From 9abd10e7b8a34b9dcd1a6af5ff37f57bd27cf920 Mon Sep 17 00:00:00 2001
From: Misko Hevery
Date: Thu, 15 Jul 2010 13:13:21 -0700
Subject: proper handlig of $element in filters

---
 src/Angular.js         |  4 +++
 src/directives.js      | 18 ++++++++-----
 src/widgets.js         |  3 +--
 test/directivesSpec.js | 72 ++++++++++++++++++++++++++++++++------------------
 4 files changed, 63 insertions(+), 34 deletions(-)

diff --git a/src/Angular.js b/src/Angular.js
index 2b26c88d..07e9096b 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -78,6 +78,10 @@ function extend(dst) {
   return dst;
 }
 
+function inherit(parent, extra) {
+  return extend(new (extend(function(){}, {prototype:parent}))(), extra);
+};
+
 function noop() {}
 function identity($) {return $;}
 function extensionMap(angular, name) {
diff --git a/src/directives.js b/src/directives.js
index bcc427e8..b57e5ecd 100644
--- a/src/directives.js
+++ b/src/directives.js
@@ -26,12 +26,13 @@ angularDirective("ng:bind", function(expression){
   return function(element) {
     var lastValue = noop, lastError = noop;
     this.$onEval(function() {
-      var error,
-          value = this.$tryEval(expression, function(e){
-            error = toJson(e);
-          }),
-          isHtml,
-          isDomElement;
+      var error, value, isHtml, isDomElement,
+          oldElement = this.hasOwnProperty('$element') ? this.$element : undefined;
+      this.$element = element;
+      value = this.$tryEval(expression, function(e){
+        error = toJson(e);
+      });
+      this.$element = oldElement;
       if (lastValue === value && lastError == error) return;
       isHtml = value instanceof HTML,
       isDomElement = isElement(value);
@@ -74,7 +75,9 @@ function compileBindTemplate(template){
       });
     });
     bindTemplateCache[template] = fn = function(element){
-      var parts = [], self = this;
+      var parts = [], self = this,
+         oldElement = this.hasOwnProperty('$element') ? this.$element : undefined;
+      this.$element = element;
       for ( var i = 0; i < bindings.length; i++) {
         var value = bindings[i].call(self, element);
         if (isElement(value))
@@ -83,6 +86,7 @@ function compileBindTemplate(template){
           value = toJson(value, true);
         parts.push(value);
       };
+      this.$element = oldElement;
       return parts.join('');
     };
   }
diff --git a/src/widgets.js b/src/widgets.js
index 0b77dbf4..7bd51c8c 100644
--- a/src/widgets.js
+++ b/src/widgets.js
@@ -83,8 +83,7 @@ function valueAccessor(scope, element) {
       elementError(element, NG_VALIDATION_ERROR, null);
       invalidWidgets.markValid(element);
     } else {
-      var error,
-          validateScope = extend(new (extend(function(){}, {prototype:scope}))(), {$element:element});
+      var error, validateScope = inherit(scope, {$element:element});
       error = required && !value ?
               'Required' :
               (value ? validator(validateScope, value) : null);
diff --git a/test/directivesSpec.js b/test/directivesSpec.js
index a42faa9a..b6ccf764 100644
--- a/test/directivesSpec.js
+++ b/test/directivesSpec.js
@@ -29,35 +29,57 @@ describe("directives", function(){
     expect(scope.a).toEqual(2);
   });
 
-  it('should ng:bind', function() {
-    var scope = compile('<div ng:bind="a"></div>');
-    expect(element.text()).toEqual('');
-    scope.a = 'misko';
-    scope.$eval();
-    expect(element.text()).toEqual('misko');
-  });
+  describe('ng:bind', function(){
+    it('should set text', function() {
+      var scope = compile('<div ng:bind="a"></div>');
+      expect(element.text()).toEqual('');
+      scope.a = 'misko';
+      scope.$eval();
+      expect(element.text()).toEqual('misko');
+    });
 
-  it('should ng:bind html', function() {
-    var scope = compile('<div ng:bind="html|html"></div>');
-    scope.html = '<div>hello</div>';
-    scope.$eval();
-    expect(lowercase(element.html())).toEqual('<div>hello</div>');
-  });
+    it('should set html', function() {
+      var scope = compile('<div ng:bind="html|html"></div>');
+      scope.html = '<div>hello</div>';
+      scope.$eval();
+      expect(lowercase(element.html())).toEqual('<div>hello</div>');
+    });
+
+    it('should set element element', function() {
+      angularFilter.myElement = function() {
+        return jqLite('<a>hello</a>');
+      };
+      var scope = compile('<div ng:bind="0|myElement"></div>');
+      scope.$eval();
+      expect(lowercase(element.html())).toEqual('<a>hello</a>');
+    });
+
+    it('should have $element set to current bind element', function(){
+      angularFilter.myFilter = function(){
+        this.$element.text('HELLO');
+      };
+      var scope = compile('<div>before<div ng:bind="0|myFilter"></div>after</div>');
+      expect(scope.$element.text()).toEqual("beforeHELLOafter");
+    });
 
-  it('should ng:bind element', function() {
-    angularFilter.myElement = function() {
-      return jqLite('<a>hello</a>');
-    };
-    var scope = compile('<div ng:bind="0|myElement"></div>');
-    scope.$eval();
-    expect(lowercase(element.html())).toEqual('<a>hello</a>');
   });
 
-  it('should ng:bind-template', function() {
-    var scope = compile('<div ng:bind-template="Hello {{name}}!"></div>');
-    scope.$set('name', 'Misko');
-    scope.$eval();
-    expect(element.text()).toEqual('Hello Misko!');
+  describe('ng:bind-template', function(){
+    it('should ng:bind-template', function() {
+      var scope = compile('<div ng:bind-template="Hello {{name}}!"></div>');
+      scope.$set('name', 'Misko');
+      scope.$eval();
+      expect(element.text()).toEqual('Hello Misko!');
+    });
+
+    it('should have $element set to current bind element', function(){
+      angularFilter.myFilter = function(){
+        this.$element.text('HELLO');
+      };
+      var scope = compile('<div>before<div ng:bind-template="{{0|myFilter}}"></div>after</div>');
+      expect(scope.$element.text()).toEqual("beforeHELLOafter");
+    });
+
   });
 
   it('should ng:bind-attr', function(){
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