Bootstrap 3 btn-group width - css

Question

I have another Bootstrap related problem.
I want to add radio and checkboxes to my form, I would like them also to take 100% width of form element.
I've added button group as this:
<div class="form-group">
<label class="col-sm-3 control-label">Subscribe</label>
<div class="col-sm-9">
<div class="btn-group input-group" data-toggle="buttons">
<label class="btn btn-success">
<input type="radio" name="options" id="option1" />Yes</label>
<label class="btn btn-primary">
<input type="radio" name="options" id="option2" />Maybe</label>
<label class="btn btn-danger">
<input type="radio" name="options" id="option3" />No</label>
</div>
</div>
</div>
This gives me nice radio-like buttons:
But as You can see they have fixed width. Can this be fixed with bootstrap classes?
Again here is my sample code: http://jsfiddle.net/Misiu/yy5HZ/5/

Answer 1

Use the built in .btn-group-justified class: Offical Docs
Make a group of buttons stretch at equal sizes to span the entire
width of its parent. Also works with button dropdowns within the
button group.
Anchors:
<div class="btn-group btn-group-justified" role="group" aria-label="Justified button group">
Left
Middle
Right
</div>
Buttons:
To use justified button groups with <button> elements, you must wrap
each button in a button group. Most browsers don't properly apply our
CSS for justification to <button> elements, but since we support
button dropdowns, we can work around that.
<div class="btn-group btn-group-justified" role="group" aria-label="Justified button group">
<div class="btn-group" role="group">
<button type="button" class="btn btn-default">Left</button>
</div>
<div class="btn-group" role="group">
<button type="button" class="btn btn-default">Middle</button>
</div>
<div class="btn-group" role="group">
<button type="button" class="btn btn-default">Right</button>
</div>
</div>
JSFiddle

Answer 2

You can simply use the bootstrap col-n classes so if you have 2 buttons you use col-xs-6 on them. The problem is when you have 5 buttons for example. There is no class for that in the bootstrap grid system. So I woul use one of the following:
To differenciate between groups with different number of buttons use additional custom classes:
JSFiddle
CSS
.btn-group {
width: 100%;
}
.btn-group-2 label.btn {
width: 50%;
}
.btn-group-3 label.btn {
width: 33.3%;
}
HTML
<div class="btn-group btn-group-3 input-group" data-toggle="buttons">
<label class="btn btn-success">
<input type="radio" name="options" id="option1" />Yes</label>
<label class="btn btn-primary">
<input type="radio" name="options" id="option2" />Maybe</label>
<label class="btn btn-danger">
<input type="radio" name="options" id="option3" />No</label>
</div>
If you want to avoid these css classes you can only use jQuery:
JSFiddle
$('.btn-group').each(function(index, item) {
$(item).find('.btn').css(
'width', 100 / $(item).find('.btn').length + '%'
)
});

Answer 3

Another solution:
.btn-group {
display: flex;
flex-direction: row;
}
.btn-group > button {
width: 100%;
}

Answer 4

For boostrap 4 the docs say you can do this:
Removed .btn-group-justified. As a replacement you can use <div class="btn-group d-flex" role="group"></div> as a wrapper around elements with .w-100.

Answer 5

You can just add a class of your own and give them a 33% width (for the 3 buttons) or 50% width (for the 2 buttons).

Answer 6

If #Schmalzy's solution doesn't work then you might be using Bootstrap v3.0.0, for which add the following styles in addition to the html markup in #Schmalzy's solution.
.btn-group-justified > .btn-group .btn {
width: 100%;
}
.btn-group-justified > .btn, .btn-group-justified > .btn-group {
display: table-cell;
float: none;
width: 1%;
}