JAVASCRIPT

jquery get all checked checkboxes

var values=[];
$('input[name="your-checkbox-name[]"]:checked').each(function () {
  values[values.length] = (this.checked ? $(this).val() : "");
});

select all checkboxes jquery

$('input:checkbox').prop('checked', true);

jquery get all checkbox checked

$('.theClass:checkbox:checked')

select all checkbox jquery

$('#select_all').change(function() {
  var checkboxes = $(this).closest('form').find(':checkbox');
  checkboxes.prop('checked', $(this).is(':checked'));
});

find all checkbox inside div jquery

$('#selectChb').click(function(){ 
     $(':checkbox').prop("checked", true);
});

jquery select all checkboxes

//html 
<input type="checkbox" onclick="CheckAll(this)" id="checkboxAll" title="Select All" />
//jquery
function CheckAll(elem) {
   $('[name="checkbox"]').prop("checked", $(elem).prop('checked'));
 }

select all checkbox jquery

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
  <table>
    <tr>
      <td><input type="checkbox" id="select_all" /></td>
    </tr>
    <tr>
      <td><input type="checkbox" name="select[]" /></td>
    </tr>
    <tr>
      <td><input type="checkbox" name="select[]" /></td>
    </tr>
    <tr>
      <td><input type="checkbox" name="select[]" /></td>
    </tr>
  </table>
</form>