Question: What Is Lazy Loading In Angular?

How do you implement lazy loading?

The basic idea of lazy loading is simple – defer loading anything that is not needed right now.

For images it usually translates to any image that is not visible to the user up front can be lazy loaded.

As the user scrolls down the page, the image placeholders start coming into viewport (visible part of the webpage)..

What is NgModule in angular?

@NgModule takes a metadata object that describes how to compile a component’s template and how to create an injector at runtime. It identifies the module’s own components, directives, and pipes, making some of them public, through the exports property, so that external components can use them.

What is router outlet in angular?

Introduction. Router-outlet in Angular works as a placeholder which is used to load the different components dynamically based on the activated component or current route state. Navigation can be done using router-outlet directive and the activated component will take place inside the router-outlet to load its content.

What is directive in angular?

AngularJS directives are extended HTML attributes with the prefix ng- . The ng-app directive initializes an AngularJS application. The ng-init directive initializes application data. The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.

What are observables in angular?

Angular makes use of observables as an interface to handle a variety of common asynchronous operations. … You can define custom events that send observable output data from a child to a parent component. The HTTP module uses observables to handle AJAX requests and responses.

How do you use lazy loading in angular 6?

To add lazy loading in your Angular 6 application you need to setup routing to use the loadChildren() method and add components that you want to lazy-load inside feature modules i.e outside the main application module app-main. module. ts . Note: This tutorial works with Angular 6 and Angular 7.

How do I know if lazy loading is working?

You can check to see that a module is indeed being lazy loaded with the Chrome developer tools. In Chrome, open the dev tools by pressing Cmd+Option+i on a Mac or Ctrl+Alt+i on a PC and go to the Network Tab. NOTE: Another important check is to make sure that a module loaded lazily is not loaded again.

How does lazy loading work?

How Lazy Loading Works. When someone adds a resource to a web page (image, video, etc.), the resource references a small placeholder. As a user browses the web page, the actual resource is cached by the browser and replaces the placeholder when the resource becomes visible on the user’s screen.

What are some advantages of lazy loading?

The benefits of lazy loading include:Reduces initial load time – Lazy loading a webpage reduces page weight, allowing for a quicker page load time.Bandwidth conservation – Lazy loading conserves bandwidth by delivering content to users only if it’s requested.More items…

Does lazy loading affect SEO?

The issue, however, arises when you’re trying to optimize for SEO. Lazy loading impacts how search engines crawl your site. If your page doesn’t immediately load, search engines can’t crawl the entire page. … If you use lazy loading, you’ll want to make sure all relevant content is visible in the viewport.

What is lazy loading module?

With lazy loading our application does not need to load everything at once, it only needs to load what the user expects to see when the app first loads. … Modules that are lazily loaded will only be loaded when the user navigates to their routes.

How does lazy loading work in angular 8?

In Angular 8, dynamic import syntax was introduced for lazy-loaded routes as one of the new features instead of a custom string as in previous versions. To demonstrate the functionality of this lazy loading, we need to create 2 more modules called profile and settings.

What is decorator in angular?

Decorators are a design pattern that is used to separate modification or decoration of a class without modifying the original source code. In AngularJS, decorators are functions that allow a service, directive or filter to be modified prior to its usage.

What are child routes in angular?

Routes can be prepended with / , or ../ ; this tells Angular where in the route tree to link to. In the above example, the link for route one links to a child of the current route. The link for route two links to a sibling of the current route.