In order to use dependent fields you must have Power Scripts for Jira app installed and enabled.
To use the screen values for a field in the data source, you have to add it as a dependent field.
Example: Let's say we have two custom fields: one PCF - Single Autocomplete and one PCF - Multiple Autocomplete, the second one is populated depending on the value of the first one.
An easy example would be: the first custom field has five options, representing the five continents and the second one contains the countries from some table ("countries"), depending on the value selected on the first one.
You can see the corresponding data sources below:
The data source for the first custom field:
return {"AFRICA", "ASIA", "EUROPE", "AMERICA", "OCEANIA"};
The data source for the second custom field:
string x = argv["customfield_10101"];
string[] res = sql("myDB", "select country from countries where continent like '" + x + "'");
return res;
In the issue view screen, the result will look like this:
A similar example can be found here.
For the moment, dependent fields can only be used by the two custom fields with autocomplete, and can only be referred in SIL data sources.
From Power Custom Fields PRO 4.0.0, you can now use the dependent fields on SQL data sources as well.
In order to get the value set on the screen for one custom field, you will have to refer it like this: "argv[customfield_id]"