Re: [Koha-devel] Disabling multiple submission on search form

[SUZUKI Arthur]

Hi Frederic,
We are not sure but all those requests from same IP with same query in such a 
few seconds gives us some confidence in this scenario.
I just opened a bug ticket: 
https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15855
Attached to it is an extract of koha-opac-access_log for better understanding 
of the issue.
Also tested your code, works great on Chrome, IE11 and Firefox!
Regards,
Arthur

-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Frédéric Demians
Envoyé : jeudi 18 février 2016 09:14
À : SUZUKI Arthur
Cc : address@hidden; address@hidden; CROUZET Olivier; BOUIS Sonia
Objet : Re: [Koha-devel] Disabling multiple submission on search form

> Some impatient users tends to click several times on the “Go” button 
> of the search form on OPAC. Probably in a desperate hope that this 
> will speed up the whole process.

> However the result is quite opposite, as Zebra is then queried 
> multiple times which increases the server cpu load, until it reach 
> 100% and cause Denial of Service (boooh…)

Are you sure your users are doing that? Koha server can lag severely for other 
reasons...

> We had the idea of disabling the “searchsubmit” button upon first click.
> This is done by adding onclick=”this.disabled=true;” after “id=searchsubmit”
> in masthead.inc.

Rather than modifying direcly masthead.inc, you could do it with a JavaScript 
snippet placed in opacuserjs system preference:

$(document).ready(function() {
 $('#searchform').submit(function() {
   $('#searchsubmit').prop('disabled',true).text('searching...');
 });
});

It could make sense to integrate this to Koha code base: open a bug ticket.