angularjs和localStorage更改事件

时间:2013-04-22 15:00:34

标签: javascript angularjs local-storage

我将一些数据存储在localStorage

中 在我的angularjs应用程序中我想要的是,当localStorage中的数据发生变化时,应用程序会重新呈现应用程序,我该怎么做?

4 个答案:

答案 0 :(得分:29)

有一个有角度的localStorage模块:

https://github.com/grevory/angular-local-storage

var DemoCtrl = function($scope, localStorageService) {

  localStorageService.clearAll();

  $scope.$watch('localStorageDemo', function(value){
    localStorageService.add('localStorageDemo',value);
    $scope.localStorageDemoValue = localStorageService.get('localStorageDemo');
  });

  $scope.storageType = 'Local storage';

  if (!localStorageService.isSupported()) {
    $scope.storageType = 'Cookie';
  }

};

经过进一步思考后,您可能需要将模块更改为在setItem上广播,以便在localStorage已更改时收到通知。也许叉子和第50行:

localStorage.setItem(prefix+key, value);
$rootScope.$broadcast('LocalStorageModule.notification.setItem',{key: prefix+key, newvalue: value});  // you could broadcast the old value if you want

或在最近版本的库中更改了外壳

$rootScope.$broadcast('LocalStorageModule.notification.setitem',{key: prefix+key, newvalue: value}); 

然后在您的控制器中,您可以:

$scope.$on('LocalStorageModule.notification.setItem', function(event, parameters) {
   parameters.key;  // contains the key that changed
   parameters.newvalue;  // contains the new value
});

以下是第二个选项的演示: 演示:http://beta.plnkr.co/lpAm6SZdm2oRBm4LoIi1

**更新**

我分叉了该项目,并在您要使用此项目的事件中包含了通知:https://github.com/sbosell/angular-local-storage/blob/master/localStorageModule.js

我相信原来的图书馆接受了我的公关。我喜欢这个库的原因是它有一个cookie备份,以防浏览器不支持本地存储。

答案 1 :(得分:26)

顺便提一下,我为AngularJS创建了另一个localStorage模块,名为 ngStorage

<强> https://github.com/gsklee/ngStorage

用法非常简单:

<强>的JavaScript

$scope.$storage = $localStorage.$default({
    x: 42
});

<强> HTML

<button ng-click="$storage.x = $storage.x + 1">{{$storage.x}}</button>

每次更改都会自动同步 - 甚至在其他浏览器标签中也会发生变化!

查看GitHub项目页面以获取更多演示和示例;)

答案 2 :(得分:5)

我最近创建了一个模块,允许您简单地将localStorage键绑定到$ scope变量,还可以直接在localStorage中存储Objects,Arrays,Booleans等。

Github localStorage Module

答案 3 :(得分:1)

$scope.$on("LocalStorageModule.notification.setitem", function (key, newVal, type) {
      console.log("LocalStorageModule.notification.setitem", key, newVal, type);
    });

$scope.$on("LocalStorageModule.notification.removeitem", function (key, type) {
  console.log("LocalStorageModule.notification.removeitem", key, type);
});

$scope.$on("LocalStorageModule.notification.warning", function (warning) {
  console.log("LocalStorageModule.notification.warning", warning);
});

$scope.$on("LocalStorageModule.notification.error", function (errorMessage) {
  console.log("LocalStorageModule.notification.error", errorMessage);
});

此事件在使用时调用  https://github.com/grevory/angular-local-storage#getstoragetype

在app config中

myApp.config(function (localStorageServiceProvider) {
  localStorageServiceProvider
    .setPrefix('myApp')
    .setStorageType('sessionStorage')
    .setNotify(true, true)
});