Autogrow textarea

autogrow.js

var heightScroll = $("textarea").get(0).scrollHeight; //Receives scroll height
var heightTextarea = $("textarea").height(); //Receives textarea height
var height = heightTextarea;

for(height; heightScroll > heightTextarea; height++) {
    heightTextarea = height; //Textarea height receives the current height
    $("textarea").css("height", height); //Textarea height receives the height value changed
}