Issue with AngularJS: The view is not being updated after a nested http call

There is a specific scenario where I am required to make a call to the Github API in order to fetch the information of a particular user. Following that, I need to issue another call to retrieve the repositories belonging to that user:

search(login: string): void {
       this.user = undefined; 
       // initial call               
       this.githubApi.getUser(login)
            .then(user => {
                this.user = user;
                // secondary call
                this.githubApi.getRepos(user.repos_url)
                    .then(reposResponse => {
                        this.repos = reposResponse.repos;
                        // I am hesitant to use this.$scope.$apply() here!;
                    });
            });
    }

The first call works successfully and updates the elements bound to this.user without any issues in the view. The second call also executes properly, returns the desired result, and sets this.repos correctly. However, the view does not reflect these changes.

Adding this.$scope.$apply() at the end of the second callback resolves the update issue in the view, but I believe there might be a better approach to handle this.

Any suggestions for a solution?

Answer №1

If you're hesitant to utilize $scope.apply();, consider modifying the response code of your getRepos service like this:

setTimeout(
 () => {
  this.repos = updatedResponse.repos;
 }, 0
)

Answer №2

Understanding why the view in Angular-Js is not updating is crucial.

If you have already used $scope.$apply(), then you are familiar with its purpose and functionality. However, there may be instances where despite using callbacks - especially nested callbacks - Angular fails to update the view. This could be due to Angular wrongly assuming it does not need to update the view because of the callbacks, leading the watchers to not take action when variables change.

In such cases, employing $scope.$apply() triggers the digest cycle once more to prompt the watchers to update the view. If the digest cycle is not running properly, Angular will not show any errors but fail to update the view. Re-running the digest cycle forces Angular to correct this issue, as two-way binding should function correctly.

If there are alternative solutions I am unaware of, I would welcome that knowledge. Using $scope.$apply() is a valid approach designed to address these specific challenges.

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