What is the difference between template and templateUrl in angular 2?

What is the difference between template and templateUrl in angular 2?

According to Angular, when you have a complex view (i.e. a view with more than 3 lines), then go with templateUrl (use external file); otherwise, use the template (inline HTML) properly of the component decorator.

What is app component HTML in angular?

Components are the main building block for Angular applications. Each component consists of: An HTML template that declares what renders on the page. A Typescript class that defines behavior. A CSS selector that defines how the component is used in a template.

What is @component in angular?

Components are the most basic UI building block of an Angular app. An Angular app contains a tree of Angular components. Angular components are a subset of directives, always associated with a template. Unlike other directives, only one component can be instantiated for a given element in a template.

How do I use templateUrl in angular 2?

  1. How do I join the 2 components in that case? I mean how do I join the app.component.html with home.component.html followed by about.component.html ? –
  2. Create a component containing that HTML and add its tag that matches it’s selector to the other compinents template.
  3. Oh now I get that!

What are selectors in angular?

What is a Selector in Angular?

  • A selector is one of the properties of the object that we use along with the component configuration.
  • A selector is used to identify each component uniquely into the component tree, and it also defines how the current component is represented in the HTML DOM.

What is templateUrl in angular?

address}} templateUrl can also be a function which returns the URL of an HTML template to be loaded and used for the directive. AngularJS will call the templateUrl function with two parameters: the element that the directive was called on, and an attr object associated with that element.

What is viewProviders in angular?

The viewProviders defines the set of injectable objects that are visible to its view, DOM children. They are not visible to the content children. At the component level, you can provide a service in two ways: Using the providers array. Using the viewProviders array.

What is pipe in angular?

Pipes are a useful feature in Angular. They are a simple way to transform values in an Angular template. There are some built in pipes, but you can also build your own pipes. A pipe takes in a value or values and then returns a value.

What are directives in angular?

Directives are classes that add additional behavior to elements in your Angular applications. With Angular’s built-in directives, you can manage forms, lists, styles, and what users see. Structural directives—directives that change the DOM layout by adding and removing DOM elements.

What is @ViewChild?

A ViewChild is a component, directive, or element as a part of a template. If we want to access a child component, directive, DOM element inside the parent component, we use the decorator @ViewChild() in Angular. Since the child component can be located inside the parent component, it can accessed as @ViewChild.

Why directives are used in angular?

Angular directives are used to extend the power of the HTML by giving it new syntax. Each directive has a name — either one from the Angular predefined like ng-repeat , or a custom one which can be called anything. And each directive determines where it can be used: in an element , attribute , class or comment .

What is AOT in angular?

The Angular ahead-of-time (AOT) compiler converts your Angular HTML and TypeScript code into efficient JavaScript code during the build phase before the browser downloads and runs that code.

Which transpiler is used in angular?

The compiler takes the TypeScript code and converts it into JavaScript. This process is commonly referred to as transpiling, and since the TypeScript compiler does it, it’s called a transpiler.

Which is better JIT or AOT?

We use JIT in development mode while AOT is for production mode. We can easily implement features and debug in JIT mode since we have map file while AOT does not. However, The big benefit when we use AOT for production are reducing bundle size for faster rendering.

What is Ivy angular?

Ivy is the code name for Angular’s next-generation compilation and rendering pipeline. With the version 9 release of Angular, the new compiler and runtime instructions are used by default instead of the older compiler and runtime, known as View Engine.

How do you activate ivy?

To update an existing project to use Ivy, set the enableIvy option in the angularCompilerOptions in your project’s tsconfig. app. json . AOT compilation with Ivy is faster and should be used by default.

Is angular material compatible with ivy?

The Angular team has worked hard to ensure Ivy is as backwards-compatible with the previous rendering engine (“View Engine”) as possible.

What are zones in angular?

A zone is an execution context that persists across async tasks. You can think of it as thread-local storage for JavaScript VMs. This guide describes how to use Angular’s NgZone to automatically detect changes in the component to update HTML.

What is NgUpgrade in angular?

NgUpgrade is a library put together by the Angular team, which we can use in our applications to mix and match AngularJS and Angular components and bridge the AngularJS and Angular dependency injection systems.

What is TemplateRef and ViewContainerRef?

It represents a container where one or more views can be attached. We can use its methods such as createEmbeddedView() and createComponent() import { Directive, TemplateRef, ViewContainerRef, Input } from ‘@angular/core’;

What is ComponentRef?

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 the difference between ViewChild and ContentChild?

ViewChild is used to select an element from component’s template while ContentChild is used to select projected content.

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. It is created by Angular compiler when you specify a component in the bootstrap property of the module so that compiler generates a factory for it.

How do you use ViewContainerRef?

Get ViewContainerRef with ViewChild: We can use the ViewChild decorator to grab any element in our view and read him as ViewContainerRef . In this example, the container element is the “div” element, and the template will be inserted as a sibling of this “div.”

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.

How do I get rid of ViewContainerRef?

remove() link The 0-based index of the view to destroy. If not specified, the last view in the container is removed. Optional. Default is undefined .

How do you destroy components?

To make a component destroy itself when the user navigates away from it, you have to make the component call its ngOnDestroy() lifecycle hook when the page unloads. This is done by leveraging the host page’s life cycle. All NativeScript applications (Core, Vue and Angular) have Pages.

What is read ViewContainerRef?

There can be several instances of various types associated with the element tag with the #myname template variable. For each element there is an ElementRef and ViewContainerRef (maybe others from components or directives applied to that tag). If the element is a component, then there is the component instance.

How do you destroy dynamic components?

The ComponentRef instance allow you to destroy the dyanamic component. Then the destroyComponent method simply check the componentRef instance exist or not if it exist we will destroy the component. In the TestComponent I have a Output property call eventOutput.

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