Custom field condition - Expert mode

With this expert option you can create custom field conditions. For example, this function allows a field for online payment and the selection "Yes" to open a new field, while "No" does not open a new field.

View in Frontend:

To do this, first open "Options", then the "Misc." tab and scroll down to "Expert Mode".

To activate the custom field condition, choose "Yes".

Then open "System Tools" and under "General" click on "Custom Fields".

Then select the desired field and "Expert options" will appear next to the "General" tab. There you can then enter the "showon".

The "showon" syntax can be found here: https://docs.joomla.org/Form_field#Showon

"foo / bar" you have to customize yourself:
custom_field_[field_group_id]_[field_id]:[value]

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