CheckBox: Component gets invalid style, although it is not invalid

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Last Updated: 09 Oct 2025 14:12 by ADMIN

Holger

Created on: 30 Sep 2025 12:43

Category: CheckBox

Type: Bug Report

CheckBox: Component gets invalid style, although it is not invalid

When setting the Checkbox component to disabled while the form is marked as touched, the k-invalid class is applied to the checkbox control.

That's because of the implementation of the isControlInvalid property:

public get isControlInvalid(): boolean {
    return this.control && this.control.touched && !this.control.valid;
}

According to the Angular source code:

    /**
     * A control is `valid` when its `status` is `VALID`.
     *
     * @see {@link AbstractControl.status}
     *
     * @returns True if the control has passed all of its validation tests,
     * false otherwise.
     */
    get valid(): boolean;

So valid() returns false when `status` is DISABLED.

The `isControlInvalid`property should better implemented like this:

public get isControlInvalid(): boolean {
    return this.control && this.control.touched && this.control.invalid;
}

Please check this Stackblitz: https://stackblitz.com/edit/angular-dznoe1xj?file=src%2Fapp%2Fapp.component.ts

2 comments

ADMIN

Martin Bechev

Posted on: 09 Oct 2025 14:12

Hi Holger,

The fix is released in the dev version 20.1.0-develop.20.

https://www.telerik.com/kendo-angular-ui/components/installation/development-builds

This week or next one we will release an official version as well. Will be available here:

https://www.telerik.com/kendo-angular-ui/components/changelogs/kendo-angular-ui

Regards,
Martin Bechev
Progress Telerik

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ADMIN

Martin Bechev

Posted on: 07 Oct 2025 07:52

Hello Holger,

Thank you for the provided feedback.

We will look into this case and consider your suggestion. Once there is any update on the case, I will let you know here (by the end of the week).

As a token of gratitude for reporting this and for the time spent getting to know the source code, I updated your Telerik points.

Regards,

Martin Bechev
Progress Telerik

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