Error handling in getJSON calls
How can you handle errors in a getJSON call? Im trying to reference a cross-domain script service using jsonp, how do you register an error method?
$.getJSON()
is a kind of abstraction of a regular AJAX call where you would have to tell that you want a JSON encoded response.
$.ajax({
url: url,
dataType: 'json',
data: data,
success: callback
});
You can handle errors in two ways: generically (by configuring your AJAX calls before actually calling them) or specifically (with method chain).
'generic' would be something like:
$.ajaxSetup({
"error":function() { alert("error"); }
});
And the 'specific' way:
$.getJSON("example.json", function() {
alert("success");
})
.done(function() { alert("second success"); })
.fail(function() { alert("error"); })
.always(function() { alert("complete"); });
Someone give Luciano these points :) I just tested his answer -had a similar question- and worked perfectly...
I even add my 50 cents:
.error(function(jqXHR, textStatus, errorThrown) {
console.log("error " + textStatus);
console.log("incoming Text " + jqXHR.responseText);
})
Here's my addition.
From http://www.learnjavascript.co.uk/jq/reference/ajax/getjson.html and the official source
"The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callback methods introduced in jQuery 1.5 are deprecated as of jQuery 1.8. To prepare your code for their eventual removal, use jqXHR.done(), jqXHR.fail(), and jqXHR.always() instead."
I did that and here is Luciano's updated code snippet:
$.getJSON("example.json", function() {
alert("success");
})
.done(function() { alert('getJSON request succeeded!'); })
.fail(function() { alert('getJSON request failed! '); })
.always(function() { alert('getJSON request ended!'); });
And with error description plus showing all json data as a string:
$.getJSON("example.json", function(data) {
alert(JSON.stringify(data));
})
.done(function() { alert('getJSON request succeeded!'); })
.fail(function(jqXHR, textStatus, errorThrown) { alert('getJSON request failed! ' + textStatus); })
.always(function() { alert('getJSON request ended!'); });
If you don't like alerts, substitute them with console.log
$.getJSON("example.json", function(data) {
console.log(JSON.stringify(data));
})
.done(function() { console.log('getJSON request succeeded!'); })
.fail(function(jqXHR, textStatus, errorThrown) { console.log('getJSON request failed! ' + textStatus); })
.always(function() { console.log('getJSON request ended!'); });