Setting mandatory fill-in choice when selected

Question

Dear Team,

I have a choice field with enabling Allow fill-in choice option. This choice field is optional but when they select fill-in choice option, then it should be mandatory to fill something.
is there any work around, please guide me.

]1

Thanks in advance.

Answer 1

@Harshavardhan ,

-------------------------Update----------------------------

If you have multiple choice columns have the same value, we could use id and title to meet your requirement:
134200-specify-value-2.txt

Result for your reference:

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Add a content edit web part both in NewForm.aspx and EditForm.aspx and insert following code in them:

133824-specify-value.txt

Press F12 to find the radio value used in code:

Result for your reference:

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