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

• sladda: +1 for fail function. it does the job! You can use it like this: .fail(function(e){ if(e.status == 404){ // ... } else{ // ... } })
• Dylan Valade: Older code with .error() wasn't catching anything. Simply switching it to fail() did the trick.
• Jeppe: This should be the accepted answer, as it directly answers the question, rather than asking everyone to use a different function.

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

• E.E.33: So is this not possible with $.get?
• u936293: @Reigel Beautiful! Didn't realize the load callback has a Status parameter.

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/

Answer 5

Try using $.ajaxSetup() , stausCode option

$.ajaxSetup({
 statusCode : {
 // called on `$.get()` , `$.post()`, `$.ajax()`
 // when response status code is `404`
 404 : function (jqxhr, textStatus, errorThrown) {
 console.log(textStatus, errorThrown);
 }
 }
 });
// $.get("/path/to/url/");
// $.post("/path/to/url/");
// $.ajax({url:"/path/to/url/"})