'OnOpenPage' is not a valid trigger on card page

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Posted on by ERPlatanos

Hello all,

I am following along with Microsoft's Learning Module, "Introduction to the basics of AL programming in Dynamics 365 Business Central" and on the Exercise page. It is simply creating a card page of data types.

Here is the link

I've run into an error following this page exactly.

I'm having trouble finding any solid documentation to understand why this issue is occurring.

Question 2) Are there any better resources to learn AL than Microsoft's documentation? I'm finding their content to be lackluster. I follow these step-by-step guides, only to run into seemingly basic errors.

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YUN ZHU 89,830 Super User 2025 Season 2 on at

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RE: 'OnOpenPage' is not a valid trigger on card page

Hi, just adding some info.

You can use AL Snippets to support your coding.

https://yzhums.com/2844/

Hope this helps.

Thanks.

ZHU

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DAnny3211 11,201 on at

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RE: 'OnOpenPage' is not a valid trigger on card page

noooo...at the end!

DAniele

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DAnny3211 11,201 on at

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RE: 'OnOpenPage' is not a valid trigger on card page

noooo...at the end!

DAniele

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Teddy Herryanto (Th... 14,008 Super User 2025 Season 2 on at

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RE: 'OnOpenPage' is not a valid trigger on card page

OnOpenPage is not part of the action. It is part of the page itself.

Put it after the actions {}, not inside one of the action.

layout

{

}

actions

{

}

trigger OnOpenPage

begin

end;

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ERPlatanos 73 on at

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RE: 'OnOpenPage' is not a valid trigger on card page

Daniele,

The trigger is in the action section after the layout section.

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DAnny3211 11,201 on at

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RE: 'OnOpenPage' is not a valid trigger on card page

hi

I think microsoft's documentation is very good

but you could also look for videos on you tube that can help you

for example triggers in a page should be inserted after the layout

check my answer if it helped you, thanks

DAniele

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