Is there any analog to a 'finally' in jQuery AJAX calls?
JavascriptJqueryAjaxPromiseJavascript Problem Overview
Is there a Java 'finally' analogue in jQuery AJAX calls? I have this code here. In my always I throw an exception, however I ALWAYS want it to go to the then() method.
call.xmlHttpReq = $.ajax({
url : url,
dataType : 'json',
type : 'GET'
}).always(function(processedDataOrXHRWrapper, textStatus, xhrWrapperOrErrorThrown) {
throw "something";
}).then(function() {
alert("i want to always run no matter what");
});
I have tried to use done(), complete(), and the another always(), but nothing seems to work.
Here is JSFiddle :
Javascript Solutions
Solution 1 - Javascript
See this example:
$.ajax({
type: "GET",
dataType: dataType,
contentType: contentType,
async: TRUE,
url: $('html form:nth-child(1)').attr('action') + "?" $('html form:nth-child(1)').serialize(),
success: function(data) {
console.log("FUNFOU!");
},
error: function(data) {
console.log("NÃO FUNFOU!");
},
complete: function(data) {
console.log("SEMPRE FUNFA!");
//A function to be called when the request finishes
// (after success and error callbacks are executed).
}
});
> For more informations: http://api.jquery.com/jquery.ajax/
Solution 2 - Javascript
.always() should work. See the The jqXHR Object section at http://api.jquery.com/jQuery.ajax/.
> jqXHR.always(function(data|jqXHR, textStatus, jqXHR|errorThrown) { }); > An alternative construct to the complete callback option, the > .always() method replaces the deprecated .complete() method. > > In response to a successful request, the function's arguments are the > same as those of .done(): data, textStatus, and the jqXHR object. For > failed requests the arguments are the same as those of .fail(): the > jqXHR object, textStatus, and errorThrown. Refer to deferred.always() > for implementation details.
Solution 3 - Javascript
The below suggestions will not work in jQuery, because jQuery's promise implementation does not handle errors thrown in methods passed to then. I am only leaving them here as an illustration of what could be possible if jQuery was promises/A+ compliant. As Bergi rightly points out, you will have to manually wrap your code in your own try catch block.
call.xmlHttpReq = $.ajax({
url : url,
dataType : 'json',
type : 'GET'
}).then(function(processedDataOrXHRWrapper, textStatus, xhrWrapperOrErrorThrown) {
throw "something";
}).always(function() {
alert("i want to always run no matter what");
});
Although I'm not sure if jquery's promise supports always, an alternative would be to use then (again) and pass the same function as both successHandler and errorHandler, like this :
call.xmlHttpReq = $.ajax({
url : url,
dataType : 'json',
type : 'GET'
}).then(function(processedDataOrXHRWrapper, textStatus, xhrWrapperOrErrorThrown) {
throw "something";
}).then(function() {
alert("i want to always run no matter what");
},
function() {
alert("i want to always run no matter what");
});
Solution 4 - Javascript
Just a note for those who use jQuery 3.0 and later
>Deprecation Notice: The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callbacks are removed as of jQuery 3.0. You can use jqXHR.done(), jqXHR.fail(), and jqXHR.always() instead.
Solution 5 - Javascript
There is a bug ajax is dependent on the server, need to check status with "complete" is the best, a kind of "success", "error" and others are not 100% of the PUT, POST and GET ... look at an example
$.ajax({
url: '/api/v2/tickets/123456.json',
....
....
....
complete: function(data) {
if (data.statusText == "success") {
console.log("Sent successfully");
} else {
console.log("Not Sent");
}
}
});
Sorry bad english! Cheer ;-)
Solution 6 - Javascript
if you want one code definition for all ajax requests, you can do it like this
$(document).ajaxComplete(function () {
console.log('ajax complete on doc');
})