Posting form data to external API

I've added jquery to my site, and I'm trying to override the form submission to post the form to an external api via Ajax but I'm not having any luck. 
I tried adding a listener to the submit but but it didn't trigger.

$('input[type="submit"').on( "click", function() {
  alert("Button triggered");
});

Can anyone help out? Thanks.

I don’t have the answer to your question, but another workaround might be to use the option to save the form to Google Drive and work your magic there.