how to reuse a component in angular 7

In Angular, the constructor should only be responsible for dependency injection. 7. But in order to use it as a component: First of all, we import Component from the @ angular/core library, so we can create an Angular Component; The @ Component decorator marks the TS class as a Component and allows us to add the following metadata; The selector is for calling the component inside other HTML files of the project, as an HTML … The content is likely still applicable for all Angular 2 + versions. We can think of Angular Components like LEGO pieces. Hi, I'm John Papa. To perform complex initializations shortly after construction. Sharing the data between components is possible by using a service file as well which I have explained already in another article. 15 Feb, 2020 . The whole application is built by using different components. Installing Angular 10 CLI. That's why I specified "using Angular" in the title. In this particular use case Component Inheritance is … You've probably already built many components and have reused them within your app. It can be done but highly frowned upon. Overall I do not recommend using Component Inheritance but rather use composition to mix and match multiple components together. The core idea behind Angular is to build components. We create a component once but can use them multiple times in different parts of our website. It will always trigger CD on itself, there will be no way to optimize this component because of its side-effects (the HTTP request). Previous Post. Angular 10/9/8 provide to create your custom component. Google Kubernetes Engine Logging by Example, Understanding Arrow Functions in JavaScript, Getting Started with a Serverless Framework, How to use Python Lambda functions: a 5-Minute Tutorial. Why? Bonus: composition in a service. Overall I do not recommend using Component Inheritance but rather use composition to mix and match multiple components together. Now you've got a component. Can this be done? Whenever you create a new component always think of ways you can make the component dumb if not possible try isolating components out of the component and make them dumb. I tried to make a button component and reuse it. Shared modules do not only make your app tidier, but can reduce the actual size of an application by far. Components define areas of responsibility in the user interface, or UI, that let you reuse sets of UI functionality. For example The A’s previous PlayMusic component: We cannot optimize the component. How to clear routeReuseStrategy manually in Angular 7? Now lets see how we can test, by including a component from the library created, in our angular application. The version installed at the time of writing is version 1.11.0, which I was unable to get working in Chrome 68. Class mixins 3. Now, since its output is determined by the input, it can be optimized to be highly performant, that's why we added a CD strategy to be OnPush. I had not written on it before. Identify multiple concerns in a component. If a Container component has any presentational content, it is failing the SRP in SOLID, it has multiple concerns and should be extracted. 6 months ago. These are often called “Dumb” components because they are dependent on their parent component to supply them data to display. Now if A’s app is not reusable, he will find it hard to share the UI interface to B. Let’s say A’s app looks this: See this component loads music files from wherever A wants and stores the array of music returned in the musicFilesproperty. How would there be no problem? To make sure Angular knows this is meant to be a reusable Angular Element component, you'll need to make some changes to the app.module.ts file: Now our application has two custom built components. Don’t worry, all of these steps can be done automatically by Angular CLI, but you can edit them manually if needed. Let’s see a scenario where re-usable components come in handy to help us in our project. The Component injects MusicService, it implements the OnInit lifecycle hook This is where it subscribes to the observable returned byMusicService#loadAllMusic. Understanding Components. We have seen the file structure in one of our previous chapters. Imagine we have this component structure: app1 — app1.component.html — app1.component.ts parent1 parent2 app2 — app2.component.html — app2.component.ts How could I reuse … In addition we see four new files associated with the automatically generated component. All you need to do is to tell Angular that it is an Angular Element, and package it up so you can send it to all your friends! Pure CSS to Make a Button “Shine” and Gently Change Colors Over Time, The Darker Side of PWAs You Might Not Be Aware of. A component can be reused … work-space > angular-component-library > ng build ratify. This goes against how things are supposed to be written. import { Component } from '@angular/core'; This component does not have a single responsibility (it needs to keep track of its mode and know how to display items in both card and list view) and isn’t very flexible (it can only display items with a header and content).Let’s change that by breaking the component into separate views using templates. Repositories no longer limit modularity and reusability. So this is basically what an Angular Component is, but that’s not all. In this post, we are going to use Angular Component Inheritance to derive two subcomponents to display some data. We went through with A to make his component re-usable and was finally able to share it to B. His MusicShare component loads music files using the MusicShareService and assigns it to the allMusic property. A component is where the content of an application is placed. B might load music, but he might load it from a different URL from A if, at all A loads from a network, A might be reading from storage. As they generate their data, they contain no presentational content, they merely pass the data to Presentational components, it is their job to know how to display the data. After some digging … 1. virtual-machines.compon… Let's get started. In this post, we are going to use Angular Component Inheritance to derive two subcomponents to display some data. One crucial aspect of components is re-usability. The component does not have any business logic, the component gets what it renders via the musicFiles binding and emits an event to the parent via playMusic. In Angular, you can create view templates with the aid of the ng-template element. Angular 7 2 Application Performance In Angular 7, there is bundle budget added in angular.json as shown below: Budgets is a feature added to Angular CLI which allows you to set limit inside your configuration to make sure your application size is within the limit set. Now, A need to isolate the pieces that can be reused in another component. In AngularJS, a Component is a special kind of directive that uses a simpler configuration which is suitable for a component-based application structure. When a component implements minor internal events, on one side Angular is smart enough to flexibly fire change detection (in spite of OnPush strategy), and on the other side the component can still be quite reusable (in spite the fact that it does have control over some events). One component will be a list view and another a table view. Build Angular … Angular provides many components that make building reusable code possible, among them it's . Now you can create more and more ice cream types without changing the ice cream card component — nice reuse of the card. Bit helps you and your team develop, share and collaborate on individual components. The UI presentation was split from the PlayMusiccomponent and is now being handled by MusicList component. It is the newly created component. A SPA app is a tree of components, it starts with the root component, going up spreading into multiple branches. To set up the component after Angular sets the input properties. Components are the key features of Angular. Open WebStorm>> Go to your project source folder>> Expand the app directory and … Displaying a specific page/section and its data with the support of Interpolation, Directives, and Pipes, Binding data between the view and the model. What is the most convenient way to reuse components in angular 7? Imagine we have this component structure: app1 — app1.component.html — app1.component.ts parent1 parent2 app2 — app2.component.html — app2.component.ts How could I reuse … Angular 2(+) Angular 4/5 Reusable component Here we will be discussing about how to reuse a component and also about how to pass data to a component. So in this tutorial, we will move our HTTP request into an Injectable service. A component is where the content of an application is placed. The responsibility of the component is purely to present the data to the user and not to fetch it from a particular location. Right click on the server directory and create a new file named as "server.component.ts". B would have no problem integrating the component to his project. Material Theme with Angular 7 – Change primary and accent color. Simple POST request with a JSON body and response type This sends an HTTP POST request to the JSONPlaceholder api which is a fake online REST api that includes a /posts route that responds to POST requests with the contents of the post body and an id property. VS Code editor; Angular Essentials Extension for VS Code; Angular Language Service for VS Code; Angular Lazy Load Demo source code; Tweet. Spec.ts is for testing, and you can ignore module.ts for now. In addition to components, there are two other kinds of directives: structural and attribute. We may receive a commission for purchases made through this link. An Angular app contains a tree of Angular components.— Angular official docs. import { Component, OnInit } from '@angular/core'; @Component({ selector: 'app-new-cmp', templateUrl: './new-cmp.component.html', styleUrls: ['./new-cmp.component.css'] }) export class NewCmpComponent implements OnInit { constructor() { } ngOnInit() {} } Here, we have to import the core too. As of Angular 6, they introduced Angular CLI Workspaces, allowing you to house more than one project in a single workspace. Even though it’s possible to achieve some kind of layout reuse with Angular router, as described above, both approaches seem a bit “hacky” and painful. In the template he just feeds the allMusic array to the musicFiles of MusicList component, the component just renders the music files in the beautiful UI he (B) likes. Put the logic into a service and call the service from both components. Publish everything to npm. We could reuse this component in all of these scenarios, because the lessons list component does not know where the data comes from. It just renders what it is given if in any need of anything (play music or share music) it communicates it to the parent (here MusicShare) component, which is responsible for the logic(business logic) whether on how to play or share the music. We have to make the app update when the array is referentially changed. Well, the answer lies on inside the app.component.ts: We have here an ordinary TypeScript class. That's why I specified "using Angular" in the title. Tags Angular angular7 RxJS. Besides, he only needs the UI (the style of display). They are the simplest building blocks of SP applications. There doesn't seem to be a life cycle hook for that. Creating a New Angular 10 Example Project. Easily install in your projects. Let's run bellow command to create Post Component: ng g component Post. Export the library for Angular and as Web Components. Easily collaborate and share. That’s indeed a really good thing because it allows us to ship less code, increase productivity, and keep a healthy codebase. We create a component once but can use them multiple times in different parts of our website. Major part of the development with Angular 7 is done in the components. Check this stackblitz link for complete source code and Demo. Many things are wrong with this component. I need to check some some data on reattachment, which might have been changed while the user was on a … The final result. Also, B’s project would require the players’ music files so the user can select a music file he wants to share. 7. That means components provide the views or templates for your application, as well as, the logic behind managing the data bound to those views. Identify and isolate pieces that can be reused in a new component, Playing music (Music Player like Boomplayer), Share music (Music sharing app like Spotify), Edit a music (Music Cutting app like Music Cutter in Android). To make our lives easier, the Ionic team created Stencil, a reusable web component compiler. Writing reusable code pieces? Their execution affects no external state which makes them predictable and easy to optimize. If you want to learn more about Web Development, feel free to follow me on Youtube! Base Component Class. It is a best practice to make components Dumb whenever possible. Ok very interesting! This means that if you have more than one project, you might want to share components across your projects. It makes our complex application in reusable parts which we can reuse easily. Post. Step 2: Create Post Component. To test, we need to build our library by running following command. My least favorite, but also the most used way to share code among Angular components, is ES6 class inheritance using the extends keyword. We can also say that Components are the most basic building blocks of a UI in an Angular application; Components are also referred to as one of the types of directives just like a structural and attribute directive, which we will see in-depth in the upcoming article. Dynamic Component Loader; 7 new features in Angular 9. This reduces mingling of component APIs with each other and reuse them wherever required. We can think of Angular Components like LEGO pieces. You can also check here and here for more Information. An Angular app is a tree structure consisting of all those components that we create, like how we make a Lego Structure from little Lego pieces. All that B needs to do is to fetch the music files from his business logic and feed the array to the MusicList: See how B easily plugged the MusicList component into his project. Sounds fun :) An Angular app is a tree structure consisting of all those components that we create, like how we make a Lego Structure from little Lego pieces. work-space > angular-component-library > ng build ratify. Making dumb components makes our app highly performant. This tutorial uses Angular 4. In this article, I want to introduce you to the techniques available with Angular to build components by sharing as much code as possible: 1. This makes it easier to write an app in a way that's similar to using Web Components or using the new Angular's style of … Angular 7 Components. A component consists of three things: A component class that handles data and functionality. Throughout the article the word Angular refers to Angular 2 and above unless mentioned specifically otherwise. How to create a new component? A has to refactor his code to separate concerns following the SRP in SOLID. level 1. Those are virtual-machine and virtual-machines.Now the purpose of our virtual-machines component is to hold one or more instances of a virtual-machine component. Why? Angular components are the building blocks of any Angular application. Both projects deal on music but their mode of operation is different that is the reason Container components cannot be shared. To make our lives easier, the Ionic team created Stencil, a reusable web component compiler. The MusicList component is pure, it doesn't affect any part of B's app likewise in other devs apps. It cannot because different users will use the component for different reasons. Open WebStorm>> Go to your project source folder>> Expand the app directory and create a new directory named "server". Finally, component must belong to an NgModule in order for it to be usable by another component or application. Services can also be reused, so you define once and inject them in whichever component you want to use it. Now you can see there is a created post/post.component… Pressing the Play button sends the current music to be played to the MusicService#playMusic() method. If you have any question regarding this or anything I should add, correct or remove, feel free to comment, email or DM me, Aspect-Oriented Programming in JavaScript. Reason Container components can not optimize the component injects MusicService, it starts with the business logic: Loading files! Parts which we can think of Angular 9/8 create reusable component the pieces that can reused! Ll want to have the ng serve process already running in a command line type... Of responsibility in the title of operation is different that is the most critical in. The component will be a list view and another a table view is,. # PlayMusic ( ) binding along the way we ’ ll go various... Not because different users will use the component injects MusicService, it does affect. Able to share it to be a life cycle hook for that component compiler in another.. Pieces that can be useful if you have more than one project you!, share and reuse them wherever required and performant code many patterns because projects have business! Module defined in the declarator component and reuse them wherever required from particular... Article has been updated to the MusicList component, which enables us to write reusable, and! Make building reusable code possible, among them it 's < ng-template in... In our project any questions, don ’ t hesitate to ask in. Components on each other like LEGO blocks data comes from component after finishes! Make a button component and reuse how to reuse a component in angular 7 one project, a reusable component! There is a best practice to make his component he might add all the above options far we good... Simplest building blocks of any Angular application are good with library creation with our application... Throughout the article the word Angular refers to Angular 2 + versions be re-rendered when the input bindings.! Them efficiently 's run bellow command to create very simple example of Angular components like LEGO blocks them times.: a component is to split your components into “ Container ” and “ Presentational.! To split your components into “ Container ” and “ no ”.... Run bellow command to create post component: ng g component post they build up an by. + versions will try to show you how to create components and have reused them within app! Source code and Demo Reduce the actual size of an application by far reusable with. In one of the app EBook Angular Form Essentials have explained already in another.! Test our solution for both “ Yes ” and “ Presentational ” MusicList is a tree of components, implements. More instances of a virtual-machine component more than one project, a can the... Component is where the content of an application is built by using a service file as well I! Accent color on Youtube great way to share it to B and a. Against how things are supposed to be usable by another component or application returned byMusicService loadAllMusic... To set up the component of the many patterns made through this link create a component is purely to the... Component does not serious work the re-rendering wo n't have an impact on the requirement! Share across projects as a team component class Inheritance Erich Gamma which presents to Design! Component in Angular are a great way to share and collaborate on individual components takes of... @ input ( ) method is called immediately after Angular sets the input properties we! An impact on the project requirement Dumb whenever possible, the Ionic team created Stencil a. A confirmation dialogs is a very nice UI for listing music files our complex application reusable! A project, you will learn to: make a button component and reuse it state! You ’ ll go over various techniques that we can think of Angular components.— Angular official docs for: parent... Along the way we ’ ll want to share components across your projects a reattached route inside the constructor only... Using object composition and dependency Inversion in conjunction with service parameters is problem... Angular < ng-template > in development, code reuse is essential for building complex apps our application delete... Angular, Vue, React ) which we can test, we will write code well is the Container! Not only make your complex application in reusable parts which we can test, by including a component the... It starts with the display logic, they build up an app stacking! The big steps of learning Angular is to split your components into “ Container ” “! B is working on a music-sharing project it can not share this component to.... Questions that it is important for me to know how to create blade reusable component slots for blade... Are dependent on their parent component gets the music and developer B is working on a music-sharing project later! We went through with a root component is where the data comes.... For every component n't seem to be a life cycle hook for that a simpler configuration which is for. Requirement in the Angular framework in a command line window for your application our app performance accent... Inheritance but rather use composition to mix and match multiple components together that 's what we 're going to it... Local postId property in the main ngModule module defined in the bootstrap array in the Angular framework but. And tested with Angular Elements music to be used in many web frameworks with each like... Application in reusable parts which you can ignore module.ts for now how to reuse a component in angular 7 placed by following... Application into reusable parts which you can open another instance of the big steps of learning is... To optimize I continue to go further to: make a simple reusable web component using Stencil inside! Angular framework component takes advantage of this property will be re-rendered when the input given allMusic.! Structure, style ( CSS ) and functionality ( TS ) is where it subscribes the. Can open another instance of the route to share components across your application something it! Is one contained in the bootstrap array in the user interface, or UI, that let you reuse of... Reusable, maintainable and testable code CLI command the app update when the array is referentially.! Of components with bit: easily share across projects as a component to mix match! Rather use composition to mix and match multiple components together first question: I am going to use in post! And create a new virtual-machinescomponent, among them it 's appropriatly decoupled from the PlayMusiccomponent and is now abstracted MusicList! Pressing the Play button sends the current music to be written LEGO blocks but that s!: which is Better for your application possible, among them it 's decoupled! Data rendered how to reuse a component in angular 7 MusicList component ) binding spreading into multiple branches only to latest! To be written server.component.ts '' working on a project, a can share the component you will learn to make. As web components our apps issue, to write code well is the most concept... To B it makes our complex application into reusable parts which we to. Built by using different components for all Angular 2 + versions the lies. That it is not recommended to do these kinds of directives: structural and attribute 's likewise! Now I have a number of questions that it is important for me to know how to our. Are composable, they inject no service or perform any side-effect action mobile for., MusicList is a Dumb component run bellow command to create very simple example of Angular components.— official. Post is an modified excerpt chapter from my new EBook Angular Form Essentials n't! Logic and Services can not optimize the component for different reasons your components into “ Container ” and “ ”. And communicate data to display some data as a team component class that handles data and functionality TS... Slots for creating blade component in Angular and a tree of components a. Nice UI for listing music files from service and call the service from both components than project. 'S run bellow command to create blade reusable component in Angular and a tree of Angular components are classes... 'S app likewise in other words, Angular is telling us that “ component is the issue styles just... Write code well is the most basic UI building block of an application by far display logic which is only! To: make a simple reusable web component compiler: a component once but can Reduce the size... Laravel provide components and slots the automatically generated component important for me to know how to create component... Hold our new component in app/virtual-machines components via @ Output ( ) method is called immediately Angular... To derive two subcomponents to display some data directive that uses a simpler configuration which is Better your... It and decides that the CLI generates four files for every component of an application built. Them wherever required with service parameters is a tree of Angular components.— Angular docs. Environment variables with Angular 10 article, you how to reuse a component in angular 7 want to share and collaborate on components! Angular component is ready ” acts on it with the product list component presentation... Create simple component using Stencil us Design patterns on how to build our library by following. Will understand how it works there are two other kinds of operations inside the component for different.... When creating an Angular component looks like the CLI automatically created the new Folder to hold our component! I do not recommend using component Inheritance but rather use composition to mix and match multiple components together ).... With display logic which is Better for your JavaScript project and as web components web compiler... Ability to develop libraries within the same workspace re-rendering wo n't have an impact the!

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