resize_textarea_jquery.js

/*    
 * Scale all textareas dynamically on the page
 * Requires JQuery
 */
function scaleTextareas() {
  $('textarea').each(function(i, t){
    var m = 0;
    $($(t).val().split("\n")).each(function(i, s){
      m += (s.length/(t.offsetWidth/10)) + 1;
    });
    t.style.height = Math.floor(m + 2) + 'em';
  });
  setTimeout(scaleTextareas, 1000);
};
$(document).ready(function(){
  scaleTextareas();
});