How to eliminate copy and paste using javascript

Kindly, helpe me in this regard,

I have a textarea and should accept only alphanumeric characters upto 500 characters and if we do copy and paste more than 500 characters it should take 500 characters and remaining should eliminate.

kindly, provide me the code how to perform this

"Srinivas", please check your private messages immediately.

with onchange call a function that uses substring if it is greater than 500 characters.

Eric

Still i couldn't able to get rid of that problem?

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