/**
  * This JavaScript file removes any numbers from the author name field in comment
  * forms. It listens for when users finish typing in the author field and
  * automatically strips out any numerical digits, helping prevent user enumeration
  * through comments.
  *
  * This code is from the 'Stop User Enumeration' plugin.
  * https://wordpress.org/plugins/stop-user-enumeration/
  */
document.addEventListener('DOMContentLoaded', function () {
    var commentForm = document.getElementById("commentform");
    if (null === commentForm) {
        return;
    }

    var author = commentForm.querySelector("#author");
    if (null === author) {
        return;
    }

    author.addEventListener(
        'blur',
        function () {
            this.value = this.value.replace(/\d+/g, '');
        },
        false
    );
});