下拉按钮全部显示
			mode:'local',
			editable : false,
			store: gradeStore,
			valueField:'dictId',
	        displayField: "dictName",
	        hiddenName : 'partyEval.gradeId',
	        value: partyEval.gradeName,
			hiddenValue: partyEval.gradeId,
			anchor: '80%'
		});

这种赋值方法 在编辑过程中 如果没有重新选择Ext.form.ComboBox中的选项 直接提交保存 就会报错，怎么办呢？

[lsw645645645]

有点没看懂，报什么错啊

[tjzero_sapce]

自己用这种方法解决了额

gradeType.setValue(parEval.gradeName); 
			gradeType.hiddenValue = parEval.gradeId,

[zs_012]

在ComboBox初始化时加个隐藏控件hiddenName: 'SelectId'
代码如下：
Ext.onReady(function () {
var combo = new Ext.form.ComboBox({
store: store,
hiddenName: 'SelectId',
valueField: 'id',
displayField: 'title',
typeAhead: true,
mode: 'local',
forceSelection: true,
triggerAction: 'all',
emptyText: '请选择',
selectOnFocus: true,
applyTo: 'local-states'

});

获取ComboBox隐藏值：代码如下
<input id="Button1" type="button" value="button" onclick="alert(Ext.get('SelectId').getValue());" />