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Ext JS 4 - Ajax和Rest代理处理服务器端异常和消息的方法
可能要处理的情况:
success(成功)——Ext处理
failure(失败),由于通讯问题——Ext处理
failure(失败),由于服务器端异常——开发人员人员必须处理的响应失败……
解决方案一
在应用程序控制器中编写以下方法:
//Ajax Response Error Handler Ext.Ajax.on('requestexception', function(conn, response, options, eOpts) { var error = response.status + ' - ' + response.statusText; console.log('Ajax Request Exception! '+error); if (response.status != 200) { var errorData = Ext.JSON.decode(response.responseText); console.log('ajax req error:'+errorData.message); console.log('Ajax request Error', response.status); } });
解决方案二
当在服务器端发生异常时,可以将500作为响应标头,原因作为HTML内容发送回客户端。
store.on('loadexception', function(a,conn,resp) { if (resp.status == '304') { Ext.Msg.alert('Content has not changed'); }else if(resp.status == '200') { return; //Do nothing }else if (resp.status == '401') { Ext.Msg.alert('Authentication required - You need to Login'); }else if (resp.status == '302') { errorDialog.body.update('Session Has Expired'); errorDialog.show(); }else if(resp.status == '500') { errorDialog.body.update(resp.responseText); errorDialog.show(); }else{ errorDialog.body.update('An uncaught exception has occured'); errorDialog.show(); } }
解决方案三
当发送Ajax或REST请求时,Ext JS 4代理通常会预期返回的信息包括参数:data、success和message。参数message是可选的,不过当需要将请求结果显示给用户的时候,它就可派上用场了。
function requestMessageProcessor(proxy, response) { if (response && proxy) { try { var responseData = proxy.reader.getResponseData(response); if (responseData.message) { var messageDescription = 'Information'; // title of the alert box var messageIcon = Ext.MessageBox.INFO; if (!responseData.success) { var messageDescription = 'Error'; var messageIcon = Ext.MessageBox.ERROR; } Ext.MessageBox.show({ title: messageDescription, msg: responseData.message, buttons: Ext.MessageBox.OK, icon: messageIcon }); } } catch(err) { // Malformed response most likely console.log(err); } } } And here’s the part which should reside in proxy: proxy: { ... listeners: { exception: function(proxy, response, options) { requestMessageProcessor(proxy, response); } }, afterRequest: function(request, success) { requestMessageProcessor(request.scope, request.operation.response); } }
作者: Raja
原文: http://extjsexamples.blogspot.com/2014/04/extjs4-handle-server-side-exceptions.html
译者: 黄灯桥
译文: http://blog.csdn.net/tianxiaode/article/details/28105833
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