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Re: Dynamically casting a WOComponent
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Re: Dynamically casting a WOComponent


  • Subject: Re: Dynamically casting a WOComponent
  • From: David LeBer <email@hidden>
  • Date: Mon, 29 Sep 2008 19:07:05 -0400


On 29-Sep-08, at 6:53 PM, David Holt wrote:

I display a different page Component for a user depending on what group they belong to. On each page there is a WOSwitchComponent. There are navigation buttons to reset the selection in a WOSwitchComponent.

I am using a pageName string that is dynamically generated by adding the group code to the component name.

I would prefer the action method names to remain constant so that I can use the same ERXNavigationMenu labels no matter what group the user belongs to.

To do this, it would seem that I need to dynamically cast the WOComponent that is returned when the button is clicked. Is there a way to do this? Here is what I have tried and trying to setSelection(String) on a generic WOComponent generates a compiler error (obviously).

As an example setSelection(String) is a method on the Main1 component and a typical action method to move between sections looks like this:

public WOActionResults toSectionA() {
WOComponent nextPage = null;
ERXNavigationManager .manager().navigationStateForSession(session()).setState(new NSArray(new Object[] {
"my page",
"A. Background"
}));
String usergroupcodestring = _currentUser.surveyGroup().codeNumber();
String pageName = "Main"+usergroupcodestring;
String partSelectionString = "Section"+usergroupcodestring;

nextPage = context().page().pageWithName(pageName);
nextPage.setSelection(partSelectionString+"A");
return nextPage;
}



How do I cast nextPage to the Main1 class so that it can set the selection for the switch component? Or is there a way to setSelection() after the nextPage has been returned and the Class is known?

Use KVC, ie:

	nextPage.takeValueForKey(partSelectionString+"A", "selection");

;david

--
David LeBer
Codeferous Software
'co-def-er-ous' adj. Literally 'code-bearing'
site: 	http://codeferous.com
blog: 	http://davidleber.net
profile:	http://www.linkedin.com/in/davidleber
twitter:	http://twitter.com/rebeld
--
Toronto Area Cocoa / WebObjects developers group:
http://tacow.org




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References: 
 >Dynamically casting a WOComponent (From: David Holt <email@hidden>)

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