This article is about AngularJS. 12,000 other sites out of 1 million tested in October 2016. The framework adapts and extends traditional HTML angularjs book pdf free download 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. AngularJS 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.