Angular

A Guide to (Typed) Reactive Forms in Angular - Part I (The Basics)

Jun 20, 2023

4 min read

When building a simple form with Angular, such as a login form, you might choose a template-driven approach, which is defined through directives in the template and requires minimal boilerplate. A barebone login form using a template-driven approach could look like the following:

<!-- login.component.html -->
<form name="form" (ngSubmit)="myAuthenticationService.login(credentials)">
    <label for="email">E-mail</label>
    <input type="email" id="email" [(ngModel)]="credentials.email" required email />
    <label for="password">Password</label>
        <input type="password" id="password" [(ngModel)]="credentials.password" required />
    <button type="submit">Login!</button>
</form>

// login.component.ts
import { Component } from '@angular/core';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html'
})

export class LoginComponent implements OnInit {
  public credentials = {
    email: '',
    password: ''
  };

  constructor(public myAuthenticationService: MyAuthenticationService) { }
}

However, when working on a user input-heavy application requiring complex validation, dynamic fields, or a variety of different forms, the template-driven approach may prove insufficient. This is where reactive forms come into play.

Reactive forms employ a reactive approach, in which the form is defined using a set of form controls and form groups. Form data and validation logic are managed in the component class, which updates the view as the user interacts with the form fields. This approach requires more boilerplate but offers greater explicitness and flexibility.

In this three-part blog series, we will dive into the reactive forms data structures, learn how to build dynamic super forms, and how to create custom form controls.

In this first post, we will familiarize ourselves with the three data structures from the @angular/forms module:

FormControl

The FormControl class in Angular represents a single form control element, such as an input, select, or textarea. It is used to track the value, validation status, and user interactions of a single form control. To create an instance of a form control, the FormControl class has a constructor that takes an optional initial value, which sets the starting value of the form control. Additionally, the class has various methods and properties that allow you to interact with and control the form control, such as setting its value, disabling it, or subscribing to value changes.

As of Angular version 14, the FormControl class has been updated to include support for typed reactive forms - a feature the Angular community has been wanting for a while. This means that it is now a generic class that allows you to specify the type of value that the form control will work with using the type parameter <TValue>. By default, TValue is set to any, so if you don't specify a type, the form control will function as an untyped control.

If you have ever updated your Angular project with ng cli to version 14 or above, you could have also seen an UntypedFormControl class. The reason for having a UntypedFormControl class is to support incremental migration to typed forms. It also allows you to enable types for your form controls after automatic migration.

Here is an example of how you may initialize a FormControl in your component.

import { FormControl } from '@angular/forms';

const nameControl = new FormControl<string>("John Doe");

Our form control, in this case, will work with string values and have a default value of "John Doe".

If you want to see the full implementation of the FormControl class, you can check out the Angular docs!

FormGroup

A FormGroup is a class used to group several FormControl instances together. It allows you to create complex forms by organizing multiple form controls into a single object. The FormGroup class also provides a way to track the overall validation status of the group of form controls, as well as the value of the group as a whole.

A FormGroup instance can be created by passing in a collection of FormControl instances as the group's controls. The group's controls can be accessed by their names, just like the controls in the group.

As an example, we can rewrite the login form presented earlier to use reactive forms and group our two form controls together in a FormGroup instance:

// login.component.ts
import { FormControl, FormGroup, Validators } from '@angular/forms';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html'
})

export class LoginComponent implements OnInit {
  public form = new FormGroup({
    email: new FormControl<string>('', [Validators.required, Validators.email]),
    password: new FormControl<string>('', [Validators.required]),
  });

  constructor(public myAuthenticationService: MyAuthenticationService) { }

  public login() {

    // if you hover over "email" and "password" in your IDE, you should see their type is inferred
    console.log({
      email: this.form.value.email,
      password: this.form.value.password
    });

    this.myAuthenticationService.login(this.form.value);
  }

}

<!-- login.component.html -->
<form name="form" (ngSubmit)="login()" [formGroup]="form">
    <label for="email">E-mail</label>
    <input type="email" id="email" formControlName="email" />
    <label for="password">Password</label>
        <input type="password" id="password" formControlName="password" />
    <button type="submit">Login!</button>
</form>

Notice we have to specify a formGroup and a formControlName to map the markup to our reactive form. You could also use a formControl directive instead of formControlName, and provide the FormControl instance directly.

FormArray

As the name suggests, similar to FormGroup, a FormArray is a class used to group form controls, but is used to group them in a collection rather than a group.

In most cases, you will default to using a FormGroup but a FormArray may come in handy when you find yourself in a highly dynamic situation where you don't know the number of form controls and their names up front.

One use case where it makes sense to resort to using FormArray is when you allow users to add to a list and define some values inside of that list. Let's take a TODO app as an example:

import { Component } from '@angular/core';
import { FormArray, FormControl, FormGroup } from '@angular/forms';

@Component({
  selector: 'app-todo-list',
  template: `
    <form [formGroup]="todoForm">
      <div formArrayName="todos">
        <div *ngFor="let todo of todos.controls; let i = index">
          <input [formControlName]="i" placeholder="Enter TODO name" />
        </div>
      </div>
      <button (click)="addTodo()">Add TODO</button>
    </form>
  `,
})
export class TodoListComponent {
  public todos = new FormArray<FormControl<string | null>>([]);

  public todoForm = new FormGroup({
    todos: this.todos,
  });

  addTodo() {
    this.todoForm.controls['todos'].push(new FormControl<string>(''));
  }
}

In both of the examples provided, we instantiate FormGroup directly. However, some developers prefer to pre-declare the form group and assign it within the ngOnInit method. This is usually done as follows:

// login.component.ts
import { FormControl, FormGroup, Validators } from '@angular/forms';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html'
})

export class LoginComponent implements OnInit {
  // predeclare the form group
  public form: FormGroup;

  constructor(public myAuthenticationService: MyAuthenticationService) { }

  ngOnInit() {
    // assign in ngOnInit
    this.form = new FormGroup({
      email: new FormControl<string>('', [Validators.required, Validators.email]),
      password: new FormControl<string>('', [Validators.required]),
    });
  }

  public login() {
    // no type inference :(
    console.log(this.form.value.email);
  }

}

If you try the above example in your IDE, you'll notice that the type of this.form.value is no longer inferred, and you won't get autocompletion for methods such as patchValue. This is because the FormGroup type defaults to FormGroup<any>. To get the right types, you can either assign the form group directly or explicitly declare the generics like so:

public form: FormGroup<{
  email: FormControl<string>,
  password: FormControl<string>,
}>;

However, explicitly typing all your forms like this can be inconvenient and I would advise you to avoid pre-declaring your FormGroups if you can help it.

In the next blog post, we will learn a way to construct dynamic super forms with minimal boilerplate.

This Dot is a consultancy dedicated to guiding companies through their modernization and digital transformation journeys. Specializing in replatforming, modernizing, and launching new initiatives, we stand out by taking true ownership of your engineering projects.

We love helping teams with projects that have missed their deadlines or helping keep your strategic digital initiatives on course. Check out our case studies and our clients that trust us with their engineering.

Jan Kaiser

Software engineer passionate about everything web-related. Particularly loves Angular, SCSS, TypeScript, soccer and dachshunds

@honzikec @honzikec

Overview of the New Signal APIs in Angular

Overview of the New Signal APIs in Angular Google's Minko Gechev and Jeremy Elbourn announced many exciting things at NG Conf 2024. Among them is the addition of several new signal-based APIs. They are already in developer preview, so we can play around with them. Let's dig into it, starting with signal-based inputs and the new matching outputs API. Signal Based Inputs Discussions about signal-based inputs have been taking place in the Angular community for some time now, and they are finally here. Until now, you used the @Input() decorator to define inputs. This is what you'd have to write in your component to declare an optional and a required input: ` With the new signal-based inputs, you can write much less boilerplate code. Here is how you can define the same inputs using the new syntax: ` It's not only less boilerplate, but because the values are signals, you can also use them directly in computed signals and effects. That, effectively, means you get to avoid computing combined values in ngOnChanges or using setters for your inputs to be able to compute derived values. In addition, input signals are read-only. The New Output I intentionally avoid calling them signal-based outputs because they are not. They still work the same way as the old outputs. The Angular team has just introduced a new output API that is more consistent with the latest inputs API and allows you to write less boilerplate, similar to the new input API. Here is how you would define an output until now: ` Here is how you can define the same output using the new syntax: ` The thing I like about the new output API is that sometimes it happens to me that I forget to instantiate the EventEmitter because I do this instead: ` You won't forget to instantiate the output with the new syntax because the output function does it for you. Signal Queries I am sure most readers know the @ViewChild, @ViewChildren, @ContentChild, and @ContentChildren decorators very well and have experienced the pain of triggering the infamous ExpressionChangedAfterItHasBeenCheckedError or having the values unavailable when needed. Here is a refresher on how you would use these decorators until now: ` With the new signal queries, similar to the new input API, the values are signals, and you can use them directly in computed signals and effects. You can define the same queries using the new syntax: ` Jeremy Elbourn mentioned that the new signal queries have better type inference and are more consistent with the new input and output APIs. He also showcased a brand new feature not available with the old queries. You can now define a query as required, and the Angular compiler will throw an error if the query has no result, guaranteeing that the value won't be undefined. Here is how you can define a required query: ` Model Inputs Jeremy and Minko announced the last new feature is the model inputs. The name is vague, but the feature is cool—it simplifies the definition of two-way bindings. Until now, to achieve two-way binding, you would have to define an input and an output following a given naming convention. @Input and @Output had to be defined with the same name (followed by "Change" in the case of the output). Then, you could use the template's [()] syntax. ` ` That way, you could keep the value in sync between the parent and the child component. With the new model inputs, you can define a two-way binding with a single line of code. Here is how you can define the same two-way binding using the new syntax: ` The html template stays the same: ` The model function returns a writable signal that can be updated directly. The value will be propagated back to any two-way bindings. Conclusion The new signal-based APIs are a great addition to Angular. They allow you to write less boilerplate code and make your components more reactive. The new APIs are already in developer preview, so you can start playing around with them today. I look forward to seeing how the community will adopt these new features and what other exciting things the Angular team has in store for us, such as zoneless apps by default....

Apr 3, 2024

3 mins

AngularJavaScript

Using HttpClient in Modern Angular Applications

Introduction With all the wonderful treats that the Angular team has given us during the recent "renaissance" era, many new developers are joining in on the fun. And one of the challenges they'll face at some point is how to call an API from your Angular application properly. Unfortunately, while searching for a guide on how to do this, they might stumble upon a lot of outdated information. Hence, this article should serve as a reliable guide on how to use the HttpClient in Angular >= 17. The Setup To make an HTTP request in Angular, you can take advantage of the HttpClient provided by the @angular/common/http package. To use it, you'll need to provide it. Here's how you can do that for the whole application using the bootstrapApplication function from @angular/platform-browser: ` With that, you should be good to go. You can now inject the HttpClient into any service or component in your application. Using HttpClient in Services Let's take a common example: You have a database object, say a Movie, and you want to implement CRUD operations on it. Typically, you'll want to create a service that provides methods for these operations. Let's call this service MovieService and create a skeleton for it with a method for getting all movies. ` Implementing the Method using HttpClient Let's assume we have a GraphQL API for our movies. We can implement our getAllMovies using HttpClient to make a request to fetch all movies. First, we will need to define a new type to represent the response from the API. This is especially important when you are using GraphQL, which may return a specific structure, such as: ` When working with a real API, you'll likely use some code generator to generate the types for the response from the GraphQL schema. But for the sake of this example, we'll create an interface to represent the response manually: ` Now, we can implement the getAllMovies method using HttpClient: ` > Note: The post method is used here because we are sending a request body. If you are making a GET request (e.g. to a REST API), you can use the get method instead. The getAllMovies method returns an Observable of MoviesListResponse. In this example, I have typed it explicitly to make it obvious at first glance, but you could also omit the type annotation, and TypeScript should infer it. > Note: While I'm excited about signals as much as the next guy, making HTTP requests is one of the typical async operations for which RxJS Observables are a perfect fit, making a great argument for RxJS still having a solid place in Angular alongside signals. Using the Service in a Component Now that we have our MovieService set up, we can use it as a component to fetch and display all movies. But first, let's create a Movie interface to represent the structure of a movie. Trust me, this will prevent many potential headaches down the line. Although using any at the beginning and implementing the types later is a valid approach in some cases, using data fetched from an API without validating the type will inevitably lead to bugs that are difficult to solve. ` Now, we can start implementing our standalone MoviesComponent: ` In this component, we are calling the getAllMovies method from the MovieService in the constructor to fetch all movies and assign them to the movies property which we will use to display the movies in the template. ` In this case, placing our code inside the constructor is safe because it doesn’t depend on any @Input(). If it were, our code would fail because the inputs aren’t initialized at time of instantiation. That's why it is sometimes recommended to place logic in ngOnInit instead. You could also put this call in an arbitrary method that is called e.g. on a button click. Another way to handle the subscription is to use the async pipe in the template. This way, Angular will automatically subscribe and unsubscribe from the observable for you and you won't have to assign the response to a property in the component. Due to the structure of the returned data, however, we'll need to use the RxJS map operator to extract the movies from the response. ` > Note using the pipe method to chain the map operator to the observable returned by getAllMovies. This is a common pattern when working with RxJS observables introduced in RxJs 5.5. If you see code that uses the map operator directly on the observable and wonder why it isn't working for you, it's likely using an older version of RxJS. Now, we can simply apply the async pipe in the template to subscribe to the observable and display the movies: ` Conclusion HttpClient in Angular is pretty straightforward, but with all the changes to RxJS and Angular in the past few years, it can pose a significant challenge if you're not super-experienced with those technologies and stumble upon outdated resources. Following this article, you should hopefully be able to implement your service using HttpClient to make requests to an API in your modern Angular application and avoid the struggle of copying outdated code snippets....

Mar 27, 2024

4 mins

AngularJavaScript

New Core Web Vitals and How They Work

Core Web Vitals, introduced by Google in 2020, have been around for a while now. And after four years, a significant change is coming in March 2024. In this article, I will try to tell you everything you need to know to be prepared. But first, let's briefly talk about what Core Web Vitals are. What are Core Web Vitals? Web Vitals is a Google initiative that aims to provide developers with guidance on authoring the best user experience on the web as well as tools to assess and measure it. Core Web Vitals are a subset of Web Vitals and currently consist of three main metrics: - Largest Contentful Paint (LCP): This metric measures the time it takes for the largest content element to be rendered on the screen. It should reflect the _loading_ aspect of the user experience. - First Input Delay (FID): This metric measures the time it takes for the browser to respond to the first user interaction. It should reflect the _interactivity_ aspect of the user experience. - Cumulative Layout Shift (CLS): This metric measures the amount of unexpected layout shifts of visual elements on the page. It should reflect the _visual stability_ aspect of the user experience. Part of the Core Web Vitals are also the thresholds that define what is considered a good experience. These thresholds are currently set to: | Metric | Good | Needs Improvement | Bad | | ------ | -------- | ----------------- | -------- | | LCP | ≤ 2.5 s | 2.5 - 4 s | > 4 s | | FID | ≤ 100 ms | 100 - 300 ms | > 300 ms | | CLS | ≤ 0.1 | 0.1 - 0.25 | > 0.25 | While the reward of providing a good user experience should be enough for you to strive for great results in these metrics, that is not the only reason you should care about them. Google is reflecting these metrics in its search ranking algorithm as it wants it to "reward content that offers good user experience". What's Changing in March 2024? The change affects how _interactivity_ is measured. The First Input Delay (FID) has been deemed no longer sufficient to measure the interactivity aspect of the user experience. It will be replaced by the Interaction to Next Paint (INP) metric on March 12, 2024. INP, unlike FID, measures the response of all interactions up to a URL change. It then picks the slowest response from all interactions. (If there are more than 50 interactions, it picks a percentile instead, most often the 98th) making it much stricter than FID. Why the Change? There are three main reasons why FID is being replaced by INP: 1. FID is not strict enough: Upwards of 90% of websites meet the good threshold for FID nowadays, making it a poor differentiator between good and bad user experiences. 2. FID is not representative of the full interaction: FID only measures the first part of the reaction delay, up to the point before the response bubbles to JavaScript, not accounting for the (often quite long) time it takes for the JavaScript to process the response and for the browser to paint the next frame. 3. FID only measures the first interaction: According to Google, 90% of interactions happen _after_ the first load, making FID not representative of the full user experience. INP aims to address these issues by measuring the full interaction and by being stricter in its thresholds (according to Google, ~70% of websites should pass the good INP threshold now) and thus capturing a more representative picture of the user experience. How Does INP Work? As I previously mentioned, INP measures all interactions on the page and picks the slowest one or a percentile, which solves one of the issues with FID not representing the whole experience of interacting with a website. This way of measuring is not dissimilar to how CLS measures the unexpected layout shifts on the page as it also captures the full scope of the stay on the page. The interactions considered by INP are: - Mouse clicks - Touchscreen taps - Keyboard presses (including virtual onscreen keyboards) If an interaction is composed of multiple events, such as a keystroke, consisting of the keydown, keypress, and keyup events; INP groups them and measures the latency as the maximum duration of all the included events. Unlike FID, it captures not only the time taken by tasks blocked by the main thread (the _input delay_) but also the _processing time_ (events and JavaScript processing) and the _presentation delay_ (the time it takes for the browser to paint the next frame), making it a much better reflection of the full user experience, but also much harder to pass. So while FID reflects the first impression, INP should capture the overall _responsiveness_ of a page. For more information about interactions with comprehensive diagrams of what actually happens in the browser, check out the web.dev article on INP. Google defined the thresholds for INP as follows: | Metric | Good | Needs Improvement | Bad | | ------ | -------- | ----------------- | -------- | | INP | ≤ 200 ms | 200 - 500 ms | > 500 ms | How to Prepare for INP? Let's start with some general steps you should take to prepare for the new Web Vital: 1. Measure Start with measuring your INP score. The easiest way to measure it is using PageSpeed Insights, but if you need to measure it locally, you can use Lighthose user flows which already support INP. If your INP scores are _good_, you're fine and you can probably stop reading further. 2. Do not panic While, according to Tim Kadlec, only 17% of React websites and 11.8% of Next.js websites in the "top 100k" pass the _good_ INP threshold, so it's very likely that you will have to do some work to pass; framework authors have been working on improving their performance and things may be as hot as Tim paints them. According to Google’s stats, ~80-90% of desktop sites pass the _good_ INP threshold depending on the framework as of June 2023: | Technology | Passing on Mobile [%] | Passing on Desktop [%] | | ----------------- | --------------------- | ---------------------- | | Angular (v2.0.0+) | 28.6 | 83.6 | | Next.js | 28.5 | 87.3 | | Nuxt.js | 32.0 | 91.2 | | Preact | 48.6 | 92.8 | | Vue (v2.0.0+) | 50.3 | 94.1 | | Lit | 50.0 | 88.3 | 3. Optimize In case your INP scores are not _good_, you should start optimizing your website. Identify the pages that perform the worst and start with them. Focus on: - Code splitting and tree shaking to make sure only the necessary JavaScript is included. - Deferring non-critical JavaScript events until the main thread is idle. Consider also offloading heavy tasks to a Web Worker. - Debouncing or throttling frequently fired events. - Breaking up long JavaScript tasks into smaller ones. - Using passive event listeners. - Reducing the presentational delay e.g. by using the will-change CSS property, and preferring transform and opacity over the display and position properties in animations. - Eliminating third-party scripts. Very often, third-party scripts, be it for analytics, cookie consent, or other purposes, have a significant impact on performance. Considering which of them are not absolutely necessary, and either removing them or replacing them with a more performant solution is highly recommended. - Upgrading your dependencies to make sure you are taking advantage of the latest performance-improving features. If you want to read more about the general INP optimization tips, you can check out this Vercel article. While a lot of these optimizations, such as code splitting and tree shaking, are already taken care of by modern frameworks, I believe that it’s worth going through this list to see what you can do to make your website faster and thus a better experience for your users. We will explore concrete performance tips for popular frameworks in the next article. Conclusion The change in Core Web Vitals is coming and it's going to be a significant one. The new metric, Interaction to Next Paint, is going to be much stricter than the current First Input Delay and it's going to be much harder to pass. However, the good news is that framework authors have already been working on making the frameworks more INP-friendly, and while it may take some effort, you should be able to improve your INP score. INP, however, should not be just another Lighthouse threshold we have to satisfy. This change should encourage us to look beyond surface-level metrics and dive deeper into the nuances of user interaction. As we adapt to these changes, our focus should remain on the end goal: creating a good and inclusive user experience for our visitors....

Feb 14, 2024

6 mins

JavaScriptWeb PerformanceUXSEO

Maximizing Server Rendering for Interactive Next.js Applications

Maximizing Server Rendering for Interactive Next.js Applications Next.js has come a long way since its inception, and it's now a powerful framework that combines both server-side and client-side rendering. With the introduction of React Server Components (RSCs) and the classic client components, you have the flexibility to create a purely client-rendered app with many client components or a purely server-rendered app using RSCs. However, what if you want to have the best of both worlds? Server rendering improves performance and can deliver much of the HTML quickly, reducing the need for the client to render the entire page. This also results in smaller bundles delivered to the client. The question is, how would you maximize server rendering while still having an interactive application? This blog post will show you how. Building a Lightweight Shopping Experience To illustrate the concept, we'll build a lightweight shopping experience with a list of products and an "Add to Cart" button that opens a drawer with the added cart items. Most of the page will be server-rendered, and we'll use client components only to show the drawer. Even the drawer itself will not be entirely a client component; rather, the wrapper necessary to show the drawer will be a client component, while the contents will be server-rendered. This can be accomplished by the nature of client components that can accept server-rendered content. We'll set up a React context provider at the layout level, which will control showing or hiding the cart. This provider will be used by our client components (the "Add to Cart" button and the "Show Cart" button), as well as by the drawer wrapper. When you click "Add to Cart," this will invoke a server action (more on that later), and then use a function provided through the context of the provider to show the drawer. The Code For this example, we'll use shadcn as our component library. It looks nice, and it also provides a good, accessible component for our cart drawer. Looking at our wireframe above, we'll need a total of three components: - Button - Table - Sheet The components can be installed with a single command: ` Next, we'll set up our React context provider: ` ` The provider provides a boolean flag to indicate whether the cart is currently shown (isCartShown) and a function to change that (setCartShown). Note that CartProvider is a client component, but its contents are provided as children. Therefore, CartProvider is just a thin client-component wrapper around its contents. Now, let's see the implementation of the "Add to Cart" button and the CartDrawer component. The AddToCartButton is a client component that reads the React context and calls its setCartShown function after adding to the cart has been completed. This will, in turn, set the isCartShown flag on the provider and show the cart drawer, which also reads the isCartShown flag from the provider. How is the cart updated, though? We'll use a server action named addToCartAction for that. We'll explain how this works in a bit, but in the meantime, let's see the implementations of the AddToCart button and the CartDrawer component. ` Similar to the CartProvider component, the' CartDrawer' component is a thin client component wrapper around its contents. It reads the React context provided by the CartProvider and passes it to the Sheet component from the Shadcn library. The SheetContent component accepts cart contents as children passed from the CartDrawer's parent, which is server-rendered. ` Using Server Actions and Cache Invalidation But how do we ensure that the contents are updated? The contents are an RSC component called CartContents that calls getCachedCart in the data access layer. In real-world scenarios, getCachedCart would probably call a database or an API, but we have neither here. So, we'll simulate a database through the use of the file-system-db package, a lightweight Node library that can write and read to a JSON file as a database. The get calls to the database are wrapped in unstable_cache, which allows us to tag such requests with cart. This means CartContents is initially fetching data from the tagged getCachedCart call. ` Whenever we mutate the cart, we want to call invalidateTags("cart"). This will force purging of Next.js caches and consequently re-render the cart. For example, the "Add to Cart" button calls the addToCartAction server action, which adds the item to the database and calls invalidateTags("cart"). This server action call returns an updated RSC payload to the client, which re-renders the part that depended on the getCachedCart call - and that is the CartContents component. ` ` And that's it. We now have a fully functional, mostly server-rendered cart, where only small bits of interactivity are modeled as client components. Here is the result: Some of the code shown above remains, such as the "Show Cart" button and the table of products, but those are just UX improvements on top of the core functionality. You can see the entire source code on Stackblitz. Wrapping Up In this blog post, we've explored how to maximize server rendering in Next.js while still having an interactive application. By leveraging React Server Components, client components, and server actions, we've created a shopping experience where most of the page is server-rendered, but the cart drawer is interactive and updates in real time. This approach improves performance, reduces the client-side rendering burden, and delivers smaller bundles to the client....

May 15, 2024

5 mins

NextJS

A Guide to (Typed) Reactive Forms in Angular - Part I (The Basics)

FormControl

FormGroup

FormArray

Jan Kaiser

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Overview of the New Signal APIs in Angular

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Maximizing Server Rendering for Interactive Next.js Applications

You might also like

Overview of the New Signal APIs in Angular

Using HttpClient in Modern Angular Applications

New Core Web Vitals and How They Work

Maximizing Server Rendering for Interactive Next.js Applications