Bootstrap Tutorial - Bootstrap Form Helper

Forms Helper Classes

There are several "helper" classes available from Bootstrap that help in displaying forms properly.

To show some custom text when a user enters invalid values in the input field, use a span element with class help-block.

The .help-block will appear below its corresponding input field when invalid values are entered.

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example of Twitter Bootstrap 3 Block Help Text</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
<style type="text/css">
    .bs-example{<!-- w  w w  . j a v  a  2s  .  c o m-->
      margin: 20px;
    }
</style>
</head>
<body>
<div class="bs-example">
    <form>
        <input type="text" class="form-control">
        <span class="help-block">A block of help text that breaks onto a new line and may extend beyond one line.</span>
    </form>
</div>
</body>
</html>

Click to view the demo

Static Form Control

To place plain text next to a form label within a horizontal form layout, use the .form-control-static class on a <p> element

<!--from   ww  w.  j a  v  a2  s  . com-->
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script> 
<style type="text/css">
    .bs-example{
      margin: 20px;
    }
  /* Fix alignment issue of label on extra small devices in Bootstrap 3.2 */
    .form-horizontal .control-label{
        padding-top: 7px;
    }
</style>
</head>
<body>
<div class="bs-example">
    <form class="form-horizontal">
        <div class="form-group">
            <label for="inputEmail" class="control-label col-xs-2">Email</label>
            <div class="col-xs-10">
                <p class="form-control-static">harrypotter@mail.com</p>
            </div>
        </div>
        <div class="form-group">
            <label for="inputPassword" class="control-label col-xs-2">Password</label>
            <div class="col-xs-10">
                <input type="password" class="form-control" id="inputPassword" placeholder="Password">
            </div>
        </div>
        <div class="form-group">
            <div class="col-xs-offset-2 col-xs-10">
                <div class="checkbox">
                    <label><input type="checkbox"> Remember me</label>
                </div>
            </div>
        </div>
        <div class="form-group">
            <div class="col-xs-offset-2 col-xs-10">
                <button type="submit" class="btn btn-primary">Login</button>
            </div>
        </div>
    </form>
</div>
</body>
</html>

Click to view the demo