AngularJS is a JavaScript-based open-source front-end web framework used for creating dynamic single-page applications. It allows developers to build interactive and responsive web applications with a clean and modular code structure. AngularJS simplifies data binding, handles dependency injection, and provides tools for routing and unit testing.
Data binding in AngularJS synchronizes data between the model and the view automatically. It provides two-way data binding, meaning any changes to the model data are instantly reflected in the view, and vice versa. This simplifies the process of updating data and keeping the UI in sync with the underlying data.
One-way binding in AngularJS updates the view whenever the model changes, while two-way binding updates both the view and the model whenever either one changes. One-way binding is unidirectional, from the model to the view, whereas two-way binding is bidirectional, allowing changes in both directions.
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ExploreIn AngularJS, dependency injection is used to provide necessary components to a module or a function. It allows you to declare the dependencies of a module or service and AngularJS will then inject those dependencies when that module or service is instantiated or called.
Directives in AngularJS are markers on a DOM element that tell AngularJS to attach a specified behavior to that element. They can be used to create reusable components, manipulate the DOM, bind data to elements, and more. Directives are a powerful feature in AngularJS for extending HTML functionality.
The digest cycle in AngularJS is the process by which the framework checks all the data bindings to detect changes and update the UI accordingly. It goes through all the watchers to see if any values have changed and then updates the view if necessary.
ng-model is a directive in AngularJS used to bind the value of HTML controls (like input, select, textarea) to application data. It creates a two-way binding between the data in the model and the view, allowing changes in the view to automatically reflect in the model and vice versa.
$scope is a JavaScript object that binds a controller with the HTML (view) while $rootScope is a parent of all $scope objects. $scope is specific to a controller and its children, while $rootScope is available globally across all controllers in an AngularJS application.
Routing in AngularJS is the concept of navigating between different views or pages in a single-page application. It is implemented by defining routes in the application using the $routeProvider service provided by AngularJS. The routes map URLs to specific controllers and templates for dynamic content loading.
$http is a core AngularJS service for making AJAX calls to remote servers, handling response, and promise resolution, while $resource is a higher-level service that is built on top of $http and provides more convenient interaction with RESTful APIs by exposing additional methods like get, save, query, update, delete.
Filters in AngularJS are used to format and manipulate data displayed in the view. They can be applied to expressions, directives, and binding values to modify the output for better readability and user experience. Filters are implemented using the pipe symbol (|) in HTML templates.
The $watch function in AngularJS is used to monitor changes in a variable or expression. It is typically used to track and react to changes in data within the AngularJS app in real-time. This is useful when you need to perform certain actions based on changes to specific data in the application.
To optimize performance in an AngularJS application, you can use techniques such as minification and concatenation of JavaScript files, enabling production mode, avoiding unnecessary watch functions, using one-time bindings, implementing lazy loading of modules, and leveraging server-side caching for data. Additionally, optimizing network requests and reducing DOM manipulations can help improve performance.
Promises in AngularJS are used to handle asynchronous operations. They represent a future value that may be available at some point. Promises help manage callbacks and avoid callback hell by providing a cleaner way to handle asynchronous code, making it easier to work with data returned from asynchronous operations.
Transclusion in AngularJS allows you to include external content or HTML templates within a custom directive. This feature enables the directive to control where the transcluded content will be placed within the directive's template. By using the ng-transclude directive, the transcluded content can be inserted into the directive's template.
$broadcast is used to dispatch an event downwards to all child scopes, $emit is used to dispatch an event upwards to all parent scopes, and $on is used to listen for events in the current scope or any of its children. Each serves a specific purpose in event propagation in AngularJS.
In an AngularJS application, you can handle authentication by using services like AngularJS satellizer or AngularJS JWT to manage tokens, set up login/logout functionality, and store user session data. For authorization, you can implement role-based access control and restrict access to certain routes or components based on user permissions.
AngularJS is a JavaScript-based open-source front-end web framework used for creating dynamic single-page applications. It allows developers to build interactive and responsive web applications with a clean and modular code structure. AngularJS simplifies data binding, handles dependency injection, and provides tools for routing and unit testing.
AngularJS is an open-source JavaScript framework developed by Google. It is designed to make front-end web development easier by providing tools and functionalities for building dynamic and interactive web applications. AngularJS follows the MVC (Model-View-Controller) architecture to separate the concerns of data, presentation, and user interaction.
There are several reasons why you would use AngularJS in your web development projects:
Here is a simple example of using AngularJS to display a list of items:
- {{ item }}
In this example, AngularJS is used to iterate over an array of items and display them in a list using the ng-repeat directive. The controller defines the items array and makes it available to the view for rendering.
Overall, AngularJS is a powerful framework for building modern web applications with rich user interfaces and seamless user experiences.