根据目标更改URL参数附加到链接的方式

Question

My company is serving up PPC landing pages with Unbounce (on a subdomain), which then links back to our website. We're using the following code to append the AdWords gclid variable to outgoing links:

 $(document).ready(function() {var params = window.location.search.replace(/\+/g,'%20'); var button = $('a').each( function(i) {this.href = this.href + params;});});

The issue arises when the Gclid gets appended to a URL that already has a parameter (like our checkout forms). You end up with a URL that looks like this:

domain.com/checkout?EventID=15546?Gclid=jdkI324kd 

I'm wondering if there's a way to change the Glid's ' ? ' to an ' & ' for certain URLs that already have parameters, while keeping the existing functionality of using the '?' for the others.

Thanks!

Edit: Seems like there's some redirection going on, this is how the href looks for the links in question: http://domain.com/lp/clkg/https/domain.com/cart.aspx?EventID=125160?gclid=CPfO1JaOx7oCFQZyQgod5A4AFw

Answer 1

Simply replace it yourself:

$(document).ready(function() {
    var params = window.location.search.replace(/\+/g,'%20'); 
    var button = $('a').each( function(i) {
        if (this.href.indexOf('?') == -1) {
            this.href = this.href + params;
        } else if (params.length) {
            this.href = this.href + '&' + params.substr(1);
        }
    });
});

Edit: and are you aware that you are replacing subsequent spaces with only one single '%20'?