How to do checkbox count marked when clicking on Submit?

Question

How to implement checkbox count marked when user clicks on Ubmit, when at least two fields were marked in the code below:

<script>
// Limita a quantidade de cliques
$(".limited1<?php echo $i; ?><?php echo $i4; ?>").click(function() {
    var bol = $(".limited1<?php echo $i; ?><?php echo $i4; ?>:checkbox:checked").length >= 1;     
    $(".limited1<?php echo $i; ?><?php echo $i4; ?>:checkbox").not(":checked").attr("disabled",bol);
});
</script>

Answer 1

To check how many checkboxes have been marked on the page you can use the following javascript function:

var array_checked = document.querySelectorAll('input[type="checkbox"]:checked')
var number_of_checked = array_checked.length