How to retrieve checkboxes values in jQuery

How to use jQuery to get the checked checkboxes values, and put it into a textarea immediately? Just like this code:

Here's one that works.

function updateTextArea() { var allVals = []; $('#divId :checked').each(function() { allVals.push($(this).val()); }); $('#t').val(allVals); } $(function() { $('#divId input').click(updateTextArea); updateTextArea(); });