rarwe.tar.gz

Ember

Ember-copy

ember2

embercss

rarwe

Ember-copy-5yvdqv

Ember-copy-5yvdqv-copy

Ember-Acceptest

Ember-Acceptest-copy

Ember-unitest

rarwe-copy

Ember-Acceptest-challenge

Ember-helper-challenge

In this course, you begin with an introduction to Ember.js, a JavaScript framework for building client-side applications.

After that, the course guides you through the steps of building a real application so that you can see how the concepts are applied in practice. You'll learn about the building blocks of Ember one by one, in a way that crushes the allegedly steep learning curve of the framework.

The application will get shinier (and/or more robust) with each chapter. By the end, we will have a decent app, and you'll have a great new skill you can add to your resume.

Developing Robust Ember.js Applications

# Controllers are singletons
If we play around with the app, we notice something strange. If we start typing a new song title but decide to switch to a new band, the text field stays on the screen with the unfinished song title as its value. This seems weird and is caused by the fact that controllers are singletons in Ember.

What does this mean? It means that each controller class only has one single instance in the application. That instance is created when we enter the corresponding route and is not destroyed when we move away from it.

That explains the above phenomenon: `this.showAddSong` and `this.title` are properties on the controller, so they retain their value even when moving to a new page. If that’s not how we want it to be, Ember has us covered by providing a specific hook to update controller properties when moving between routes. It’s called `resetController`, and it’s called on the route every time a route transition is initiated.

# Reset method
We can use this method to reset the properties:

You’ll learn about the singleton property of controllers in this lesson.

Beware of Singletons