Unable to add to the params after the form has been submitted

[DannySantos]

The before event acts like the beforeSend event in jquery-ujs and rails-ujs, meaning you're unable to modify form fields or the params in the before hook.

We have gotten around this by adding a new event, but we didn't want to break the naming convention so have had to change the hanami-ujs before event to beforeSend.

I'm not sure what this means for this gem, or whether you would want to make an update that would break existing apps, but here's a summary of the changes we made:

document.addEventListener('ajax:before', function (e) {
  data = e.data;
});

document.addEventListener('ajax:beforeSend', function (e) {
  var token = CSRF.token(), xhr = e.detail;
  if (token)
    xhr.setRequestHeader('X-CSRF-Token', token);
});

------------

document.addEventListener('submit', function(event) {
  var form = event.target;

  if (matches.call(form, 'form[data-remote]')) {
    var before = new CustomEvent('ajax:before', {bubbles: true});
    form.dispatchEvent(before);

    var url = form.action;
    var method = (form.method || form.getAttribute('data-method') || 'POST').toUpperCase();
    var data = new FormData(form);

    if (CSRF.param() && CSRF.token()) {
      data[CSRF.param()] = CSRF.token();
    }

    if (LiteAjax.ajax({ url: url, method: method, data: data, target: form })){
      event.preventDefault();
    } else {
      return true;
    }
  }
});

------------

var beforeSend = new CustomEvent('ajax:beforeSend', {detail: xhr, bubbles: true});
target.dispatchEvent(beforeSend);
xhr.send(data);

return xhr;