Read e-book online AngularJS PDF

By Brad Green, Shyam Seshadri

ISBN-10: 1449344852

ISBN-13: 9781449344856

Develop smaller, lighter net apps which are basic to create and straightforward to check, expand, and retain as they develop. This hands-on consultant introduces you to AngularJS, the open resource JavaScript framework that makes use of Model–view–controller (MVC) structure, facts binding, client-side templates, and dependency injection to create a much-needed constitution for development net apps.

Guided by means of engineers who labored on AngularJS at Google, you’ll stroll during the framework’s key positive factors, after which construct a operating AngularJS app—from structure to trying out, compiling, and debugging. You’ll learn the way AngularJS is helping decrease the complexity of your internet app.
* Dive deep into Angular’s development blocks and find out how they interact
* achieve greatest flexibility via keeping apart common sense, facts, and presentation tasks with MVC
* gather your complete app within the browser, utilizing client-side templates
* Use AngularJS directives to increase HTML with declarative syntax
* speak with the server and enforce basic caching with the $http carrier
* Use dependency injection to enhance refactoring, testability, and a number of atmosphere layout
* Get code samples for universal difficulties you face in such a lot net apps

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42 | Chapter 2: Anatomy of an AngularJS Application

As we learned previously, we would be better off in the long run by delegating the work of talking to the server to a service that could be shared across controllers. We’ll take a look at this structure and the full range of $http functions in Chapter 5. Changing the DOM with Directives Directives extend HTML syntax, and are the way to associate behavior and DOM trans‐ formations with custom elements and attributes.

If a string is passed to the $watch function, then it will be evaluated as an expression in the scope of the $scope it’s called on. This strategy might work well for your app. However, since we’re watching the items array, Angular will have to make a copy of it to compare it for us. For a large list of items, it may perform better if we just recalculate the bill properties every time Angular eval‐ uates the page. discount = total > 100 ? discount; }); Watching multiple things What if you want to watch multiple properties or objects and execute a function when‐ ever any of them change?

Now that we know about this issue, there are a few ways we can solve it. One way would be to create a $watch on changes to the items array and just recalculate the total, discount, and subtotal as properties on the $scope. discount = total > 100 ? $watch('items', calculateTotals, true); } Notice here that the $watch specified items as a string. This is possible because the $watch function can take either a function (as we did previously) or a string. If a string is passed to the $watch function, then it will be evaluated as an expression in the scope of the $scope it’s called on.

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AngularJS by Brad Green, Shyam Seshadri

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