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Components have a well-defined lifecycle: Each component can implement "lifecycle hooks". These are methods that will be called at certain points in the life of the component. The following hook methods can be implemented:

Once an application is bootstrapped, it will then wait for incoming browser events (such as mouse clicks, key presses or incoming HTTP responses) that might change the model. Once such an event occurs, AngularJS detects if it caused any model changes and if changes are found, AngularJS will reflect them in the view by updating all of the affected bindings

inside Controllers or as a defined method. Here’s the method usage,

This issue with primitives can be easily avoided by following the "best practice" of always have a '.' in your ng-models – watch 3 minutes worth. Misko demonstrates the primitive binding issue with ng-switch.

Regarding tight coupling with require, this is a limitation of the framework. I believe Angular 2 is more flexible with interdirective communication from the little I have seen of it.

This effectively means that these directives cannot be used outside of annotated-image because Angular will throw an error when it cannot locate the required controller.

multiElement

When using $rootScope.$on, we need to unbind those listeners each time the $scope is destroyed. $scope.$on listeners are automatically unbound, but we’ll need to call the above closure manually on the $destroy event:

It’s known that Angular becomes slower with around 2,000 bindings due to the process behind dirty-checking. The less we can add to this limit the better, as bindings can add up without us really noticing it!

Smart components are connected to services. Though they may have inputs and outputs, they mostly know how to load their own data, and how to persist changes when they occur

Here’s what the team says about preparing code for less migration effort when we get Angular 2.0, which is luckily in-line with the guesses that several others came up with so far.

In version 1.4, bindToController gets even more powerful. When having an isolated scope with properties to be bound to a controller, we always define those properties on the scope definition and bindToController is set to true. In 1.4 however, we can move all our property binding definitions to bindToController and make it an object literal.

Changes to isolated scope properties from the outside world are not reflected back to the controllers’ this object.

In fact, we don’t even need to request $scope in our controller anymore, since the scope is bound the controller’s this reference when using controllerAs.

Best Practice: use controller when you want to expose an API to other directives. Otherwise use link.

Now, the problem is that the usual approach to controller testing is to instantiate the controller using $controller, but this fails since we do not have a named controller registered on our module

UPDATE 4/19/2015: The most current and detailed Angular Style Guide is the community-driven effort led by John Papa and Todd Motto, which you can find at https://github.com/johnpapa/angular-styleguide. Please use this instead of the one mentioned below.

While the example above is simple, it will not scale to large applications. Instead we recommend that you break your application to multiple modules like this:

When should I use an attribute versus an element? Use an element when you are creating a component that is in control of the template. The common case for this is when you are creating a Domain-Specific Language for parts of your template. Use an attribute when you are decorating an existing element with new functionality.

While this allowed imperative control logic to be mixed with the declarative HTML, developers soon realized that mixing Java directly into the HTML resulted in really messy code when the HTML pages got more advanced. The syntaxes of Java and HTML just didn't complement each other very well.

The $event variable contains the original browser event object

The orderBy filter can also take a second $scope variable as parameter. In this example that variable is named reverse. The value of this variable determines if the data objects are to be sorted in their natural order, or the reverse order of that. In this case the reverse variable is set to true, meaning the data objects will be sorted in reverse order.

ng-switch Directive

Error: filter:notarray

You will also have to tell AngularJS what part of the directive's HTML template that is to contain the transcluded HTML

This processing is called "transclusion"

In case that HTML template grows big, it is gets hard to write and maintain the HTML inside a JavaScript string.

The $digest loop keeps iterating until the model stabilizes

Dirty checking the scope for property changes is a common operation in Angular and for this reason the dirty checking function must be efficient. Care should be taken that the dirty checking function does not do any DOM access, as DOM access is orders of magnitude slower than property access on JavaScript object.

The value function should return the value which is being watched. AngularJS can then check the value returned against the value the watch function returned the last time

This will not render properly, unless we do some scope magic.

This will not render properly, unless we do some scope magic.

But ngRepeat has a dilemma. It needs to be able to clone new <li> elements for every action in user.actions. This initially seems trivial, but it becomes more complicated when you consider that user.actions might have items added to it later. This means that it needs to save a clean copy of the <li> element for cloning purposes. As new actions are inserted, the template <li> element needs to be cloned and inserted into ul. But cloning the <li> element is not enough. It also needs to compile the <li> so that its directives, like {{action.description}}, evaluate against the right scope. A naive approach to solving this problem would be to simply insert a copy of the <li> element and then compile it. The problem with this approach is that compiling on every <li> element that we clone would duplicate a lot of the work. Specifically, we'd be traversing <li> each time before cloning it to find the directives. This would cause the compilation process to be slower, in turn making applications less responsive when inserting new nodes. The solution is to break the compilation process into two phases: the compile phase where all of the directives are identified and sorted by priority, and a linking phase where any work which "links" a specific instance of the scope and the specific instance of an <li> is performed.

Angular Style Guide: A starting point for Angular development teams to provide consistency through good practices.

Reusable components with AngularJS

Advanced routing and resolves

Scalable code organization in AngularJS

ngBoilerplate

Building large apps with Angular.js

Setting headers and http params for a single request in restangular

As $resource is a factory, there is no way to make it dynamic.

In Angular spies are heavily used on any kind of unit test. When we are testing something, we don’t care about the injected dependencies, we just need to make sure that they were used properly.

Having our spy in place, all what we need to do is to call post.retrieve and then assert that getAll was called and that also post.posts contain our fake posts that were returned by getAll