Avoided adjusting the height for hidden textarea elements. Fixes jack…

…moore#155.

changelog.md

@@ -1,5 +1,8 @@
 ## Changelog
 
+##### v.3.0.3 - 2015-04-23
+* Avoided adjusting the height for hidden textarea elements.  Fixes #155.
+
 ##### v.3.0.2 - 2015-04-23
 * Reworked to respect max-height of any unit-type.  Fixes #191.
 

dest/autosize.js

@@ -63,11 +63,18 @@
 			var startHeight = ta.style.height;
 			var htmlTop = document.documentElement.scrollTop;
 			var bodyTop = document.body.scrollTop;
+			var originalHeight = ta.style.height;
 
 			ta.style.height = 'auto';
 
 			var endHeight = ta.scrollHeight + heightOffset;
 
+			if (ta.scrollHeight === 0) {
+				// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
+				ta.style.height = originalHeight;
+				return;
+			}
+
 			ta.style.height = endHeight + 'px';
 
 			// prevents scroll-position jumping

package.json

@@ -1,7 +1,7 @@
 {
   "name": "autosize",
   "description": "Autosize is a small, stand-alone script to automatically adjust textarea height to fit text.",
-  "version": "3.0.2",
+  "version": "3.0.3",
   "keywords": [
     "textarea",
     "form",

src/autosize.js

@@ -43,11 +43,18 @@ function assign(ta) {
 		const startHeight = ta.style.height;
 		const htmlTop = document.documentElement.scrollTop;
 		const bodyTop = document.body.scrollTop;
-
+		const originalHeight = ta.style.height;
+
 		ta.style.height = 'auto';
 
 		let endHeight = ta.scrollHeight+heightOffset;
 
+		if (ta.scrollHeight === 0) {
+			// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
+			ta.style.height = originalHeight;
+			return;
+		}
+
 		ta.style.height = endHeight+'px';
 
 		// prevents scroll-position jumping