[jboss-user] [JBoss Seam] - Re: Difference between Page and Event scope

[dustismo]

Here is how I would explain it, if I get anything wrong anyone is welcome to correct me.

Event scope is essentially stateless, the bean is created for a single action and destroyed when that action is complete.

Page scope maintains its state until the page is rendered.  So here is an example that might illustrate it better:

you have a bean with a couple of properties:

  | @Scope(PAGE)
  | @Name("demoBean")
  | ....
  | int id;
  | String message = "message not set";
  | 
  | public int getId() ...
  | public void setId(int id) {
  |   this.id = id;
  |   this.message = "ID Is set!";
  | }
  | 
  | public String getMessage()
  | public void setMessage(String message)
  | ....
  | 

Say you set your id as a page param defined in pages.xml.  Then you could successfully access #{demoBean.message} within your page and get the expected result ("ID Is set!").  If you set the scope to event then you would get ("message not set"). 

Hopefully that helps,
Dustin


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