jquery - How to limit the number of selected checkboxes?

Question

I have the following HTML:

<div class="pricing-levels-3">
  <p><strong>Which level would you like? (Select 3 Levels)</strong></p>
  <input class="single-checkbox"type="checkbox" name="vehicle" value="Bike">Level 1<br>
  <input class="single-checkbox" type="checkbox" name="vehicle" value="Bike">Level 2<br>
  <input class="single-checkbox" type="checkbox" name="vehicle" value="Bike">Level 3<br>
  <input class="single-checkbox" type="checkbox" name="vehicle" value="Bike">Level 4<br>
  <input class="single-checkbox" type="checkbox" name="vehicle" value="Bike">Level 5<br>
  <input class="single-checkbox" type="checkbox" name="vehicle" value="Bike">Level 6<br>
  <input class="single-checkbox" type="checkbox" name="vehicle" value="Bike">Level 7<br>
</div>

Live site:

http://www.chineselearnonline.com/amember/signup20.php

How can I do it so that the user can only select 3 of those checkboxes?

Answer 1

Using change event you can do something like this:

var limit = 3;
$('input.single-checkbox').on('change', function(evt) {
   if($(this).siblings(':checked').length >= limit) {
       this.checked = false;
   }
});

See this working demo