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Bootstrap/site/content/docs/5.0/forms/layout.md
Patrick H. Lauke eeb73e0ccf
Docs: forms accessibility cleanup (#31114)
* Expand on disabled fieldsets and faked buttons

include further advice/information on how to disable faked buttons for keyboard/AT users

* Centralise accessible name advice in forms overview

seems odd to only mention (separately) label, aria-label etc in input-group and layout. the advice is just as pertinent in other sections like select. checks only skims over this.

moving this, in expanded form, into the overview section itself. adding a specific cross-reference (just because they are easily left with no accname at all) in the checks page.

* Change warning about accessibility, modify server-side example

- paradoxically, due to our current problems with validation (see #28414) and the fact that browsers seem to have improved in this area for the most part, it's now actually better to use browser-native validation
- added explicit `id` and `aria-describedby` association to at least the server-side form error messages, to show how it should be done properly, and expanded the prose for that explaining this.

* Replace `.sr-only` with `.visually-hidden` in new addition

* Copy edits for clarity in parenthetical

* Copy and formatting tweaks

- Wordsmithing here and there
- Turns some hyphens into em dashes
- Turns a long running comma separated list into an unordered list
- Rearranges some copy just a bit

Co-authored-by: Mark Otto <markd.otto@gmail.com>
2020-07-11 21:38:43 +01:00

13 KiB

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docs Layout Give your forms some structure—from inline to horizontal to custom grid implementations—with our form layout options. forms true

Forms

Every group of form fields should reside in a <form> element. Bootstrap provides no default styling for the <form> element, but there are some powerful browser features that are provided by default.

  • New to browser forms? Consider reviewing the MDN form docs for an overview and complete list of available attributes.
  • <button>s within a <form> default to type="submit", so strive to be specific and always include a type.
  • You can disable every form element within a form with the disabled attribute on the <form>.

Since Bootstrap applies display: block and width: 100% to almost all our form controls, forms will by default stack vertically. Additional classes can be used to vary this layout on a per-form basis.

Utilities

[Margin utilities]({{< docsref "/utilities/spacing" >}}) are the easiest way to add some structure to forms. They provide basic grouping of labels, controls, optional form text, and form validation messaging. We recommend sticking to margin-bottom utilities, and using a single direction throughout the form for consistency.

Feel free to build your forms however you like, with <fieldset>s, <div>s, or nearly any other element.

{{< example >}}

{{< /example >}}

Form grid

More complex forms can be built using our grid classes. Use these for form layouts that require multiple columns, varied widths, and additional alignment options. Requires the $enable-grid-classes Sass variable to be enabled (on by default).

{{< example >}}

{{< /example >}}

Gutters

By adding [gutter modifier classes]({{< docsref "/layout/gutters" >}}), you can have control over the gutter width in as well the inline as block direction. Also requires the $enable-grid-classes Sass variable to be enabled (on by default).

{{< example >}}

{{< /example >}}

More complex layouts can also be created with the grid system.

{{< example >}}

Choose... ...
Sign in
{{< /example >}}

Horizontal form

Create horizontal forms with the grid by adding the .row class to form groups and using the .col-*-* classes to specify the width of your labels and controls. Be sure to add .col-form-label to your <label>s as well so they're vertically centered with their associated form controls.

At times, you maybe need to use margin or padding utilities to create that perfect alignment you need. For example, we've removed the padding-top on our stacked radio inputs label to better align the text baseline.

{{< example >}}

Radios
Checkbox
Sign in {{< /example >}}

Horizontal form label sizing

Be sure to use .col-form-label-sm or .col-form-label-lg to your <label>s or <legend>s to correctly follow the size of .form-control-lg and .form-control-sm.

{{< example >}}

{{< /example >}}

Column sizing

As shown in the previous examples, our grid system allows you to place any number of .cols within a .row. They'll split the available width equally between them. You may also pick a subset of your columns to take up more or less space, while the remaining .cols equally split the rest, with specific column classes like .col-sm-7.

{{< example >}}

{{< /example >}}

Auto-sizing

The example below uses a flexbox utility to vertically center the contents and changes .col to .col-auto so that your columns only take up as much space as needed. Put another way, the column sizes itself based on the contents.

{{< example >}}

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Choose... One Two Three
Submit
{{< /example >}}

You can then remix that once again with size-specific column classes.

{{< example >}}

@
Choose... One Two Three
Submit
{{< /example >}}

Inline forms

Use the .col-auto class to create horizontal layouts. By adding [gutter modifier classes]({{< docsref "/layout/gutters" >}}), we'll have gutters in horizontal and vertical directions. The .align-items-center aligns the form elements to the middle, making the .form-checkbox align properly.

{{< example >}}

@
Choose... One Two Three
Submit
{{< /example >}}