Retrieving information from a component and transferring it to a module in Joomla

While working on a Joomla 2.5 module, I am interested in pulling data from a component into the module's configuration file similar to this example:

<field
 name="catid"
 type="category"
 extension="com_content"
 published=""
 label="Category"
 description="A content category"/>

I understand that the provided code snippet in my module XML configuration file can retrieve a list of categories from the com_content component. However, I am unsure about the process behind this functionality within Joomla. Is it possible for me to implement this feature in my custom components as well? If so, how can I achieve it? I have not found any relevant information regarding this topic in the forum, and I would appreciate it if someone could guide me or provide a useful resource link for further learning. :)

phpjoomlajoomla-extensionsjoomla2.5joomla-module

Answer №1

When a component is created along with its numerous models, it's common practice to customize forms for them. This allows Joomla! to handle much of the backend form functionality on your behalf - all that's needed is defining the form structure/content in an XML file.

Naturally, Joomla! cannot anticipate every data type, which is why forms must be adaptable. Hence, Joomla! offers support for custom form field types... these are usually housed within the fields directory located next to the forms directory in your model.

By specifying an extension and type value, you instruct Joomla! to utilize that particular extension's field type. Therefore, for a specific field example, Joomla will search for 

/administrator/components/com_content/models/fields/category.php

To learn more about "Creating a new field type", refer to the tutorial on developing a component.

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