jQuery $.get or $.post to catch page load error (eg. 404)

Question

How do you catch Server Error or 404 page not found, when you use $.get or $.post ?

For example:

$.post("/myhandler", { value: 1 }, function(data) {
  alert(data);
});

That will do absolutely nothing if there is a Server Error loading "/myhandler", or if it is not found.

How do you make it notify you if there is an error?

Answer 1

you could do

$.post("/myhandler", { value: 1 }, function(data) {
  alert(data);
}).fail(function(){ 
  // Handle error here
});

fail will be called if theres an error

Answer 2

use error handler on $.ajax()

$.ajax({
    url: "/myhandler", 
    data: {value: 1},
    type: 'post',
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert('status:' + XMLHttpRequest.status + ', status text: ' + XMLHttpRequest.statusText);
    },
    success: function(data){}
});

demo

Answer 3

The other answers are nice and all, but there's alternative solutions, namely .ajaxSetup, .ajaxError and other Ajax event handlers (check the ajaxSetup doc page for more info on the rest).

For example, with .ajaxError you can setup a global handler of all your ajax errors from .post, .get, .getJSON and .ajax for a specific set of elements.

$(selector).ajaxError(function(event, xhr, ajaxOptions, errorThrown) {
    // handle ajax error here
});

Answer 4

Use $.ajax instead and use the error callback.

http://api.jquery.com/jQuery.ajax/