What is resolveComponentFactory? The resolveComponentFactory() method takes a component and returns a ComponentFactory . You can think of ComponentFactory as an object that knows how to create a component. Internally this method will call the create() method from the factory and will append the component as a sibling to our container.
What is the use of dynamic components in Angular?
Dynamic means, that the components location in the application is not defined at buildtime. That means, that it is not used in any angular template. Instead, the component is instantiated and placed in the application at runtime.
What is NgComponentOutlet?
NgComponentOutletlink
Instantiates a Component type and inserts its Host View into the current View. NgComponentOutlet provides a declarative approach for dynamic component creation.
What is Componentref in Angular?
ComponentReflink
Represents a component created by a ComponentFactory . Provides access to the component instance and related objects, and provides the means of destroying the instance.
What is Angular Componentfactoryresolver?
ComponentFactoryResolverlink
A simple registry that maps Components to generated ComponentFactory classes that can be used to create instances of components. Use to obtain the factory for a given component type, then use the factory's create() method to create a component of that type.
Related question for What Is ResolveComponentFactory?
What is ViewContainerRef?
ViewContainerRef represents a container where one or more views can be attached. The first thing to mention here is that any DOM element can be used as a view container. What's interesting is that Angular doesn't insert views inside the element, but appends them after the element bound to ViewContainer .
What is spinner in Angular?
Ngx spinner is a library for loading spinner for Angular, which is meant to inform the user that data loading is in progress. Basically Loader is used to show the loading state of data in application. Prerequisites. Basic Knowledge of Angular 2 or higher. Visual Studio Code.
How does Angular detect change?
What is custom pipe in Angular?
The most basic of pipe transforms a single value, into a new value. This value can be anything you like, a string, array, object, etc.
What is ngTemplateOutletContext?
ngTemplateOutletContext is used to bind the scope of row data to the template that will be specified by the parent. 😅That was all required to make a shared component. Next, let's see how to use this component in a parent component.
What is angular injector?
What is Angular Injector. The Angular Injector is responsible for instantiating the dependency and injecting it into the component or service. The Injector looks for the dependency in the Angular Providers using the Injection token.
What is lazy loading in Angular?
Lazy loading is a technique in Angular that allows you to load JavaScript components asynchronously when a specific route is activated. It improves the speed of the application load time by splitting the application into several bundles. When the user navigates through the app, the bundles are loaded as required.
What is TemplateRef in Angular?
TemplateRef is a class and the way to reference the ng-template in the component or directive class. Using the TemplateRef we can manipulate the template from component code.
How do you use NG content?
Create a component. In the template for your component, add an <ng-content> element where you want the projected content to appear. Add a select attribute to the <ng-content> elements. Angular supports selectors for any combination of tag name, attribute, CSS class, and the :not pseudo-class.
What is entry component?
An entry component is any component that Angular loads imperatively, (which means you're not referencing it in the template), by type. You specify an entry component by bootstrapping it in an NgModule, or including it in a routing definition.
What is nativeElement in Angular?
Angular ElementRef is a wrapper around a native DOM element (HTML element) object. It contains the property nativeElement , which holds the reference to the underlying DOM object. We can use it to manipulate the DOM. We use the ViewChild to get the ElementRef of an HTML element in the component class.
What is createEmbeddedView?
createEmbeddedView is used to create a view using TemplateRef. TemplateRef is created by Angular compiler when it encounters ng-template tag in your component HTML. The view created using this method is called an embedded view. The view created using this method is called a host view.
What is read in ViewChild?
With read: SomeType you tell what type should be returned from the element with the #myname template variable. If you don't provide the read parameter, @ViewChild() returns the. ElementRef instance if there is no component applied, or the. component instance if there is.
What is angular loader?
Angular loader allows your angular scripts to be loaded in any order. As angular-seed project shows us, Angular loader does not have any specific api, you just put it at the top of your index file (so that it's executed first) and then proceed to load your application files anyway you prefer.
What is Browseranimationsmodule?
BrowserAnimationsModulelink
Exports BrowserModule with additional dependency-injection providers for use with animations. See Animations.
How do you use mat progress-bar?
What are zones in angular?
A “zone” is a way to persist execution context across asynchronous tasks. Angular uses zones to enable automatic change detection in response to changes made by asynchronous tasks. Changes outside the angular zone will not be automatically detected.
What is implicit in angular?
You can define local variable on ng-template through let-name. When angular creates template by calling createEmbeddedView it can also pass context that will be used inside ng-template. Using the key $implicit in the context object will set it's value as default. So if we write: vcRef.
How do I use ContentChild?
Using ContentChild and ContentChildren
To use ContentChild , we need to import it first from the @angular/core . import Component, ContentChild, ContentChildren, ElementRef, Renderer2, ViewChild from '@angular/core'; Then use it to query the header from the projected content.
What is ViewChild decorator in angular?
The @ViewChild decorator allows us to inject into a component class references to elements used inside its template, that's what we should use it for. Using @ViewChild we can easily inject components, directives or plain DOM elements.
What are ng directives?
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 is directive in Angular interview questions?
A directive is a class in Angular that is declared with a @Directive decorator. Every directive has its own behaviour and can be imported into various components of an application.
What are directives in Angular 7?
Directives in Angular 7 are Typescript class which is declared with decorator @Directive. These are the Document Object Model (DOM) instruction sets, which decide how logic implementation can be done.
What is Angular life cycle?
Life Cycle Method. In Angular, every component has a life-cycle, a number of different stages it goes through from initializing to destroying. There are 8 different stages in the component lifecycle. Every stage is called life cycle hook events.
What is inject annotation?
@Inject annotation is a standard annotation, which is defined in the standard "Dependency Injection for Java" (JSR-330). Spring (since the version 3.0) supports the generalized model of dependency injection which is defined in the standard JSR-330.
What is injection token?
The Injection Token allows creating token that allows the injection of values that don't have a runtime representation. It is very similar to string tokens. But instead of using a hardcoded string, we create the Injection Token by creating a new instance of the InjectionToken class.
What is Spa in Angular?
Single page application (SPA) is a web application that fits on a single page. All your code (JavaScript, HTML, and CSS) is recovered with a single page stack. Further more, route between pages performed without invigorating the entire page.
What is Ivy compiler?
Ivy Compiler is the latest compiler for Angular application released by Angular Team. Currently, Angular is using View Engine compiler to compile Angular application. In general, Angular compiler has two options to compile an application.