javascript 视图模型之外的 Knockout.js 调用方法
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Knockout.js calling method outside of view model
提问by Phil Ninan
I want to make my data accessible outside of my view model. So I created a view model object but I'm having trouble binding its properties. Note that everything is working properly inside my view model.
我想让我的数据在我的视图模型之外访问。所以我创建了一个视图模型对象，但我在绑定它的属性时遇到了麻烦。请注意，在我的视图模型中一切正常。
Basically a simplified pseudo-code:
基本上是一个简化的伪代码：
function Users() {
name;
date;
}
function userHealthModel() {
function createUsers() { new Users[] };
}
self.userModel = ko.observable(new userHealthModel());
self.userModel.createUsers();
If I call the createUsersmethod inside my model my bind works fine.
如果我createUsers在模型中调用该方法，则绑定工作正常。
Here is a jsFiddle, note my problem is all the way at the end of the JS, I commented it: http://jsfiddle.net/fourgates/jpk22/1/
这是一个jsFiddle，注意我的问题一直在JS的末尾，我评论了它：http: //jsfiddle.net/fourgates/jpk22/1/
I'm new to JS and KO. not really sure how to use $root, $parent, etc. Please help a fellow programming enthusiast! Many thanks in advance!
我是 JS 和 KO 的新手。不太确定如何使用 $root、$parent 等。请帮助编程爱好者！提前谢谢了！
回答by Niko
I'm still not 100% sure if I understand what you're trying to do, but here are some thoughts about the code in your fiddle:
我仍然不能 100% 确定我是否理解你想要做什么，但这里有一些关于你小提琴中的代码的想法：
If you have something like
如果你有类似的东西
var self = this;
in the global scope (= not in a function), thispoints to the window object. Therefore this does not make any sense.
在全局范围内（= 不在函数中），this指向 window 对象。因此，这没有任何意义。
self.userModel = ko.observable(new userHealthModel());
Creating an observable of a view model is not necessary - you don't expect the whole model to change, right? It will always stay a user model and not suddenly become a "message model" or whatever.
创建视图模型的 observable 不是必需的 - 您不希望整个模型发生变化，对吗？它将始终保持用户模型，而不会突然变成“消息模型”或其他什么。
If you want to call a method of your view model from the outside, just make an instance:
如果要从外部调用视图模型的方法，只需创建一个实例：
var userModel = new userHealthModel();
userModel.createUsers();
// Use "userModel" to access the methods and properties
// like you're using "self" inside the view model:
userModel.users2()[1].userId(5);
// now apply the binding to THE SAME view model
ko.applyBindings(userModel);
If this isn't what you were looking for, let me know!
如果这不是您要找的，请告诉我！
