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Low code app DOM error: Cannot read properties of undefined (reading ‘IsRequired’) while saving form

Solved223 views4th July 2023DOM low code app
3
Gerwin van der Kamp [DevOps Enabler]970 9th June 2023 2 Comments

When creating/saving an new instance i do get this error:

Cannot read properties of undefined (reading 'IsRequired')

Where can i find more information or logs to pin where it goes wrong?

Marieke Goethals [SLC] [DevOps Enabler] Selected answer as best 4th July 2023
Tiago Rosa [SLC] [DevOps Advocate] commented 12th June 2023

Hi Gerwin, could you open your browser’s DevTools (F12), go to Console, reproduce the steps you followed and paste the full error here? It might help understanding where the problem originates.

Gerwin van der Kamp [DevOps Enabler] commented 13th June 2023

Sure, there are no errors in the console when hitting save only some warnings about websockets that got interrupted while reloading:

The connection to wss://xxx.xxx.xxx.xxx/API/v1/WebSocket.ashx was interrupted while the page was loading. main.158fc601dec4754f.js:1:1285824
WebSocket error:
error { target: WebSocket, isTrusted: true, srcElement: WebSocket, currentTarget: WebSocket, eventPhase: 2, bubbles: false, cancelable: false, returnValue: true, defaultPrevented: false, composed: false, … }
main.158fc601dec4754f.js:1:1285976
WebSocket will try reconnecting after 4000ms. main.158fc601dec4754f.js:1:1287225
dygraph-skyline.js:3:20145
Cookie “AK” does not have a proper “SameSite” attribute value. Soon, cookies without the “SameSite” attribute or with an invalid value will be treated as “Lax”. This means that the cookie will no longer be sent in third-party contexts. If your application depends on this cookie being available in such contexts, please add the “SameSite=None“ attribute to it. To know more about the “SameSite“ attribute, read https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite WebSocket.ashx
WebSocket connected. main.158fc601dec4754f.js:1:1286300
XHRPOST
https://xxx.xxx.xxx.xxx/API/v1/Internal.asmx/GetUserPhoto

1 Answer

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5
Gilles Bara [SLC] [DevOps Enabler]3.94K Posted 14th June 2023 1 Comment

I had a quick glance at the code and this error could occur when working with stateful DOM. More specifically when you have DomStatusSectionDefinitionLinks that are missing some DomStatusFieldDescriptorLinks required for a proper state transition.

You could inspect the DOM definition and look for some missing  FieldDescriptorLinks in the StatusSectionDefinitionLinks.

Nevertheless the web app should be able to handle such unexpected situations instead of displaying such an ugly, meaningless error. This is a valid issue and you can expect a fix for this.

Marieke Goethals [SLC] [DevOps Enabler] Selected answer as best 4th July 2023
Gerwin van der Kamp [DevOps Enabler] commented 14th June 2023

it mioght be that i don;t use all the fields of an section altough they are all optional. Let’s see what happens when i create one by C#

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