我使用Ionic和phonegap-nfc编写了一个小型演示应用程序,它可以读取NFC标签中的唯一ID。
现在,我正在尝试创建一个显示先前读取事件的列表。应该在此列表中添加一个事件,以便读取标记。
我有一个可以添加事件的列表。代码如下所示:
<ion-view view-title="Usage History">
<ion-content>
<button class="button button-icon" ng-click="newTask()">
<i class="icon ion-compose"></i>
</button>
<ion-list>
<ion-item class="item-remove-animate item-avatar item-icon-right" ng-repeat="chat in chats" type="item-text-wrap" href="#/tab/tasks/{{task.id}}">
<img ng-src="{{task.pic}}">
<h2>{{task.name}}</h2>
<p>{{task.lastText}}</p>
<i class="icon ion-chevron-right icon-accessory"></i>
<ion-option-button class="button-assertive" ng-click="remove(task)">
Delete
</ion-option-button>
</ion-item>
</ion-list>
<script id="new-task.html" type="text/ng-template">
<div class="modal">
<!-- Modal header bar -->
<ion-header-bar class="bar-secondary">
<h1 class="title">New Task</h1>
<button class="button button-clear button-positive" ng-click="closeNewTask()">Cancel</button>
</ion-header-bar>
<!-- Modal content area -->
<ion-content>
<form ng-submit="createTask(task)">
<div class="list">
<label class="item item-input">
<input type="text" placeholder="What do you need to do?" ng-model="task.name">
</label>
</div>
<div class="padding">
<button type="submit" class="button button-block button-positive">Create Task</button>
</div>
</form>
</ion-content>
</div>
</script>
</ion-content>
</ion-view>
控制器如下所示:
.controller('TasksCtrl', function($scope, $ionicModal) {
$scope.tasks= [];
// Create and load the Modal
$ionicModal.fromTemplateUrl('new-task.html', function(modal) {
$scope.taskModal = modal;
}, {
scope: $scope,
animation: 'slide-in-up'
});
// Called when the form is submitted
$scope.createTask = function(task) {
$scope.chats.push({
name: task.name
});
$scope.taskModal.hide();
task.name= "";
};
// Open our new task modal
$scope.newTask = function() {
$scope.taskModal.show();
};
// Close the new task modal
$scope.closeNewTask = function() {
$scope.taskModal.hide();
};
$scope.remove = function(task) {
tasks.remove(task);
};
})
所有这一切都很好。您有一个按钮,可以打开一个模态,您可以在其中添加任务。按下按钮关闭模态,任务现在在列表中。
但是,我想在读取NFC标签时自动创建任务。我是一个使用Angular的初学者,所以我不知道如何用与phonegap-nfc相对应的NFC动作替换“ng-click”动作。
NFC事件的控制器如下所示:
.controller('MainController', function ($scope, nfcService) {
$scope.tag = nfcService.tag;
$scope.clear = function() {
nfcService.clearTag();
};
})
.factory('nfcService', function ($rootScope, $ionicPlatform) {
var tag = {};
$ionicPlatform.ready(function() {
nfc.addTagDiscoveredListener(function (nfcEvent) {
console.log(JSON.stringify(nfcEvent.tag, null, 4));
$rootScope.$apply(function(){
angular.copy(nfcEvent.tag, tag);
// if necessary $state.go('some-route')
});
}, function () {
console.log("Listening for tags.");
}, function (reason) {
alert("Error adding NFC Listener " + reason);
});
nfc.addMimeTypeListener('', function (nfcEvent) {
console.log(JSON.stringify(nfcEvent.tag, null, 4));
$rootScope.$apply(function(){
angular.copy(nfcEvent.tag, tag);
// if necessary $state.go('some-route')
});
});
});
return {
tag: tag,
clearTag: function () {
angular.copy({}, this.tag);
}
};
});
我该怎么做?
答案 0 :(得分:2)
你的nfcService已经在监听tagDiscovered事件,所以你只需让TaskCtrl知道发生了什么事。要做到这一点,你有几个选择
一个。在nfcService
中function CalendarCtrl($mdDialog, $http, $rootScope, $timeout, User, Auth, UserService) {
var ctrl = this;
angular.extend(ctrl, {
getCurrentUser: Auth.getCurrentUser,
getUsers: UserService.getUsers,
isAdmin: Auth.isAdmin,
addUser: addUser,
users: UserService.userList,
newUser: {}
});
init();
function init() {
ctrl.getUsers();
initNewUser();
}
function initNewUser() {
ctrl.newUser = { email: "", role: "" };
}
function addUser() {
UserService.addUser(ctrl.newUser)
.success(function(newUser){
console.log("Controller: user has been added: ", newUser);
})
.error(function(err){
console.log("Controller: Add user error: ", err);
})
.finally(function() {
initNewUser();
});
}
}
湾在TaskCtrl
中$rootScope.$emit('tagFound', tag);
一个。在nfcService中添加功能
$rootScope.$on('tagFound', function(tag) {
newTask();
});
湾在taskCtrl
中var cb = null;
this.registerListener = function (callback){
this.cb = callback;
}
// inside addTagDiscoveredListener
...
cb.call(tag)
转到新状态
//在nfcService中 $ state.go( '/任务/添加');
我通常会做选项2,但不要忘记取消注册以解除对垃圾收集的阻止。服务不应该关心国家,所以选项3不是最好的方式imho