diff --git a/form.js b/form.js
index ea41527..1ad7848 100644
--- a/form.js
+++ b/form.js
@@ -1,2 +1,12 @@
-
-$('textarea').autoResize();
\ No newline at end of file
+addAutoresize = function() {
+  document.querySelectorAll('[data-autoresize]').forEach(function(element) {
+    element.style.boxSizing = 'border-box';
+    var offset = element.offsetHeight - element.clientHeight;
+    document.addEventListener('input', function(event) {
+      event.target.style.height = 'auto';
+      event.target.style.height = event.target.scrollHeight + offset + 'px';
+    });
+    element.removeAttribute('data-autoresize');
+  });
+}
+addAutoresize();
\ No newline at end of file