Auto-Resizing Textareas for jQuery

jquery.autoResize.js

/**
  * Auto-Resizing Textareas (jQuery v1.7+)
  * Based on: http://phaistonian.pblogs.gr/expanding-textareas-the-easy-and-clean-way.html
  *
  * Usage:
  * // Direct binding
  * $("textarea").autoResize();
  *
  * // Delegated binding
  * $.autoResize("textarea");
  * $(".container").autoResize("textarea");
  *
**/

;(function($) {
  "use strict";

  var events = "oninput" in window ? "input" : "keyup keydown";

  function resize() {
    this.style.height = "auto";
    this.style.height = this.scrollHeight + this.offsetHeight - this.clientHeight + "px";
  }

  function autoResize(element, selector) {
    var $element = $(element);

    if (typeof selector !== "string") {
      selector = null;
      $element = $element
        .filter("textarea")
        .attr("rows", 1)
        .css({
          "resize"    : "none",
          "overflow-y": "hidden"
        })
        .each(resize);
    }

    return $element.on(events, selector, resize);
  }

  $.autoResize = function(selector) {
    return autoResize(document, selector);
  };

  $.fn.autoResize = function(selector) {
    return autoResize(this, selector);
  }

}(jQuery));