I know how to create a custom form field if I am building a module/component/plugin but how do I build one of the Joomla! custom fields?

I can't find a tutorial and I think I'm probably Googling the wrong thing (disclaimer: other search engines are available... kind of)


I think you might be right there aren't direct official tutorials on this. But in the Joomla! documentation there is a hint.

A developer focused pdf from the creator of custom fields Allon Moritz called DPFields at this time and merged into Joomla! 3.7


And another link on the official Joomla! documentation: https://docs.joomla.org/J3.x:Adding_custom_fields/Implement_into_your_component

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    Also, if you're wanting to implement custom fields in your own component, then there's a tutorial step at docs.joomla.org/J3.x:Developing_an_MVC_Component/… Sep 19 '20 at 21:57
  • Thanks @alexandreelise are you saying that for com_content I should just be adding it to this area: components/com_content/layouts/field/prepare/foo.php because it is a custom custom field it won't be ovewritten by the core.
    – Eoin
    Sep 21 '20 at 9:13
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    @Eoin it would be better to base your code on actual core custom fields and learn from the core custom. The simplest one is text field in JPATH_ROOT/plugins/fields/text learn from that one first then learn from other fields in the plugins fields group Sep 21 '20 at 15:14
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    In the final release of version 3.7 the fields got migrated to plugins.
    – Laoneo
    Sep 28 '20 at 15:16
  • Thanks @Laoneo so then I would simply duplicate a plugin and stat to write my own from there? Is it just the plugin folder I need to duplicate? It seemed like quite a lot more than that.
    – Eoin
    Mar 12 '21 at 13:14

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