Fix issue jondavidjohn#17 - IE11 page hangs on empty input triggering

Makefile

@@ -7,7 +7,7 @@ dist/payform.js: src/payform.coffee
 	$(BIN)coffee -c --no-header -o dist/ src/payform.coffee
 
 dist/payform.min.js: dist/payform.js
-	$(BIN)uglify -s dist/payform.js -o dist/payform.min.js
+	$(BIN)uglifyjs dist/payform.js -o dist/payform.min.js
 
 dist/jquery.payform.js: src/jquery.payform.coffee
 	$(BIN)browserify             \
@@ -17,7 +17,7 @@ dist/jquery.payform.js: src/jquery.payform.coffee
 	  src/jquery.payform.coffee > dist/jquery.payform.js
 
 dist/jquery.payform.min.js: dist/jquery.payform.js
-	$(BIN)uglify -s dist/jquery.payform.js -o dist/jquery.payform.min.js
+	$(BIN)uglifyjs dist/jquery.payform.js -o dist/jquery.payform.min.js
 
 watch: build
 	$(BIN)watch 'make build' src

dist/jquery.payform.js

@@ -246,6 +246,9 @@ var indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i
   };
   reFormatCardNumber = function(e) {
     var cursor;
+    if (e.target.value === "") {
+      return;
+    }
     cursor = _getCaretPos(e.target);
     e.target.value = payform.formatCardNumber(e.target.value);
     if ((cursor != null) && e.type !== 'change') {
@@ -313,6 +316,9 @@ var indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i
   };
   reFormatExpiry = function(e) {
     var cursor;
+    if (e.target.value === "") {
+      return;
+    }
     cursor = _getCaretPos(e.target);
     e.target.value = payform.formatCardExpiry(e.target.value);
     if ((cursor != null) && e.type !== 'change') {
@@ -379,6 +385,9 @@ var indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i
   };
   reFormatCVC = function(e) {
     var cursor;
+    if (e.target.value === "") {
+      return;
+    }
     cursor = _getCaretPos(e.target);
     e.target.value = replaceFullWidthChars(e.target.value).replace(/\D/g, '').slice(0, 4);
     if ((cursor != null) && e.type !== 'change') {

dist/payform.js

@@ -216,6 +216,9 @@
     };
     reFormatCardNumber = function(e) {
       var cursor;
+      if (e.target.value === "") {
+        return;
+      }
       cursor = _getCaretPos(e.target);
       e.target.value = payform.formatCardNumber(e.target.value);
       if ((cursor != null) && e.type !== 'change') {
@@ -283,6 +286,9 @@
     };
     reFormatExpiry = function(e) {
       var cursor;
+      if (e.target.value === "") {
+        return;
+      }
       cursor = _getCaretPos(e.target);
       e.target.value = payform.formatCardExpiry(e.target.value);
       if ((cursor != null) && e.type !== 'change') {
@@ -349,6 +355,9 @@
     };
     reFormatCVC = function(e) {
       var cursor;
+      if (e.target.value === "") {
+        return;
+      }
       cursor = _getCaretPos(e.target);
       e.target.value = replaceFullWidthChars(e.target.value).replace(/\D/g, '').slice(0, 4);
       if ((cursor != null) && e.type !== 'change') {

package.json

@@ -27,12 +27,12 @@
     "watch": "make watch"
   },
   "devDependencies": {
-    "coffee-script": "~1.9.0",
-    "watch": "~0.13.0",
-    "uglify": "~0.1.1",
-    "mocha": "~2.1.0",
     "browserify": "~8.1.3",
+    "bundle-collapser": "~1.1.1",
+    "coffee-script": "~1.9.0",
     "coffeeify": "~1.0.0",
-    "bundle-collapser": "~1.1.1"
+    "mocha": "~2.1.0",
+    "uglify-js": "^3.2.2",
+    "watch": "~0.13.0"
   }
 }

src/payform.coffee

@@ -198,6 +198,7 @@
   # Format Card Number
 
   reFormatCardNumber = (e) ->
+    return if e.target.value is ""
     cursor = _getCaretPos(e.target)
     e.target.value = payform.formatCardNumber(e.target.value)
     if cursor? and e.type isnt 'change'
@@ -258,6 +259,7 @@
   # Format Expiry
 
   reFormatExpiry = (e) ->
+    return if e.target.value is ""
     cursor = _getCaretPos(e.target)
     e.target.value = payform.formatCardExpiry(e.target.value)
     if cursor? and e.type isnt 'change'
@@ -310,6 +312,7 @@
   # Format CVC
 
   reFormatCVC = (e) ->
+    return if e.target.value is ""
     cursor = _getCaretPos(e.target)
     e.target.value = replaceFullWidthChars(e.target.value).replace(/\D/g, '')[0...4]
     if cursor? and e.type isnt 'change'