篩選器$ scope錯誤：未知的提供者：$ scopeProvider < - $ scope < - transformSensorStatusFilter

Question

marsApp.filter("transformSensorStatus", function($scope) { 
    return function(input, options) { 

    var sensorReading = (input ? (input/1000) : 0); 
    var sensorLowLimit = (options["lowLimit"] ? (options["lowLimit"]/1000) : 0); 
    var sensorHighLimit = (options["highLimit"] ? (options["highLimit"]/1000) : 0); 
    var curStat; 
    switch (sensorReading) { 
     case 255: 
     case 254: 
     case 253: 
      curStat = generateStateInnerHtml(sensorReading); 
      break; 
     default: 
      curStat = generateStateInnerHtml(options["sensorStatus"]); 

    } 

    return curStat; 


    function generateStateInnerHtml(state) { 

     var stateHtml = null; 

     if (state == 255 || state == 254) { 
      stateHtml = "a"; 
      $scope.sensorStateColor=''; 
      return state_html; 
     } 
     if (state == 253) { 
      stateHtml = "b"; 
      $scope.sensorStateColor="text-warning"; 
      return state_html; 
     } 
     if (state >= 0x20) { 
      stateHtml = "c"; 
      $scope.sensorStateColor="text-error"; 
      return stateHtml; 
     } 
     if (state >= 0x02) { 
      stateHtml = "d"; 
      $scope.sensorStateColor="text-error"; 
      return stateHtml; 
     } 
     if (state == 0x01) { 
      stateHtml = "e"; 
      $scope.sensorStateColor="text-success"; 
      return stateHtml; 
     } 
     stateHtml = "N/A"; 
     return stateHtml; 
    } 
} 

}）;

在Chrome中，我得到以下錯誤：

Error: Unknown provider: $scopeProvider <- $scope <- transformSensorStatusFilter

Answer 1

的$scope僅用於控制器和指令的鏈接功能可用。這就是過濾器無法找到它的原因。也許你的意思是$rootScope？

Answer 2

我發現「this」引用了本地$ scope（在filter函數內部）。不知道這是否是安全的訪問方式。