我最近开始使用 requirejs,当我尝试创建一个简单的视图模型时,我遇到了一个奇怪的异常。异常来自 knockout-2.1.0.js 文件,异常是“只有可订阅的事物才能充当依赖项”。
define("PageViewModel", ["knockout-2.1.0"], function(ko) {
return function PageViewModel() {
var self = this;
self.visiblePage = ko.observable("StartPage");
self.showPage = function (pageName) {
self.visiblePage(pageName);
};
};
});
正如您所看到的,viewmodel 非常简单,并且由于错误出现在敲除 js 文件中,因此似乎 requirejs 正在正常工作。我一直在看:http ://knockoutjs.com/documentation/amd-loading.html 来的时候出现异常:self.visiblePage = ko.observable("StartPage");
关于我做错了什么的任何想法?
谢谢,路德维希
更新:这是包含 pageviewmodel 的模块:
define("ViewModelFactory", ["StorageService", "PageViewModel", "AddUnitViewModel", "AddRoomViewModel"],
function (StorageService, PageViewModel, AddUnitViewModel, AddRoomViewModel) {
//var repositoryStorage = new StorageService();
var createAddRoomVM = function () {
var vm = new AddRoomViewModel();
vm.setRepository = StorageService.getRoomRepository();
return vm;
};
var createAddUnitVM = function () {
var vm = new AddUnitViewModel();
vm.setRepository = StorageService.getUnitRepository();
return vm;
};
var createPageVM = function () {
var vm = new PageViewModel();
return vm;
};
return {
createPageVM:createPageVM,
createAddRoomVM: createAddRoomVM,
createAddUnitVM: createAddUnitVM
};
});
以及调用工厂的模块
define("ApplicationViewModel", ["ViewModelFactory"],
function (viewModelFactory) {
mainVM = null;
var initVM = function () {
mainVM = {
page: viewModelFactory.createPageVM(),
addRoom: viewModelFactory.createAddRoomVM(),
addUnit: viewModelFactory.createAddUnitVM()
};
};
var getVM = function (viewName) {
switch (viewName) {
case "AddRoom":
return mainVM.addRoom;
case "AddUnit":
return mainVM.addUnit;
default:
return null;
}
};
var getPageVM = function () {
return mainVM.page;
};
return {
initVM: initVM,
getVM: getVM,
getPageVM: getPageVM,
mainVM: mainVM
};
});
以及包含 applicationViewModel 的类:
define("Bootstrapper", ["knockout-2.1.0", "Routing", "ApplicationViewModel"],
function (ko, routing, applicationViewModel) {
var run = function () {
applicationViewModel.initVM(); <-- after here mainVM.page is null
var mainVM = applicationViewModel.mainVM;
routing.initRouting(applicationViewModel);
ko.applyBindings(mainVM);
routing.showView("StartPage");
alert("Start");
};
return {
run: run
};
})