Bootstrap 4 Components
Input groups allow you to combine text and form controls on a single line.
To do this you need class
.input-group to the create the input group and
.input-group-addon for the element you want to combine with that input.
Input group with a single addon
Input group with addons on both sides
Input group with more than one addons or either side
.input-group-sm to the to the input group and the contents of the input group will automatically resize themselves according to the size of the input group.
Radio inputs and Checkboxes as addon
Instead of text, use radio button or a checkbox to an inputs addon.
Buttons as Addon
When using buttons as addons in an input group the buttons must be wrapped inside the class
.input-group-btn. Like text Addons you can add multiple button addons on either side of the input.
Dropdown as Addons
Add a dropdown into the addon button by including a dropdown menu in the button.