在自定义元素(components.register)中使用时，敲除js foreach绑定不会更新 [英] knockout js foreach binding is not updating when used in custom element (components.register)

问题描述

  ko.components.register("toast-container", {
    viewModel: ToastViewModel,
    template: '<div data-bind="foreach: array1"><div data-bind="text:someText"> </div></div>'
});

function ToastViewModel(params) {
    var self = this;
    self.array1 = ko.observableArray();
    self.Onclick = function () {
        self.array1.push({ someText: "some content" });
    }
}
$(function () {
    ko.applyBindings(new ToastViewModel());
});

当我动态地在array1中推送某些内容时，UI不会更新. 请帮助我.

When i push some content in array1 dynamically, the UI is not updating. Please help me.

推荐答案

检查此内容:

ko.components.register("toast-container", {
    viewModel: ToastViewModel,
    template: '<div class="array" data-bind="foreach: array1"><div data-bind="text:someText"> </div>  </div>    <button data-bind="click: Onclick">Click me</button>      '
});

function ToastViewModel(params) {
    var self = this;
    self.array1 = ko.observableArray();
    self.Onclick = function () {
        //alert("click!");
        self.array1.push({ someText: "some content" });
    }
}
$(function () {
    ko.applyBindings({}, $("#host")[0]);
});

#host {
    width: 300px;
    height: 300px;
    border: 1px solid red;
}

.array {
    border: 1px solid green;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="host">
    <div data-bind="component: { name: 'toast-container'}"></div>
</div>

注意:该模型是在组件内部创建的，因此您无需在applyBindings函数调用中创建一个新模型.

Note: the model is created inside component, thus you need not to create a new one in the applyBindings function call.

更新1:按钮在组件外部，组件模型已拆分.

Update 1: Button is outside the component, component model has been splitted.

ko.components.register("toast-container", {
    viewModel: ToastContainerViewModel,
    template: '<div class="array" data-bind="foreach: array"><div data-bind="text:someText"> </div>  </div>          '
});

function ToastContainerViewModel(params) {
    self.array = params.array;
}
function ToastViewModel(params) {
    var self = this;
    self.array1 = ko.observableArray();
    self.Onclick = function () {
        //alert("click!");
        self.array1.push({ someText: "some content" });
    }
}
$(function () {
    ko.applyBindings(new ToastViewModel(), $("#host")[0]);
});

#host {
    width: 300px;
    height: 300px;
    border: 1px solid red;
}

.array {
    border: 1px solid green;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="host">
    <button data-bind="click: Onclick">Click me</button>
    <toast-container params="array: array1"></toast-container>
</div>

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