Getting AJAX response body for use in error callback

user_25068 0
Viewed 49145

jQuery's AJAX error function has the following parameters:

error(XMLHttpRequest, textStatus, errorThrown)

What's the best cross-browser way to get the response body?

Does this work (reliably in all browsers)?

$.ajax({
  error: function(http) {
    alert(http.responseText);
  }
});
jquery ajax
4 Answers

One straightforward usage example with jQuery:

var url = '/';
$.get(url).then(
  function(response) {
      $("#result").html(response);
  },
  function(jqXHR) {
    $("#result").html('Error occurred: '+ jqXHR.statusText + ' ' + jqXHR.status);
  }
);

This should return the HTML of current website front page.

Then try entering a nonsense URL that doesn't exist and see the error thrown. You should get "404 Not Found" from web server. Test it: JSFiddle here

user_11969450

There is a hidden function that can extract the data from XHR istance:

var responseText = $.httpData(xhr)

If you pass "json" as a second parameter it will treat the response as a JSON string.

Note that you might get an error because there is no response (network problem for example). Make sure you cover that case as well. Also, I believe (not sure) that jQuery invokes the error handler if the server returns a 4xx or 5xx status.

user_1356650
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