[development] Creating multiple login blocks with, different validation rules.

Anth malkouna at yahoo.com.au
Sat May 15 00:38:54 UTC 2010

Hi Nancy,

OK, I'll do that :)  I haven't written a handbook entry before, but 
having a look is the best spot for it would under 
http://drupal.org/node/561062 do you think?


On 6:59 AM, nan wich wrote:
> Great, Anthony. I suggest that you write up a little snippet page for 
> the Handbooks so it can be found with a search.
> BTW, remember the array_unshift technique, because you will need it 
> again, especially if you do any node_form alters. I worked that same 
> one out some time ago and am amazed at how many times I have to get 
> my submit handlers to fire first. I just had to do it again a couple 
> of days ago on the comment_form. So documenting this in the 
> handbooks could save people a lot of time in the future.
> /*Nancy E. Wichmann, PMP*/
> Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. 
> King, Jr.
> ------------------------------------------------------------------------
> *From:* Anth <malkouna at yahoo.com.au>
> *To:* development at drupal.org
> *Sent:* Fri, May 14, 2010 2:02:50 AM
> *Subject:* Re: [development] Creating multiple login blocks with, 
> different validation rules.
> Hi,
> Thanks for the tips everyone. Worked it out, will describe what I 
> ended up doing in case it's useful to anyone.
> Nancy and Earnie, I was using MultiBlock and the core of the problem 
> for me was that they *don't* change the $form_id so there is nothing 
> to differentiate them. Alex, yep, I'd started to look at hook_forms so 
> your tip was a good kick in the right direction. Lee, by the time I 
> got your email I'd worked it out :)
> So as an example, I had to throw away MultiBlock and generate the 
> blocks on my own but it was pretty easy to do. My application is a 
> timesheet application and there is a role called 'candidate' that 
> needed a separate login. The only real problems I had after getting 
> the hang of all that is for some reason I had to shift my validation 
> function into the first slot (see comments in hook_form_alter) to get 
> it to fire, and if I do a form_set_error(), because the elements are 
> the same name the red error border appears on both, but hey I can live 
> with that.
> in my hook_block:
> case 'view':
> $block['subject'] = 'Candidate Login';
> $block['content'] = drupal_get_form('candidate_login_block');
> return $block;
> Now because 'candidate_login_block' doesn't exist as a function that 
> can be called by drupal_get_form I want drupal_get_form to be called 
> as drupal_get_form('user_login_block') and to make this happen I set 
> up a hook_forms (note, not hook_form) as below:
> function timesheet_forms($form_id, $args) {
> $forms['candidate_login_block']['callback'] = 'user_login_block';
> return $forms;
> }
> This all means that in my hook_form_alter I can do:
> switch($form_id) {
> case 'candidate_login_block':
> // $form['#validate'][] = '_timesheet_candidate_login_validate';
> // The line above doesn't seem to result in my validation function 
> getting called so had to use the form below.
> array_unshift($form['#validate'], '_timesheet_candidate_login_validate');
> break;
> In my function _timesheet_candidate_login_validate I can do whatever I 
> want to invalidate the form (I called user_load with the entered field 
> and checked its roles). Done.
> Thanks,
> Anthony.
> On 14/05/2010 3:37 PM, Lee Rowlands wrote:
> >
> > For a decent Hook_forms example look to ubercart’s uc_product, it 
> uses hook_forms to register the ‘add to cart’ forms : 
> http://api.lullabot.com/uc_product_forms
> >
> > *>* I think the answer about using hook_forms is the way to go, but 
> last I looked the API docs were really bad on that hook.
> >

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