How do you create a category (or select an existing one) from a field value on a Page Form in MediaWiki? - mediawiki

Question

I created a form to allow users to input data about scientific topics, references and categories in an organized manner. Problem is, I am unable to automatically categorize the page (by either creating a new category or using an existing one) when a user fills the form with the appropriate category information.
Here is the template page from my Mediawiki site:
<noinclude>
{{#template_params:Summary (label=Topic Summary (In point form, as a numbered list. Include references between <ref></ref> tags.))|User_Category}}
</noinclude><includeonly>
{{#template_display:_format=sections}}
[[Category:Summary Article]]
[[Category:{{#arraymap:|,|##||}}]]
</includeonly>
Here's my form code:
<noinclude>
This is the "Summary Article" form.
To create a page with this form, enter the page name below;
if a page with that name already exists, you will be sent to a form to edit that page.
{{#forminput:form=Summary Article}}
</noinclude><includeonly>
<div id="wikiPreview" style="display: none; padding-bottom: 25px; margin-bottom: 25px; border-bottom: 1px solid #AAAAAA;"></div>
=Summary=
{{{section|Summary|level=1}}}
==Category==
{{{field|User_Category|level=2}}}
</includeonly>
I attempted to assign the field value to the category variable User_Category in order to create a category in the page, but was unsuccessful. Any assistance would be greatly appreciated.

Answer 1

First, you should specify the input type of your field, in your case, tokens should be appropriate.
Then tell the field to take values from the category list, you can achieve this with values from namespace attribute.
{{{field|User_Category|input type=tokens|values from namespace=Category}}}
Second, your template has no reference to the field name User_Category. This should be the arraymap data :
{{#arraymap:{{{User_Category}}}||##| [[Category:##]] }}

Answer 2

I eventually found the solution, which is similar to the one above - but does not cause errors. Here's the template:
<noinclude>
{{#template_params:Summary|Categories}}
{{#template_display:_format=sections}}
</noinclude><includeonly>
[[Category:Summary Article]]
{{#arraymap:{{{Categories|}}}|,|x|[[Category:x]]|\s}}
</includeonly>
Here's the form:
<noinclude>
This is the "Summary Article" form.
To create a page with this form, enter the page name below;
if a page with that name already exists, you will be sent to a form to edit that page.
{{#forminput:form=Summary Article}}
</noinclude><includeonly>
<div id="wikiPreview" style="display: none; padding-bottom: 25px; margin-bottom: 25px; border-bottom: 1px solid #AAAAAA;"></div>
{{{for template|Summary Article}}}
==Summary==
{{{section|Summary|mandatory|rows=20}}}
==Category==
{{{field|Categories|input type=tokens|values from namespace=Category}}}
</includeonly>