调试代码遇到一个问题,就是前台执行删除操作后,controller返回数据,但前台接收时,ajax不执行success回调,总是弹出失败的对话框.接收数据类型是json.

先看看我的前台代码.

@H_502_21@if (rows) { $.messager.confirm('警告','确定删除吗?',function(r) { if (r) { $.ajax({ type : 'post',url : 'deleteStudentTeachClass',data : { "ids" : ids },dataType : 'json',traditional : true,success : function(result) { $.messager.alert("提示","恭喜您，删除成功","info"); $("#dg").datagrid("reload"); },error : function(msg) { $.messager.alert("提示","操作失败","info"); $("#dg").datagrid("reload"); } }); } }); }

下面是后台controller代码

@RequestMapping(value = "/deleteStudentTeachClass")
			public void deleteStudentTeachClass(String ids,HttpServletRequest request,HttpServletResponse response) throws Exception {
						
				String dataBaseName = "itoo_platform";
				String[] strArray = null;
				strArray = ids.split(",");
				Boolean flag = false;
				String result = "false";
				try {
					flag = schoolTeachingBean.deleteStudentTeachClass(strArray,dataBaseName);
					if (flag == true) {
						result = "success";
					}
				} catch (RuntimeException e) {
					e.printStackTrace();
				}
				outToJson.outJson(response,result);
			}

通过查询发现dataType如下的说明:

"json": Evaluates the response as JSON and returns a JavaScript object. In jQuery 1.4 the JSON data is parsed in a strict manner; any malformed JSON is rejected and a parse error is thrown. (See json.org for more information on proper JSON formatting.)

也就是说jquery1.4版本以后对json格 式要求非常严格,要满足json.org网站定义的格式才能执行success回调，否则都会出错，无法解析返回的json数据.我看了下返回到前台的字符串,的确不是严格的json格式.


于是把后台返回值改成了这样:

@H_502_21@if (flag == true) { result = "{\"result\":true}"; }

但无论返回true还是false都执行success回调,这让我更郁闷.百思不得其解.

最终把前台判断改成了这样:

@H_502_21@if (rows) { $.messager.confirm('警告',dataType : 'text',success : function(result) { if(result=='true'){ $.messager.alert("提示","info"); $("#dg").datagrid("reload"); } else{ $.messager.alert("提示","info"); $("#dg").datagrid("reload"); } } }); } }); } 原文链接：https://www.f2er.com/ajax/163115.html