up.radio up:fragment:hungry

DOM event

Before an [up-hungry] element is added to a render pass, a event up:fragment:hungry is emitted on that element.

Preventing hungry elements from being updated

You may prevent the up:fragment:hungry event to exclude an hungry element from the render pass. Use this to define arbitrary conditions for when an hungry element should be updated.

For example, the following would update an hungry element only for render passes that update history:

element.addEventListener('up:fragment:hungry', function(event) {
  if (!event.renderOptions.history) event.preventDefault()
})

You may also define conditions based on the new element that a hungry element would be swapped with. The following would skip an update if the new element has a class .is-empty:

element.addEventListener('up:fragment:hungry', function(event) {
  if (event.newFragment.classList.contains('is-empty')) {
    event.preventDefault()
  }
})