Facebook Like: Dynamically setting og:title property with JS [duplicate] - facebook

Question

I use ajax to render a content page with a Facebook Like Button plugin in it.
The problem is that when the user clics Like, Facebook will extract meta info but I don't know how to assign the meta with ajax.
I tried using append to head int FB.init but it seems to not work and the update isn't reflected when users like the page on Facebook
$('head').append("<meta property="og:title" content="The Rock"/>');

Answer 1

The problem is that facebook like will extract meta info but I don't know how to assign the meta with ajax.
I tried use append to head int FB.init but it seems not work.
Of course this does not work, because Facebook’s scraper requests your URLs from your server – and does not care about what the DOM might currently look like in any user’s browser.
You can not add Open Graph meta data client-side.

Answer 2

Actually you can use such script:
/// Append Meta tags
function setMT(metaName, name, value) {
var t = 'meta['+metaName+'='+name+']';
var mt = $(t);
if (mt.length === 0) {
t = '<meta '+metaName+'="'+name+'" />';
mt = $(t).appendTo('head');
}
mt.attr('content', value);
}
and call this function from body:
setMT('property', 'og:title', 'Title for Facebook');
I have similar on the News Site at http://www.livepage.info

Answer 3

be careful with using '.append()'.
According to the JQuery Docs, this method has a move effect (reads from source, copies to destination and removes the source).
A theoretical way is something like this:
headObj = $("head");
keywordObj = $(headObj).find("meta[name='keywords']");
newKeywords = $(keywordObj).attr("content");
newKeywords += myKeywords;
$(keywordObj).attr("content", newKeywords);
Download and install the plugin FireBug for browser FireFox, so you can check the changes at runtime.