let XJobPostID = url.searchParams.get('XJobPostID'); let jobsIframe = document.getElementById('jobsIframe'); let url_string = "https://www.careers-page.com/xablu"; let jobURL = ""; alert(XJobPostID); // If JobPostID doesn't exists if (typeof XJobPostID === "undefined") { XJobPostID = ""; jobURL = url_string; } else { jobURL = url_string+"/job/"+XJobPostID; } console.log(jobURL); document.getElementById('jobsIframe').src = jobURL;