Extend form submissions

[adam-clarey]

This extends the form submission process so that after successful submission, you can trigger JS functions with arguments.

In your form submission, this would be triggered as such:

 data.execute = true;

 data.functionName = 'window.location.reload';

 data.arguments = ['arg1', 'arg2'];

 thisHook.pass(data);

This would be the equivalent of running the below on the clientside:

window.location.reload('arg1', 'arg2');