Input width in bootstrap table always using max width - html

Question

Ok I was trying to do a table with input fields. To set the sizes of each field I understood that I had to set the col-size in the header.
<thead>
<tr>
<th class="col-sm-2">Large</th>
<th class="col-sm-2">Large</th>
<th class="col-sm-1">Small</th>
<th class="col-sm-2">Large</th>
<th class="col-sm-1">Small</th>
<th class="col-sm-2">Large</th>
<th class="col-sm-2">Large</th>
</tr>
</thead>
However the inputs expand to their max width with no regard to col-size.
http://jsfiddle.net/m79HR/
Possibly this is an improper use of Bootstrap but I saw it as a best bet for inline inputs with headers above.
Also, lets say I want this particular grid to have 18 columns instead of the default 12 is that possible here just in this particular case?

Answer 1

Just add the "form-control" class to the inputs and bootstrap takes care of the rest.
Doing it this way makes it easier to add columns or change the width, since you only have to change in the header as opposed to every row/input.
<table class="table table-condensed">
<thead>
<tr>
<th class="col-sm-12 col-md-4">Large</th>
<th class="col-sm-12 col-md-2">Small</th>
<th class="col-sm-12 col-md-2">Small</th>
<th class="col-sm-12 col-md-2">Small</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="text" class="form-control" />
</td>
<td>
<input type="text" class="form-control" />
</td>
<td>
<input type="text" class="form-control" />
</td>
<td>
<input type="text" class="form-control" />
</td>
</tr>
</tbody>
</table>

Answer 2

You need to use the class col-md-* for normal screens col-sm-* for tablet screen and col-xs-* for mobile screen, there is also col-lg-* for larger screens, you can combine all these classes to make it responsive, like:
<div class="row">
<div class="col-sm-12">
<table class="table table-bordered">
<thead>
<tr>
<th>Very Small</th>
<th>Very Small</th>
<th>Very Small</th>
<th>Large</th>
<th>Small</th>
<th>Medium</th>
</tr>
</thead>
<tbody>
<tr>
<td class="col-sm-1">
<input class="col-sm-12" placeholder="col-sm-1" />
</td>
<td class="col-sm-1">
<input class="col-sm-12" placeholder="col-sm-1" />
</td>
<td class="col-sm-1">
<input class="col-sm-12" placeholder="col-sm-1" />
</td>
<td class="col-sm-4">
<input class="col-sm-12" placeholder="col-sm-4" />
</td>
<td class="col-sm-2">
<input class="col-sm-12" placeholder="col-sm-2" />
</td>
<td class="col-sm-3">
<input class="col-sm-12" placeholder="col-sm-3" />
</td>
</tr>
</tbody>
</table>
</div>
</div>

Answer 3

For Bootstrap 4, you need to additionally add the d-flex class to the rows, like
<table>
<thead>
<tr class="d-flex">
<th class="col-3">3 columns wide header</th>
<th class="col-sm-5">5 columns wide header</th>
<th class="col-sm-4">4 columns wide header</th>
</tr>
</thead>
<tbody>
<tr class="d-flex">
<td class="col-3">3 columns wide content</th>
<td class="col-sm-5">5 columns wide content</th>
<td class="col-sm-4">4 columns wide content</th>
</tr>
</tbody>
</table>