在AngularJS控制器之间共享数据

2020/09/30 08:21 · javascript ·  · 0评论

我正在尝试在控制器之间共享数据。用例是一个多步骤表单,在一个输入中输入的数据以后会在原始控制器之外的多个显示位置中使用。下面和jsfiddle中的代码

的HTML

<div ng-controller="FirstCtrl">
    <input type="text" ng-model="FirstName"><!-- Input entered here -->
    <br>Input is : <strong>{{FirstName}}</strong><!-- Successfully updates here -->
</div>

<hr>

<div ng-controller="SecondCtrl">
    Input should also be here: {{FirstName}}<!-- How do I automatically updated it here? -->
</div>

JS

// declare the app with no dependencies
var myApp = angular.module('myApp', []);

// make a factory to share data between controllers
myApp.factory('Data', function(){
    // I know this doesn't work, but what will?
    var FirstName = '';
    return FirstName;
});

// Step 1 Controller
myApp.controller('FirstCtrl', function( $scope, Data ){

});

// Step 2 Controller
myApp.controller('SecondCtrl', function( $scope, Data ){
    $scope.FirstName = Data.FirstName;
});

任何帮助是极大的赞赏。

一个简单的解决方案是让工厂返回一个对象,并使您的控制器使用对同一对象的引用:

JS:

// declare the app with no dependencies
var myApp = angular.module('myApp', []);

// Create the factory that share the Fact
myApp.factory('Fact', function(){
  return { Field: '' };
});

// Two controllers sharing an object that has a string in it
myApp.controller('FirstCtrl', function( $scope, Fact ){
  $scope.Alpha = Fact;
});

myApp.controller('SecondCtrl', function( $scope, Fact ){
  $scope.Beta = Fact;
});

HTML:

<div ng-controller="FirstCtrl">
    <input type="text" ng-model="Alpha.Field">
    First {{Alpha.Field}}
</div>

<div ng-controller="SecondCtrl">
<input type="text" ng-model="Beta.Field">
    Second {{Beta.Field}}
</div>

演示: http //jsfiddle.net/HEdJF/

当应用程序变得更大,更复杂且更难测试时,您可能不希望以这种方式从工厂公开整个对象,而是例如通过getter和setters提供有限的访问权限:

myApp.factory('Data', function () {

    var data = {
        FirstName: ''
    };

    return {
        getFirstName: function () {
            return data.FirstName;
        },
        setFirstName: function (firstName) {
            data.FirstName = firstName;
        }
    };
});

使用这种方法,由消耗者的控制器来用新值更新工厂,并监视更改以获取新值:

myApp.controller('FirstCtrl', function ($scope, Data) {

    $scope.firstName = '';

    $scope.$watch('firstName', function (newValue, oldValue) {
        if (newValue !== oldValue) Data.setFirstName(newValue);
    });
});

myApp.controller('SecondCtrl', function ($scope, Data) {

    $scope.$watch(function () { return Data.getFirstName(); }, function (newValue, oldValue) {
        if (newValue !== oldValue) $scope.firstName = newValue;
    });
});

HTML:

<div ng-controller="FirstCtrl">
  <input type="text" ng-model="firstName">
  <br>Input is : <strong>{{firstName}}</strong>
</div>
<hr>
<div ng-controller="SecondCtrl">
  Input should also be here: {{firstName}}
</div>

演示: http //jsfiddle.net/27mk1n1o/

我宁愿不使用$watch它。不必将整个服务分配给控制器的作用域,您可以仅分配数据。

JS:

var myApp = angular.module('myApp', []);

myApp.factory('MyService', function(){
  return {
    data: {
      firstName: '',
      lastName: ''
    }
    // Other methods or objects can go here
  };
});

myApp.controller('FirstCtrl', function($scope, MyService){
  $scope.data = MyService.data;
});

myApp.controller('SecondCtrl', function($scope, MyService){
   $scope.data = MyService.data;
});

HTML:

<div ng-controller="FirstCtrl">
  <input type="text" ng-model="data.firstName">
  <br>Input is : <strong>{{data.firstName}}</strong>
</div>
<hr>
<div ng-controller="SecondCtrl">
  Input should also be here: {{data.firstName}}
</div>

或者,您可以使用直接方法更新服务数据。

JS:

// A new factory with an update method
myApp.factory('MyService', function(){
  return {
    data: {
      firstName: '',
      lastName: ''
    },
    update: function(first, last) {
      // Improve this method as needed
      this.data.firstName = first;
      this.data.lastName = last;
    }
  };
});

// Your controller can use the service's update method
myApp.controller('SecondCtrl', function($scope, MyService){
   $scope.data = MyService.data;

   $scope.updateData = function(first, last) {
     MyService.update(first, last);
   }
});

您可以通过多种方式在控制器之间共享数据

  1. 使用服务
  2. 使用$ state.go服务
  3. 使用状态参数
  4. 使用rootscope

每种方法的说明:

  1. 我不会解释,因为有人已经解释过了

  2. 使用 $state.go

      $state.go('book.name', {Name: 'XYZ'}); 
    
      // then get parameter out of URL
      $state.params.Name;
    
  3. $stateparam的工作方式与相似$state.go,您可以将其作为对象从发送方控制器传递,并使用stateparam在接收方控制器中收集

  4. 使用 $rootscope

    (a)将数据从子级发送到父级控制器

      $scope.Save(Obj,function(data) {
          $scope.$emit('savedata',data); 
          //pass the data as the second parameter
      });
    
      $scope.$on('savedata',function(event,data) {
          //receive the data as second parameter
      }); 
    

    (b)将数据从父级发送到子级控制器

      $scope.SaveDB(Obj,function(data){
          $scope.$broadcast('savedata',data);
      });
    
      $scope.SaveDB(Obj,function(data){`enter code here`
          $rootScope.$broadcast('saveCallback',data);
      });
    

我创建了一个工厂来控制路由路径的模式之间的共享范围,因此您可以仅在用户在同一路由父路径中导航时维护共享数据。

.controller('CadastroController', ['$scope', 'RouteSharedScope',
    function($scope, routeSharedScope) {
      var customerScope = routeSharedScope.scopeFor('/Customer');
      //var indexScope = routeSharedScope.scopeFor('/');
    }
 ])

因此,如果用户转到另一个路由路径,例如“ / Support”,则路径“ / Customer”的共享数据将被自动销毁。但是,如果用户选择了“子”路径(例如“ / Customer / 1”或“ / Customer / list”),则作用域将不会被破坏。

您可以在此处查看示例:http : //plnkr.co/edit/OL8of9

有多种方法可以在控制器之间共享数据

  • 角度服务
  • $ broadcast,$ emit方法
  • 家长与孩子之间的沟通
  • $ rootscope

众所周知$rootscope,数据传输或通信不是首选方法,因为它是一个全局范围,可用于整个应用程序

对于Angular Js控制器之间的数据共享,Angular服务是最佳实践,例如。.factory.service

参考

在从父数据传输到子控制器的情况下,你可以通过孩子控制器直接访问父数据$scope

如果您使用的
ui-router话,可以用$stateParmas传递URL参数,如idnamekey,等

$broadcast这也是在控制器之间从父级到子级之间$emit传输数据以及从子级到父级控制器之间传输数据的好方法

的HTML

<div ng-controller="FirstCtrl">
   <input type="text" ng-model="FirstName">
   <br>Input is : <strong>{{FirstName}}</strong>
</div>

<hr>

<div ng-controller="SecondCtrl">
   Input should also be here: {{FirstName}}
</div>

JS

myApp.controller('FirstCtrl', function( $rootScope, Data ){
    $rootScope.$broadcast('myData', {'FirstName': 'Peter'})
});

myApp.controller('SecondCtrl', function( $rootScope, Data ){
    $rootScope.$on('myData', function(event, data) {
       $scope.FirstName = data;
       console.log(data); // Check in console how data is coming
    });
});

请参阅给定的链接以了解更多信息$broadcast

最简单的解决方案:

我已经使用了AngularJS服务

步骤1:我创建了一个名为SharedDataService的AngularJS服务。

myApp.service('SharedDataService', function () {
     var Person = {
        name: ''

    };
    return Person;
});

步骤2:创建两个控制器并使用上面创建的服务。

//First Controller
myApp.controller("FirstCtrl", ['$scope', 'SharedDataService',
   function ($scope, SharedDataService) {
   $scope.Person = SharedDataService;
   }]);

//Second Controller
myApp.controller("SecondCtrl", ['$scope', 'SharedDataService',
   function ($scope, SharedDataService) {
   $scope.Person = SharedDataService;
   }]);

步骤3:只需在视图中使用创建的控制器。

<body ng-app="myApp">

<div ng-controller="FirstCtrl">
<input type="text" ng-model="Person.name">
<br>Input is : <strong>{{Person.name}}</strong>
</div>

<hr>

<div ng-controller="SecondCtrl">
Input should also be here: {{Person.name}}
</div>

</body>

要查看此问题的有效解决方案,请按以下链接

https://codepen.io/wins/pen/bmoYLr

.html文件:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>

<body ng-app="myApp">

  <div ng-controller="FirstCtrl">
    <input type="text" ng-model="Person.name">
    <br>Input is : <strong>{{Person.name}}</strong>
   </div>

<hr>

  <div ng-controller="SecondCtrl">
    Input should also be here: {{Person.name}}
  </div>

//Script starts from here

<script>

var myApp = angular.module("myApp",[]);
//create SharedDataService
myApp.service('SharedDataService', function () {
     var Person = {
        name: ''

    };
    return Person;
});

//First Controller
myApp.controller("FirstCtrl", ['$scope', 'SharedDataService',
    function ($scope, SharedDataService) {
    $scope.Person = SharedDataService;
    }]);

//Second Controller
myApp.controller("SecondCtrl", ['$scope', 'SharedDataService',
    function ($scope, SharedDataService) {
    $scope.Person = SharedDataService;
}]);

</script>


</body>
</html>

还有一种不使用$ watch的方法,而是使用angular.copy:

var myApp = angular.module('myApp', []);

myApp.factory('Data', function(){

    var service = {
        FirstName: '',
        setFirstName: function(name) {
            // this is the trick to sync the data
            // so no need for a $watch function
            // call this from anywhere when you need to update FirstName
            angular.copy(name, service.FirstName); 
        }
    };
    return service;
});


// Step 1 Controller
myApp.controller('FirstCtrl', function( $scope, Data ){

});

// Step 2 Controller
myApp.controller('SecondCtrl', function( $scope, Data ){
    $scope.FirstName = Data.FirstName;
});

有多种方法可以做到这一点。

  1. 活动-已经很好解释了。

  2. ui路由器-上面已说明。

  3. 服务-上面显示了更新方法
  4. 不好-注意变化。
  5. 另一种父子方法,而不是EMITbrodcast -

*

<superhero flight speed strength> Superman is here! </superhero>
<superhero speed> Flash is here! </superhero>

*

app.directive('superhero', function(){
    return {
        restrict: 'E',
        scope:{}, // IMPORTANT - to make the scope isolated else we will pollute it in case of a multiple components.
        controller: function($scope){
            $scope.abilities = [];
            this.addStrength = function(){
                $scope.abilities.push("strength");
            }
            this.addSpeed = function(){
                $scope.abilities.push("speed");
            }
            this.addFlight = function(){
                $scope.abilities.push("flight");
            }
        },
        link: function(scope, element, attrs){
            element.addClass('button');
            element.on('mouseenter', function(){
               console.log(scope.abilities);
            })
        }
    }
});
app.directive('strength', function(){
    return{
        require:'superhero',
        link: function(scope, element, attrs, superHeroCtrl){
            superHeroCtrl.addStrength();
        }
    }
});
app.directive('speed', function(){
    return{
        require:'superhero',
        link: function(scope, element, attrs, superHeroCtrl){
            superHeroCtrl.addSpeed();
        }
    }
});
app.directive('flight', function(){
    return{
        require:'superhero',
        link: function(scope, element, attrs, superHeroCtrl){
            superHeroCtrl.addFlight();
        }
    }
});

不知道我在哪里选择了这种模式,但是可以跨控制器共享数据并减少$ rootScope和$ scope,所以效果很好。它让人想起您拥有发布者和订阅者的数据复制。希望能帮助到你。

服务:

(function(app) {
    "use strict";
    app.factory("sharedDataEventHub", sharedDataEventHub);

    sharedDataEventHub.$inject = ["$rootScope"];

    function sharedDataEventHub($rootScope) {
        var DATA_CHANGE = "DATA_CHANGE_EVENT";
        var service = {
            changeData: changeData,
            onChangeData: onChangeData
        };
        return service;

        function changeData(obj) {
            $rootScope.$broadcast(DATA_CHANGE, obj);
        }

        function onChangeData($scope, handler) {
            $scope.$on(DATA_CHANGE, function(event, obj) {
                handler(obj);
            });
        }
    }
}(app));

正在获取新数据的Controller(即发布服务器)将执行以下操作。

var someData = yourDataService.getSomeData();

sharedDataEventHub.changeData(someData);

同样使用此新数据的Controller(称为订阅服务器)将执行以下操作...

sharedDataEventHub.onChangeData($scope, function(data) {
    vm.localData.Property1 = data.Property1;
    vm.localData.Property2 = data.Property2;
});

这将适用于任何情况。因此,当主控制器初始化并获取数据时,它将调用changeData方法,该方法随后会将其广播给该数据的所有订阅者。这减少了控制器之间的耦合。

做到简单(已通过v1.3.15测试):

<article ng-controller="ctrl1 as c1">
    <label>Change name here:</label>
    <input ng-model="c1.sData.name" />
    <h1>Control 1: {{c1.sData.name}}, {{c1.sData.age}}</h1>
</article>
<article ng-controller="ctrl2 as c2">
    <label>Change age here:</label>
    <input ng-model="c2.sData.age" />
    <h1>Control 2: {{c2.sData.name}}, {{c2.sData.age}}</h1>
</article>

<script>
    var app = angular.module("MyApp", []);

    var dummy = {name: "Joe", age: 25};

    app.controller("ctrl1", function () {
        this.sData = dummy;
    });

    app.controller("ctrl2", function () {
        this.sData = dummy;
    });
</script>

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