feat($compile): multiple transclusion via slots

Author: petebacondarwin

src/ng/compile.js

@@ -1486,6 +1486,11 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
         });
       };
 
+      var boundSlots = boundTranscludeFn.$$slots = createMap();
+      for (var slotName in transcludeFn.$$slots) {
+        boundSlots[slotName] = createBoundTranscludeFn(scope, transcludeFn.$$slots[slotName], previousBoundTranscludeFn);
+      }
+
       return boundTranscludeFn;
     }
 
@@ -1646,6 +1651,27 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
       };
     }
 
+
+    function compileTemplate(eager, $templateNodes, parentTranscludeFn, terminalPriority, ignoreDirective, previousCompileContext) {
+      var defaultSlot = [];
+      var slots = createMap();
+      forEach($templateNodes, function(node) {
+        var slotName = jqLite(node).attr('ng-transclude-slot');
+        var slot = defaultSlot;
+        if (slotName) {
+          slot = slots[slotName] = (slots[slotName] || []);
+        }
+        slot.push(node);
+      });
+
+      var transcludeFn = compilationGenerator(eager, defaultSlot, parentTranscludeFn, terminalPriority, ignoreDirective, previousCompileContext);
+      forEach(Object.keys(slots), function(slotName) {
+        slots[slotName] = compilationGenerator(eager, slots[slotName], parentTranscludeFn, terminalPriority, ignoreDirective, previousCompileContext);
+      });
+      transcludeFn.$$slots = slots;
+      return transcludeFn;
+    }
+
     /**
      * A function generator that is used to support both eager and lazy compilation
      * linking function.
@@ -1815,7 +1841,7 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
             compileNode = $compileNode[0];
             replaceWith(jqCollection, sliceArgs($template), compileNode);
 
-            childTranscludeFn = compilationGenerator(mightHaveMultipleTransclusionError, $template, transcludeFn, terminalPriority,
+            childTranscludeFn = compileTemplate(mightHaveMultipleTransclusionError, $template, transcludeFn, terminalPriority,
                                         replaceDirective && replaceDirective.name, {
                                           // Don't pass in:
                                           // - controllerDirectives - otherwise we'll create duplicates controllers
@@ -1829,7 +1855,7 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
           } else {
             $template = jqLite(jqLiteClone(compileNode)).contents();
             $compileNode.empty(); // clear contents
-            childTranscludeFn = compilationGenerator(mightHaveMultipleTransclusionError, $template, transcludeFn);
+            childTranscludeFn = compileTemplate(mightHaveMultipleTransclusionError, $template, transcludeFn);
           }
         }
 

src/ng/directive/ngTransclude.js

@@ -65,9 +65,20 @@ var ngTranscludeDirective = ngDirective({
        startingTag($element));
     }
 
-    $transclude(function(clone) {
-      $element.empty();
-      $element.append(clone);
-    });
+    if ($attrs.ngTransclude) {
+      $transclude = $transclude.$$boundTransclude.$$slots[$attrs.ngTransclude];
+      if (!$transclude) return;
+
+      $transclude(undefined, function(clone) {
+        $element.empty();
+        $element.append(clone);
+      });
+    } else {
+
+      $transclude(function(clone) {
+        $element.empty();
+        $element.append(clone);
+      });
+    }
   }
 });

test/ng/compileSpec.js

@@ -7262,6 +7262,104 @@ describe('$compile', function() {
   });
 
 
+  describe('multi-slot transclude', function() {
+    it('should only include elements without `ng-transclude-slot` attribute in default transclusion function', function() {
+      module(function() {
+        directive('trans', function() {
+          return {
+            transclude: true,
+            template: '<div ng-transclude></div>'
+          };
+        });
+      });
+      inject(function($rootScope, $compile) {
+        element = $compile(
+          '<div trans>' +
+            '<span>stuart</span>' +
+            '<span>bob</span>' +
+            '<span ng-transclude-slot="boss">gru</span>' +
+            '<span>kevin</span>' +
+          '</div>')($rootScope);
+        $rootScope.$apply();
+        expect(element.text()).toEqual('stuartbobkevin');
+      });
+    });
+
+    it('should transclude elements to an `ng-transclude` with a matching `ng-transclude-slot`', function() {
+      module(function() {
+        directive('trans', function() {
+          return {
+            transclude: true,
+            template:
+              '<div class="boss" ng-transclude="boss"></div>' +
+              '<div class="minion" ng-transclude="minion"></div>' +
+              '<div class="other" ng-transclude></div>'
+          };
+        });
+      });
+      inject(function($rootScope, $compile) {
+        element = $compile(
+          '<div trans>' +
+            '<span ng-transclude-slot="minion">stuart</span>' +
+            '<span>dorothy</span>' +
+            '<span ng-transclude-slot="boss">gru</span>' +
+            '<span ng-transclude-slot="minion">kevin</span>' +
+          '</div>')($rootScope);
+        $rootScope.$apply();
+        expect(element.children().eq(0).text()).toEqual('gru');
+        expect(element.children().eq(1).text()).toEqual('stuartkevin');
+        expect(element.children().eq(2).text()).toEqual('dorothy');
+      });
+    });
+
+    it('should provide the elements marked with `ng-transclude-slot` as additional transclude functions on the $$slots property', function() {
+      var capturedTranscludeFn;
+      module(function() {
+        directive('trans', function() {
+          return {
+            transclude: true,
+            link: function(scope, element, attrs, controller, transclude) {
+              capturedTranscludeFn = transclude;
+            }
+          };
+        });
+      });
+      inject(function($rootScope, $compile, log) {
+        element = $compile(
+          '<div trans>' +
+          '  <span ng-transclude-slot="minion">stuart</span>' +
+          '  <span ng-transclude-slot="minion">bob</span>' +
+          '  <span>dorothy</span>' +
+          '  <span ng-transclude-slot="boss">gru</span>' +
+          '</div>')($rootScope);
+        $rootScope.$apply();
+
+        var minionTranscludeFn = capturedTranscludeFn.$$boundTransclude.$$slots['minion'];
+        var minions = minionTranscludeFn();
+        expect(minions[0].outerHTML).toEqual('<span ng-transclude-slot="minion" class="ng-scope">stuart</span>');
+        expect(minions[1].outerHTML).toEqual('<span ng-transclude-slot="minion" class="ng-scope">bob</span>');
+
+        var scope = element.scope();
+
+        var minionScope = jqLite(minions[0]).scope();
+        expect(minionScope.$parent).toBe(scope);
+
+        var bossTranscludeFn = capturedTranscludeFn.$$boundTransclude.$$slots['boss'];
+        var boss = bossTranscludeFn();
+        expect(boss[0].outerHTML).toEqual('<span ng-transclude-slot="boss" class="ng-scope">gru</span>');
+
+        var bossScope = jqLite(boss[0]).scope();
+        expect(bossScope.$parent).toBe(scope);
+
+        expect(bossScope).not.toBe(minionScope);
+
+        dealoc(boss);
+        dealoc(minions);
+      });
+    });
+  });
+
+
   describe('img[src] sanitization', function() {
 
     it('should NOT require trusted values for img src', inject(function($rootScope, $compile, $sce) {