AngularJS在JSON计数特定节点的数目数据集

Question

我有一组JSON数据：

"MyMessages": [ 
     { 
      "Code" : "N101", 
      "ID" : "History", 
      "Indicator" : "Down", 
      "PosChangeMessage" : "test test test test", 
      "NegReasonMessage" : "test test test test", 
      "Image" : "ImageType.Warning" 
     }, 

     { 
      "Code" : "A874", 
      "ID" : "History", 
      "Indicator" : "Up", 
      "NegReasonMessage" : "test test test test", 
      "Image" : "ImageType.Ok" 
     }, 

     { 
      "Code" : "X85", 
      "ID" : "Age", 
      "Indicator" : "Down", 
      "PosChangeMessage" : "test test test test", 
      "Image" : "ImageType.Warning" 
     }, 

     { 
      "Code" : "Z846", 
      "ID" : "Products", 
      "Indicator" : "Up", 
      "PosChangeMessage" : "test test test test", 
      "Image" : "ImageType.Ok" 
     }, 
    ], 

我可以显示有多少项目有通过{{ MyMessages.length }}

但是我想知道的是在MyMessages有多少个PosChangeMessage和多少个NegChangeMessage项目。

所以，在上面的例子：

PosChangeMes​​sage = 3

NegChangeMes​​sage = 2

Answer 1

请在这里看到：http://jsbin.com/yaxiya/1/

angular.forEach(MyMessages, function(message){ 

     if(message.PosChangeMessage){ 
     $scope.PosChangeMessage++; 
     } 
     if(message.NegReasonMessage) 
     { 
     $scope.NegChangeMessage++; 
     } 


     }); 

Answer 2

创建其中遍历所述控制器的方法“MyMessages”的长度并计算出相应的值，就像在你的控制器中一样..

for(var i=0;i<MyMessages.length;i++){ 
    if(MyMessages[i].PosChangeMessage!=null){ 
    $scope.posChangeMessageLength++; 
    } 
    if(MyMessages[i].NegReasonMessage!=null){ 
    $scope.negReasonMessageLength++; 
    } 

}