{"id":31399,"date":"2025-10-05T19:23:52","date_gmt":"2025-10-05T17:23:52","guid":{"rendered":"https:\/\/www.angulararchitects.io\/blog\/dynamic-forms-building-a-form-generator-with-signal-forms\/"},"modified":"2025-11-20T01:50:20","modified_gmt":"2025-11-20T00:50:20","slug":"dynamic-forms-building-a-form-generator-with-signal-forms","status":"publish","type":"post","link":"https:\/\/www.angulararchitects.io\/en\/blog\/dynamic-forms-building-a-form-generator-with-signal-forms\/","title":{"rendered":"Dynamic Forms: Building a Form Generator with Signal Forms"},"content":{"rendered":"<div class=\"wp-post-series-box series-signal-forms-en wp-post-series-box--expandable\">\n\t\t\t<input id=\"collapsible-series-signal-forms-en69f70ccf2c266\" class=\"wp-post-series-box__toggle_checkbox\" type=\"checkbox\">\n\t\n\t<label\n\t\tclass=\"wp-post-series-box__label\"\n\t\t\t\t\tfor=\"collapsible-series-signal-forms-en69f70ccf2c266\"\n\t\t\ttabindex=\"0\"\n\t\t\t\t>\n\t\t<p class=\"wp-post-series-box__name wp-post-series-name\">\n\t\t\tThis is post 1 of 3 in the series <em>&ldquo;Signal Forms&rdquo;<\/em>\t\t<\/p>\n\t\t\t<\/label>\n\n\t\t\t<div class=\"wp-post-series-box__posts\">\n\t\t\t<ol>\n\t\t\t\t\t\t\t\t\t<li><span class=\"wp-post-series-box__current\">Dynamic Forms: Building a Form Generator with Signal Forms<\/span><\/li>\n\t\t\t\t\t\t\t\t\t<li><a href=\"https:\/\/www.angulararchitects.io\/en\/blog\/all-about-angulars-new-signal-forms\/\">Angular Signal Forms &#8211; Everything You Need to Know<\/a><\/li>\n\t\t\t\t\t\t\t\t\t<li><a href=\"https:\/\/www.angulararchitects.io\/en\/blog\/migrating-to-angular-signal-forms-interop-with-reactive-forms\/\">Migrating to Angular Signal Forms: Interop with Reactive Forms<\/a><\/li>\n\t\t\t\t\t\t\t<\/ol>\n\t\t<\/div>\n\t<\/div>\n<p>Dynamic Forms built by a form generator have quite a history in Angular. Such form generators enable us to build a form at runtime using metadata, such as field names and validation rules. A typical use cases are situations where the user defines types or extensions to existing types.<\/p>\n<p>With Reactive Forms, building such form generators was quite easy. In this article, I show how we can achieve the same with Angular's new Signal Forms (experimental).<\/p>\n<p>\ud83d\udcc2 <a href=\"https:\/\/github.com\/manfredsteyer\/modern\/tree\/dynamic-forms\">Source Code<\/a> (\ud83d\udd00 branch <code>dynamic-forms<\/code>)<\/p>\n<h2>Consumer's Perspective<\/h2>\n<p>Before we look at the implementation of the forms generator, let's discuss the consumer's perspective: They just provide an array with <code>FieldDef<\/code> objects that provide metadata describing the form:<\/p>\n<pre><code class=\"language-typescript\">@Component([...])\nexport class FlightEditComponent {\n\n  [...]\n\n  meta: FieldDef[] = [\n    { name: &#039;id&#039;, label: &#039;Id&#039;, required: true },\n    {\n        name: &#039;from&#039;,\n        label: &#039;From&#039;,\n        required: true,\n        minLength: 3,\n        maxLength: 20,\n    },\n    { name: &#039;to&#039;, label: &#039;To&#039;, required: true, minLength: 3, maxLength: 20 },\n    { name: &#039;date&#039;, label: &#039;Date&#039;, required: true, type: &#039;datetime-local&#039; },\n    { name: &#039;delayed&#039;, label: &#039;Delayed&#039;, type: &#039;checkbox&#039; },\n ];\n\n  \/\/ Let&#039;s assume we don&#039;t know the structure of the entity\n  \/\/ upfront but we have fitting meta data\n  entity = [...] as WritableSignal&lt;unknown&gt;;\n  dynamicForm = form(this.entity, toSchema(this.meta));\n\n  [...]\n}<\/code><\/pre>\n<p>A function <code>toSchema<\/code> converts this metadata into a schema used by Signal Forms. The form function takes the entity to display and the schema. The entity can be represented by a <code>Signal&lt;unknown&gt;<\/code> as we don't know about the shape of user-defined objects at compile-time.<\/p>\n<p>To render the form, the template delegates to a component <code>app-dynamic-form<\/code>:<\/p>\n<pre><code class=\"language-html\">&lt;form [...]&gt;\n\n  &lt;app-dynamic-form [metaInfo]=&quot;meta&quot; [dynamicForm]=&quot;dynamicForm&quot; \/&gt;\n\n [...]\n&lt;\/form&gt;<\/code><\/pre>\n<p>This results in the following form at runtime:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.angulararchitects.io\/wp-content\/uploads\/2025\/10\/dynamic-form.png\" style=\"width:100%; max-width:500px\"><\/p>\n<h2>Implementation<\/h2>\n<p>The implementation shown here is minimal to make it easier to convey the idea. Basically, we need a type FieldDef, a function toSchema, and a component for rendering the form. The type and the function are shown in the following listening: <\/p>\n<pre><code class=\"language-ts\">import { maxLength, minLength, required, Schema, schema } from &quot;@angular\/forms\/signals&quot;;\n\nexport interface FieldDef {\n  name: string;\n  label: string;\n  required?: boolean;\n  minLength?: number;\n  maxLength?: number;\n  type?: string;\n}\n\nexport function toSchema(meta: FieldDef[]): Schema&lt;unknown&gt; {\n  return schema&lt;unknown&gt;((path) =&gt; {\n    for (const fieldDef of meta) {\n      const prop = fieldDef.name;\n      const fieldPath = (path as any)[prop];\n\n      if (!fieldPath) {\n        continue;\n      }\n      if (fieldDef.required) {\n        required(fieldPath);\n      }\n      if (typeof fieldDef.minLength !== &#039;undefined&#039;) {\n        minLength(fieldPath, fieldDef.minLength);\n      }\n      if (typeof fieldDef.maxLength !== &#039;undefined&#039;) {\n        maxLength(fieldPath, fieldDef.maxLength);\n      }\n    }\n  });\n}<\/code><\/pre>\n<p>This function creates a <code>schema&lt;unknown&gt;<\/code> by iterating the meta data and describing the respective field by seting up validators. As the field names are not known at compile-time, we need to access their properties via index notation (brackets).<\/p>\n<p>The <code>app-dynamic-form<\/code> component gets the metadata and the entity passed. It iterates the metadata and renders respective fields:<\/p>\n<pre><code class=\"language-html\">@for(fieldDef of metaInfo(); track fieldDef.name) { \n\n    @let field = $any(dynamicForm())[fieldDef.name];\n\n&lt;div class=&quot;form-group&quot;&gt;\n  &lt;label&gt;\n    {{ fieldDef.label }}\n    &lt;input\n      [type]=&quot;fieldDef.type&quot;\n      [field]=&quot;field&quot;\n      [class.form-control]=&quot;fieldDef.type !== &#039;checkbox&#039;&quot;\n    \/&gt;\n  &lt;\/label&gt;\n  &lt;app-validation-errors\n    [errors]=&quot;field().errors()&quot;\n  &gt;&lt;\/app-validation-errors&gt;\n&lt;\/div&gt;\n}<\/code><\/pre>\n<h2>More: Modern Angular Workshop<\/h2>\n<p>Subscribe to our Modern Angular Workshop to stay up to date!<\/p>\n<p><a href=\"https:\/\/www.angulararchitects.io\/en\/training\/reaktive-angular-architekturen-mit-rxjs-und-ngrx-redux\/\"><img decoding=\"async\" src=\"https:\/\/www.angulararchitects.io\/wp-content\/uploads\/2025\/09\/modern.png\" style=\"max-width:600px; width:100%\"><\/a><\/p>\n<p><a href=\"https:\/\/www.angulararchitects.io\/en\/training\/reaktive-angular-architekturen-mit-rxjs-und-ngrx-redux\/\">English Version<\/a> | <a href=\"https:\/\/www.angulararchitects.io\/en\/training\/reaktive-angular-architekturen-mit-rxjs-und-ngrx-redux\/\">German Version<\/a> <\/p>\n<h2>Conclusion<\/h2>\n<p>This example demonstrates how Signal Forms can be used to build a simple dynamic form generator. By leveraging metadata such as field names and validation rules, a form can be created at runtime without knowing the shape of the underlying object at compile time.<\/p>\n<p>The implementation is intentionally kept minimal to clearly illustrate the core idea:<\/p>\n<ul>\n<li>Metadata is converted into a schema,<\/li>\n<li>the schema is bound to a signal-based form,<\/li>\n<li>and a generic component handles the rendering of the fields.<\/li>\n<\/ul>\n<p>In real-world scenarios, this approach can easily be extended to support:<\/p>\n<ul>\n<li>Arrays and form groups,<\/li>\n<li>Additional validators,<\/li>\n<li>or more complex UI components.<\/li>\n<\/ul>\n<p>Signal Forms thus provide a flexible and powerful foundation for building dynamic forms.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is post 1 of 3 in the series &ldquo;Signal Forms&rdquo; Dynamic Forms: Building a Form Generator with Signal Forms Angular Signal Forms &#8211; Everything You Need to Know Migrating to Angular Signal Forms: Interop with Reactive Forms Dynamic Forms built by a form generator have quite a history in Angular. Such form generators enable [&hellip;]<\/p>\n","protected":false},"author":25,"featured_media":31395,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[18],"tags":[],"class_list":["post-31399","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","post_series-signal-forms-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dynamic Forms: Building a Form Generator with Signal Forms - ANGULARarchitects<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.angulararchitects.io\/en\/blog\/dynamic-forms-building-a-form-generator-with-signal-forms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dynamic Forms: Building a Form Generator with Signal Forms - ANGULARarchitects\" \/>\n<meta property=\"og:description\" content=\"This is post 1 of 3 in the series &ldquo;Signal Forms&rdquo; Dynamic Forms: Building a Form Generator with Signal Forms Angular Signal Forms &#8211; Everything You Need to Know Migrating to Angular Signal Forms: Interop with Reactive Forms Dynamic Forms built by a form generator have quite a history in Angular. 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