Any way to lock entry fields?

I've got some exercises where the user needs to input 3 numerical answers on a page.

Each input represents a separate question, and the user must process the answer of each question in sequence for feedback on the question. I need to 'lock' the input field so the answer can't be typed over once it's been submitted.

I tried putting using a show/hide action with a transparent text block over the entry field, however it hides anything that's been entered.

any bright ideas/experiences?

thanks


Roger B

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