Facebook Share Button for Dynamic Url

Use this to have Facebook's api reparse your page

  FB.XFBML.parse();

This worked for me:

<script language="javascript">
    function fbshareCurrentPage()
    {window.open("https://www.facebook.com/sharer/sharer.php?u="+encodeURIComponent(window.location.href)+"&t="+document.title, '', 
    'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=300,width=600');
    return false; }
</script>

Then call the code with a link:

<a href="javascript:fbshareCurrentPage()" target="_blank" alt="Share on Facebook">Facebook</a>

If you want it to be a direct link instead of opening in a window, use this in the function:

window.location.href="https://www.facebook.com/sharer/sharer.php?u="+encodeURIComponent(window.location.href)+"&t="+document.title;

Possible jquery solution:

<a class="fbsharelink" data-shareurl="YOURLINK">Facebook</a>

$('.fbsharelink').click( function() 
{
    var shareurl = $(this).data('shareurl');
    window.open('https://www.facebook.com/sharer/sharer.php?u='+escape(shareurl)+'&t='+document.title, '', 
    'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=300,width=600');
    return false;
});

You can gain the url using

var href = window.location

you can gain the page title using

var title = document.title

No need to use jQuery for those simple tasks.

To make the FB share button dynamic, you will either have to reload or edit the it's data attributes to match the current values. Also after a quick look at the docs for the GB share button, there is no option to set the title just the HREF. Docs can be found here.

So for your example, after you change the url, also run the following code:

jQuery(document).on('ready', function($){
    var url = window.location;  
    $('.fb-share-button').attr('data-href', url);
});

Do not enter anything in the URL 'Delete the existing link (https://developers.facebook.com/docs/plugins/) as well and include the code in your page as you would normally do.

Like or share button would pick up the link of your current page