FastComments Docs

Here you can edit and run the code snippet from our documentation.

Example Code Snippet "Callbacks Examples"

<script src="https://cdn.fastcomments.com/js/embed-v2.min.js"></script>
<div id="fastcomments-widget"></div>
<script>
    window.FastCommentsUI(document.getElementById('fastcomments-widget'), {
        tenantId: 'demo',
        onInit: function () {
            console.log('Library started to fetch comments!');
        },
        onAuthenticationChange: function (eventName, userObj) {
            console.log('User authenticated!', eventName, userObj);
        },
        onRender: function () {
            console.log('Render event happened!');
        },
        commentCountUpdated: function (newCount) {
            console.log('New comment count:', newCount);
        },
        onReplySuccess: function (comment) {
            console.log('New comment saved!', comment);
        },
        onVoteSuccess: function (comment, voteId, direction, status) {
            console.log('New vote saved!', comment, voteId, direction, status);
        },
        onImageClicked: function (src) {
            console.log('Image clicked!', src);
        },
        onOpenProfile: function (userId) {
            console.log('User tried to open profile', userId);
            // return true; // return true to prevent default behavior (opening fastcomments.com user profile).
        },
        onCommentSubmitStart: function(comment, continueSubmitFn, cancelFn) {
            console.log('Trying to submit comment', comment);
            setTimeout(function() { // emulating async behavior (calling API etc).
                if(confirm('Should submit?')) {
                    continueSubmitFn();
                } else {
                    cancelFn('Some optional error message');
                }
            }, 1000);
        },
        onCommentsRendered: function(comments) {
            // comments is sorted by the default sort on the page which may be Most Relevant (ex: most upvoted, etc), or Newest First
            const topCommentInList = comments[0];
            console.log('First Comment Rendered:', topCommentInList.avatarSrc, topCommentInList.commenterName, topCommentInList.commentHTML);
        }
    });
</script>

Result