fix(dbinput): inserting an empty string doesn't reset date form fields

[mfranzke]

Proposed changes

The condition for resetting a date related input wouldn't accept the empty string as a valid value, whereas this works perfectly fine with a native input[type="date"] HTML element.

resolves #5439

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/5439-dbinput-inserting-an-empty-string-doesnt-empty-date-form-fields

[changeset-bot]

🦋 Changeset detected

Latest commit: a7129d0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@db-ux/ngx-core-components	Patch
@db-ux/core-foundations	Patch
@db-ux/core-components	Patch
@db-ux/react-core-components	Patch
@db-ux/v-core-components	Patch
@db-ux/wc-core-components	Patch
@db-ux/core-stylelint	Patch
@db-ux/core-migration	Patch
@db-ux/agent-cli	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[Copilot]

Pull Request Overview

This PR fixes a bug where setting an empty string value on Angular date input fields would not clear the field, which differs from the native HTML input[type="date"] behavior. The fix modifies the writeValue method's condition to allow empty strings to pass through and clear date-related input types.

• Modified the Angular-specific writeValue overwrite to not return early when an empty string is passed for date/time input types
• Updated the Angular showcase to demonstrate resetting date inputs with an empty string

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/components/scripts/post-build/components.ts	Fixed the condition in the Angular writeValue overwrite to allow empty strings to clear date/time/week/month/datetime-local inputs
showcases/angular-showcase/src/app/components/form/form.component.ts	Updated the resetValues method to reset the date input field to an empty string instead of 'reset'

[Copilot]

According to the custom coding guidelines, when modifying existing components, you should adapt changes into the showcases/vue-showcase, showcases/angular-showcase and showcases/react-showcase folders. The Vue showcase's Form.vue and React showcase's form/index.tsx should also demonstrate the ability to reset date inputs to an empty string, similar to this Angular showcase change.

[Copilot]

According to the custom coding guidelines, you should start by writing a test to verify your solution. Consider adding a test in packages/components/src/components/input/input.spec.tsx that verifies date inputs can be cleared by setting the value to an empty string, ensuring this behavior matches native input[type="date"] elements.

[mfranzke]

@copilot open a new pull request to apply changes based on this feedback

[Copilot]

@mfranzke I've opened a new pull request, #5441, to work on those changes. Once the pull request is ready, I'll request review from you.