Ian*_*Ian 1 javascript checkbox angularjs ionic-framework
我需要跟踪用户何时更改Ionic中复选框的状态,将其保存到localStorage,然后再使用它再次加载 - 因此它会记住它们的设置.
我的切换代码如下所示:
<li class="item item-toggle">
National Insurance {{ni_toggle}}
<label class="toggle toggle-positive">
<input type="checkbox" ng-model="ni_toggle" ng-click="updateLocalStorage()" id="has_national_insurance" name="has_national_insurance">
<div class="track">
<div class="handle"></div>
</div>
</label>
</li>
在我的控制器中,我有:
angular.module('starter.controllers', [])
.controller('SettingsCtrl', function($scope, $ionicPlatform) {
$ionicPlatform.ready(function() {
// Ready functions
});
$scope.updateLocalStorage = function() {
window.localStorage.setItem( 'has_national_insurance', $scope.ni_toggle );
console.log( $scope.ni_toggle );
}
})
但是,它会以控制台的形式注销到控制台undefined.如果我明确设置$scope.ni_toggle = false;它将记录false,并且当我将复选框切换为on时不会更新为true.
编辑:
app.js:
// Ionic Starter App
// angular.module is a global place for creating, registering and retrieving Angular modules
// 'starter' is the name of this angular module example (also set in a <body> attribute in index.html)
// the 2nd parameter is an array of 'requires'
// 'starter.services' is found in services.js
// 'starter.controllers' is found in controllers.js
angular.module('starter', ['ionic', 'starter.controllers', 'starter.services'])
.run(function($ionicPlatform) {
$ionicPlatform.ready(function() {
// Hide the accessory bar by default (remove this to show the accessory bar above the keyboard
// for form inputs)
if(window.cordova && window.cordova.plugins.Keyboard) {
cordova.plugins.Keyboard.hideKeyboardAccessoryBar(true);
}
if(window.StatusBar) {
// org.apache.cordova.statusbar required
StatusBar.styleDefault();
}
});
})
.config(function($stateProvider, $urlRouterProvider) {
// Ionic uses AngularUI Router which uses the concept of states
// Learn more here: https://github.com/angular-ui/ui-router
// Set up the various states which the app can be in.
// Each state's controller can be found in controllers.js
$stateProvider
// setup an abstract state for the tabs directive
.state('tab', {
url: "/tab",
abstract: true,
templateUrl: "templates/tabs.html"
})
// Each tab has its own nav history stack:
.state('tab.dash', {
url: '/dash',
views: {
'tab-dash': {
templateUrl: 'templates/tab-dash.html',
controller: 'DashCtrl'
}
}
})
.state('tab.settings', {
url: '/settings',
views: {
'tab-settings': {
templateUrl: 'templates/tab-settings.html',
controller: 'SettingsCtrl'
}
}
})
.state('tab.info', {
url: '/info',
views: {
'tab-info': {
templateUrl: 'templates/tab-info.html',
controller: 'InfoCtrl'
}
}
})
.state('tab.about', {
url: '/about',
views: {
'tab-about': {
templateUrl: 'templates/tab-about.html',
controller: 'AboutCtrl'
}
}
})
// if none of the above states are matched, use this as the fallback
$urlRouterProvider.otherwise('/tab/dash');
});
controllers.js:
angular.module('starter.controllers', [])
.controller('DashCtrl', function($scope) {
})
.controller('SettingsCtrl', function($scope, $window, $ionicPlatform) {
$ionicPlatform.ready(function() {
});
$scope.ni_toggle = $window.localStorage.getItem('has_national_insurance') === "true";
$scope.updateLocalStorage = function() {
$window.localStorage.setItem( 'has_national_insurance', $scope.ni_toggle );
console.log( $scope.ni_toggle );
}
})
.controller('InfoCtrl', function($scope) {
})
.controller('AboutCtrl', function($scope) {
});
模板/制表settings.html:
<li class="item item-toggle">
National Insurance {{ni_toggle}}
<label class="toggle toggle-positive">
<input type="checkbox" ng-model="ni_toggle" ng-change="updateLocalStorage()" id="has_national_insurance" name="has_national_insurance">
<div class="track">
<div class="handle"></div>
</div>
</label>
</li>
我不熟悉Ionic的奇怪之处(如果有的话),但从一般的JS角度来看,你的代码似乎存在一些问题.
你没有初始化ni_toggle.
您正在使用ngClick哪个将在指令更新模型之前被触发ngModel.
你应该使用ngChange.
在Angular中,您应该使用$window而不是window(它没有受到伤害,并且在许多情况下它可以证明是有用的(例如测试)).
请注意,localStorage只能存储字符串(不是布尔值).所以,即使你通过false,它也会被存储为'false',这相当于转换true为布尔值时.
考虑到上述因素,您的代码应如下所示:
<input type="checkbox" ng-model="ni_toggle" ng-change="updateLocalStorage()" ... />
.controller('SettingsCtrl', function($scope, $window, $ionicPlatform) {
$ionicPlatform.ready(function() {
// Ready functions
});
$scope.ni_toggle = $window.localStorage.getItem('has_national_insurance') === 'true';
$scope.updateLocalStorage = function () {
$window.localStorage.setItem('has_national_insurance', $scope.ni_toggle);
console.log($scope.ni_toggle);
};
});
另见这个简短的演示.
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