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[Docs] Clarify suggested use of custom validation styles, add note about resetting form appearance after validation #25628

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Feb 16, 2018
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[Docs] Clarify suggested use of custom validation styles, add note about resetting form appearance after validation #25628

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2448fc9
Expand/clarify recommendation for using custom validation styles
patrickhlauke Feb 14, 2018
cac9597
Add note about resetting form appearance after submission
patrickhlauke Feb 14, 2018
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3 changes: 2 additions & 1 deletion docs/4.0/components/forms.md
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Expand Up @@ -700,7 +700,7 @@ While Bootstrap will apply these styles in all browsers, Internet Explorer 11 an
Provide valuable, actionable feedback to your users with HTML5 form validation–[available in all our supported browsers](https://caniuse.com/#feat=form-validation). Choose from the browser default validation feedback, or implement custom messages with our built-in classes and starter JavaScript.

{% callout warning %}
We **highly recommend** custom validation styles as native browser defaults are not announced to screen readers.
We currently recommend using custom validation styles, as native browser default validation messages are not consistently exposed to assistive technologies in all browsers (most notably, Chrome on desktop and mobile).
{% endcallout %}

### How it works
Expand All @@ -709,6 +709,7 @@ Here's how form validation works with Bootstrap:

- HTML form validation is applied via CSS's two pseudo-classes, `:invalid` and `:valid`. It applies to `<input>`, `<select>`, and `<textarea>` elements.
- Bootstrap scopes the `:invalid` and `:valid` styles to parent `.was-validated` class, usually applied to the `<form>`. Otherwise, any required field without a value shows up as invalid on page load. This way, you may choose when to activate them (typically after form submission is attempted).
- To reset the appearance of the form (for instance, in the case of dynamic form submissions using AJAX), remove the `.was-validated` class from the `<form>` again after submission.
- As a fallback, `.is-invalid` and `.is-valid` classes may be used instead of the pseudo-classes for [server side validation](#server-side). They do not require a `.was-validated` parent class.
- Due to constraints in how CSS works, we cannot (at present) apply styles to a `<label>` that comes before a form control in the DOM without the help of custom JavaScript.
- All modern browsers support the [constraint validation API](https://www.w3.org/TR/html5/sec-forms.html#the-constraint-validation-api), a series of JavaScript methods for validating form controls.
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