adminrest/src/new.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8"/>
    <title>New topic</title>
    <script>
      function createTopic(event) {
        event.preventDefault();
        fetch('http://localhost:8090/kafka/v3/clusters')
          .then(response => response.json())
          .then(({data}) =>
            fetch(data[0].metadata.self + '/topics', {
              method: 'post',
              body: JSON.stringify({
                topic_name: document.getElementById('topic_name').value,
                partitions_count: document.getElementById('partitions_count').value,
                replication_factor: document.getElementById('replication_factor').value
              }),
              headers: {'Content-Type': 'application/json'}
            })
          )
          .then(_ => {
            window.location.href = './index.html';
          })
          .catch(error => console.warn(error));
      }
    </script>
  </head>
  <body>
    <form>
      <label for="topic_name">Topic name:</label><br />
      <input type="text" id="topic_name" name="topic_name" /><br />
      <label for="partitions_count">Partitions count:</label><br />
      <input type="text" id="partitions_count" name="partitions_count" /><br />
      <label for="replication_factor">Replication factor:</label><br />
      <input type="text" id="replication_factor" name="replication_factor" /><br />
      <br />
      <button onclick="createTopic(event)">Create topic</button>
    </form>
  </body>
</html>