Creating extra rows in TextArea when input has reached the end of the field?

When typing in a new faceb开发者_如何学JAVAook comments box the height of the textbox changes according to how many lines the box has. What would be the best way to implement this?

Try elastic http://unwrongest.com/projects/elastic/

Perhaps this will help: https://github.com/jaz303/jquery-grab-bag/blob/master/javascripts/jquery.autogrow-textarea.js

The hight of comment box is standard one. You can only define the width of the comment box. Height will be automatically adjusted.

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