如何处理jsonp错误？

Question

I'm making a jsonp request with jquery.ajax() like this:

var cep = 99999999;
$.ajax({
    url: "http://cep.paicon.com.br/jsonp/"+ cep +"?callback=addressFunction",
    dataType: 'jsonp',
    crossDomain: true,
    jsonp: false
})

When there alright, the requested page call my callback function normally.

But, in some situations, the requested page don't return anything.

How can i handle this error, since it won't call any callback function?

Thanks!

(Sorry for my poor English)

Answer 1

You can't handle that. The server must be made to always return some JavaScript, which in the case of an error might be something that calls some pre-arranged error handler function, or whatever seems appropriate.

Answer 2

If your requested page returns nothing, then you need to wrap it in some code so it returns an error code in some JSON. So, you could decorate the request service with something that has a timeout and then returns some json that might be:

{
   errorCode: "requestTimeout"
}

Answer 3

You can set a timeout on your $.ajax() call, and handle the lack of response via that mechanism.

$.ajax({
  url: "http://cep.paicon.com.br/jsonp/"+ cep +"?callback=addressFunction",
  type: "GET",
  dataType: "jsonp",
  timeout: 2000,
  success: function(response) { alert(response); },
  error: function(x, t, m) {
      if(t==="timeout") {
          alert("got timeout");
      } else {
          alert(t);
      }
  }
});​

Answer 4

I got handle the error with the textStatus == "parsererror" in $.ajax error setting.

Now my function is like that:

function buscaEndereco(cep){
    url = "http://cep.paicon.com.br/jsonp/"+ cep;
    $.ajax({
       url: url,
       type: "GET",
       dataType: 'jsonp',
       crossDomain: true,
       timeout: 10000,
       success: function(response){ 
           montaEndereco(response); 
       },
       error: function(x, t, m){
           if(t == "timeout"){
           alert("Timeout");
           } else {
            if(t == "parsererror"){
               alert("CEP not found");
            } else {
               alert(t);
            }
           }
       }
    });
}

Thanks