Printing a javascript variable in php echo

Question

To clarify:

I have an echo statement as follows:

 $striptitle .= ' - <a onclick="getnewurl();" href="'.SGLink::album($aid). '">'. $namek .'</a></h1>
<a href="https://twitter.com/share" class="twitter-share-button" data-lang="en" data-via="jb_thehot" data-text="Pictures of '. $hashfinal .'" teens>Tweet</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>';

echo $striptitle ;

The onclick does this:

<script type="text/javascript">
function getnewurl()
{
var url = document.URL;
alert( url );
}
</script>

What I need is essentially to add the my anchor tag a data-url="INSERT_VAR_URL_HERE"

Is that possible?

Let me know if this isn't clear enough Thanks!

Edit: to clarify, the alert in the function is only for testing. What I need is to be able to use the variable obtained in the function, in the same $striptitle variable.

My problem is that the url changes with AJAX, and the twitter button's data-url does not get updated. I was hoping to be able to get the new url by getting it everytime it is clicked. If there are other ways to do that, I'm open to suggestions!

Answer 1

Why not pass it as an argument?

$striptitle .= " - <a onclick=\"getnewurl('URL-HERE');\"...>";

Then in your script:

<script>
    function getnewurl(url) {
        alert(url);
    }
</script>

Answer 2

Building on @Kolink's answer one way to not repeat the url in two places you could generate the link as:

<a onclick="getnewurl(this);" href="...">

then your JS could look like:

function getnewurl(link) {
    link.setAttribute('data-url', location.href);
}

EDIT apparently jQuery.data doesn't update the dom properly, but setAttribute does