Change the height and width of a text area using the cols and rows properties:
Click the button to change the width and height of the text area.
<!DOCTYPE html> <html> <body> <textarea id="myTextarea"> At java2s.com you will learn how to make a website. </textarea> <button type="button" onclick="myFunction()">Test</button> <script> function myFunction() {//from w ww. java2 s . c o m document.getElementById("myTextarea").cols = "100"; document.getElementById("myTextarea").rows = "10"; } </script> </body> </html>