<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<div class="col-md-6">
<h1>Toggle fields based on form values</h1>
<p>Change the age field and see what happens</p>
<form method="POST">
<p>Name:
<input type="text" name="player_name" />
</p>
<p>Email:
<input type="text" name="player_email" />
</p>
<p>Age:
<select id="age" name="age">
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="0">Other</option>
</select>
</p>
<div id="parentPermission">
<p>Parent's Name:
<input type="text" name="parent_name" />
</p>
<p>Parent's Email:
<input type="text" name="parent_email" />
</p>
<p>You must have parental permission before you can play.</p>
</div>
<p align="center">
<input type="submit" value="Join!" />
</p>
</div>
</div>
</div>
</form>
//Purpose: toggle the visibility of fields depending on the value of another field
$(document).ready(function ()
{
toggleFields();
//call this first so we start out with the correct visibility depending on the selected form values
//this will call our toggleFields function every time the selection value of our underAge field changes
$("#age").change(function ()
{
toggleFields();
});
});
//Function: this toggles the visibility of the child field depending on the selected value of the parent
function toggleFields() {
if ($("#age").val() == 0)
$("#parentPermission").show();
else
$("#parentPermission").hide();
}
