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Set heights and widths of forms with Bootstrap
Bootstrap provides classes to control form element heights and widths. Use .input-lg, .input-sm for height sizing, and grid classes like .col-lg-* for width control.
Height Sizing Classes
Bootstrap offers three height sizes for form controls:
-
.input-lg- Large height input - Default - Standard height (no class needed)
-
.input-sm- Small height input
Width Control with Grid System
Use Bootstrap's grid classes to control form element widths. Wrap inputs in .row and use column classes like .col-lg-2, .col-lg-3, etc.
Example
Here's how to implement different form sizes:
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Form Sizing</title>
<link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<script src="/scripts/jquery.min.js"></script>
<script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h3>Form Height Sizing</h3>
<form role="form">
<div class="form-group">
<input class="form-control input-lg" type="text" placeholder="Large input (.input-lg)">
</div>
<div class="form-group">
<input class="form-control" type="text" placeholder="Default input">
</div>
<div class="form-group">
<input class="form-control input-sm" type="text" placeholder="Small input (.input-sm)">
</div>
<h4>Select Elements</h4>
<div class="form-group">
<select class="form-control input-lg">
<option value="">Large select (.input-lg)</option>
</select>
</div>
<div class="form-group">
<select class="form-control">
<option value="">Default select</option>
</select>
</div>
<div class="form-group">
<select class="form-control input-sm">
<option value="">Small select (.input-sm)</option>
</select>
</div>
<h4>Width Control with Grid System</h4>
<div class="row">
<div class="col-lg-2">
<input type="text" class="form-control" placeholder=".col-lg-2">
</div>
<div class="col-lg-3">
<input type="text" class="form-control" placeholder=".col-lg-3">
</div>
<div class="col-lg-4">
<input type="text" class="form-control" placeholder=".col-lg-4">
</div>
</div>
</form>
</div>
</body>
</html>
Key Points
- Height classes (
.input-lg,.input-sm) work with inputs, selects, and textareas - Grid classes control width and must be wrapped in a
.rowcontainer - Combine height and width classes for precise control
- All sizing classes work with
.form-control
Conclusion
Bootstrap's sizing classes provide flexible form control over dimensions. Use .input-lg/.input-sm for height and grid classes for responsive width control.
Updated on: 2026-03-15T23:18:59+05:30
2K+ Views
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