Using jQuery to check if a link is internal or external

Question

I want to write a script which can determine whether a link is internal or external. This is simple from my perspective, all internal links are relative, so they start with

Answer 1

$(document).ready( function() {
$('a[href^="http"]').not('a[href^="http://' + $(location).attr('hostname') + 
'"]').attr('target', '_blank');
});

Replace "http" with "https" if you need to