This article is about AngularJS. 12,000 other sites out of 1 million tested in October 2016. The framework adapts and extends traditional HTML java performance tuning o reilly pdf present dynamic content through two-way data-binding that allows for the automatic synchronization of models and views.
As a result, AngularJS de-emphasizes explicit DOM manipulation with the goal of improving testability and performance. The difficulty of this is dramatically affected by the way the code is structured. This allows development work to progress in parallel, and allows for reuse of both sides. UI, through writing the business logic, to testing. Angular implements the MVC pattern to separate presentation, data, and logic components.
AngularJS uses the term “scope” in a manner akin to the fundamentals of computer science. As a part of the “MVC” architecture, the scope forms the “Model”, and all variables defined in the scope can be accessed by the “View” as well as the “Controller”. The scope behaves as a glue and binds the “View” and the “Controller”. When the term “scope” is used below, it refers to the Angular scope object and not the scope of a name binding. AngularJS directives allow the developer to specify custom and reusable HTML-like elements and attributes that define data bindings and the behavior of presentation components. Declares the root element of an AngularJS application, under which directives can be used to declare bindings and define behavior. Sets the text of a DOM element to the value of an expression.
Conditionally apply a class, depending on the value of a boolean expression. Basic if statement directive that instantiates the following element if the conditions are true. When the condition is false, the element is removed from the DOM. When true, a clone of the compiled element is re-inserted.
Called once when the element is initialized. Provides tuning for how model updates are done. Instantiate an element once per item from a collection. Conditionally show or hide an element, depending on the value of a boolean expression. Show and hide is achieved by setting the CSS display style.
Conditionally instantiate one template from a set of choices, depending on the value of a selection expression. JSON before rendering templates driven by specified controllers. Instead, templates are rendered in plain HTML according to data contained in a scope defined in the model. Angular detects changes to the model section and modifies HTML expressions in the view via a controller. Likewise, any alterations to the view are reflected in the model.
This circumvents the need to actively manipulate the DOM and encourages bootstrapping and rapid prototyping of web applications. Different ways of defining a watcher in AngularJS. Angular as an open-source library. Both AngularJS and Angular are currently supported. AngularJS, including the concept of a component-based application architecture. This release among others removed the Sandbox, which many developers believed provided additional security, despite numerous vulnerabilities that had been discovered that bypassed the sandbox.