如何检查复选框列表中是否至少选中了一个复选框，其名称属性为数组

Question

I have a div and inside that div i have check boxes with name attribute as an array, now i want to heck if at least one check box is checked.

<div id="check_lists">
  <input type="checkbox" name="usernames[]" value="1">

<input type="checkbox" name="usernames[]" value="2">

<input type="checkbox" name="usernames[]" value="3">

<input type="checkbox" name="usernames[]" value="3">

</div>

Answer 1

You can use attribute equals selector with .is() and :checked-selector

if($('input[name="usernames[]"]').is(':checked')){
    //at least one is checked
}

Answer 2

use length to find at least one check box is checked

 if($('#check_lists input[type=checkbox][name="usernames[]"]:checked').length){
      // at least one check box is checked 
      }