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java.lang.Object org.apache.click.util.FlashAttribute
public class FlashAttribute
Provides a flash session attribute. The flash attribute simply wraps an existing session attribute providing a marker to the Context and SessionMap classes that the session attribute should be removed once it has been accessed.
Flash session attributes appear only once in a session, after they have been accessed they are removed from the session. Flash attributes are typically used for display information messages to a user, and can be used with page redirects. Note you generally do not use FlashAttribute directly, but indirectly via the Context setFlashAttribute() method. For example:public boolean onOkClick() { // Perform logic .. String message = "Operation successfully completed"; getContext().setFlashAttribute("message", message); setRedirect(HomePage.class); return false; }To test for the existence of a flash attribute and then render it, you should set it as a variable in your template, because once it has been accessed from the session it is removed. Using Velocity as an example:
#set ($message = $session.message) #if ($message) <p>$message</p> #end
Context
,
SessionMap
,
Serialized FormField Summary | |
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protected Object |
value
The session attribute value. |
Constructor Summary | |
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FlashAttribute(Object value)
Create a session flash attribute with the given value. |
Method Summary | |
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Object |
getValue()
Return the flash session attribute value. |
String |
toString()
Return the string representation of the flash attribute. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected Object value
Constructor Detail |
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public FlashAttribute(Object value)
value
- the flash session attribute valueMethod Detail |
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public Object getValue()
public String toString()
toString
in class Object
Object.toString()
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