jQuery MiniUI,Ajax Web开发

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