New in Symfony 4.1: Improved Bootstrap 4 form theme
Warning: This post is about an unsupported Symfony version. Some of this information may be out of date. Read the most recent Symfony Docs.
Tobias Nyholm and Mathieu Piot
in #26327, #26326, #26325, and #25715.
In Symfony 2.6 we added a Bootstrap theme for Symfony Forms to easily style all your forms based on Bootstrap, the most popular design framework. In Symfony 3.4 we updated the form theme for Bootstrap 4, which was still a beta version at that time.
Now that the stable version of Bootstrap 4 has been released, in Symfony 4.1 we've updated the form theme again for the latest Bootstrap changes and we've improved it with additional features.
Web accessibility is essential to create inclusive apps and services, and it's an integral part of our Symfony Diversity initiative. With much help from an accessibility expert, Sandra, we have made the Bootstrap 4 from theme compliant with the WCAG 2.0 standard.
The standard includes rules and guidelines to make content accessible for users with disabilities, including impaired vision, learning disabilities and limited movement.
The form theme now supports Bootstrap 4 custom forms, which allow to replace the default browser form elements.
Labels and Errors
In addition to minor tweaks and fixes, form errors are now rendered inside
<label> element to make sure there is a strong connection between the
error and its
<input>, as required by the WCAG 2.0 standard.
We're working on a new documentation article about Bootstrap 4 and Symfony. You can check the current proposal and suggest improvements or new contents.
How does it look
This is how the improved Bootstrap 4 form theme looks:
And this is how it looks when the form displays error messages:
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learning disabilities is duplicated ;)
Is the horizontal theme will be modified to support errors too?
Right now, because of the structure, there is not enough space to display "long" error messages.
If I'm not mistaked it supported only beta version of bootstrap 4, not final one :)
When I want to render form element without label (example render input name as a placeholder). Then invalid input field is rendered in red without error messages - because errors are inside label (which is not rendered).
For this case users will have to implement separate template :(