up:link:preload

This event is emitted before a link is preloaded.

Listeners may prevent this event to stop the link from being preloaded or change render options for the preload request.

Example

The following would disable preloading on slow 2G connections:

function isSlowConnection() {
  // https://developer.mozilla.org/en-US/docs/Web/API/NetworkInformation
  return navigator.connection && navigator.connection.effectiveType.includes('2g')
}

up.on('up:link:preload', function(event) {
  if (isSlowConnection()) {
    event.preventDefault()
  }
})