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JavaScript AJAX Basics (retiring) jQuery and AJAX Handling Errors

Jay Norris
Jay Norris
14,824 Points
Posted by Jay Norris
Jay Norris
14,824 Points

no response and .fail()

If there is simply no response from the server, will that trigger the .fail() method? What is the best way to test for nothing being sent?

2 Answers

Erik Nuber
Erik Nuber
20,629 Points
Erik Nuber
Erik Nuber
20,629 Points

Here is a couple of different ways to test...

function update() {
  $.ajax({
    type: 'GET',
    dataType: 'json',
    url: url,
    timeout: 5000,
    success: function(data, textStatus ){
       alert('request successful');
    },
    error: function(xhr, textStatus, errorThrown){
       alert('request failed');
    }
  });
}

and

$.getJSON('/foo/bar.json')
    .done(function() { alert('request successful'); })
    .fail(function() { alert('request failed'); });

In the first example, there is a timeout of 5 seconds. It isn't necessary to do but, gives a little extra time. You can do anything within the error function including using the information passed back from the fail. That is what is stored in textStatus and errorThrown.

for example.

console.log('ajas request failed. Returned ' + textStatus + ' and it threw an error of ' + errorThrown);

The second way is just using a different method to handle the ajax request but does the same thing.

Jay Norris
Jay Norris
14,824 Points
Jay Norris
Jay Norris
14,824 Points

That is an extremely helpful answer! Thank you.