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