Set readonly in input field

I have a text input field (called "buyAmount") in a form. When the Submit button is clicked, I want to set the field to readonly, so that the user will not be able to change anything. This is how I do it in Javascript:

var ba = document.getElementById("buyAmount");
ba.readonly = true;

Somehow the readonly is not working. The user can still change the value. I can't do a "ba.disabled = true" as it will prevent the value from being sent.

Any ideas? Thanks.
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The readonly property should do the trick. Are you sure you got the right element?

Hi yongsing,
I am not sure if I understood you correctly.

You said you want to make the field readonly when the form is submitted.
Thus, the user will be able to anyways change any value in it before the form is submitted
You should make the field readonly when the form is loaded (while defiing the field) so that the user cannot edit it


Note the capitalization: it is "readOnly", not "readonly".

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<input name=buyAmountvalue=somevaluefromDB readonly>
sori for the previous post try this one
<input name=buyAmount value=somevaluefromDB readonly>
This should work:

ba.readOnly = true;
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