比较两个数组并按原样获取数据

Question

我将这样的数据存储在scope变量中

$scope.myData = 
    {
      "firstName": "rocky",
      "lastName": "P",
      "place": "Koraput",
      "education": [
        {
          "id": "764006"
        },
        {
          "id": "764001"
        }
      ],
      "email": "rockyp123@gmail.com",
      "id": "46ads75asda7s6d57ad"
    }

案例：假设我正在更新此数据。 我添加了教育，然后单击“ cancel 。 如何在单击“取消”时删除当前添加的教育，并在单击“ edit user检索仅上述两个教育的数据？

Answer 1

您应该保留两个单独的对象，一个是原始的，未更改的对象，另一个是用于编辑的对象。 用户单击后，说出save ，然后才应该用第二个覆盖第一个对象。 单击cancel ，您可以简单地将可编辑对象的值还原为原始数据的克隆。

首先将第一个对象克隆到新的第二个对象中：

// Your original data (unchanged)
$scope.myData = { /* ... */ };

// Your object for editing purposes
$scope.myDataClone = clone($scope.myData);

$scope.cancel = function() {
  // reset the 'editable' clone to the unchanged value of myData
  $scope.myDataClone = clone($scope.myData);
}

$scope.save = function() {
  // Once the user accepts their changes, you can simply
  // set the value of myData to a clone of the edited data.
  // This will ensure you are not just creating a new pointer
  // from myData to myDataClone, which would cause myData
  // to change if you make subsequent requests to myDataClone.
  $scope.myData = clone($scope.myDataClone);
}

// A clone function which takes an object and returns an exact
// replica as a new object with a unique memory reference
function clone(obj) {
  return JSON.parse(JSON.stringify(obj));
}

Answer 2

您可以使用angular.copy()方法来获取原始数组的副本对象，并在取消时对其进行引用：

 var app = angular.module('demoApp', []); app.controller('demoCtrl', function($scope) { $scope.myData = { "firstName": "rocky", "lastName": "P", "place": "Koraput", "education": [{ "id": "764006" }, { "id": "764001" }], "email": "rockyp123@gmail.com", "id": "46ads75asda7s6d57ad" }; $scope.copy = angular.copy($scope.myData.education); $scope.onAdd = function() { $scope.myData.education.push({ id: $scope.myData.education.length }); }; $scope.onCancel = function() { $scope.myData.education = $scope.copy; // <----reset to original }; }); 

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.0/angular.min.js"></script> <div ng-app="demoApp" ng-controller="demoCtrl"> <pre>{{myData.education}}</pre> <button ng-click="onAdd()">+</button> <button ng-click="onCancel()">X</button> </div> 

Answer 3

使用ID删除

  $scope.myData = 
  {
    "firstName": "rocky",
    "lastName": "P",
    "place": "Koraput",
    "education": [
    {
      "id": "764006"
    },
    {
      "id": "764001"
    }
    ],
    "email": "rockyp123@gmail.com",
    "id": "46ads75asda7s6d57ad"
  };

  //Remove specific item
  $scope.onCancel = function(cancelId){

      for(var i in $scope.myData.education){
       if($scope.myData.education[i].id==cancelId){
        $scope.myData.education.splice(i, 1);;
        break;
      }
    }

  };

Answer 4

您可以创建主要对象的副本，而在取消时可以使用副本更新主要对象

并且在保存时用新对象更新副本

喜欢

$scope.myData = 
  {
    "firstName": "rocky",
    "lastName": "P",
    "place": "Koraput",
    "education": [
    {
      "id": "764006"
    },
    {
      "id": "764001"
    }
    ],
    "email": "rockyp123@gmail.com",
    "id": "46ads75asda7s6d57ad"
  };
$scope.copymyData  = angular.copy($scope.myData);
$scope.cancel = function(){
  $scope.myData = angular.copy($scope.copymyData);
}
$scope.save = function(){
   $scope.copymyData  = angular.copy($scope.myData);
}

Answer 5

我们可以通过使用推入和弹出来实现这一点，

HTML：

  <button ng-click="cancel()">cancel</button>

控制器：

   $scope.myData =[];
   $scope.myData = [
   {
     "firstName": "rocky",
     "lastName": "P",
     "education":'MBA',
     "place": "Koraput",
     "email": "rockyp123@gmail.com",
     "id": "46ads75asda7s6d57ad"
   }];

   $scope.myData.push({
      education : 'BE'
   })

   $scope.cancel = function(){
     var lastElement = $scope.myData.pop();
   }