Disable text input on a field once it has a value

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Posted on by crawoo

Hi,

I've been scratching my head on this and not getting very far. Sounds simple, but something is missing...

I have a canvas app with a form based on a SharePoint list. One of the fields is a multiline text field. I would like to disable any further text input into this (begins life blank) field once, either 1) the form is saved and the source record now contains data, or 2) once the user has entered their data.

I've tried option 2 using If(IsBlank(DataCardValue7.Value),DisplayMode.Edit, DisplayMode.Disabled) but this disables the field as the user is typing.

I've seen many examples of using DataCardValue7.text but this multiline text field does not have that property.

Maybe option 1 is the best but not quite sure how to get it working.

Any other ideas out there?

Cheers!

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mmbr1606 14,629 Super User 2026 Season 1 on at

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hey @crawoo

you can try this onsuccess of form:

OnSuccess of Form: Set(varDataSaved, true)

and this in the displaymode of textbox:

DisplayMode Property of Text Input: If(varDataSaved && !IsBlank(DataCardValue7.Text), DisplayMode.Disabled, DisplayMode.Edit)

Let me know if my answer helped solving your issue.

If it did please accept as solution and give it a thumbs up so we can help others in the community.

Greetings

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crawoo 10 on at

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Hi @mmbr1606 ,

This is similar to what I have seen suggested. In my post I did say that datacardvalue7.Text is not an option.
datacardvalue7 does have a 'Value' property, which I have tried, but does not disable the field.

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