javascript - ion-toggle ng-change无法通过 Controller +服务结构正确触发

我创建了一个切换列表以选择蓝牙设备并进行连接，并为它们创建了controller.js和service.js。但是，ng-change仅在离子开关首次加载到视野中时触发，之后不触发更改。

这是我的setting.html片段：

<ion-toggle ng-repeat="item in devicesList"
            ng-model="item.checked"
            ng-change="connectDevice(devicesList)">
     {{ item.address }}
</ion-toggle>

这是我的settingController.js：

(function () {
    'use strict';

    angular.module('i18n.setting').controller('SettingController', SettingController);
    SettingController.$inject = ['$scope','SettingService'];

    function SettingController($scope, SettingService) {
        $scope.devicesList = [];
        $scope.scanDevices = SettingService.scanDevices($scope.devicesList);
        $scope.connectDevice = SettingService.connectDevice($scope.devicesList);
    };

})();

这是我的settingService.js：

(function(){
    'use strict';

    angular.module('i18n.setting').service('SettingService', SettingService);

    SettingService.$inject = [];
    function SettingService(){
        var self = this;

        this.scanDevices = function(devicesCollection) {
            window.bluetoothSerial.discoverUnpaired(function(devices) {
                console.log("in discoverUnpaired callback, setting page");
                devices.forEach(function(device) {
                    console.log(device.name);
                    device.checked = false;
                    devicesCollection.push(device);
                });

            }, function(error) {
                console.log("in discoverUnpaired error function");
                console.log(error);
            });
        };

        this.connectDevice = function(devicesCollection) {
            console.log(devicesCollection);
            console.log("In connectDevice");
            for (var i =0; i<devicesCollection.length; i++)
            {
                console.log(devicesCollection[i].id + " " + devicesCollection[i].checked);
                if (devicesCollection[i].checked == true)
                {
                    console.log(devicesCollection[i].name);
                    window.bluetoothSerial.connect(devicesCollection[i].address,
                        function(data) {console.log("This device is"+macaddress); console.log(data);},
                        function(error) {console.log(error);});
                }
            }
        };
    }
})();

而且，如果我直接在settingController.js中定义此函数，则它可以正常工作，并且可以检测到切换的每个更改。另外，我注意到即使不单击按钮，我的scanDevices函数也会被触发。我不知道为什么。会有人告诉我这是什么原因吗？任何帮助，谢谢

最佳答案

控制器应将服务功能放在示波器上。而不是服务功能的调用。

(function () {
    'use strict';

    angular.module('i18n.setting').controller('SettingController', SettingController);
    SettingController.$inject = ['$scope','SettingService'];

    function SettingController($scope, SettingService) {
        $scope.devicesList = [];
        //$scope.scanDevices = SettingService.scanDevices($scope.devicesList);
        $scope.scanDevices = SettingService.scanDevices;
        //$scope.connectDevice = SettingService.connectDevice($scope.devicesList);
        $scope.connectDevice = SettingService.connectDevice;
    };

})();

由于scanDevices函数没有return语句，因此scanDevices($scope.deviceList)返回undefined。因此，$scope.scanDevices被设置为undefined。



更新资料


  您还能解释为什么在我按下“扫描”按钮之前调用scanDevices吗？
  
  绑定到：

<button class="button button-stable"
        ng-click="scanDevices(devicesList)">Scan Devices
</button>

通过将函数的调用绑定到范围变量而不是函数本身：

//ERRONEOUS
$scope.scanDevices = SettingService.scanDevices($scope.devicesList);

//CORRECT
$scope.scanDevices = SettingService.scanDevices;

表达式SettingService.scanDevices($scope.devicesList)在单击按钮之前调用该函数。并将undefined分配给$scope.scanDevices变量。

关于javascript - ion-toggle ng-change无法通过 Controller +服务结构正确触发，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38986090/