NullFieldStrategy (Tapestry API - 5.7.0)

All Known Implementing Classes:

DefaultNullFieldStrategy, ZeroNullFieldStrategy
```
public interface NullFieldStrategy
```
Defines a strategy, used by Field components such as TextField, to handle the case where either the server-side value to be sent (as a string) to the client, or the client-side string passed back up to the server, is null or blank.

See Also:

NullFieldStrategySource

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`replaceFromClient()`	Provides a replacement value for a null or blank string passed from the client to the server as part of a form submission.
`Object`	`replaceToClient()`	Provides a replacement value for null, when converting the server-side object to a client-side string.

- Method Detail
  - replaceToClient
```
Object replaceToClient()
```
    Provides a replacement value for null, when converting the server-side object to a client-side string. The replacement value, if non-null, will be passed to Translator.toClient(Object).
  - replaceFromClient
```
String replaceFromClient()
```
    Provides a replacement value for a null or blank string passed from the client to the server as part of a form submission. This replacement value will be passed to Translator.parseClient(Field, String, String) as if it were the value supplied by the user.
    
    Returns:
    
    replacement value (this must not be null)