Which do you think is the better approach for client-side form
validation when the form has a set of radio buttons to select an option,
and one of the options is "other", and there is also a text box to
specify the "other"?

Option 1:

If the user types in the text box, the "other" radio button is
automatically selected. If the user selects a radio button that's not
"other", the "other" text box is cleared. Javascript is used as a backup
check before submitting the form.


Option 2:

Javascript is used to check the status of the answers before submitting
the form - the user is asked to correct his/her response if the form is
not completed correctly (e.g., there's text in the "other" text box, but
a non-other option is selected)

Other approaches?

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