使用淘汰赛&foreach'遍历多维数组 [英] Working with Knockout 'foreach' looping through multidimensional array
问题描述
我有一个多维关联数组.
I have a multidimensional associative array.
this.items = ko.observableArray([
{ name: "name1", viewable: true, children: [
{ name: "name1-1", viewable: true, children: []},
{ name: "name1-2", viewable: false, children: []}
] },
{ name: "name2", viewable: false, children: [] },
{ name: "name3", viewable: true, children: [
{ name: "name3-1", viewable: true, children: []},
] },
{ name: "name4", viewable: true, children: [] }
]);
目标是遍历此数组并仅打印出将'viewable'设置为true的值.
The goal is to loop through this array and print out only the values that have 'viewable' set to true.
我使用一堆if和foreach语句来完成这项工作,但是代码开始变得一发不可收拾.此示例仅涉及2个级别,购买我的阵列可以达到 5个级别,因此此代码将成倍增加,并且真正快速.
I have this working using a bunch of if and foreach statements, but the code is starting to get out of hand. This example only covers 2 levels buy my array can get up to 5 levels deep, so this code is going to multiply and get ugly really quick.
<ul data-bind="foreach: items">
<!-- ko if: viewable -->
<li data-bind="text: name"></li>
<!-- ko foreach: children -->
<!-- ko if: viewable -->
<li data-bind="text: name"></li>
<!-- /ko -->
<!-- /ko -->
<!-- /ko -->
</ul>
那么有没有更简单/更好的方法来遍历整个数组?
So is there an easier/better way to loop through the entire array?
推荐答案
Underscore.js 有一些不错的方法可以与数组,也许您可以使用 flatten 和过滤器从您的结构中创建一个数组,然后您只需编写一个 foreach
:
Underscore.js has some nice method working with arrays maybe you can use flatten and filter to create one array from your structure then you can just write one foreach
:
或者您可以使用模板封装 if:可见
逻辑并递归应用模板:
Or you could use templates to encapsulate your if: viewable
logic and apply the template recursively:
<script type="text/html" id="template">
<!-- ko if: viewable -->
<li data-bind="text: name"></li>
<!-- ko template: { name: 'template', foreach: $data.children } -->
<!-- /ko -->
<!-- /ko -->
</script>
<ul data-bind="template: { name: 'template', foreach: items } ">
</ul>
演示 JSFiddle.
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