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Angular 1.6.0: “Possibly unhandled rejection” error [duplicate]
This question already has answers here:
Possibly unhandled rejection in Angular 1.6
(9 answers)
Closed 4 years ago.
We have a pattern for resolving …
Source: stackoverflow.com
Date Published: 6/8/2021
View: 913
Angular 1.6’s Possibly unhandled rejection errors – codelord.net
Essentially, this error is printed to the console whenever a promise in your app is rejected (resolved with a failure), and there’s no .catch() …
Source: www.codelord.net
Date Published: 7/7/2021
View: 7571
AngularJS 1.7.9 how to Debug Possibly Unhandled Rejection
Debugging “possibly unhandled rejection” … The stack trace will show the file and the line number from which the error originates. Examine the …
Source: www.onooks.com
Date Published: 2/17/2021
View: 9077
Angular 1.6.0: “Possibly unhandled rejection” error [duplicate]
Angular 1.6.0: “Possibly unhandled rejection” error [duplicate] resource.get().$promise .then(function (response) {}) .catch(function (err) {});
Source: dtuto.com
Date Published: 6/6/2021
View: 9292
Angularjs Possibly unhandled rejection ok – DotnetQueries
This article will explain you how to resolve Angularjs Possibly unhandled rejection ok. This error is mainly related to angularjs version 1.5 or 1.6.
Source: dotnetqueries.com
Date Published: 1/27/2022
View: 8068
Possibly unhandled rejection – 404
Hello,. Trying to retrieve a portfolios list from Alma API and display it via custom.js file in Primo, we get this error: Possibly unhandled …
Source: developers.exlibrisgroup.com
Date Published: 6/17/2022
View: 7045
[OLMIS-1473] Fix “Possibly unhandled rejection: {}” errors
After migrating to AngularJS 1.6 there are some “Possibly unhandled rejection: {}” bugs running around. It is caused by some of the promises lacking …
Source: openlmis.atlassian.net
Date Published: 7/8/2022
View: 8955
Possibly Unhandled Rejection Error When Creating A Form …
Possibly unhandled rejection — Error when creating a form with angularjs. Tags: javascript , angularjs , valation , firebase , angularjs-q Answers: …
Source: www.faqcode4u.com
Date Published: 7/27/2021
View: 7510
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주제에 대한 기사 평가 possibly unhandled rejection angularjs
- Author: Solutions Cloud
- Views: 조회수 9회
- Likes: 좋아요 없음
- Date Published: 2022. 5. 15.
- Video Url link: https://www.youtube.com/watch?v=CsUkHI9McYA
Angular 1.6.0: “Possibly unhandled rejection” error
This question already has answers here: Possibly unhandled rejection in Angular 1.6 (9 answers) Closed 4 years ago .
We have a pattern for resolving promises in our Angular app that has served us well up until Angular 1.6.0:
resource.get().$promise .then(function (response) { // do something with the response }, function (error) { // pass the error the the error service return errorService.handleError(error); });
And here is how we are triggering the error in Karma:
resourceMock.get = function () { var deferred = $q.defer(); deferred.reject(error); return { $promise: deferred.promise }; };
Now, with the update to 1.6.0, Angular is suddenly complaining in our unit tests (in Karma) for rejected promises with a “Possibly unhandled rejection” error. But we are handling the rejection in the second function that calls our error service.
What exactly is Angular looking for here? How does it want us to “handle” the rejection?
Angular 1.6’s Possibly unhandled rejection errors
If you’ve updated to AngularJS 1.6.x, kudos! There’s not much that’s needed to get an app running with 1.5 to work with 1.6.
But, a very common error that starts appearing in people’s consoles after this upgrade is the dreaded ”Possibly unhandled rejection” error.
Did you see this and wonder what does this mean? And more importantly, how the hell do you get rid of it? Worse, if you just follow the highest voted answer on StackOverflow you probably hide bugs and won’t be aware of it. Read on for the full gist.
What does this error mean?
Essentially, this error is printed to the console whenever a promise in your app is rejected (resolved with a failure), and there’s no .catch() block to handle that failure.
AngularJS added this to nudge developers to always handle possible errors. This is much like always adding an else to every if to make sure you handle error cases, etc. After all, every unhandled rejection might be an error that you forgot to account for, a bug waiting to happen.
A very common reason for it to come up in apps is things like modals being dismissed or “canceled”, and since the app has nothing to do in those scenarios the rejected promise goes unhandled.
Getting rid of it – the icky way
The Stack Overflow answer I linked to above basically shows you how to disable this new behavior introduced in 1.6:
1 2 3 app . config ( function ( $qProvider ) { $qProvider . errorOnUnhandledRejections ( false ); });
You might be tempted to just reach for this quick fix, but be aware that it doesn’t 100% resemble that behavior in 1.5.
The catch
Say that you make a simple typo, like we all do like 20 times a day. For example, you’re handling a response from $http that looks like this: {value: “stuff”} .
Now, spot the typo:
1 2 3 $http . get ( ‘/stuff’ ). then ( function ( result ) { handleResult ( result . valye ) });
Of course, I mistyped value as valye . This code in version 1.5.x would result in an error in your console. So would it in 1.6, unless you turn off unhandled rejection errors. If you do it, this error would be swallowed, and you’ll be spending lots and lots of time debugging stuff.
That’s why I recommend solving this the right way, even though it might take more typing, unless you really really have no other choice.
Getting rid of it – the right way
Well, the trick to not having unhandled rejection errors is… well… handling them.
You should, after every every promise with a .then() block have a .catch() block (and no, .finally() blocks don’t help here):
1 2 3 4 5 $http . get ( ‘/stuff’ ). then ( function ( result ) { // … stuff here }). catch ( function () { // handle errors });
And what about cases where you absolutely don’t care about errors? The convention I’d have to recommend is explicitly handling errors in a way that says you’re aware of possible errors and don’t care:
1 2 3 $http . get ( ‘/stuff’ ). then ( function ( result ) { // … stuff here }). catch ( angular . noop ); // <-- look here! We’re passing as a handler the angular.noop function, which a function that does… nothing. It’s the equivalent of function() {} . This saves you some typing, and whenever I see noop as opposed to an empty function, I know it was left there by intention, and not that someone forgot what they were doing half way through a commit. Yeah, this is some more typing, but it’s all in favor of making more robust and bug-free apps. And I recommend setting up a shortcut in your favorite editor to add this (e.g. my TextExpander is set up to write .catch(angular.noop) whenever I type ;noop ). Happy erring!
AngularJS 1.7.9 how to Debug Possibly Unhandled Rejection
Aware of sitar questions, such as Angularjs 1.7.9 – Possibly unhandled rejection and those mentioned in it as duplicates.
Code does not use promises (that I am aware of; certainly no $promise or $http ).
Just knocking up a simple Uri-router demo for a friend. It is just two views, each with a button that toggles to the other view. It works just fine with Anglers 1.5, and breaks with the above error in 1.7.
A simple as it is, it’s a bit too much code to post. In case, rather than finding the error in my code, I woudl like a canonical answer to help others who read this question in future : how to go about denugging this error message?
Error: transition failed
at r [as $get] (http://localhost/common/js/third_party/ui-router_zero_pint_2_point_11/angular-ui-router.min.js:7:11365) at Object.invoke (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:45:62) at http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:46:365 at d (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:43:495) at e (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:44:235) at Object.invoke (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:44:320) at http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:47:18 at r (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:8:76) at fb (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js:46:499) at c (http://localhost/common/js/third_party/angular-1_point_7_point_9/angular.min.js
You will get a more informative stack trace if you use angular.js instead of angular.min.js and angular-ui-router.js instead of angular-ui-router.min.js . Angular-UI-Router uses promises in its transition module. It looks like you upgraded your version of AngularJS without upgrading the version of Angular-UI-Router. Upgrade your router from V0.2.11 to V0.4.3. It looks like your problem is caused by sloppy Angular-UI-Router code. If they didn’t fix the issue by V0.4.3, you can either patch the library or live with the messages.
Debugging “possibly unhandled rejection”
The stack trace will show the file and the line number from which the error originates. Examine the code and fix the problem. If the error orginates in a third- party library, try upgrading to the latest version or contacting the third-party library vendor.
As a last resort, disable the “possibly unhandled rejection” messages:
app.config(functon ($qProvider) { $qProvider.errorOnUnhandledRejections(false); });
This is not recommended as it allows other problems to silently fail.
If one doesn’t care about a specific promise failing, add a .catch handler:
$http(config).then(function(response) { //… }).catch(function(response) { //I don’t care about errors if (debug) console.log(response); //Re-throw error response throw response; })
Upgrading AngularJS
When upgrading AngularJS, it is best to upgrade all of the AngularJS modules at the same time. That is when migrating from [email protected] to [email protected] , at the same time upgrade to [email protected] , [email protected] , [email protected] , etc. I have seen unpleasant problems when trying to mix and match versions of AngularJS modules.
When migrating, I recommend upgrading one minor version at a time. For example, upgrade from V1.4 to V1.5 first, fix what breaks, then upgrade to V1.6.
The current version is 1.7.9 pollution-eradication (2019-11-19) . I recommend using the latest version as the AngularJS team has committed to fixing security bugs only in both V1.2.x and the latest version. For more information, see
Upgrading Angular-UI-Router
UI-Router for AngularJS has two major versions
I recommend upgrading to the latest version of UI-Router-Legacy before migrating to the latest version of UI-Router for AngularJS. There have been major breaking changes between the two and it is best to deal with it incrementally.
For more informaton, see
One way to debug ui-router is the following:
From the console inject the $state service typing the following:
var test = angular.element(document.body).injector().get(‘$state’);
Then simulate and perform the transition that causes the problem:
test.go(‘root.details’) // use the state url here
After that, details of the transition will be printed in console. Into $$state object, you may find more details about the failed transition and reasons of failure:
explained well my mistake. If the error occurs while changing state from one view to another(for example if your states are state1 and state2 ), then go to the first view state1 , and then from the console execute the above script test.go(‘state2’)
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Possibly unhandled rejection
Hello,
Trying to retrieve a portfolios list from Alma API and display it via custom.js file in Primo, we get this error:
Possibly unhandled rejection: {“data”:false,”status”:404,”config”:{“method”:”JSONP”,”transformRequest”:[null],”transformResponse”:[null],”jsonpCallbackParam”:”callback”,”url”:”\”https://api-eu.hosted.exlibrisgroup.com/almaws/v1/bibs/99125963502792/portfolios?apikey=APIKEYREMOVED&format=json\””,”headers”:{“Accept”:”application/json, text/plain, */*”},”skipAuthorization”:true},”statusText”:”error”}
But when using the URL in the browser (https://api-eu.hosted.exlibrisgroup.com/almaws/v1/bibs/99125963502792/portfolios?apikey=APIKEYREMOVED&format=json) we get the proper response.
I used:
$sce.trustAsResourceUrl()
and
$sceDelegateProvider.resourceUrlWhitelist()
(both) in order to set the above URL as trusted one.
And this is the angular code for the call:
$http.jsonp(JSON.stringify(trustedUrl), {jsonpCallbackParam: ‘callback’}).then(function(data) {
alert(JSON.stringify(data.data));
});
I thought that the first JSON.stringify() is redundant but without it, we get the following error message:
SyntaxError: unexpected token: ‘:’
(for the first ‘:’ sign in the callback text).
What should we do in order to make Primo see get the portfolios list?
If needed, I will send all the code parts.
Thanks,
Nir
Possibly Unhandled Rejection Error When Creating A Form With Angularjs
Tags: javascript , angularjs , validation , firebase , angularjs-q Answers: | Viewed 6,228 times
I created this simple web application to put data into a firebase database. The problem is that I get a error when I open the webpage in my browser. This is the error I get
Possibly unhandled rejection: {} angular.js:14324
Also when I press the sumbit button the first time with no data in the fields it displays the same error as shown above. Then when I press the button again it does submit the empty fields to the database. I think angular finds it a problem that the fields are empty. Am I missing something? Putting text in the fields works fine and it also submits to the database. It’s just with empty fields that their are problems.
var app = angular.module(“sampleApp”, [“firebase”]);
app.controller(“SampleCtrl”, function($scope, $firebaseArray) {
var ref = firebase.database().ref().child(“messages”);
$scope.loading = true;
$firebaseArray(ref).$loaded().then(function(){
$scope.loading = false;
document.getElementById(‘loader’).style.display = ‘none’;
});
$scope.messages = $firebaseArray(ref);
$scope.addMessage = function() {
$scope.messages.$add({
name: $scope.name,
company: $scope.company,
reason: $scope.reason,
wayofcontact: $scope.wayofcontact,
});
$scope.name = ”;
$scope.company = ”;
$scope.reason = ”;
$scope.wayofcontact = ”;
document.getElementById(“name”).focus();
};
});
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Angular #1.6.0 #Possibly #unhandled #rejection #error #- #JavaScript
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