JFORMFIELD-STAR-001

JFormFieldCalendar / JFormFieldList / JFormFieldMedia / …

JFormField* subclasses (text, list, calendar, media, editor…)

Every Joomla 3 form field class name is an alias (or gone). Custom fields extend the old JFormFieldX name and die on native Joomla 6. Core types map 1:1 to namespaced *Field classes.

JFormFieldCalendar / JFormFieldList / JFormFieldMedia / … → Joomla\CMS\Form\Field\*Field

Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class namePatch possible — review itJoomla API

What you will see

  • Class "JFormFieldList" not found
  • Class "JFormFieldCalendar" not found
  • Class "JFormFieldMedia" not found
  • Class "JFormFieldEditor" not found

Symptoms people search

custom form field 500 · JFormFieldList not found

Replace this code

Swap JFormFieldCalendar / JFormFieldList / JFormFieldMedia / … for Joomla\CMS\Form\Field\*Field.

Joomla 3

Remove or stop calling this

class JFormFieldLmsCourse extends JFormFieldList {}

Joomla 4 / 6

Use this instead

use Joomla\CMS\Form\Field\ListField;
class LmsCourseField extends ListField {}

How to fix it

  1. 1Extend the namespaced Field class (ListField, TextField, CalendarField, MediaField, EditorField, UserField, …).
  2. 2Register the field in the form XML with type="lmscourse" and a namespace, or addfieldpath + new class name.
  3. 3JFormFieldUsergroup is gone — use UsergrouplistField.

Also known as

JFormFieldText · JFormFieldTextarea · JFormFieldList · JFormFieldGroupedlist · JFormFieldRadio · JFormFieldCheckbox · JFormFieldCheckboxes · JFormFieldHidden · JFormFieldPassword · JFormFieldEmail · JFormFieldTel · JFormFieldUrl · JFormFieldNumber · JFormFieldInteger · JFormFieldRange · JFormFieldColor · JFormFieldCalendar · JFormFieldEditor · JFormFieldMedia · JFormFieldFile · JFormFieldUser · JFormFieldCategory · JFormFieldAccesslevel · JFormFieldLanguage · JFormFieldMenu · JFormFieldMenuitem · JFormFieldModulePosition · JFormFieldModuleOrder · JFormFieldSql · JFormFieldRules · JFormFieldSpacer · JFormFieldNote · JFormFieldTag · JFormFieldCaptcha · JFormFieldFilelist · JFormFieldFolderlist · JFormFieldImagelist · JFormFieldPlugins · JFormFieldContentlanguage · JFormFieldContenttype · JFormFieldTimezone · JFormFieldHelpsite · JFormFieldComponentlayout · JFormFieldModulelayout · JFormFieldChromeStyle · JFormFieldContentHistory · JFormFieldFrontendlanguage · JFormFieldHeadertag · TextField · ListField · CalendarField · MediaField · EditorField

Scan a ZIP for thisAsk Infyways to fix it

Related issues

Get in touch

Have a project in mind? Let's talk about it.

Tell us what you're building. Whether it's a new site, an online store, a mobile app, or something that needs AI under the hood, we'll get back to you within a business day.

Free consultation
No commitment, no pressure
Reply within 24 hours
Usually much faster

Prefer a direct conversation?

Request a project quote

Tell us about your project

Fill out the quick form and we'll reach out.