Learn how to efficiently disable or enable a button in Angular depending on the selected radio button

In order to disable the button when the remarks are marked as failed.

Here is an example scenario:

Imagine there is an array containing two to four items.

First example:

ITEM 1 -> FAILED -> Remarks (required)

ITEM 2 -> FAILED -> Remarks (required)

ITEM 3 -> FAILED -> Remarks (required)

ITEM 4 -> FAILED -> Remarks (required)

The button will be disabled until all textareas are filled in by the user.

Second example:

ITEM 1 -> FAILED -> Remarks (required)

ITEM 2 -> PASSED -> Remarks (optional)

ITEM 3 -> FAILED -> Remarks (required)

ITEM 4 -> FAILED -> Remarks (required)

The user needs to fill in the three textareas labeled as 'FAILED' in order for the button to become enabled.

ITEM 1 -> PASSED -> Remarks (optional)

ITEM 2 -> PASSED -> Remarks (optional)

ITEM 3 -> PASSED -> Remarks (optional)

ITEM 4 -> PASSED -> Remarks (optional)

The button will automatically become enabled in this case.

For code reference, visit: https://stackblitz.com/edit/ng-zorro-antd-start-xz4c93

Thank you in advance

javascriptangulartypescript

Answer №1

Here's How It Works

If you're wondering how to integrate form validation in Angular, check out this Angular Example.

By linking the [disabled] input of a button to a related variable in the form, you can control when the button is enabled. Here's an example:

<button class="mr-1" nz-button nzType="primary" type="button" [disabled]="!taskFormGroup.valid" [nzLoading]="formLoading" (click)="saveFormData()">
      <span translate>Submit</span>
</button>

This code snippet binds the validity status of the form to the button, ensuring that it remains disabled until the form is valid.

For a live demonstration, check out the updated StackBlitz.

Recent Updates

A newer version on StackBlitz showcases how a text area switches between required and optional based on a radio button selection.

The changes made include:

  • Introduction of types in TypeScript for more clarity

  • Simplified structure by removing nested lists in favor of using controls for placeholders

  • Each task now has its own form controls allowing individual validation, improving user feedback with CSS styling

  • The radio button's value change function now takes the task ID, enabling specific validations for each task's remarks field

  • Integration of [disabled] input binding to disable the button when the form is invalid

Answer №2

Modified: Give this a shot

<button [ngClass]="{disabled : !isValid}" (click)="isValid && onConfirm()">Confirm</button>

In the event that isValid is true, onConfirm will be triggered.

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