fix($animate): avoid hanging animations if the active CSS transition …

…class is missing

Closes angular#4732
Closes angular#4490

css/angular.css

@@ -9,3 +9,14 @@
 ng\:form {
   display: block;
 }
+
+/* The styles below ensure that the CSS transition will ALWAYS
+ * animate and close. A nasty bug occurs with CSS transitions where
+ * when the active class isn't set, or if the active class doesn't
+ * contain any styles to transition to, then, if ngAnimate is used,
+ * it will appear as if the webpage is broken due to the forever hanging
+ * animations. The clip (!ie) and zoom (ie) CSS properties are used
+ * since they trigger a transition without making the browser
+ * animate anything and they're both highly underused CSS properties */
+.ng-animate { clip:rect(1px, auto, auto, 0); -ms-zoom:1.0001; }
+.ng-animate-active { clip:rect(0, auto, auto, 0); -ms-zoom:1; }

src/ngAnimate/animate.js

@@ -790,16 +790,22 @@ angular.module('ngAnimate', ['ng'])
         if(!data) {
           var transitionDuration = 0, transitionDelay = 0,
               animationDuration = 0, animationDelay = 0,
-              transitionDelayStyle, animationDelayStyle;
+              transitionDelayStyle, animationDelayStyle,
+              transitionDurationStyle,
+              transitionPropertyStyle;
 
           //we want all the styles defined before and after
           forEach(element, function(element) {
             if (element.nodeType == ELEMENT_NODE) {
               var elementStyles = $window.getComputedStyle(element) || {};
 
-              transitionDuration = Math.max(parseMaxTime(elementStyles[transitionProp + durationKey]), transitionDuration);
+              transitionDurationStyle = elementStyles[transitionProp + durationKey];
+
+              transitionDuration = Math.max(parseMaxTime(transitionDurationStyle), transitionDuration);
 
               if(!onlyCheckTransition) {
+                transitionPropertyStyle = elementStyles[transitionProp + propertyKey];
+
                 transitionDelayStyle = elementStyles[transitionProp + delayKey];
 
                 transitionDelay  = Math.max(parseMaxTime(transitionDelayStyle), transitionDelay);
@@ -820,12 +826,14 @@ angular.module('ngAnimate', ['ng'])
           });
           data = {
             total : 0,
+            transitionPropertyStyle: transitionPropertyStyle,
+            transitionDurationStyle: transitionDurationStyle,
             transitionDelayStyle: transitionDelayStyle,
-            transitionDelay : transitionDelay,
-            transitionDuration : transitionDuration,
+            transitionDelay: transitionDelay,
+            transitionDuration: transitionDuration,
             animationDelayStyle: animationDelayStyle,
-            animationDelay : animationDelay,
-            animationDuration : animationDuration
+            animationDelay: animationDelay,
+            animationDuration: animationDuration
           };
           if(cacheKey) {
             lookupCache[cacheKey] = data;
@@ -896,7 +904,7 @@ angular.module('ngAnimate', ['ng'])
             node.style[transitionProp + propertyKey] = 'none';
           }
 
-          var activeClassName = '';
+          var activeClassName = 'ng-animate-active ';
           forEach(className.split(' '), function(klass, i) {
             activeClassName += (i > 0 ? ' ' : '') + klass + '-active';
           });
@@ -910,25 +918,38 @@ angular.module('ngAnimate', ['ng'])
               return;
             }
 
+            var applyFallbackStyle, style = '';
             if(timings.transitionDuration > 0) {
               node.style[transitionProp + propertyKey] = '';
+
+              var propertyStyle = timings.transitionPropertyStyle;
+              if(propertyStyle.indexOf('all') == -1) {
+                applyFallbackStyle = true;
+                var fallbackProperty = $sniffer.msie ? '-ms-zoom' : 'clip';
+                style += prefix + 'transition-property: ' + propertyStyle + ', ' + fallbackProperty + '; ';
+                style += prefix + 'transition-duration: ' + timings.transitionDurationStyle + ', ' + timings.transitionDuration + 's; ';
+              }
             }
 
             if(ii > 0) {
-              var staggerStyle = '';
               if(stagger.transitionDelay > 0 && stagger.transitionDuration === 0) {
-                staggerStyle += prefix + 'transition-delay: ' +
-                                prepareStaggerDelay(timings.transitionDelayStyle, stagger.transitionDelay, ii) + '; ';
+                var delayStyle = timings.transitionDelayStyle;
+                if(applyFallbackStyle) {
+                  delayStyle += ', ' + timings.transitionDelay + 's';
+                }
+
+                style += prefix + 'transition-delay: ' +
+                         prepareStaggerDelay(delayStyle, stagger.transitionDelay, ii) + '; ';
               }
 
               if(stagger.animationDelay > 0 && stagger.animationDuration === 0) {
-                staggerStyle += prefix + 'animation-delay: ' +
-                                prepareStaggerDelay(timings.animationDelayStyle, stagger.animationDelay, ii) + '; ';
+                style += prefix + 'animation-delay: ' +
+                         prepareStaggerDelay(timings.animationDelayStyle, stagger.animationDelay, ii) + '; ';
               }
+            }
 
-              if(staggerStyle.length > 0) {
-                formerStyle = applyStyle(node, staggerStyle);
-              }
+            if(style.length > 0) {
+              formerStyle = applyStyle(node, style);
             }
 
             element.addClass(activeClassName);

test/ngAnimate/animateSpec.js

@@ -784,6 +784,59 @@ describe("ngAnimate", function() {
       });
 
       describe("Transitions", function() {
+        it("should only apply the fallback transition property unless all properties are being animated",
+          inject(function($compile, $rootScope, $animate, $sniffer, $timeout) {
+
+          if (!$sniffer.animations) return;
+
+          ss.addRule('.all.ng-enter',  '-webkit-transition:1s linear all;' +
+                                               'transition:1s linear all');
+
+          ss.addRule('.one.ng-enter',  '-webkit-transition:1s linear color;' +
+                                               'transition:1s linear color');
+
+          var element = $compile('<div></div>')($rootScope);
+          var child = $compile('<div class="all">...</div>')($rootScope);
+          $rootElement.append(element);
+          var body = jqLite($document[0].body);
+          body.append($rootElement);
+
+          $animate.enter(child, element);
+          $rootScope.$digest();
+          $timeout.flush();
+
+          expect(child.attr('style') || '').not.toContain('transition-property');
+          expect(child.hasClass('ng-animate')).toBe(true);
+          expect(child.hasClass('ng-animate-active')).toBe(true);
+
+          browserTrigger(child,'transitionend', { timeStamp: Date.now() + 1000, elapsedTime: 1000 });
+          $timeout.flush();
+
+          expect(child.hasClass('ng-animate')).toBe(false);
+          expect(child.hasClass('ng-animate-active')).toBe(false);
+
+          child.remove();
+
+          var child2 = $compile('<div class="one">...</div>')($rootScope);
+
+          $animate.enter(child2, element);
+          $rootScope.$digest();
+          $timeout.flush();
+
+          //IE removes the -ms- prefix when placed on the style
+          var fallbackProperty = $sniffer.msie ? 'zoom' : 'clip';
+          var regExp = new RegExp("transition-property:\\s+color\\s*,\\s*" + fallbackProperty + "\\s*;");
+          expect(child2.attr('style') || '').toMatch(regExp);
+          expect(child2.hasClass('ng-animate')).toBe(true);
+          expect(child2.hasClass('ng-animate-active')).toBe(true);
+
+          browserTrigger(child2,'transitionend', { timeStamp: Date.now() + 1000, elapsedTime: 1000 });
+          $timeout.flush();
+
+          expect(child2.hasClass('ng-animate')).toBe(false);
+          expect(child2.hasClass('ng-animate-active')).toBe(false);
+        }));
+
         it("should skip transitions if disabled and run when enabled",
           inject(function($animate, $rootScope, $compile, $sniffer, $timeout) {
 
@@ -1013,7 +1066,7 @@ describe("ngAnimate", function() {
           $rootScope.$digest();
           $timeout.flush();
 
-          expect(elements[0].attr('style')).toBeFalsy();
+          expect(elements[0].attr('style')).not.toContain('transition-delay');
           expect(elements[1].attr('style')).toMatch(/transition-delay: 2\.1\d*s,\s*4\.1\d*s/);
           expect(elements[2].attr('style')).toMatch(/transition-delay: 2\.2\d*s,\s*4\.2\d*s/);
           expect(elements[3].attr('style')).toMatch(/transition-delay: 2\.3\d*s,\s*4\.3\d*s/);
@@ -1030,7 +1083,7 @@ describe("ngAnimate", function() {
         ss.addRule('.ani.ng-enter, .ani.ng-leave',
           '-webkit-animation:my_animation 1s 1s, your_animation 1s 2s;' + 
           'animation:my_animation 1s 1s, your_animation 1s 2s;' +
-          '-webkit-transition:1s linear all 0s;' + 
+          '-webkit-transition:1s linear all 1s;' + 
           'transition:1s linear all 1s;');
 
         ss.addRule('.ani.ng-enter-stagger, .ani.ng-leave-stagger',
@@ -1731,6 +1784,7 @@ describe("ngAnimate", function() {
     expect(child.css(propertyKey)).toBe('background-color');
     child.remove();
 
+    child = $compile('<div class="ani">...</div>')($rootScope);
     child.attr('class','trans');
     $animate.enter(child, element);
     $rootScope.$digest();