# How Do You Upload and Download Images Processed with CSS Filters and Blend Modes?

# How Do You Upload and Download Images Processed with CSS Filters and Blend Modes? Published on Saturday, April 20, 2019, at 23:30. Filed under JavaScript Examples. By zhangxinxu, from https://www.zhangxinxu.com/wordpress/?p=8598 This article may be republished in full. Persona...

Code: Dispatching a CustomEvent

const event = new CustomEvent('show', {
  detail: { message: payload, sentAt: new Date().toLocaleTimeString() }
});

window.dispatchEvent(event);

Code: Listening for the Event Payload

window.addEventListener('show', (event) => {
  render(event.detail.message, event.detail.sentAt);
});