title: Combine checkbox values into string before submitting form
body: <p>I am sending a form to an external server I have limited access to. I have a form with many  check-boxes for different products the user is interested in. I need to send these in a single string that lists all the products they checked.</p>
  
  <p>I know I need to use JavaScript to capture the selections and combine them into one variable and then send it through POST to the external server. I'm not very experienced in Javascript to know how exactly.</p>