在 AngularJS 服务中处理数据绑定 [英] Handling data binding in AngularJS Services

问题描述

我想弄清楚当我的数据存储在服务中时您如何正确处理绑定.

如果将服务放入 $scope 中，然后让模板直接绑定到它，我可以让事情正常工作，但这似乎是一个非常糟糕的主意.

我基本上希望拥有它，以便我的视图/控制器能够轻松地更改服务中的状态并将其反映到任何地方.

感觉我应该能够做类似以下的事情，但它不起作用(http://jsfiddle.net/aidankane/AtRVD/1/).

HTML

<select ng-model="drawing" ng-options="d.file for d in graphics"></select>
<div ng-controller="MyOtherCtl">{{ 画画 }}

JS

var myApp = angular.module('myApp', []);myApp.factory('myService', function(){变量我 = {图纸:[{'file':'a'}, {'file':'b'}]};//选中的图me.drawing = me.drawings[0];还我；});函数 MyCtl($scope, myService){//可以做://$scope.mys = myService;//然后在 html ng-model="mys.drawing"//但这似乎是错误的$scope.drawings = myService.drawings;$scope.drawing = myService.drawing;//我可以不这样做吗?无论如何它似乎不起作用......$scope.$watch('绘图', 函数(绘图){myService.drawing = 绘图；});}函数 MyOtherCtl($scope, myService){$scope.drawing = myService.drawing;}MyCtl.$inject = ['$scope', 'myService'];MyOtherCtl.$inject = ['$scope', 'myService'];

解决方案

您可以使用 $watch 绑定到服务并传递一个函数:

$scope.$watch( function () { return myService.drawing; }, function (drawing ) {//在这里处理.例如.:$scope.drawing = 绘图；});

然后在你的模板中使用 $scope.drawing ，它们会自动更新:

{{ 画画 }}

I'm trying to figure out how you handle binding properly when my data is stored in a service.

I can get things working if it put the service into the $scope and then get the templates to bind directly into it but that seems like a really bad idea.

I'd basically like to have it so that my views / controllers are able to easily change the state down in a service and have that reflected everywhere.

It feels like I should be able to do something like the following, but it doesn't work (http://jsfiddle.net/aidankane/AtRVD/1/).

HTML

<div ng-controller="MyCtl">
    <select ng-model="drawing" ng-options="d.file for d in drawings"></select>
</div>
<div ng-controller="MyOtherCtl">
    {{ drawing }}
</div>

JS

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

myApp.factory('myService', function(){
    var me = {
        drawings: [{'file':'a'}, {'file':'b'}]
    };
    // selected drawing
    me.drawing = me.drawings[0];
    return me;
});

function MyCtl($scope, myService){
    // can do:
    // $scope.mys = myService;
    // and then in html ng-model="mys.drawing"
    // but that seems wrong

    $scope.drawings = myService.drawings;
    $scope.drawing = myService.drawing;

    // can I not do this? it doesn't seem to work anyway...
    $scope.$watch('drawing', function(drawing){
        myService.drawing = drawing;
    });
}

function MyOtherCtl($scope, myService){
    $scope.drawing = myService.drawing;
}

MyCtl.$inject = ['$scope', 'myService'];
MyOtherCtl.$inject = ['$scope', 'myService'];

解决方案

You can bind to services using $watch and passing a function:

$scope.$watch( function () { return myService.drawing; }, function ( drawing ) {
  // handle it here. e.g.:
  $scope.drawing = drawing;
});

And then use $scope.drawing in your templates and they will automatically update:

<div ng-controller="MyOtherCtl">
  {{ drawing }}
</div>

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