Javascript

Download e-book for iPad: AngularJS by Brad Green, Shyam Seshadri

By Brad Green, Shyam Seshadri

ISBN-10: 1449344852

ISBN-13: 9781449344856

Develop smaller, lighter net apps which are basic to create and simple to check, expand, and preserve 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, info binding, client-side templates, and dependency injection to create a much-needed constitution for construction internet apps.

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

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The Items object, in turn, needs some way to communicate with the database on the server over XHR or WebSockets. Doing this without modules looks something like this: function ItemsViewController($scope) { // make request to server … // parse response into Item objects … } // set Items array on $scope so the view can display it ... While this would certainly work, it has a number of potential problems. • If some other controller also needs to get Items from the server, we now have to replicate this code.

Why six? Three of them we can trace pretty easily, as it runs one time each in: • The template as {{totalCart() | currency}} • The subtotal() function • The $watch() function Then Angular runs all of these again, bringing us to six. Angular does this to verify that transitive changes in your model have fully propagated and your model has settled. Angular does this checking by making a copy of all watched properties and comparing them to the current value to see if they’ve changed. In fact, Angular may run this up to ten times to ensure full propagation.

This has the effect of setting the selected class when our model property called selectedRow matches the ng-repeat’s $index. selectedRow = row; }; } Considerations for src and href Attributes When data binding to an or tag, the obvious path of using {{ }} in the src or href attributes won’t work well. Because browsers are aggressive about loading images parallel to other content, Angular doesn’t get a chance to intercept data binding requests. While the obvious syntax for an might be: Instead, you should use the ng-src attribute and write your template as: Similarly, for the tag, you should use ng-href: some text Expressions The goal behind the expressions that you use in templates is to let you be as clever as you need to be to create hooks between your template, your application logic, and your data, but at the same time prevent application logic from sneaking into the template.

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AngularJS by Brad Green, Shyam Seshadri


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