Fields definition

Custom fields could be defined easily by standard Joomla! XML form definition file. To define fields for specific component, first you need to find out its context, than create definition files, and store it within your template folder struxture.

Finally modify your template to use such fields in any way you want.


First of all you need to find context of the specific form, you would like to extend by custom fields. In most cases this is name of component, followed by name of view.

Example could be com_content.article, com_modules.module, com_menus.item etc.

Some extensions could use different contexts, if so you have to find the context from the code of the extension, or ask the developer of such extension.

For com_categories, there is exclusion for this rule. To make definition for categroies specific for every extension, the context is always com_extension.category, so for example com_content.category.

Files structure

If you know the context, you are ready to create your fields definition file.

In your template folder create subfolder named n3tfields. Now create subfolder with name before first dot in context. If context contains more than 1 dot, create as many subfolders, as are contained in context.

The last part of context, after the last dot, specifies name of xml file, containing fields definition.

So for example, for context com_content.article, you should create file named article.xml and place it to folder n3tfields/com_content within your template folder.

Example of complex file structure could look like this:


Some contexts supports contexs extensions. For example com_modules.module context supports specific files per module type. In such case form module mod_custom could file structure look like this:


In this case all fields defined in module.xml will be available for all modules, and fields in module/mod_custom.xml will be available just for mod_custom.

Note that fields defined in module/mod_custom.xml still have context com_modules.module, so you can access it same way as any other field defined directly in module.xml, they have just separated definition.

Files content

XML definition files has to be standard Joomla! XML form definiftion files. Take a look in Joomla! documentation to find more. Also list of Standard Joomla! fields could be useful.

To make things easier, n3t Fields also integrates Joomla! fields plugins, so if you install custom fields plugin, you could use it directly in your file, without need to add addfieldspath syntax.

Fields itself has to be named n3tfields. Fieldsets could be generally named however you want, but not all components (com_banners for example) supports all fieldsets. In such case, you have to use some fieldset name supported by component view.

Example of simple fields definition for articles could be:

<?xml version="1.0" encoding="utf-8"?>
    <fields name="n3tfields">
        <fieldset name="myparams" label="My extra fields">
      <field name="my_field" type="text" label="My field" />

If you save this file as n3tfields\com_content\article.xml, your article definition page will be extended by tab named 'My extra fields', with one text field named 'My field'.

Note that for labels, descriptions or any other translatable content in definition files you could use language constants placed directly in your template language file. These should be place in language subfolder of your template and are loaded automatically by n3t Fields.

Multiple templates

Fields definition is shared between templates. In administration, all templates are being serached for fields definition, ordered alphabetically by template name. So, if two fields with same name are defined in two different templates, later definition will be used (that in template, whis is alphabetically ordered as later).

This could be usefull, if you plan to share fields values between templates (for example Article subtitle). There is small pitfall, if you are not carefull with name of fields, it could happen, that different field type is loaded than you expected.