将现有模型传递给敲除组件绑定？

Question

我刚刚开始探索淘汰组件，因为我们的代码库在引入这些组件之前就已存在。

一些我第一次阅读时不明白的事情。

如何在 component 绑定中使用现有的视图模型？
调用applyBindings时应该绑定什么？

这是我的意思的一个简单示例。

function Customer() {
  this.name = ko.observable();
  ...
  this.orders = ko.observableArray([]);
}
Customer.prototype.addOrder = function(order) {
  this.orders.push(order);
}
...
function Order() {
  this.date = ko.observable();
  ...
}
...
// HERE I want the component binding in the foreach to use the $data
ko.components.register("Customer", {
  viewModel: Customer,
  template: "<strong data-bind='text: name'></strong><ul data-bind='foreach: orders'><li data-bind='component: "Order"'></li></ul>"
});

ko.components.register("Order", {
  viewModel: Order,
  template: "<span data-bind='text: date'></span>"
});
...

<!-- HERE I would like the component binding to use $data too -->
<div data-bind="component: 'Customer'"></div> 

...

var customer  = new Customer(); 
customer.name = "Test";

var order = new Order();
order.data = new Date();
customer.addOrder(order);

ko.applyBindings(customer);

Answer 1

您可以通过参数 (params) 将现有模型传递给组件：

function Customer(params) {
  this.name = ko.observable(params.name);
  this.orders = ko.observableArray(params.orders);
}
Customer.prototype.addOrder = function(order) {
  this.orders.push(order);
}
function Order(params) {
  this.date = ko.observable(params.date);
}

ko.components.register("customer", {
  viewModel: Customer,
  template: "<strong data-bind='text: name'></strong><ul data-bind='foreach: orders'><li><order params='date: date'></order></li></ul>"
});

ko.components.register("order", {
  viewModel: Order,
  template: "<span data-bind='text: date'></span>"
});

ko.applyBindings({ modelName: "Some Name", orders: [ { date: "01/01/01" } ] });

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>

<customer params="name: modelName, orders: orders"></customer>

更新：无视图模型组件激增（我喜欢@Zoltán Tamási 的这个想法）：

function Customer() {
  this.name = ko.observable();
  this.orders = ko.observableArray([]);
}
Customer.prototype.addOrder = function(order) {
  this.orders.push(order);
}
function Order() {
  this.date = ko.observable();
}
ko.components.register("customer", {
  viewModel: function(params) { return params.model; },
  template: "<strong data-bind='text: name'></strong><ul data-bind='foreach: orders'><li><order params='model: $data'></order></li></ul>"
});

ko.components.register("order", {
  viewModel: function(params) { return params.model; },
  template: "<span data-bind='text: date'></span>"
});

var customer  = new Customer(); 
customer.name = "Test";

var order = new Order();
order.date = new Date(Date.now());
customer.addOrder(order);

ko.applyBindings({ customer: customer });

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>

<customer params="model: customer"></customer>

Answer 2

最后一个问题优先：您仍然 applyBindings 应用程序的视图模型。使用组件不会改变这一点。

组件can receive parameters。这就是你将任何东西传递给他们的视图模型构造函数的方式。

Answer 3

您正在寻找的解决方案是向此视图模型工厂注册您的组件：

ko.components.register("your-element", { 
    template: {...}, 
   { createViewModel: (params, componentInfo) => ko.dataFor(componentInfo.element) };
};

这将为您提供 "pass through" 绑定，例如：

<div data-bind="with: SomeModel">
    <your-element></your-element>
</div>

为您的模板加载的 HTML 中的视图模型将是 SomeModel。

Answer 4

您是否尝试过使用“共享对象实例”，如下所示：http://knockoutjs.com/documentation/component-registration.html#specifying-a-viewmodel？

将现有模型传递给敲除组件绑定？

Passing existing model to knockout component binding?

javascript

knockout.js

knockout-3.0

更新：无视图模型组件激增（我喜欢@Zoltán Tamási 的这个想法）：