function createPostElement()

in database/scripts/main.js [85:187]
70 lines of code
4 McCabe index (conditional complexity)

function createPostElement(postId, title, text, author, authorId, authorPic) {
  var uid = firebase.auth().currentUser.uid;

  var html =
      '<div class="post post-' + postId + ' mdl-cell mdl-cell--12-col ' +
                  'mdl-cell--6-col-tablet mdl-cell--4-col-desktop mdl-grid mdl-grid--no-spacing">' +
        '<div class="mdl-card mdl-shadow--2dp">' +
          '<div class="mdl-card__title mdl-color--light-blue-600 mdl-color-text--white">' +
            '<h4 class="mdl-card__title-text"></h4>' +
          '</div>' +
          '<div class="header">' +
            '<div>' +
              '<div class="avatar"></div>' +
              '<div class="username mdl-color-text--black"></div>' +
            '</div>' +
          '</div>' +
          '<span class="star">' +
            '<div class="not-starred material-icons">star_border</div>' +
            '<div class="starred material-icons">star</div>' +
            '<div class="star-count">0</div>' +
          '</span>' +
          '<div class="text"></div>' +
          '<div class="comments-container"></div>' +
          '<form class="add-comment" action="#">' +
            '<div class="mdl-textfield mdl-js-textfield">' +
              '<input class="mdl-textfield__input new-comment" type="text">' +
              '<label class="mdl-textfield__label">Comment...</label>' +
            '</div>' +
          '</form>' +
        '</div>' +
      '</div>';

  // Create the DOM element from the HTML.
  var div = document.createElement('div');
  div.innerHTML = html;
  var postElement = div.firstChild;
  if (componentHandler) {
    componentHandler.upgradeElements(postElement.getElementsByClassName('mdl-textfield')[0]);
  }

  var addCommentForm = postElement.getElementsByClassName('add-comment')[0];
  var commentInput = postElement.getElementsByClassName('new-comment')[0];
  var star = postElement.getElementsByClassName('starred')[0];
  var unStar = postElement.getElementsByClassName('not-starred')[0];

  // Set values.
  postElement.getElementsByClassName('text')[0].innerText = text;
  postElement.getElementsByClassName('mdl-card__title-text')[0].innerText = title;
  postElement.getElementsByClassName('username')[0].innerText = author || 'Anonymous';
  postElement.getElementsByClassName('avatar')[0].style.backgroundImage = 'url("' +
      (authorPic || './silhouette.jpg') + '")';

  // Listen for comments.
  var commentsRef = firebase.database().ref('post-comments/' + postId);
  commentsRef.on('child_added', function(data) {
    addCommentElement(postElement, data.key, data.val().text, data.val().author);
  });

  commentsRef.on('child_changed', function(data) {
    setCommentValues(postElement, data.key, data.val().text, data.val().author);
  });

  commentsRef.on('child_removed', function(data) {
    deleteComment(postElement, data.key);
  });

  // Listen for likes counts.
  var starCountRef = firebase.database().ref('posts/' + postId + '/starCount');
  starCountRef.on('value', function(snapshot) {
    updateStarCount(postElement, snapshot.val());
  });

  // Listen for the starred status.
  var starredStatusRef = firebase.database().ref('posts/' + postId + '/stars/' + uid);
  starredStatusRef.on('value', function(snapshot) {
    updateStarredByCurrentUser(postElement, snapshot.val());
  });

  // Keep track of all Firebase reference on which we are listening.
  listeningFirebaseRefs.push(commentsRef);
  listeningFirebaseRefs.push(starCountRef);
  listeningFirebaseRefs.push(starredStatusRef);

  // Create new comment.
  addCommentForm.onsubmit = function(e) {
    e.preventDefault();
    createNewComment(postId, firebase.auth().currentUser.displayName, uid, commentInput.value);
    commentInput.value = '';
    commentInput.parentElement.MaterialTextfield.boundUpdateClassesHandler();
  };

  // Bind starring action.
  var onStarClicked = function() {
    var globalPostRef = firebase.database().ref('/posts/' + postId);
    var userPostRef = firebase.database().ref('/user-posts/' + authorId + '/' + postId);
    toggleStar(globalPostRef, uid);
    toggleStar(userPostRef, uid);
  };
  unStar.onclick = onStarClicked;
  star.onclick = onStarClicked;

  return postElement;
}