ss.js

  $("a").on('click', function() {
                if ($(this).text() === "Preview") {
                    $(this).parent().toggleClass("current");
                    checkCurrent();
                }
            });

            function checkCurrent() {
                if ($('div[rel="wikiEditor-ui-view-preview"]').hasClass("current")) {
                    console.log("You are offline and clicked Preview");
                }
            }