Bootstrap Forms – examples & tutorial

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.

Column sizing

As shown in the previous examples, our grid system allows you to place any number of .cols within a .row or .form-row. They’ll split the available width equally between them.

Custom forms

For even more customization and cross browser consistency, use our completely custom form elements to replace the browser defaults. They’re built on top of semantic and accessible markup, so they’re solid replacements for any default form control.

Customizing

Validation states can be customized via Sass with the $form-validation-states map. Located in our _variables.scss file, this Sass map is looped over to generate the default valid/invalid validation states.

Please note that we do not recommend customizing these values without also modifying the form-validation-state mixin.

// Sass map from `_variables.scss`// Override this and recompile your Sass to generate different states$form-validation-states:map-merge(("valid":("color":$form-feedback-valid-color,"icon":$form-feedback-icon-valid),"invalid":("color":$form-feedback-invalid-color,"icon":$form-feedback-icon-invalid)),$form-validation-states);// Loop from `_forms.scss`// Any modifications to the above Sass map will be reflected in your compiled// CSS via this loop.@each$state,$datain$form-validation-states{@includeform-validation-state($state,map-get($data,color),map-get($data,icon));}

Default (stacked)

By default, any number of checkboxes and radios that are immediate sibling will be vertically stacked and appropriately spaced with .form-check.

Disabled

Custom checkboxes and radios can also be disabled. Add the disabled boolean attribute to the <input> and the custom indicator and label description will be automatically styled.

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File browser

The recommended plugin to animate custom file input: bs-custom-file-input, that’s what we are using currently here in our docs.

The file input is the most gnarly of the bunch and requires additional JavaScript if you’d like to hook them up with functional Choose file… and selected file name text.

Choose file

Form controls

Textual form controls—like <input>s, <select>s, and <textarea>s—are styled with the .form-control class. Included are styles for general appearance, focus state, sizing, and more.

Be sure to explore our custom forms to further style <select>s.

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.

Form row

You may also swap .row for .form-row, a variation of our standard grid row that overrides the default column gutters for tighter and more compact layouts.

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.

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.

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Inline

Group checkboxes or radios on the same horizontal row by adding .form-check-inline to any .form-check.

Inline forms

Use the .form-inline class to display a series of labels, form controls, and buttons on a single horizontal row. Form controls within inline forms vary slightly from their default states.

You may need to manually address the width and alignment of individual form controls with spacing utilities (as shown below). Lastly, be sure to always include a <label> with each form control, even if you need to hide it from non-screenreader visitors with .sr-only.

Overview

Bootstrap’s form controls expand on our Rebooted form styles with classes. Use these classes to opt into their customized displays for a more consistent rendering across browsers and devices.

Be sure to use an appropriate type attribute on all inputs (e.g., email for email address or number for numerical information) to take advantage of newer input controls like email verification, number selection, and more.

Here’s a quick example to demonstrate Bootstrap’s form styles. Keep reading for documentation on required classes, form layout, and more.

Range inputs

Set horizontally scrollable range inputs using .form-control-range.

Readonly plain text

If you want to have <input readonly> elements in your form styled as plain text, use the .form-control-plaintext class to remove the default form field styling and preserve the correct margin and padding.

Sizing

Set heights using classes like .form-control-lg and .form-control-sm.

Translating or customizing the strings

The :lang() pseudo-class is used to allow for translation of the “Browse” text into other languages. Override or add entries to the $custom-file-text Sass variable with the relevant language tag and localized strings.

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$custom-file-text:(en:"Browse",es:"Elegir");

Here’s lang(es) in action on the custom file input for a Spanish translation:

Seleccionar Archivo

Without labels

Add .position-static to inputs within .form-check that don’t have any label text. Remember to still provide some form of label for assistive technologies (for instance, using aria-label).

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