jQuery AJAX or XHR request trigger fail callbacks from done callback
Is there a way in my done handler of a jQuery XHR (created from a $.get() call) to look for problems in the response and then trigger the registered subsequent handlers (lie fail & always) with a custom error message?
something like this:
$.get( URL )
.done(
function (data, status, res) {
if(/*some condition*/){
this.Reject(res, status, "some reason");
return
}
//Do stuff on success
}
)
.fail(
//Common error handler here
)
.always(
//common always handler here
);
Kind of a secondary filter on done. The reason is of course all the APIs that shove an error in a 200 response that jQuery could never know was an error.
I figured out how to do this, and it works nicely:
$.get( URL )
.then(
function (data, status, res) {
if(/**some error check**/({
return $.Deferred().reject(res, status, "error message");
}
return $.Deferred().resolve(data, status, res);
}
)
.done(
function (data, status, res) {
//Do stuff on success
}
)
.fail(
//Common error handler here
)
.always(
//common always handler here
);
works like a charm, now i don't have messy data error handling in my done, i can just focus on processing data or setting error messages.
Thanks for this question, and Chris's answer.
I tried this and it worked, except it was triggering the fail function for an implicit unexpected exception (caused by a bug), not for my test AJAX exception. Which made me thought, it might work for an explicit exception without the hassle of creating a new promise object. So I though I would try an explicit throw - and it worked.
This explicit throwing works in jQuery 3. I'm not sure about earlier versions. I tried doing this in a done handler and it didn't work: throwing only seems to work in a then handler
$.get( URL )
.then(
function (data, status, res) {
if(/**some error check**/({
throw "error message";
}
return data; //this is also important
}
)
.done(
function (data, status, res) {
//Do stuff on success
}
)
.fail(
//Common error handler here
)
.always(
//common always handler here
);
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