{"id":3608,"date":"2026-04-09T13:44:32","date_gmt":"2026-04-09T11:44:32","guid":{"rendered":"https:\/\/www.thecodecampus.de\/blog\/?p=3608"},"modified":"2026-04-09T14:02:57","modified_gmt":"2026-04-09T12:02:57","slug":"angular-signal-forms-quick-reactive-forms","status":"publish","type":"post","link":"https:\/\/www.thecodecampus.de\/blog\/angular-signal-forms-quick-reactive-forms\/","title":{"rendered":"Signal Forms &#8211; Quickly create Reactive Forms in Angular"},"content":{"rendered":"<p><a href=\"https:\/\/www.thecodecampus.de\/blog\/angular-signal-forms-schnell-reactive-formulare\/\"><em><strong>Klicke hier, f\u00fcr die deutsche Version des Artikels.<\/strong><\/em><\/a><\/p>\n<h2>Signal Forms in Angular 21: The Fastest Way to Reactive Forms<\/h2>\n<p>Signal Forms, as the name already states, use Angular signals instead of RxJS Observables to achieve the desired reactivity in forms. Using signals leads to simplified code and improved performance compared to the older Reactive Forms approach, while providing a simpler API to interact with than RxJS Observables.<br \/>\nSignal Forms are still in developer preview, but will be a helpful tool when stable. This article covers the basics of this newly added Angular feature, making you ready to use its advantages in your own applications!<\/p>\n<p>If you want to learn more about the new Resource API and Angular in detail, visit one of our Angular courses:<\/p>\n<ul>\n<li>Angular Basic Training: <a href=\"https:\/\/www.thecodecampus.de\/schulungen\/angular\">https:\/\/www.thecodecampus.de\/schulungen\/angular<\/a><\/li>\n<li>Advanced Training: <a href=\"https:\/\/www.thecodecampus.de\/schulungen\/angular-advanced\">https:\/\/www.thecodecampus.de\/schulungen\/angular-advanced<\/a><\/li>\n<\/ul>\n<h2>Structure and Syntax of Signal-Based Forms<\/h2>\n<p>To create a Signal Form, you need the following parts:<\/p>\n<ul>\n<li>An interface describing how our data is shaped<\/li>\n<li>A signal holding this data<\/li>\n<li>Wrapping this signal in a form<\/li>\n<li>References to the Signal Form fields in the form template<\/li>\n<\/ul>\n<p>The next section will then cover how to add validation to our Signal Form.<\/p>\n<h3>The Logic: TypeScript Setup and Signal Definition<\/h3>\n<p>So first, we define a datatype <code>FormData<\/code>:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Type definition of our form data\">export interface FormData {\r\n  name: string;\r\n  email: string;\r\n  wantsNewsletter: boolean;\r\n}<\/pre>\n<p>Our form will ask the user for the following data:<\/p>\n<ul>\n<li>name of the user<\/li>\n<li>email of the user<\/li>\n<li>whether the user wants to receive a newsletter<\/li>\n<\/ul>\n<p>Now, we can create our <code>formSignal<\/code> in our <code>App<\/code> component, using some default initial data:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Signal Creation\">formSignal = signal&lt;FormData&gt;({\r\n  name: '',\r\n  email: '',\r\n  wantsNewsletter: true,\r\n});<\/pre>\n<p>and wrap it with the <code>form<\/code> function, to create our form:<\/p>\n<pre class=\"lang:ts decode:true\">myForm = form(this.formSignal);<\/pre>\n<p>This call to <code>form<\/code> creates a <code>FieldTree<\/code> object. This <code>FieldTree<\/code> represents the structure of our form as a tree and allows us to access every single form field through dot notation, and to possibly add validators and read validation errors. For more information, visit the <a href=\"https:\/\/angular.dev\/api\/forms\/signals\/FieldTree\">Angular API documentation<\/a>.<\/p>\n<h3>The Template: Integration into HTML Code<\/h3>\n<p>For now, this is all the TypeScript code that we need. All left to do is write markup for our form.<\/p>\n<p>We define our form with 2 normal input fields for the name and email, and one checkbox for the newsletter subscription. To link these input fields to our Signal Form <code>myForm<\/code>, we use the <code>formField<\/code> directive, to bind each input to the corresponding signal in the <code>FieldTree<\/code>.<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Form HTML template\">&lt;form&gt;\r\n  &lt;div&gt;\r\n    &lt;label&gt;\r\n      Name:\r\n      &lt;input [formField]=\"myForm.name\" \/&gt;\r\n    &lt;\/label&gt;\r\n  &lt;\/div&gt;\r\n\r\n  &lt;div&gt;\r\n    &lt;label&gt;\r\n      Email:\r\n      &lt;input [formField]=\"myForm.email\" \/&gt;\r\n    &lt;\/label&gt;\r\n  &lt;\/div&gt;\r\n\r\n  &lt;div&gt;\r\n    &lt;input type=\"checkbox\" [formField]=\"myForm.wantsNewsletter\" \/&gt;\r\n    Subscribe to Newsletter\r\n  &lt;\/div&gt;\r\n&lt;\/form&gt;<\/pre>\n<p>We also add a simple button into our form for submitting,<\/p>\n<pre class=\"lang:xhtml decode:true\" title=\"Submit button\">&lt;button (click)=\"submit()\" type=\"button\"&gt;Submit&lt;\/button&gt;<\/pre>\n<p>which uses the <code>submit()<\/code> function, so that we can test our Signal Form.<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Submit function\">submit(): void {\r\n  console.log(this.myForm().value());\r\n}<\/pre>\n<p>After entering some data and checking the console, we can see that our form automatically tracks the data given by the user, and we are ready to take the next step: validating the form input!<\/p>\n<h2>Reactive and type-safe: Validation with Signals<\/h2>\n<p>Of course, we also want to validate our form. How can we do this with Signal Forms? Fortunately, Signal Forms also provide access to built-in validators. This makes it very easy to define form validation: We just need to define, upon creating a form, how it should validate its fields, using the provided validators:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Defining validation for a Signal Form\">myForm = form(this.formSignal, (signalRoot) =&gt; {\r\n  required(signalRoot.name, { message: 'Please enter your name' });\r\n  required(signalRoot.email, { message: 'Please enter you email' });\r\n  email(signalRoot.email, { message: 'Please enter a valid email' });\r\n});<\/pre>\n<p>To specify the validation behavior, we additionally pass a function to the <code>form<\/code> function. This function receives the underlying signal of the form as an argument, and its body defines the validity checks we want to perform:<\/p>\n<ul>\n<li>A name is required<\/li>\n<li>An email address is required<\/li>\n<li>The given email address must be valid<\/li>\n<\/ul>\n<p>We also provide a helpful error message for each validation check. We can now use the errors possibly generated by the Signal Form and display them to the user:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Displaying errors\">&lt;form&gt;\r\n  &lt;div&gt;\r\n    &lt;label&gt;\r\n      Name:\r\n      &lt;input [formField]=\"myForm.name\" \/&gt;\r\n    &lt;\/label&gt;\r\n    @if (myForm.name().touched() &amp;&amp; myForm.name().invalid()) {\r\n      @for (error of myForm.name().errors(); track error) {\r\n        &lt;div class=\"error\"&gt;{{error.message}}&lt;\/div&gt;\r\n      }\r\n    }\r\n  &lt;\/div&gt;\r\n\r\n  &lt;div&gt;\r\n    &lt;label&gt;\r\n      Email:\r\n      &lt;input [formField]=\"myForm.email\" \/&gt;\r\n    &lt;\/label&gt;\r\n    @if (myForm.email().touched() &amp;&amp; myForm.email().invalid()) {\r\n      @for (error of myForm.email().errors(); track error) {\r\n        &lt;div class=\"error\"&gt;{{error.message}}&lt;\/div&gt;\r\n      }\r\n    }\r\n  &lt;\/div&gt;\r\n\r\n  &lt;div&gt;\r\n    &lt;input type=\"checkbox\" [formField]=\"myForm.wantsNewsletter\" \/&gt;\r\n    Subscribe to Newsletter\r\n  &lt;\/div&gt;\r\n  \r\n  &lt;button (click)=\"submit()\" type=\"button\" [disabled]=\"myForm.invalid()\"&gt;\r\n    Submit\r\n  &lt;\/button&gt;\r\n\r\n  &lt;\/div&gt;<\/pre>\n<p>And voil\u00e0, we just created our first Signal Form with validation!<\/p>\n<h2>Signal Forms vs. Reactive Forms<\/h2>\n<p>To highlight why Signal Forms make writing forms easier, we implement the same form using the <a href=\"https:\/\/angular.dev\/guide\/forms\/reactive-forms\">Reactive Forms<\/a> approach. We create our Form using <code>FormGroup<\/code> and <code>FormControl<\/code>, providing initial data and validators:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Reactive Form Creation\">myForm = new FormGroup({\r\n  name: new FormControl('', Validators.required),\r\n  email: new FormControl('', [Validators.required, Validators.email]),\r\n  wantsNewsletter: new FormControl(true),\r\n});<\/pre>\n<p>And reference the form fields in the template:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Reactive Form Template\">&lt;form [formGroup]=\"myForm\"&gt;\r\n  &lt;div&gt;\r\n    &lt;label&gt;\r\n      Name:\r\n      &lt;input formControlName=\"name\" \/&gt;\r\n    &lt;\/label&gt;\r\n    @if (myForm.controls.name.touched &amp;&amp; myForm.controls.name.invalid) {\r\n      &lt;div class=\"error\"&gt;\r\n        @if (myForm.controls.name.hasError('required')) {\r\n          Please enter your name\r\n        }\r\n      &lt;\/div&gt;\r\n    }\r\n  &lt;\/div&gt;\r\n\r\n  &lt;div&gt;\r\n    &lt;label&gt;\r\n      Email:\r\n      &lt;input formControlName=\"email\" \/&gt;\r\n    &lt;\/label&gt;\r\n    @if (myForm.controls.email.touched &amp;&amp; myForm.controls.email.invalid) {\r\n      &lt;div class=\"error\"&gt;\r\n        @if (myForm.controls.email.hasError('required')) {\r\n          Please enter your email\r\n        }\r\n        @if (myForm.controls.email.hasError('email')) {\r\n          Please enter a valid email\r\n        }\r\n      &lt;\/div&gt;\r\n    }\r\n  &lt;\/div&gt;\r\n\r\n  &lt;div&gt;\r\n    &lt;input type=\"checkbox\" formControlName=\"wantsNewsletter\" \/&gt;\r\n    Subscribe to Newsletter\r\n  &lt;\/div&gt;\r\n\r\n  &lt;button type=\"button\" (click)=\"submit()\" [disabled]=\"myForm.invalid\"&gt;\r\n    Submit\r\n  &lt;\/button&gt;\r\n&lt;\/form&gt;<\/pre>\n<p>Wait&#8230; This seems as easy as creating a Signal Form? Well yes, but that is due to the fact that we haven&#8217;t added our own reactivity to the form.<\/p>\n<h2>Why Signal Forms Are the Better Choice for Modern Apps<\/h2>\n<p>Imagine we want the email field only to be required if the user wants to receive the newsletter. We can add this to our Reactive Form by subscribing to the <code>wantsNewsletter<\/code> field and update the email validators upon change in the constructor of our form component:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Reactive Form Reactivity\">constructor() {\r\n  this.myForm.controls.wantsNewsletter.valueChanges\r\n    .pipe(takeUntilDestroyed())\r\n    .subscribe((value) =&gt; {\r\n      const emailControl = this.myForm.controls.email;\r\n      if (value) {\r\n        emailControl.setValidators([Validators.required, Validators.email]);\r\n      } else {\r\n        emailControl.clearValidators();\r\n      }\r\n      emailControl.updateValueAndValidity();\r\n    });\r\n}<\/pre>\n<p>This is the point where we have to deal with the underlying RxJS Observables of the Reactive Form. We have to be very careful to only subscribe to the observable as long as it is not destroyed, by calling <code>takeUntilDestroyed<\/code>, and updating the email validation state with <code>updateValueAndValidity<\/code> after changing the validators of the email field. This approach is error-prone and not as intuitive as the Signal Form approach, where we define the reactive validity together with our other validity rules:<\/p>\n<pre class=\"lang:ts decode:true\" title=\"Signal Form Reactivity\">myForm = form(this.formSignal, (signalRoot) =&gt; {\r\n  required(signalRoot.name, { message: 'Please enter your name' });\r\n  applyWhen(\r\n    signalRoot.email,\r\n    ({ valueOf }) =&gt; valueOf(signalRoot.wantsNewsletter),\r\n    (emailPath) =&gt; {\r\n      required(emailPath, { message: 'Please enter your email' });\r\n      email(emailPath, { message: 'Please enter a valid email' });\r\n    }\r\n  );\r\n});<\/pre>\n<p>We put the required and email validators inside a call to the <code>applyWhen<\/code> function. This function takes a field as a first argument, in our case the email field, which should be tested for validation only if a certain condition is met. This condition is specified by the second argument, in our case\u00a0<code>({ valueOf }) =&gt; valueOf(signalRoot.wantsNewsletter)<\/code>, as we only want to validate the email field if the newsletter checkbox is checked. We have to use the <code>valueOf<\/code> function here, as the validation function has no direct access to the values of the form fields. The third argument of <code>applyWhen<\/code> specifies the validation behavior as before.<\/p>\n<p>When we now uncheck the newsletter checkbox, we do not have to provide an email address.<\/p>\n<p>To conclude, Signal Forms have many advantages over the older Reactive Forms. Using signals makes them not only faster, but as you have seen in the given example, the code is really easy to write and understand. The only downside of Signal Forms is, that they currently are still an experimental feature and the API may change. So use them with care in production environments until they become stable.<\/p>\n<h2>Experience is the best teacher: Hands-on with Signal Forms<\/h2>\n<p>Are you ready to put theory into practice? The Stackblitz includes examples not only for Signal Forms but also for Reactive Forms, so you can try everything out right away in one place.<\/p>\n<p><iframe height=\"400\" style=\"width: 100%;\" src=\"https:\/\/stackblitz.com\/edit\/stackblitz-starters-cdfupkzf?embed=1&amp;file=src%2Fmain.ts\" scrolling=\"no\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<h2>What comes next?<\/h2>\n<p>Since Signal Forms have such a significant impact on developing reactive forms, we\u2019ll continue to explore them in upcoming articles. We\u2019ll look at how to use Signal Forms with custom controls and delve deeper into Signal Forms validation. <a href=\"https:\/\/www.thecodecampus.de\/blog\/angular-guide-signals-and-hot-topics\/\">You can also find an overview of all the latest articles and hot topics related to Angular in our Angular Guide.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Signal Forms, as the name already states, use Angular signals instead of RxJS Observables to achieve the desired reactivity in forms. Using signals leads to simplified code and improved performance compared to the older Reactive Forms approach, while providing a simpler API to interact with than RxJS Observables. Signal Forms are still in developer preview, but [&#8230;]<\/p>\n","protected":false},"author":44,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[73,198,163,168,169,162,183,199,167,95],"tags":[112,195,181,171,37,175,174,194,182],"class_list":["post-3608","post","type-post","status-publish","format-standard","hentry","category-angular","category-angular-21","category-angular-performance-optimization","category-angular-signals","category-change-detection","category-performance","category-reactive-programming","category-signal-forms","category-signals","category-validation","tag-angular","tag-angular-21","tag-angular-performance-optimization","tag-angular-signals","tag-performance","tag-reactive-programming","tag-rxjs","tag-signal-forms","tag-signals"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Signal Forms - Quickly create Reactive Forms in Angular<\/title>\n<meta name=\"description\" content=\"Faster to reactive forms: Angular 21 brings us Signal Forms! 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