extjs4 表单提交 和 Ajax请求 示例_"return \"{success : false ,msg :"

表单的提交form.submit和Ajax请求里的success和failure回调函数有点区别，

表单提交后要求后台返回的必须是json字符串，且必须包含success:true 或 success:false，如果不包含这个直接返回一个json字符串就会执行failure函数，这个郁闷我一下午……

Ajax请求则不同，只要后台返回一个字符串就能成功接收到

表单提交（这里我就直接写handler了）

		handler : function() {
					var form = me.down('form').getForm();
					if (form.isValid()) {
						form.submit({
							url : 'http://localhost:8080/b_springmvc_extjs/formSubmit.do',
							method : 'POST',
							waitTitle : "提示",
							waitMsg : '正在提交数据，请稍后 ……',
							success : function(form, action) {
								Ext.Msg.alert('success', 'bbb  ' + form
												+ action.result.msg);
								this.close();
							},
							failure : function(form, action) {
								Ext.Msg.alert('failure', 'bbb' + form
												+ action.result.msg);
								this.close();
							}
						});
					}
				}

后台

	@RequestMapping(value = "/formSubmit.do", method = RequestMethod.POST)
	@ResponseBody
	public String formSubmit(@ModelAttribute(value = "user") User user) {
		if (user != null || !equals("")) {
			System.out.println(user.getId());
			System.out.println(user.getFirstname());
			System.out.println(user.getLastname());
			try {
				Thread.sleep(1000 * 2);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			return "{success:true,msg:'success submit --- yang'}";
		}
		return "{success:false,msg:'failure submit --- xuan'}";
	}

然后是Ajax请求，这里我是监听一个combo的focus事件（mvc模式）

'frameNorth combo[id=changeSkin]' : {
						focus : this.comboFocus
				}

comboFocus : function(combo, The, eOpts) {		
		Ext.Ajax.request({	//ajax request test
					url : 'http://localhost:8080/b_springmvc_extjs/ajaxRequest.do',
					 /*  headers: {
					       'userHeader': 'userMsg'
					   },*/
					params : {
						name : 'yangxuan'
					},
					method : 'POST',
					success : function(response, options) {
						Ext.MessageBox.alert('成功', '服务端返回数据 : '+ response.responseText);
					},
					failure : function(response, options) {
						Ext.MessageBox.alert('失败', '错误编号：' + response.status);
					}
				});
	},

后台

	@RequestMapping(value = "ajaxRequest.do", method = RequestMethod.POST)
	@ResponseBody
	public String ajaxRequest(@RequestParam(value = "name") String name) {
		if (name != null || !name.equals("")) {
			System.out.println("name : " + name);
			return "success ajax request";
		}
		return "fail ajax request";
	}