I know that this question is pretty old, but I stumbled upon it recently, found a solution that I liked better, and figured I'd share it.
Now that Bootstrap 5 is available, there's a new approach that works similarly to using input-group
s, but looks more like an ordinary form, without any CSS tweaks:
<div class="row g-3 align-items-center">
<div class="col-auto">
<label>Label:</label>
</div>
<div class="col">
<input class="form-control">
</div>
<div class="col-auto">
<button type="button" class="btn btn-primary">Button</button>
</div>
</div>
The col-auto
class makes those columns fit themselves to their contents (the label and the button in this case), and anything with a col
class should be evenly distributed to take up the remaining space.