Question

I have a html-form with checkboxes.
It is required that has been checked by at least one any checkbox.
How do I use JavaScript to get the values ​​of all checkboxes, and if there is not one checked among checkboxes then show alert with message?

Answer 1

Since you have tagged this post with jquery here is a jQuery option.

This function selects all the checkboxes on the page, narrows it down to only the checked ones, then get’s the size of the jQuery object.

if ($('input:checkbox').prop('checked').size() == 0)
{
alert('no checkboxes were checked');
}

Hope that helps. 🙂