Help with adding items to cart in JS

The work space you linked to is incomplete. There are scripts that you are linking to that aren't there, and pages that you are linking to that aren't there, which is making it difficult to debug, since I can't test your code in the browser. Basically your application currently does nothing and will just give missing file and 404 errors.

As for why your cart is only showing the last product, if I were to guess I think it would be these two lines of code here:

// henter bilde og tekst

    document.getElementById("utskrift-cookie-p").innerHTML = `<article  id='product-handlekurv'><img src='${bilde}' alt='${h3}'/><h3>${h3}</h3></article>`;

    //viser hvor mye som ligger i handlekurven
    document.getElementById("antall").innerHTML = "Handlekurv";

It whenever these lines of code are run, it will overwrite itself, so if you had multiple items and this code ran multiple times, the first item would be added, then the second item would overwrite it and so on and so on, until only the last remaining element has overwritten everything else.

Your code comments appear to be in German or Norwegian, which I do not speak unfortunately so I am unsure as to what you are trying to make each method do.

Ok so, who would I write the code so it didnt overwirte, and below is a new workspace with it all.

https://w.trhou.se/3omlgn5d9j Dane Parchment