如何從內部具有密鑰對的對象數組中拉取值？

Question

作爲我的應用程序的一部分，我想提取的值爲monthlyIncome，savePercent和年，並將它們保存爲$scope。值，以便在用戶登錄時將它們設置爲默認值！

[ 
    { 
     "$id": "date", 
     "$priority": null, 
     "$value": 1457178818625 
    }, 
    { 
     "$id": "email", 
     "$priority": null, 
     "$value": "a@b.com" 
    }, 
    { 
     "$id": "firstname", 
     "$priority": null, 
     "$value": "test" 
    }, 
    { 
     "$id": "lastname", 
     "$priority": null, 
     "$value": "Isaacs" 
    }, 
    { 
     "$id": "monthly", 
     "$priority": null, 
     "$value": 328947 
    }, 
    { 
     "$id": "monthlyIncome", 
     "$priority": null, 
     "$value": 123 
    }, 
    { 
     "$id": "percent", 
     "$priority": null, 
     "$value": 10 
    }, 
    { 
     "$id": "regUser", 
     "$priority": null, 
     "$value": "4157e8b1-efa2-4feb-bf75-e907c0e200e0" 
    }, 
    { 
     "$id": "savePercent", 
     "$priority": null, 
     "$value": 10 
    }, 
    { 
     "$id": "years", 
     "$priority": null, 
     "$value": 40 
    } 
] 

任何幫助將不勝感激。

Answer 1

可以說你在$scope.data屬性中存儲你的數組。然後你需要檢查這個數組中的每個對象。您可以使用angular.forEach函數來遍歷數組並檢查每個對象。

入住這plunker plnkr.co/edit/WeQhCb?p=preview 或以下代碼：

//for each object in data array 
angular.forEach($scope.data, function(value, key) { 
    // check if value id is equals to 'monthlyIncome' OR 'savePercent' OR 'years' 
    if (value.$id == 'monthlyIncome' || 
     value.$id == 'savePercent' || 
     value.$id == 'years') { 
    // add it's value with the same key (e.g. $scope.monthlyIncome) 
    $scope[value.$id] = value.$value; 
    } 
}); 

---

現在很 $scope

monthlyIncome: {{monthlyIncome}} 
savePercent: {{savePercent}} 
years: {{years}} 

---

或者更優雅的方式來檢查的屬性是在陣列添加所需的道具並檢查是否存在。完整代碼：

(function(angular) { 
    'use strict'; 
    angular.module('app', []) 
    .controller('appController', function($scope, $log) { 
     $scope.data = [{ 
     "$id": "date", 
     "$priority": null, 
     "$value": 1457178818625 
     }, { 
     "$id": "email", 
     "$priority": null, 
     "$value": "a@b.com" 
     }, { 
     "$id": "firstname", 
     "$priority": null, 
     "$value": "test" 
     }, { 
     "$id": "lastname", 
     "$priority": null, 
     "$value": "Isaacs" 
     }, { 
     "$id": "monthly", 
     "$priority": null, 
     "$value": 328947 
     }, { 
     "$id": "monthlyIncome", 
     "$priority": null, 
     "$value": 123 
     }, { 
     "$id": "percent", 
     "$priority": null, 
     "$value": 10 
     }, { 
     "$id": "regUser", 
     "$priority": null, 
     "$value": "4157e8b1-efa2-4feb-bf75-e907c0e200e0" 
     }, { 
     "$id": "savePercent", 
     "$priority": null, 
     "$value": 10 
     }, { 
     "$id": "years", 
     "$priority": null, 
     "$value": 40 
     }]; 

     // required properties for $scope 
     var propertieIDs = ['monthlyIncome', 'savePercent', 'years']; 

     //for each object in data array 
     angular.forEach($scope.data, function(value, key) { 
     // check if value id is in 
     if (propertieIDs.indexOf(value.$id) !== -1) { 
      // add it's value with the same key (e.g. $scope.monthlyIncome) 
      $scope[value.$id] = value.$value; 
     } 
     }); 

    }); 
})(window.angular);