AngularJs, about the digest cycle

Question

I'm starting a project with AngularJs (v 1). And that was nice until I started to wonder about the quality of my project. Because now I try to avoid abusing the $scope, $scope.$apply, $scope.broadcast and other nice things like that.

So now, all of my _controller_s are using var vm = this; instead of $scope and my directives are using callbacks instead of $scope.$apply. The problem I have is that the changes are not updated. While the usage of $scope.$apply from a model attribute inside a directive was automatically updating the views it is not the case with a callback to a controller that update the model attribute. Then a workaround is to use _event_s but since $scope.$broadcast and his friends is not recommended, I have to create my own observers.

But at the end, I have the feeling to loosing the cool features of AngularJs. And started to wonder how are professionnals doing.

How do you ensure that changes made to a model are updated to a view ?
How you ensure that changes made to a model from a view are updated to another (master-details) ?

Thanks a lot for your advices.

This is a fairly broad question. For general advice, the Angular 1 Style Guide was a big help for us. — TrueWill
– TrueWill, Commented Jul 1, 2016 at 13:52
Much too broad. Provide a concrete minimal example of something that doesn't work as you expect. With code. — JB Nizet
– JB Nizet, Commented Jul 1, 2016 at 13:56

Petr Averyanov · Accepted Answer · 2016-07-01 14:07:24Z

1

Calbacks do not trigger angular digest. But events do not trigger digest either. The thing is that you usually want to call digest after: -user click -user input -http response -... And for all these cases there are built-in functions that trigger digest: $http, ng-click, ng-change, etc.

answered Jul 1, 2016 at 14:07

Petr Averyanov

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2 Comments

gervais.b Over a year ago

So @Petr Averyanov, explicit calls to $scope.$applyis not that bad ?

Petr Averyanov Over a year ago

explicit calls to $scope.$apply is not badat all, it is just not for beginners - you need to be 100% sure in what you are doing

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