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    addEventListener

    Last updated: 2023-03-08 11:26:27
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      This API is used to register an event listener for a target. The event listener triggers an edge function when the specified type of event is delivered to the target. Only one event listener takes effect for the same type of event. Only fetch request events are supported currently. If a fetch event occurs after a fetch event listener is registered, the event listener generates a FetchEvent object to process the HTTP request.

      Overview

      function addEventListener(type: string, listener: (event: FetchEvent) => void): void;

      Parameters

      Parameter
      Type
      Required
      Description
      type
      string
      Yes
      Event type.
      Only fetch request events are supported.
      If you specify a request event type other than fetch, the Edge Functions engine throws an Error exception.
      listener
      (event: FetchEvent) => void
      Yes
      Event listener that is used to process event callbacks.
      You can register a fetch event listener to generate FetchEvent objects.

      Sample Code

      // Register a fetch event listener.
      addEventListener('fetch', (event) => {
        // Respond to the client.
        event.respondWith(new Response('Hello World!'));
      });

      References

      MDN documentation: addEventListener
      Sample Functions: Returning an HTML Page
      Sample Functions: Returning a JSON Object
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