htmx:before:sse:message ~ htmx

The htmx:before:sse:message event fires when an SSE message arrives, before htmx processes it.

When It Fires

When the SSE stream receives a message from the server, before content swapping.

Event Detail

ctx - Request context
message - Message object with data, event, and id properties

Example


htmx.on('htmx:before:sse:message', (evt) => {
  console.log('SSE message:', evt.detail.message.data);
  // Filter or modify message before processing
});

Cancel this event to skip processing this particular message.