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I need a way to have form validation for multiline text fields when submitting a new record. I know characters like % are not legal characters but I need to be able to verify a multiline text field upon clicking the SAVE button.
I am not a developer so I am a bit limited. I tried to use javascript but I can't get it to work and I think if we turn on modern sites that option will not work either.
A little bit of guidance would be helpful.
Only the following field types can be validated with the "Column Validation" feature:
•Single Line of Text
•Choice (single only)
•Number
•Currency
•Date & Time
If you want to validate value of a multiple-lines of text field, you need script to overwrite the PreSaveAction function on list form .
Yes, the modern list view does not support adding script, you need to switch back to the classic list view.
Here is a demo in the following thread about how to validate the multiple-lines of text field on the list form using script:
List Validation Settings - Multi Line formatted Columns Missing from Create Formula
