[bug-13808]IAE: No page attached to this thread

Ignition
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1

I’m attempting to perform navigation during a Barcode Scan Event, where when I scan the barcode the perspective Session Barcode Scanned Event constructs a page url based off of the text of the barcode. From my logging, the url is being constructed properly, but my Gateway logs are declaring an Illegal Argument Exception:

 com.inductiveautomation.perspective.gateway.script.PerspectiveScriptingFunctions.lambda$operateOnPage$18(PerspectiveScriptingFunctions.java:564) at
 com.inductiveautomation.perspective.gateway.script.PerspectiveScriptingFunctions.operateOnSession(PerspectiveScriptingFunctions.java:606) at
 com.inductiveautomation.perspective.gateway.script.PerspectiveScriptingFunctions.operateOnPage(PerspectiveScriptingFunctions.java:547) at
 com.inductiveautomation.perspective.gateway.script.PerspectiveScriptingFunctions.navigate(PerspectiveScriptingFunctions.java:78) at
 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at
 java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at 
java.base/java.lang.reflect.Method.invoke(Unknown Source) java.lang.IllegalArgumentException: java.lang.IllegalArgumentException: No perspective page attached to this thread.

The triggering code from the Perspective Session Barcode Scanned Event:

system.perspective.navigate(page=data.text)

I’ve also tried

system.perspective.navigate(page=data.text,sessionId=session.props.id)

but the IAE remained.

Could this stem from the fact that the “camera” screen is displayed while the script is executing?

If I modify the Session Barcode Scanned Event to write to a session prop, and I move the navigation to a component on a page which is bound to the session prop, and perform the navigation as part of an onChange script, the navigation performs as expected.

2

I’m not completely sure whether this is “supposed” to work, so I filed an internal ticket so we can check it out and verify for sure. I’ll update this thread once that ticket is updated.

3

We’ve added the pageId to the context so you should have everything you need to navigate. You’ll end up calling system.perspective.navigate(page=data.text, pageId=context.pageId). The change will show up in 8.0.2. Thanks again for the feedback.

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