jQuery: handle errors in getJSON()?

Question

How do I handle 500 errors when using jQuery's getJSON?

There have been a couple of questions about error handling with getJSON() and JSONP, but I'm not working with JSONP, just ordinary JSON.

Another answer suggests using .ajaxSetup() before calling getJSON(), so I tried this:

$.ajaxSetup({
  "error":function() {   
    alert('Error!');
}});
$.getJSON('/book_results/', function(data) { # etc

But I find that the alert always triggers, even when the result is well-formed.

Any ideas?

Answer 1

The getJSON method does not natively return errors but you could dive into the xhr object that is returned as a parameter in the callback.

The getJSON method is a shorthand function for jQuery.ajax. Using jQuery.ajax you can easily achieve error handling:

  $.ajax({     url: 'http://127.0.0.1/path/application.json',     dataType: 'json',     success: function( data ) {       alert( "SUCCESS:  " + data );     },     error: function( data ) {       alert( "ERROR:  " + data );     }   }); 

Answer 2

If you are using the jquery version 1.5 or higher you can use the new methods .success(function), .error(function) and .complete(function)

Example from http://api.jquery.com/jQuery.get/

// Assign handlers immediately after making the request, // and remember the jqxhr object for this request var jqxhr = $.get("example.php", function() {   alert("success"); }) .success(function() { alert("second success"); }) .error(function() { alert("error"); }) .complete(function() { alert("complete"); });  // perform other work here ...  // Set another completion function for the request above jqxhr.complete(function(){ alert("second complete"); }); 

Works perfect for me. I hope this helps

Answer 3

you can see it on jquery api getJSON: http://api.jquery.com/jQuery.getJSON/

$.getJSON(url).done(function(data){
   $("#content").append(data.info);
})
.fail(function(jqxhr){
   alert(jqxhr.responseText);
});

//jquery1.5+ the fail callback will trigger when text is not the correct json string or any other fail solutions