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Скачать или смотреть How to Create a Custom Validator for an Array of Form Groups in Angular's Reactive Forms

  • vlogize
  • 2025-05-28
  • 0
How to Create a Custom Validator for an Array of Form Groups in Angular's Reactive Forms
In reactive forms how do I create a custom validator that can validate an array of formGroup for noangularvalidationangular reactive formsangular validator
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Описание к видео How to Create a Custom Validator for an Array of Form Groups in Angular's Reactive Forms

Learn how to ensure that at least one item exists in an array of FormGroups in Angular's reactive forms with custom validators.
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This video is based on the question https://stackoverflow.com/q/65443276/ asked by the user 'punkouter' ( https://stackoverflow.com/u/193189/ ) and on the answer https://stackoverflow.com/a/65445351/ provided by the user 'Owen Kelvin' ( https://stackoverflow.com/u/13680115/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: In reactive forms how do I create a custom validator that can validate an array of formGroup for no values?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Introduction

When building forms in Angular, especially when dealing with dynamic fields like order items, it's common to want to enforce certain validation rules. One such rule might be to require the user to have at least one item in an array of form groups representing order items. In this guide, we will explore how to create a custom validator to achieve this in Angular’s reactive forms.

The Problem

In scenarios where our forms dynamically generate multiple form groups (like order items in an order page), we need a reliable way to validate that at least one item has been provided by the user. A simple validation technique would tell us if an individual control is valid, but validating an array of form groups is a bit more complex.

Objective

We want to create a custom validator that checks if the order items array is empty and returns an appropriate error message so that we can convey this back to the user if they haven't provided any order items.

Solutions

There are several ways to implement a custom validator for an array of FormGroups in Angular. Let’s discuss two effective methods.

Option 1: Using the Built-in Required Validator

The quickest way to ensure that at least one item exists in our orderItems array is to use Angular’s built-in required validator.

Implementation Steps

Define Your FormGroup: When creating your FormGroup, include the required validator for the orderItems array.

[[See Video to Reveal this Text or Code Snippet]]

Check for Errors: You can easily check whether the required validator has failed to indicate that the array is empty.

[[See Video to Reveal this Text or Code Snippet]]

Option 2: Creating a Custom Validator Function

If you need more custom behavior, you can create your own validator function. This is useful if you want to define additional logic or return custom error messages.

Implementation Steps

Create the Validator Function:

[[See Video to Reveal this Text or Code Snippet]]

Use the Custom Validator in Your FormGroup:

[[See Video to Reveal this Text or Code Snippet]]

Check for Custom Errors:
You can check for the specific error returned by your custom validator.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Validating an array of FormGroups in Angular’s reactive forms may seem tricky at first, but with these techniques, you can easily ensure that users cannot submit forms without adding at least one item. Whether you use the built-in validators or implement a custom solution, Angular provides the tools you need to maintain robust forms.

Feel free to implement these solutions in your own Angular projects, and let us know how they worked for you!

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