Need url parameter "read" so it gets embedded into a buy-link

[mac007]

 

Hi, I need a JAVASCRIPT snippet that can "read" a specific url parameter going to a cart, and embeds it into a link and if parameter is not present then use a default value, so say something like this...

This would be url-link: www.shoppingcart.com?source-code=XYZ&date=whatever&name=whatever

So, when one arrives at that page, there is a buy-link, and I need javascript to embed the "source-code" url-parameter into the link like this:

<a href="http://www.shoppingcart.com?add-item=shoes&source-code=XYZ"> Buy! </a>

So, as you see, the "source-code" parameter gets automatically inserted into the buy-link,

I've done this sort of stuff rather easily thru PHP like this:

https://shoppingcart.com?add-item=shoes&source-code=<?php if(isset($_GET['source-code'])) {echo $_GET['source-code'];} else { echo "DEFAULTCODE”;} ?>

But I havent been able to get it working just right in javascript, does anyone have any ideas best way to accomplish this?

Appreciate any help!  :)

 

 

[requinix]

MDN has something useful.

[mac007]

Thanks requinix, I took a look at it and looks like it's what I need... I found this script that uses that - I tried to get the variable to show up, but somehow havent been able to do it - this is what I have, assuming the URL has a "post=xyz" parameter in it. I'm very green with JS, so havent been able to figure out what I'm missing,

Thanks for your help!

<script>
function getUrlParameter(name) {
    name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
    var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
    var results = regex.exec(location.search);
    return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
};
</script>


<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML.getUrlParameter('post'); 
</script>

 

[requinix]

37 minutes ago, mac007 said:

Thanks requinix, I took a look at it and looks like it's what I need...

But apparently you didn't read the second sentence on the page.

[mac007]

Quote

 

Ahh.. I see it's a bit different - gonna try that out tomorrow,

Thanks again!