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Angular JS

Angular JS

From Beginning

AngularJS is a powerful, open-source JavaScript framework developed by Google for building dynamic, single-page web applications (SPAs).

It extends HTML with additional features, enabling developers to create interactive and responsive web applications with minimal effort.

AngularJS also uses the Model-View-Controller (MVC) architecture, making it easier to organize code. With features like dependency injection, directives, and reusable components, AngularJS enhances code modularity, testability, and reusability, making it a popular choice for developing dynamic, data-driven web applications.

AngularJS uses a two-way data binding model, meaning changes in the UI automatically update the model and vice versa. This reduces the need for manual DOM manipulation, making development faster and more efficient. Additionally, AngularJS has a modular architecture with components like controllers, services, directives, and dependency injection, allowing for organized and maintainable code.

While AngularJS is the original version, it has evolved into Angular (from Angular 2 onward), which has a completely different architecture and approach.

  • Introduction
  • Expressions and Data Biding
  • Working with Directives
  • Controllers
  • Filters
  • Forms
  • Modules
  • Services
  • Ajax in AngularJS
  • Routing

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What is AngularJS?

AngularJS is an open-source JavaScript framework maintained by Google for building dynamic single-page applications (SPAs). It extends HTML with additional attributes and binds data to HTML, making it easier to create rich, interactive, and responsive applications.

Explain the architecture of AngularJS.

AngularJS follows the MVC (Model-View-Controller) architecture:

Model: Manages data and business logic. o View: Displays the data (HTML with AngularJS directives). o Controller: Links the Model and View, controlling data flow and user interaction.

What is two-way data binding in AngularJS?

Two-way data binding is a feature in AngularJS where changes in the model automatically reflect in the view, and changes in the view update the model. This ensures synchronization between the UI and application logic.

What are directives in AngularJS?

Directives are special attributes in AngularJS that extend HTML functionality. They are used to create custom HTML tags, manipulate the DOM, and enhance HTML with new behaviors. Examples include ng-model, ng-repeat, and ng-if.

What is $scope in AngularJS?

$scope is an object that binds the controller and the view. It acts as a glue between the controller and the view in AngularJS, holding the model data and functions, allowing them to be accessed in the HTML view.

What is dependency injection (DI) in AngularJS?

Dependency Injection (DI) is a design pattern where objects are provided with their dependencies, rather than creating them internally. AngularJS uses DI to inject services or dependencies into controllers, directives, and other components, making code modular and easier to test.

Explain the role of services in AngularJS.

Services are singleton objects used to organize and share data and logic across the application. They are injected into controllers, directives, or other services, helping to separate business logic from controllers. Common services include $http for HTTP requests, $timeout, and custom services.

What is $http service in AngularJS?

$http is a core AngularJS service that facilitates communication with remote servers via HTTP requests. It is commonly used to fetch or save data and returns a promise, which allows developers to handle asynchronous requests easily.

What is the difference between ng-show and ng-hide vs. ng-if?

ng-show and ng-hide toggle the visibility of elements by adding or removing the CSS display property, keeping the element in the DOM. ng-if completely removes or recreates the element in the DOM based on the condition, which can be more efficient for conditional rendering.

What is the digest cycle in AngularJS?

The digest cycle is a process in AngularJS that checks for changes in the application’s model and view. When a change is detected, AngularJS applies it and reevaluates the model and view, ensuring data synchronization. The digest cycle is triggered automatically by Angular events or can be manually initiated with $apply().

What are custom directives, and how do you create them in AngularJS?

Custom directives allow developers to extend HTML with custom behaviors. They are created using module.directive() and can be used to create reusable components or handle specific DOM manipulations. A custom directive requires a name and a function that defines its behavior.

What is a controller in AngularJS?

A controller in AngularJS is a JavaScript function associated with a particular scope. It provides the data and logic used by the view, initializing $scope with model properties and functions, allowing the view to interact with the model and perform actions.

Explain the purpose of filters in AngularJS.

Filters are used in AngularJS to format data displayed in the view without altering the original data in the model. Commonly used filters include currency, date, uppercase, lowercase, and filter for searching or sorting lists.

What is $watch in AngularJS?

$watch is a function used to monitor changes in $scope variables. When the watched variable changes, AngularJS executes a callback function, allowing developers to respond to these changes. $watch is part of the digest cycle.

What are modules in AngularJS?

Modules in AngularJS are containers for different parts of an application, such as controllers, directives, services, and filters. They allow you to organize code into reusable blocks and dependencies, defined using angular.module().

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