[CAUSEWAY-478] Provide conditional choices, defaults and validation between action parameters

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: viewer-wicket-1.2.0, core-1.2.0
• Fix Version/s: viewer-wicket-1.3.0, core-1.3.0
• Component/s: Core, Viewer Wicket
• Assignee: Daniel Keir Haywood
• Reporter: Daniel Keir Haywood
• Created: 24/Jul/13 06:08
• Updated: 26/Feb/14 23:28
• Resolved: 23/Aug/13 17:17

Description

For example, suppose there is an action to specify an address, where we specify the country, the state and the postcode. We want the state to have choices and a default dependent on the country, and we want the postcode to be validated according to the rules of that country.

public Address enterAddress(Country c, State st, @Named("Postcode") String postcode)

{ ... }

Any dependent parameter must supply a param-specific validate [this is a new method prefix]:

public String validate1EnterAddress(Country c, State st, String postcode) { ... }
public String validate2EnterAddress(Country c, State st, String postcode) { ... }

The choices and defaults for State also accept all param types preceding:

public List<State> choices1EnterAddress(Country c) { ... }

public State default1EnterAddress(Country c)

{ ... }

When the user enters a value for the country, this is passed to these methods. If the user tabs directly to the State param without entering the country, then these would return empty lists/value.

If the user enters a value for the country, then corresponding entries for the state and postcode, and then tabs back to the country and enters a different value, then the validateNXxx methods are called (for all N > 0, country being param 0). If the validate methods indicate their current value is invalid, then the values are set to null or to the recomputed default (if a default method is available).

Issue Links

• duplicates: CAUSEWAY-347 Add the possibility to have dependend drop down boxes