How to set maxlength of text-area?

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Hi

I want to set the max length of text-area to 10. 

I checked on OJET cookbook but there I am not sure how to limit the length.  I am seeing in cookbook that error will come even if we type more than the required length , but it will allow to type after max-length is reached. I want to restrict the text length to 10 for my oj-text-area.

Please provide me the solution that is required for this functionality.

Please refer "https://service.mcafee.com/pop" where Service Request number should be a 10 digit number.

Thanks,

Himanshu Sethi