Small and medium business | Business Central, N...

User should only be allowed to upload PNG files to picture field

(1) Share

Report

Posted on by Maddin

Hello guys,

how can I force the user to only upload images in the BLOB field if it is a PNG file?

Do you have an idea how I can achieve this?

Thank you.

I have the same question (0)

All responses (4)

Answers (0)

Suggested answer

Inge M. Bruvik 1,161 Moderator on at

Like (0)

Report
Copy link

Link copied!

I guess the easiest way will be do a check on the filename that the user is trying to upload.

But the actual code will depend on what table / page you are working on.

Was this reply helpful? Yes No
Maddin 30 on at

Like (0)

Report
Copy link

Link copied!

Ok, the table is 156 and the page 76. Where should I test this?

Was this reply helpful? Yes No
Suggested answer

YUN ZHU 98,421 Super User 2026 Season 1 on at

Like (1)

Report
Copy link

Link copied!

Hi, I think what Inge means is that when you upload a file, judge whether it is a PNG from the File Name, and if it is not, an error will be prompted.
Of course this requires customization, not a standard feature.

For example,

Hope this helps.

Thanks.

ZHU

Was this reply helpful? Yes No
Maddin 30 on at

Like (0)

Report
Copy link

Link copied!

Hello,

thank you very much for your help.

Meanwhile I have created some code, that ensures that the user can only upload images of type PNG. But the problem here is that I use the data type Blob as field and if you click on the field in the page to upload an image, the default logic comes here. As soon as one apparently deposits a field of the type Blob and of the subtype Bitmap, standard functions are always run through. Only after I have then uploaded an image via the standard, next comes my window with the upload only for PNG images. Can I switch off the standard logic somehow? My logic is always later...my code is passed through, in the OnValidate trigger of the new field "Image".

Was this reply helpful? Yes No