Re: newbie: basic question on getting a value from an entity
Re: newbie: basic question on getting a value from an entity
- Subject: Re: newbie: basic question on getting a value from an entity
- From: Chuck Hill <email@hidden>
- Date: Sat, 3 Mar 2007 18:31:49 -0800
Paul,
I think that what you need is a good book on Java. Bruce Eckel's
Thinking in Java is one that I would highly recommend.
On Mar 3, 2007, at 2:42 PM, Paul Marvine wrote:
I am using pagesDisplayGroup.selectedObject() successfully in other
actions of the page.
Also, on the page I have a WOtextField with value =
pagesDisplayGroup.selectedObject.pageTemplate
that shows the data which I am trying to use. So selectedObject()
is not null and the attribute "pageTemplate" has some data in it.
I can display the field on the page, but how do I call the same
data in an action?
String desiredComponent = pagesDisplayGroup.selectedObject
().pageTemplate(); doesn't seem to work.
This is the definition of selectedObject():
public Object selectedObject()
The Object class does not have a method named pageTemplate() and Java
does not guess. You need to tell it what kind of object you are
expecting selectedObject() to return:
String desiredComponent = ((NameOfClassThatImplementsPageTemplate)
pagesDisplayGroup.selectedObject ()).pageTemplate();
Chuck
On 03.03.2007, at 13:36, Paul Marvine wrote:
But the trouble starts when I change the action to this...
public String desiredComponent;
public WOComponent doWebTemplate()
{
String desiredComponent = pagesDisplayGroup.selectedObject
().pageTemplate();
WOComponent nextPage = pageWithName( desiredComponent );
return nextPage;
}
What is the correct way to write the line to get the value of
"pageTemplate"?
I get a can't resolve symbol error, or with other variations
on the line I'll get a Null pointer exception when it runs.
I guess that selectedObject is null. How does the page know, what
the selectedObject should be? How do you set this?
Next guess: you may display a page with a list of objects, where
each of them has a "pageTemplate", somehow you select one of the
objects and it should return the string value - but you have to
assign "selectedObjects" of the displayGroup somehow.
Can you give some more info?
cug
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