In this video, Aviv Ben-Yosef explains why $scope.$watch usages need to be carefully handled when moving to use controller-as syntax and how to address it.
- [Instructor] A tricky part of converting controllers…to user controller as syntax is the behavior…of the scope watch function.…Take a look at this code in todo.js, in the exercise files.…Here, todo.done is evaluated by Angler…as a name of a property on the .scope object…and so, this checks for the value of .scope.todo.done;…the logic is the same as how expressions…in templates are evaluated.…This stop working once I change…the controller to use controller as syntax,…since $watch still evaluates the expressions…given to is using the scope.…
The current fix for this is to use another capability…of $watch, which is to pass the watch expression…as a function instead of a string.…This takes more typing, but modern apps…shouldn't make a lot of use of $watch anyway.…In projects that use ES six,…it's possible to use arrow functions…and make this even shorter.…
Now, the $watch call is back to working order.…
Aviv Ben-Yosef kicks off the course by explaining what's different in Angular 1.6, as well the different motives for upgrading. Next, he walks through how to safely upgrade an existing app. He covers going from controllers to directives, as well as component lifecycle hooks. He also goes into the architectural changes in Angular, such as one-way data flow and immutability. To wrap up, he discusses how to properly test components.
- Deciding to upgrade an existing app
- Upgrading to Angular 1.6
- Removing standalone controllers
- Using directives as route targets
- Converting a controller's code
- Converting a controller's template
- Comparing directives and components
- Converting a directive
- Reviewing the concept of one-way binding
Skill Level Intermediate
AngularJS 1: Building a Data-Driven Appwith Ray Villalobos2h 15m Intermediate
1. Controllers to Directives
2. Use controllerAs
Convert a controller’s code1m 57s
3. Directives to Components
4. Component Lifecycle Hooks
5. One-Way Data Binding
6. Testing Components
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