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Angular Form Validation

Provide valuable, actionable feedback to your users with HTML5 form validation, via browser default behaviors or custom styles and Angular Forms Validation.

## Custom styles For custom CoreUI form validation messages, you'll need to add the `noValidate` boolean property to your `form`. This disables the browser default feedback tooltips, but still provides access to the form validation APIs in JavaScript. Try to submit the form below; our JavaScript will intercept the submit button and relay feedback to you. When attempting to submit, you'll see the `:invalid` and `:valid` styles applied to your form controls. Custom feedback styles apply custom colors, borders, focus styles, and background icons to better communicate feedback.

## Browser defaults Not interested in custom validation feedback messages or writing JavaScript to change form behaviors? All good, you can use the browser defaults with `ngNativeValidate`. Try submitting the form below. Depending on your browser and OS, you'll see a slightly different style of feedback. While these feedback styles cannot be styled with CSS, you can still customize the feedback text through JavaScript.

## Server side We recommend using client-side validation, but in case you require server-side validation, you can indicate invalid and valid form fields with `invalid` and `valid` boolean properties. For invalid fields, ensure that the invalid feedback/error message is associated with the relevant form field using `aria-describedby` (noting that this attribute allows more than one id to be referenced, in case the field already points to additional form text).

## Supported elements Validation styles are available for the following form controls and components: - `input cFormControl` - `select cSelect` - `c-form-check`

## Tooltips If your form layout allows it, you can swap the text for the tooltip to display validation feedback in a styled tooltip. Be sure to have a parent with `position: relative` on it for tooltip positioning. In the example below, our column classes have this already, but your project may require an alternative setup.

## Enhanced example With Angular validators.