jquery - 如何限制选中复选框的数量？

Question

我有以下 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>

实时站点:

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

如何才能让用户只能选择其中 3 个复选框？

Answer 1

使用 change 事件，您可以执行以下操作:

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

See this working demo