server-sent-events/index.html at main · maxwellzp/server-sent-events · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Server-Sent Events</title>
  </head>
  <body>
    <div id="price-block"></div>
    <form>
      <input id="stop" type="button" value="Stop stream" />
    </form>
    <script>
      const url = "http://127.0.0.1:9000/stream";
      const eventSource = new EventSource(url);
      const priceElem = document.getElementById("price-block");
      const stopBtn = document.getElementById("stop");

      eventSource.onmessage = (message) => {
        priceElem.innerText = `${message.data}`;
      };

      stopBtn.addEventListener("click", () => {
        eventSource.close();
      });
    </script>
  </body>
</html>