How to add a variable to a href tag as a parameter?

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I have a page which has 6 identical links that depends on referralTokenValue to track clicks from site A to B.

The link uses the following link structure:

<a href="https://example.com/program?referralToken=123456789">Get Started</a>

Because of the number of link in the page, I'm looking for simple Javascript, without any dependencies on external CDN library(ies), where I can add the referralToken value to the Href tag, like so:

var referralTokenValue = 123456789

<a href="https://example.com/program?referralToken=referralTokenValue">Get Started</a>

The expected result would yield the following embedded link:

https://example.com/program?referralToken=12345789

How can add the referralTokenValue to the link without the use of the ID attribute?

What I have tried:

Quote:
I also have a running prototype at: JSFiddle - Code Playground[^]

However, I can't use this prototype because it uses ID as an attribute in the link, and it would cause an issue with 6 identical links.

Posted 3-Sep-21 5:52am

UXDirector

Updated 3-Sep-21 6:17am

v2

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Richard Deeming · Answer 1 · 2021-09-03T06:17:00

Drop the referral token from the links. Add some means of identifying the links from Javascript.

Eg:

HTML

<a href="http://example.com/program" class="-js-referral-link">Get Started</a>

Then use querySelectorAll to find the links and update them:

JavaScript

const referralTokenValue = 123456789;
const referralLinks = document.querySelectorAll("a.-js-referral-link");
for (let a of referralLinks){
    const url = new URL(a.href);
    url.searchParams.set("referralToken", referralTokenValue);
    a.href = url.toString();
}

Demo[^]