As far as I know, there's not an easy way to do that once the page has been rendered. What you could do if you really want to have large textboxes is to get the size of your string and then pass that number as a parameter to the JSP, that way your textbox will always be big enough for your string:
Your number could be smaller/bigger than the text length and you can play around with it until you get it right. But I'm pretty sure you can figure that out.
"Sorry, I misunderstood your problem. You're saying you want to resize the textbox as you type the string. That's more complex. The example above only applies when you already have a string coming from the request."
Joined: Mar 17, 2008