Fixed Firefox issue where calling dispatchEvent on a detached element throws an error. Fixes #317.3.0.18

1 files changed, 39 insertions, 16 deletions

diff --git a/src/autosize.js b/src/autosize.js
index 42fb2bc..3625a8e 100644
--- a/src/autosize.js
+++ b/src/autosize.js
@@ -1,15 +1,26 @@
-const set = (typeof Set === "function") ? new Set() : (function () {
-	const list = [];
+const map = (typeof Map === "function") ? new Map() : (function () {
+	const keys = [];
+	const values = [];
 
 	return {
 		has(key) {
-			return Boolean(list.indexOf(key) > -1);
+			return keys.indexOf(key) > -1;
 		},
-		add(key) {
-			list.push(key);
+		get(key) {
+			return values[keys.indexOf(key)];
+		},
+		set(key, value) {
+			if (keys.indexOf(key) === -1) {
+				keys.push(key);
+				values.push(value);
+			}
 		},
 		delete(key) {
-			list.splice(list.indexOf(key), 1);
+			const index = keys.indexOf(key);
+			if (index > -1) {
+				keys.splice(index, 1);
+				values.splice(index, 1);
+			}
 		},
 	}
 })();
@@ -27,7 +38,7 @@ try {
 }
 
 function assign(ta) {
-	if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || set.has(ta)) return;
+	if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || map.has(ta)) return;
 
 	let heightOffset = null;
 	let clientWidth = ta.clientWidth;
@@ -143,7 +154,12 @@ function assign(ta) {
 		if (cachedHeight !== computedHeight) {
 			cachedHeight = computedHeight;
 			const evt = createEvent('autosize:resized');
-			ta.dispatchEvent(evt);
+			try {
+				ta.dispatchEvent(evt);
+			} catch (err) {
+				// Firefox will throw an error on dispatchEvent for a detached element
+				// https://bugzilla.mozilla.org/show_bug.cgi?id=889376
+			}
 		}
 	}
 
@@ -159,11 +175,12 @@ function assign(ta) {
 		ta.removeEventListener('keyup', update, false);
 		ta.removeEventListener('autosize:destroy', destroy, false);
 		ta.removeEventListener('autosize:update', update, false);
-		set.delete(ta);
 
 		Object.keys(style).forEach(key => {
 			ta.style[key] = style[key];
 		});
+
+		map.delete(ta);
 	}.bind(ta, {
 		height: ta.style.height,
 		resize: ta.style.resize,
@@ -184,23 +201,29 @@ function assign(ta) {
 	window.addEventListener('resize', pageResize, false);
 	ta.addEventListener('input', update, false);
 	ta.addEventListener('autosize:update', update, false);
-	set.add(ta);
 	ta.style.overflowX = 'hidden';
 	ta.style.wordWrap = 'break-word';
 
+	map.set(ta, {
+		destroy,
+		update,
+	});
+
 	init();
 }
 
 function destroy(ta) {
-	if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
-	const evt = createEvent('autosize:destroy');
-	ta.dispatchEvent(evt);
+	const methods = map.get(ta);
+	if (methods) {
+		methods.destroy();
+	}
 }
 
 function update(ta) {
-	if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
-	const evt = createEvent('autosize:update');
-	ta.dispatchEvent(evt);
+	const methods = map.get(ta);
+	if (methods) {
+		methods.update();
+	}
 }
 
 let autosize = null;