storage/index.html

<!DOCTYPE html>
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<html>
<head>
  <meta charset=utf-8 />
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Firebase Storage 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">

  <!-- Firebase -->
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       * TODO(DEVELOPER): Paste the initialization snippet by navigating to:

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</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>Storage Quickstart</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 demo -->
        <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__title mdl-color--light-blue-600 mdl-color-text--white">
            <h2 class="mdl-card__title-text">Upload a file</h2>
          </div>
          <div class="mdl-card__supporting-text mdl-color-text--grey-600" id="messagesDiv">
            <p>Select a file below. When it is uploaded, a link will be displayed to the uploaded file.</p>
            <h6>Choose File</h6>
            <input type="file" id="file" name="file"/>
            <h6>File URL:</h6>
            <span id="linkbox"></span>
          </div>
        </div>
      </div>
    </main>
  </div>
  <script>
    var auth = firebase.auth();
    var storageRef = firebase.storage().ref();

    function handleFileSelect(evt) {
      evt.stopPropagation();
      evt.preventDefault();
      var file = evt.target.files[0];

      var metadata = {
        'contentType': file.type
      };

      // Push to child path.
      // [START oncomplete]
      storageRef.child('images/' + file.name).put(file, metadata).then(function(snapshot) {
        console.log('Uploaded', snapshot.totalBytes, 'bytes.');
        console.log(snapshot.metadata);
        var url = snapshot.metadata.downloadURLs[0];
        console.log('File available at', url);
        // [START_EXCLUDE]
        document.getElementById('linkbox').innerHTML = '<a href="' +  url + '">Click For File</a>';
        // [END_EXCLUDE]
      }).catch(function(error) {
        // [START onfailure]
        console.error('Upload failed:', error);
        // [END onfailure]
      });
      // [END oncomplete]
    }

    window.onload = function() {
      document.getElementById('file').addEventListener('change', handleFileSelect, false);
      document.getElementById('file').disabled = true;

      auth.onAuthStateChanged(function(user) {
        if (user) {
          console.log('Anonymous user signed-in.', user);
          document.getElementById('file').disabled = false;
        } else {
          console.log('There was no anonymous session. Creating a new anonymous user.');
          // Sign the user in anonymously since accessing Storage requires the user to be authorized.
          auth.signInAnonymously();
        }
      });
    }
  </script>
</body>
</html>