ml5/demos/07-sentiment-analysis-vanilla-js.html

<!DOCTYPE html>
<html lang="en" class="loading">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Sentiment Analysis</title>
  <link rel="stylesheet" href="css/normalize.css">
  <link rel="stylesheet" href="css/style.css">
  <style>
    .hidden {
      display: none;
    }
    .loading .display-loading {
      display: block;
    }
    .running .display-running {
      display: block;
    }
    #results {
      background-color: white;
      width: 20rem;
      min-height: 6rem;
      display: none;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      font-size: 2rem;
    }
    .running #results {
      display: flex;
    }
  </style>
</head>
<body>
  <h1 class="h1">Sentiment Analysis</h1>
  <h2 id="state"></h2>
  <form id="form" class="hidden display-running">
    <label for="input">Type a sentence:</label>
    <input type="text" id="input" placeholder="Type a sentence">
    <button type="submit">Submit</button>
  </form>
  <div id="results" class="fancy-shadow hidden display-running"></div>
  <script src="https://unpkg.com/ml5@1/dist/ml5.js"></script>
  <script>

    const $form = document.querySelector("#form");
    const $results = document.querySelector("#results");
    const $state = document.querySelector('#state');
    let sentiment, prediction;

    const STATE_LOADING = "loading";
    const STATE_RUNNING = "running";
    const ALL_STATES = [STATE_LOADING, STATE_RUNNING];
    let state = STATE_LOADING;

    const setState = (value) => {
      console.log('setState', value);
      state = value;
      $state.textContent = state;
      document.documentElement.classList.remove(...ALL_STATES);
      document.documentElement.classList.add(state);
    };

    const preload = async () => {
      setState(STATE_LOADING);
      requestAnimationFrame(draw);
      sentiment = ml5.sentiment("MovieReviews");
      await sentiment.ready;
      console.log('model ready');
      setup();
    };

    const setup = async () => {
      console.log('setup');
      $form.addEventListener("submit", handleSubmit);
      // start the app
      setState(STATE_RUNNING);
    };

    const handleSubmit = async (event) => {
      event.preventDefault();
      const sentence = $form.querySelector("#input").value;
      // store the result in a global
      prediction = await sentiment.predict(sentence);
    };
    
    const draw = () => {
      $results.textContent = prediction?.confidence.toFixed(3);
      requestAnimationFrame(draw);
    }

    preload();
  </script>
</body>
</html>