[Seaside] Error: Components not found

[Avi Bryant]

On Oct 21, 2004, at 7:22 PM, Yoel Jacobsen wrote:

> What's the role of #children whan using a callback?

A component's callbacks are evaluated in the dynamic context of its 
ancestors in the UI tree.  This lets its ancestors "control" those 
callbacks - they can prevent them from executing if the user has not 
been authenticated, for example, or they can catch validation errors 
that occur within them and record these for displaying to the user 
later, or they can set up thread-local variables that will be useful to 
them, and so on.  To achieve this, the component tree is walked 
recursively during callback processing, and the callbacks for each 
component are executed as it is visited.  The #children method controls 
this traversal - it's what's used to know which subcomponents to 
recurse into.  If a component isn't listed in #children, it won't get 
visited, and so its callbacks will never get executed.

Avi