extjs3EmptyText 上传自动清空的问题

在extjs3表单的操作中，输入框经常有提示性的默认字段，比如：

// === 接入单位的Form表单 ======
var jrdwForm = new Ext.form.FormPanel({
border : false,
frame : true,
autoScroll : true,
labelAlign : 'right',
labelWidth : 90,
width: 460,
defaults : {
xtype : "textfield",
width : 300,
allowBlank : true
},
items:[
new Ext.form.ComboBox({
fieldLabel:'部门网络位置<font color="red">*</font>',
hiddenName:'NWW',
name:'nww2',
id:'nww_param1',
store:jrdw_nww_store,mode :'local',
displayField:'displayValue',valueField :'value',
width:300,value:1,
triggerAction: 'all'
}),
{fieldLabel:'部门名称<font color="red">*</font>',name:'BMMC',allowBlank:false,maxLength:50,
listeners : {
'change' : function(thisFiled,newValue,oldValue ){
Ext.Ajax.request({
url :path+'/ds/jrdw/pinyin.li',
params:{bmmc:newValue},
success: function(response,options){
var pinyin_tmp=Ext.decode(response.responseText).pinyin;
jrdwForm.form.findField("BMJX").setValue(pinyin_tmp);
}
});
}
}
},
{fieldLabel:'部门简写<font color="red">*</font>',name:'BMJX',allowBlank:false,maxLength:50},
{fieldLabel:'上级部门',name:'SJBM',maxLength:50,emptyText:'示例：六盘水市XXX部门'},
{fieldLabel:'部门联系地址',name:'BMLXDZ',maxLength:60,emptyText:'示例：六盘水市钟山区XX路XX号'},
{fieldLabel:'邮编',name:'LXDZYB',xtype:'numberfield',maxLength:10},
{fieldLabel:'办公电话',name:'BGDH',maxLength:20,emptyText:'示例：0858-8224234',
regex:/(^[0-9]{3,4}\-{0,1}[0-9]{7,8}$)|(^[0-9]{7,8}$)|(^\([0-9]{3,4}\)[0-9]{3,8}$)|(^0{0,1}13[0-9]{9}$)|(^0{0,1}[0-9]{3,5}$)/,
regexText:'办公电话格式：区号(可以不填写)+电话号码(7到8位)或手机号码或分机号(3到5位)'
},
{fieldLabel:'办公传真',name:'BGCZ',maxLength:20,emptyText:'示例：0858-8224234',
regex:/(^[0-9]{3,4}\-{0,1}[0-9]{7,8}$)|(^[0-9]{7,8}$)|(^\([0-9]{3,4}\)[0-9]{3,8}$)/,
regexText:'办公电话格式：区号(可以不填写)+电话号码(7到8位)'
},
{fieldLabel:'部门联系人',name:'BMLXR',maxLength:10},
{fieldLabel:'电子邮箱',name:'DZYX',maxLength:30,emptyText:'示例：shili@gat.gz',
regex:/^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/,
regexText:'电子邮箱格式支持内部及公用邮箱，格式自由，但必须满足XXX@XXX.XXX的格式，且只支持字母数字_-'
},
{fieldLabel:'移动电话',name:'YDDH',xtype:'numberfield',maxLength:15,emptyText:'示例：13508589969',
regex:/(^0{0,1}1[1-9]{2}[0-9]{7}$)/,
regexText:'手机号码为11位数字,支持网络手机号码'
},
//{fieldLabel:'创建日期',name:'cjrq',readOnly:true},
//{fieldLabel:'更新日期',name:'gxrq',readOnly:true},
{xtype:'textarea',fieldLabel:'备注信息',width:300,height:60,
name:'BZXX',maxLength:200},
{name: 'DID',xtype: 'hidden'}
]
});

　　在提交的时候，默认会把值传递到后台，这不是我们想要的。

　　如何去掉默认值，一般采用两种方案：

1. 提交前判断

2. 禁止emptyText提交

form提交时，配置submitEmptyText：false即可

function editJrdwInfo(){
var commitForm = jrdwForm.getForm();
if(commitForm.isValid()){
commitForm.submit({
clientValidation: true,
timeout : 180000,
url :path+'/ds/jrdw/editJrdw.li',
submitEmptyText:false,
success: function(form, action) {
new Ext.validmsg.msg('提示', action.result.msg);
try{
Ext.getCmp("jrdwGrid").getStore().reload();
}catch(e){
new Ext.validmsg.msg('警告', e);
}
win_jrdw.close();
},
failure: function(form, action) {
new Ext.validmsg.msg('警告', action.result.msg);
}
});
}
}