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Mark Otto 2017-06-11 16:24:20 -07:00
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docs/4.0/components/forms.md
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@ -817,17 +817,17 @@ We **highly recommend** custom validation styles as native browser defaults are
### How it works
Here's a rundown of how form validation works:
Here's how form validation works with Bootstrap:
- HTML form validation includes support for two CSS pseudo-classes, `:invalid` and `:valid`, on `<input>`, `<select>`, and `<textarea>` elements.
- Due to constaints 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.
- 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).
- As a fallback, `.is-invalid` and `.is-valid` classes are available for [server side validation](#server-side) (without the need for a `.was-validated` parent class).
- 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 constaints 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/forms.html#the-constraint-validation-api), a series of JavaScript methods for validating form controls.
- Feedback messages may utilize the browser defaults (different for each browser, and unstylable via CSS) or our custom feedback styles with additional HTML and CSS.
- Feedback messages may utilize the [browser defaults](#browser-default) (different for each browser, and unstylable via CSS) or our custom feedback styles with additional HTML and CSS.
- You may provide custom validity messages with `setCustomValidity` in JavaScript.
With that in mind, consider the following two demos for our custom form validation styles and browser defaults.
With that in mind, consider the following demos for our custom form validation styles, optional server side classes, and browser defaults.
### Custom styles