Grab URL parameters script

gistfile1.txt

// Apply URL parameters to Register Button if present
var changeTarget = document.getElementById('registerBtn'); 
var params = window.location.search;
var _href = changeTarget.href; 

// Does the page have url parameters ?
if (params) {
    // yes - add them to the iframe src
    changeTarget.href = _href+params;
    console.log("url params = " + params);
} else {
    // no - use a generic iframe src
    changeTarget.href = _href;
}

gistfile2.txt

<a href="/en/event-registration" data-type="btn" class="img-container" style="position: relative;" id="registerBtn"><button class="btn white-btn">Register Now</button></a>