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Re: [EP-tech] Enabling/disabling fields in the workflow using JS

Hi Tomasz,


I agree we’ll probably need jQuery when we go through mobile-proofing. I’d expect it to replace Prototype at some point in Eprints development.


I’m still working on it, but for now, I’ve managed to achieve what I need with just a few lines of code. Using querySelectorAll, which returns an array of the matching elements, I can add the onclick event on both radio buttons. Voilà! There’s always another way around! J


Thanks guys!




De : Tomasz Neugebauer [mailto:Tomasz.Neugebauer@concordia.ca]
Envoyé : 2 août 2017 16:19
À : eprints-tech@ecs.soton.ac.uk
Objet : Re: [EP-tech] Enabling/disabling fields in the workflow using JS


Hi Robin,


I think that jQuery is worthwhile to have integrated with EPrints, in part because Bootstrap plugins require it – and let’s face it – EPrints will have to become mobile friendly eventually, and that will most likely mean Bootstrap  - that is how most repositories that have adapted to mobile are dealing with it now.


My experience with trying to pass additional options to render functions in Eprints is that it is very difficult to do without touching the EPrints core in ways that are difficult to maintain when it comes time to upgrading.  The page you found (https://wiki.eprints.org/w/Include_Javascript_in_the_workflow ) seems promising, and it sounds like you are making some progress with it. 


Like Christopher, my intuition would also be to try to use jQuery (https://api.jquery.com/click/ ) to add an event listener to name$='_diplome_articles'.


Best wishes,





From: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] On Behalf Of Robin Sylvestre
Sent: August-02-17 9:41 AM
To: Christopher Gutteridge <cjg@ecs.soton.ac.uk>; eprints-tech@ecs.soton.ac.uk
Subject: Re: [EP-tech] Enabling/disabling fields in the workflow using JS


Hi Christopher,


Thanks for your suggestion. I’m a bit more familiar to jQuery than Prototype, although I think it would be overkill to load jQuery on top of Prototype just for doing this. I’m sure there is an easier way to fix this!


Could I pass another option to render_input_field_actual to add the onclick event to the radio button?





De : Christopher Gutteridge [mailto:cjg@ecs.soton.ac.uk]
Envoyé : 1 août 2017 17:59
À :
eprints-tech@ecs.soton.ac.uk; Robin Sylvestre <robin.sylvestre@polymtl.ca>
Objet : Re: [EP-tech] Enabling/disabling fields in the workflow using JS


If you need jQuery to make life easier;

  <script src="/_javascript_/jquery.min.js" type="text/_javascript_">// <!-- No script --></script>
  <script type="text/_javascript_">$.noConflict();</script>

The second bit is vital or it conflicts with prototype.js which also likes to use the $ variable and is required for EPrints features.

On 01/08/2017 21:51, Robin Sylvestre wrote:

Hello fellow Eprinters!


I’m trying to enable/disable a date field in the workflow based on the value of a radio button (value = True or False), using _javascript_. Is there an easy way to do it?


This page contains some clues and I’ve tried adding a render_input option to my field definition:



  'name' => 'diplome_articles',

  'type' => 'boolean',

  'multiple' => 0,

  'volatile' => 0,

  'input_style' => 'radio',

   'render_input' => sub {

                    my ( $field, $repository, $current_value, $dataset, $staff, $hidden_fields, $object, $basename ) = @_;

                    my $dom = $field->render_input_field_actual( $repository, $current_value, $dataset, $staff, $hidden_fields, $object, $basename );


my $script = $repository->make_javascript('


var buttonOpt = document.getElementById("'.$basename.'");

buttonOpt.addEventListener("click", function(){ alert() });




     my $superdom = $repository->xml->create_element("div");



              return $superdom;




…but since both radio buttons (true/false) get the same ID when rendered by EPrints, using “getElementById” returns only the first element, thus only works when the first option is clicked.


From the console of my browser, I know I can get the value of the selected option using




…but I can’t figure out how to add an event listener for when this value is changing. Actually, the much, much easier way would be to just add _onclick_="function()" to the radio button itself and toggle the date field accordingly. But is it possible to do it without hacking EPrints too much?  


Thanks for your help!!



Robin Sylvestre

Technicien en gestion de l’information numérique

Services techniques et systèmes informatisés

Bibliothèque de l’École Polytechnique de Montréal

514-340-4711 poste 3743



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