The Renderer is a class that is a partial abstraction over the DOM. Using the Renderer for manipulating the DOM doesn't break server-side rendering or Web Workers (where direct access to the DOM would break). ElementRef is a class that can hold a reference to a DOM element.
What is the difference between renderer and elementref?
Using the Renderer for manipulating the DOM doesn't break server-side rendering or Web Workers (where direct access to the DOM would break). ElementRef is a class that can hold a reference to a DOM element. This is again an abstraction to not break in environments where the browsers DOM isn't actually available.
Why do we need renderer2 in angular?
This will give us access to the DOM APIs. The Renderer2 class is a service that provides an abstraction for UI rendering manipulations. Using it is the recommended approach because it then makes it easier to develop apps that can be rendered in different environments. Angular: Stop manipulating DOM with ElementRef!
Why do we need to use elementref in angular?
Using it is the recommended approach because it then makes it easier to develop apps that can be rendered in different environments. Angular: Stop manipulating DOM with ElementRef!
What is the renderer class?
The Renderer is a class that is a partial abstraction over the DOM. Using the Renderer for manipulating the DOM doesn't break server-side rendering or Web Workers (where direct access to the DOM would break).
What is the difference between ElementRef and Renderer?
The Renderer is a class that is a partial abstraction over the DOM. Using the Renderer for manipulating the DOM doesn't break server-side rendering or Web Workers (where direct access to the DOM would break). ElementRef is a class that can hold a reference to a DOM element.
What is ElementRef in Angular?
Angular ElementRef is a wrapper around a native element inside of a View. It's simply a class that wraps native DOM elements in the browser and allows you to work with the DOM by providing the nativeElement object which exposes all the methods and properties of the native elements.
What is Renderer in Angular?
The Renderer2 class is an abstraction provided by Angular in the form of a service that allows to manipulate elements of your app without having to touch the DOM directly.
When should I use ElementRef?
According to Angular docs ElementRef : Use this API as the last resort when direct access to DOM is needed. Permitting direct access to the DOM can make your application more vulnerable to XSS attacks. Carefully review any use of ElementRef in your code.
What is the difference between ViewChild and ContentChild?
Any directive, component, and element which is part of component template is accessed as ViewChild. Whereas, any element or component which is projected inside
What is the difference between ViewChild and ViewChildren?
The ViewChild or ViewChildren decorators are used to Query and get the reference of the DOM element in the Component. ViewChild returns the first matching element and ViewChildren returns all the matching elements as a QueryList of items. We can use these references to manipulate element properties in the component.
What is the meaning of Renderer?
Renderer definition (computer graphics) A software or hardware process that generates a visual image from a model. noun. 3. One who, or that which, renders. noun.
What is the use of @ViewChild 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 is a DOM in Angular?
What is AngularJS DOM? DOM stands for Document Object Model. AngularJS's directives are used to bind application data to the attributes of HTML DOM elements.
What is HTML element in Angular?
Angular elements are Angular components packaged as custom elements (also called Web Components), a web standard for defining new HTML elements in a framework-agnostic way.
What is ViewContainerRef in Angular?
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 are the different directives in Angular?
There are four types of directives in Angular,Components directives.Structural directives.Attribute directives.Custom Directive.
How do you use ElementRef in Angular 10?
To manipulate the DOM using the ElementRef , we need to get the reference to the DOM element in the component/directive. Create a template reference variable for the element in the component/directive. Use the template variable to inject the element into component class using the ViewChild or ViewChildren.
What is use of @ViewChild?
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 is the use of DOM in Angular?
What is DOM in AngularJS? The logical structure of documents and documents are accessed and manipulated are defined using DOM elements. It defines events, methods, properties for all HTML elements as objects. DOM in AngularJS acts as an API (programming interface) for javascript.
What is static in ViewChild Angular?
The static option for @ViewChild() and @ContentChild() queries determines when the query results become available. With static queries (static: true), the query resolves once the view has been created, but before change detection runs.
What is renderer2 in HTML?
It provides a layer of abstraction between the DOM element and the component code. Using Renderer2 we can create an element, add a text node to it, append child element using the appendchild method., etc. We can also add or remove styles, HTML attributes, CSS Classes & properties, etc. We can also attach and listen to events etc.
Why not ElementRef?
The nativeElement Property contains the reference to the underlying DOM object. This gives us direct access to the DOM, bypassing the Angular. There is nothing wrong with using it, but it is not advisable for the following reasons.
How to create a new element in div?
Create a new div element using createElement. Add a text node to it using createText and append it to the div
How does createElement work?
createElement creates a new element, but does not insert it into the DOM. To insert into the DOM, we need to add it to an element, which already exists in the DOM using appendChild method.
What is the first argument in renderer2?
The first argument is the selector or node. The Renderer2 uses the selector to search for the DOM element and returns it.
What does create element2 do?
The complete code as under. The createElement2 appends the new child node a another div.
Does Angular keep the component in sync?
Angular keeps the Component & the view in Sync using Templates , data binding & change detection, etc. All of them are bypassed when we update the DOM Directly.
What is renderer2 in Angular?
The Renderer2 class is an abstraction provided by Angular in the form of a service that allows to manipula te elements of your app without having to touch the DOM directly. This is the recommended approach because it then makes it easier to develop apps that can be rendered in environments that don’t have DOM access, like on the server, in a web worker or on native mobile.
Why use renderer2?
Basic Usage. You’ll often use Renderer2 in custom directives because of how Angular directives are the logical building block for modifying elements. Here’s a simple example that uses Renderer2’s addClass method to add the wild class to elements that have the directive: go-wild.directive.ts.
insertBefore () link
Implement this callback to insert a child node at a given position in a parent node in the host element DOM.
removeChild () link
Implement this callback to remove a child node from the host element's DOM.
selectRootElement () link
Implement this callback to prepare an element to be bootstrapped as a root element, and return the element instance.
parentNode () link
Implement this callback to get the parent of a given node in the host element's DOM.
nextSibling () link
Implement this callback to get the next sibling node of a given node in the host element's DOM.
setAttribute () link
Implement this callback to set an attribute value for an element in the DOM.
removeAttribute () link
Implement this callback to remove an attribute from an element in the DOM.