Re: Binding component output to a string

Before anyone responds, here's an update.
I've taken a different approach -- Rather than generate the output  
and bind it to a WOString, I am generating the HTML template and WOD  
on the fly, and overriding the template() method on WOComponent. Now  
I just have to figure out a good caching scheme...

Ian

On Sep 7, 2006, at 10:58 AM, Ian Baxter wrote:

> Hi,
>
> I'm trying to programmatically generate the HTML output for a  
> reusable WOComponent and bind that output to a WOString. I've found  
> a way to do this, however, when an action is invoked from the  
> component who's content was generated (the component contains a  
> form) I get the following exception:
>
> <WorkerThread0> java.lang.NullPointerException
> 	at com.webobjects.appserver._private.WOForm._enterFormInContext 
> (WOForm.java:58)
> 	at com.webobjects.appserver._private.WOForm.invokeAction 
> (WOForm.java:79)
> 	at com.webobjects.appserver.WOComponent.invokeAction 
> (WOComponent.java:945)
> 	at com.webobjects.appserver.WOSession.invokeAction(WOSession.java: 
> 1168)
> 	at com.webobjects.appserver.WOApplication.invokeAction 
> (WOApplication.java:1375)
> 	at  
> com.webobjects.appserver._private.WOComponentRequestHandler._dispatchW 
> ithPreparedPage(WOComponentRequestHandler.java:196)
> 	at  
> com.webobjects.appserver._private.WOComponentRequestHandler._dispatchW 
> ithPreparedSession(WOComponentRequestHandler.java:287)
> 	at  
> com.webobjects.appserver._private.WOComponentRequestHandler._dispatchW 
> ithPreparedApplication(WOComponentRequestHandler.java:322)
> 	at  
> com.webobjects.appserver._private.WOComponentRequestHandler._handleReq 
> uest(WOComponentRequestHandler.java:358)
> 	at  
> com.webobjects.appserver._private.WOComponentRequestHandler.handleRequ 
> est(WOComponentRequestHandler.java:432)
> 	at com.webobjects.appserver.WOApplication.dispatchRequest 
> (WOApplication.java:1306)
> 	at com.webobjects.appserver._private.WOWorkerThread.runOnce 
> (WOWorkerThread.java:173)
> 	at com.webobjects.appserver._private.WOWorkerThread.run 
> (WOWorkerThread.java:254)
> 	at java.lang.Thread.run(Thread.java:613)
>
> Here is the code I'm using to generate the HTML string I'm binding  
> to the WOString in the parent component:
>
> public String generateOutput() { // This is bound to a WOString in  
> the parent component, thus displaying the component "MyComponent".
> 	MyComponent myComponent = (MyComponent)pageWithName("MyComponent");
>
> 	myComponent.takeValueForKey(displayGroup, "displayGroup");
> 	myComponent.takeValueForKey(product, "product");
> 		
> 	WOResponse response = myComponent.generateResponse();
> 		
> 	return response.contentString();
> }
>
> MyComponent contains a form with a few buttons that perform actions  
> on the bound WODisplayGroup.
>
> You're probably wondering why do I need to do this... The short  
> answer is that I'm using a template engine, and I need to give  
> users a way to place the output of components in their templates.
>
> Any help would be much appreciated.
>
> Thanks,
>
> Ian Baxter
> _______________________________________________
> WebObjects-dev mailing list
> [email protected]
> http://www.omnigroup.com/mailman/listinfo/webobjects-dev

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