remote-config/index.html

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<html>
<head>
  <meta charset=utf-8 />
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Firebase Remote Config Example</title>

  <!-- Material Design Theming -->
  <link rel="stylesheet" href="https://code.getmdl.io/1.1.3/material.orange-indigo.min.css">
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
  <script defer src="https://code.getmdl.io/1.1.3/material.min.js"></script>

  <link rel="stylesheet" href="main.css">
</head>
<body>
<div class="demo-layout mdl-layout mdl-js-layout mdl-layout--fixed-header">

  <!-- Header section containing title -->
  <header class="mdl-layout__header mdl-color-text--white mdl-color--light-blue-700">
    <div class="mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-grid">
      <div class="mdl-layout__header-row mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--8-col-desktop">
        <h3>Firebase Remote Config</h3>
      </div>
    </div>
  </header>

  <main class="mdl-layout__content mdl-color--grey-100">
    <div class="mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-grid">

      <!-- Container for the Table of content -->
      <div class="mdl-card mdl-shadow--2dp mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--12-col-desktop">
        <div class="mdl-card__supporting-text mdl-color-text--grey-600">
          <!-- div to display button to fetch latest config -->
          <div id="fetch_div">
            <h4>Welcome Message:</h4>
            <p id="welcome_message">loading...</p>
            <button class="mdl-button mdl-js-button mdl-button--raised mdl-button--colored"
                    onclick="fetchConfig()">Fetch Remote Welcome</button>
          </div>
        </div>
      </div>

    </div>
  </main>
</div>

<!-- Import and configure the Firebase SDK -->
<!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
<!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
<script src="/__/firebase/9.8.3/firebase-app-compat.js"></script>
<script src="/__/firebase/9.8.3/firebase-remote-config.js"></script>
<script src="/__/firebase/init.js"></script>
<script>
  const remoteConfig = firebase.remoteConfig();

  remoteConfig.settings = {
    minimumFetchIntervalMillis: 3600000,
  };

  remoteConfig.defaultConfig = ({
    'welcome_message': 'Welcome',
  });

  remoteConfig.ensureInitialized()
  .then(() => {
    console.log('Firebase Remote Config is initialized');
    showWelcomeMessage();
  })
  .catch((err) => {
    console.error('Firebase Remote Config failed to initialize', err);
  });

  function showWelcomeMessage() {
    // If you are only interested in the value then you can get it
    // directly using one of the typed getters:
    //
    // const msg = remoteConfig.getString('welcome_message');

    // To get the value and source of the parameter use `getValue`.
    const val = remoteConfig.getValue('welcome_message');

    const welcome_element = document.getElementById('welcome_message');
    welcome_element.innerText = val._value + ' (' + val._source + ')';
  }

  function fetchConfig() {
    const welcome_element = document.getElementById('welcome_message');
    welcome_element.innerText = 'loading...';
    remoteConfig.fetchAndActivate()
      .then(() => {
        showWelcomeMessage();
      })
      .catch((err) => {
        console.error(err);
      });
  }
</script>
</body>
</html>