[英]javascript singleton public method “not a function”
I give up. 我放弃。 I'm usually ac# developer, but I need javascript for this particular project.
我通常是ac#开发人员,但此特定项目需要javascript。
I have a list that I want to be protected with some setters and getters (and also public methods vs private helper methods). 我有一个列表,希望通过一些设置器和获取器(以及公共方法与私有帮助器方法)进行保护。 To do this, I've implemented a singleton pattern following Addy Osmani's Singleton pattern as described in this post: http://robdodson.me/javascript-design-patterns-singleton/
为此,我已按照Addy Osmani的Singleton模式实现了单例模式,如本文中所述: http : //robdodson.me/javascript-design-patterns-singleton/
However, when I try to access the public methods, I get the error "publicMethod is not a function". 但是,当我尝试访问公共方法时,出现错误“ publicMethod不是函数”。
I have a button hooked up to "addToList" and I just want to print out the message to start with. 我有一个连接到“ addToList”的按钮,我只想打印出开始的消息。
Why can't it see my method? 为什么看不到我的方法?
angular
.module('bacnetui')
.controller('bacnetuiController', function($scope, devicesFactory,){
devicesFactory.getDevices().then(function (response){
$scope.devices = response.data;
}, function(error) {
console.log(error);
});
$scope.mySingleton = (function () {
// Instance stores a reference to the Singleton
var instance;
function init() {
// Singleton
var list = [];
// Private methods and variables
function indexOfDevice(dev){
...
}
function hasBacnet(dev,obj,prop){
....
}
function newBacnet(obj,prop){
....
}
return {
// Public methods and variables
publicMethod: function () {
console.log( "The public can see me!" );
},
publicProperty: "I am also public"
};
};
return {
// Get the Singleton instance if one exists
// or create one if it doesn't
getInstance: function () {
if ( !instance ) {
instance = init();
}
return instance;
}
};
})();
$scope.addToList = function(device,obj,prop) {
console.log("found a function: " + $scope.mySingleton.publicMethod());
//$scope.myList.addBacnet(device,obj,prop);
};
$scope.removeFromList = function(device,obj,prop) {};
$scope.saveToFile = function(){
};
});
You need to use $scope.mySingleton.getInstance().publicMethod()
as @Robby pointed out in the comment. 您需要使用
$scope.mySingleton.getInstance().publicMethod()
在注释中指出的$scope.mySingleton.getInstance().publicMethod()
。
Following is the flow: 以下是流程:
$scope.mySingleton = (function () {
...
function init() {
...
return {
publicMethod: function () {
...
},
};
};
return {
// Get the Singleton instance if one exists
// or create one if it doesn't
getInstance: function () {
if ( !instance ) {
instance = init();
}
return instance;
}
};
})();
The above structure returns mySingleton
with an object assigned to it as: 上面的结构返回
mySingleton
,并mySingleton
分配了一个对象,如下所示:
{
getInstance: function() {...}
}
Once you call that then you have access to what init()
returned which is the target publicMethod()
. 一旦调用它,就可以访问返回的
init()
,它是目标publicMethod()
。
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