$preventDefault - what for?

[ile]

There is this function:

markup.on('element:form', function(template) {
  if (hasListenerFor(template, 'submit')) {
    addListener(template, 'submit', '$preventDefault($event)');
  }
});

https://github.com/derbyjs/derby-parsing/blob/master/lib/markup.js#L24-L28

Can I ask what would be the purpose of this? I'm running into a problem because of this -- I would not want to prevent the default action in all cases.

The case is like this:

A component has a <form> with on-submit="submit($event)" ... I'm passing that to the main app with this.emit(), and the main app catches it or not. If it doesn't catch it, I would like to perform the default action. Here's where I run into trouble -- the event is always prevented altough I would like to perform the default action sometimes.

I could try to find out if there are listeners in the main app (and if there are not, I could do form.submit() manually), but not sure if there is a way to do that. This wouldn't feel as clean though.

(I thought it would be better to ask it here on GitHub because this might be an "issue".)