how to check all checkbox in jquery code example

Example 1: jquery get all checkbox checked

$('.theClass:checkbox:checked')

Example 2: select all checkboxes jquery

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

Example 3: select all checkbox jquery

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