There is a link on a page, and I want to go to it but it just a javascript command. How with mechanize do I go to the link?
<a href="javascript:__doPostBack(ctl54$cphMainContent$resultsGrid$ctl54$ctl25$ctl62$ctl13,88)"><span>abc</span></a>
Without the page and its HTML and JS one can only guess. Note that the follow_link() methods don't work with JS links. The method below does, but of course I cannot test without the page.
Probably the best bet is to get link(s) as DOM object(s) for the click method
use WWW::Mechanize::Firefox;
# Get to your page with the link(s)
my $link = find_link_dom( text_regex => 'abc' ); # Or use find_all_links_dom()
$link->click();
# $mech->click( { dom => $link } ) # works as well
There are also text and text_contains relevant options (instead of text_regex), along with a number of others. Note that click method will wait, on a list of events, before returning. See for example this recent post. This is critical for pages that take longer to complete.
See docs for find_link_dom() and click methods. They aren't very detailed or rich in examples but do provide enough to play with and figure it out.
If you need to interrogate links use find_all_links_dom(), which returns an array or a reference to array (depending on context) of Firefox's DOM as MozRepl::RemoteObject instances.
my @links_dom = find_all_links_dom( text_contains => 'abc' );
# Example from docs for find_link_dom()
for my $ln (@links_dom) {
print $ln->{innerHTML} . "\n"
}
See the page for MozRepl::RemoteObject to see what you can do with it. If you only need to find out which link to click the options for find_link_dom() should be sifficient.
This has been tested only with a toy page, that uses __doPostBack link, with <span> in the link.