Im using related tables with the multiselect widget, is there a way to group items for let's say category_id? In other words, is there a way to edit the items displayed? let's say display them as a tree or something similar?
To create a custom field, you could create a type of "custom" in your model's form_fields method, or give the field a "class" parameter that your javascript can use to transform it the field. http://www.getfuelcms.com/user_guide/libraries/form_builder
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To add javascript to a module, you can add a file name to the module's "js" parameter: http://www.getfuelcms.com/user_guide/modules/simple
To create a custom field, you could create a type of "custom" in your model's form_fields method, or give the field a "class" parameter that your javascript can use to transform it the field.
http://www.getfuelcms.com/user_guide/libraries/form_builder