在淘汰赛视图中访问 $parent 的 $parent - 嵌套上下文 [英] Access $parent's $parent in knockout view - nesting context
问题描述
为简洁起见进行了更新
如何在嵌套的 Knockout foreach/with bindings 中引用 $parents 的 $parent?
How can I reference the $parents' $parent in nested Knockout foreach / with bindings?
示例 -
<!-- ko foreach: grandParent -->
<tr>
<!-- ko foreach: $parent.parents --> // <-- Doesn't work
<!-- ko foreach: children -->
<td data-bind="if: favToy().name == $parent.$parent.favToy().name">
<span data-bind="text: favToy().name"></span>
</td>
<!-- /ko -->
<!-- /ko -->
</tr>
<!-- /ko -->
原创
对不起,这个令人困惑的问题,但我试图达到二级父级的值,以检查当前上下文中的值(如下所示),如果它与 $parent 的 $parent 值匹配,则仅显示跨度(呃!)
Sorry for the confusing question but I am trying to reach a second level parent's value to check against a value in the current context (like below) to only show a span if it matches a $parent's $parent's value (ugh!)
<!-- ko foreach: grandParent -->
<tr>
<!-- ko foreach: $parent.parents -->
<!-- ko foreach: children -->
<td data-bind="if: favToy().name == $parent.$parent.favToy().name">
<span data-bind="text: favToy().name"></span>
</td>
<!-- /ko -->
<!-- /ko -->
</tr>
<!-- /ko -->
这样做会更容易,但从我读到的内容来看这是不可能的,或者我做错了:)
It would be easier to do it this way but from what I have read this is not possible or I am doing it wrong :)
<!-- ko foreach: grandParent -->
<tr>
<!-- ko foreach: $parent.parents -->
<!-- ko foreach: children ? favToy().name == $parent.$parent.favToy().name -->
<td data-bind="text: favToy().name"></td>
<!-- /ko -->
<!-- /ko -->
</tr>
<!-- /ko -->
任何帮助将不胜感激.
推荐答案
使用 $parents
数组,祖父母将是 $parents[1]
.如果示例中的 grandParent
对象是最顶层的父对象,则您也可以使用 $root
.
Use the $parents
array, the grandparent would be $parents[1]
. You may also be able to use $root
if the grandParent
object in your example is the topmost parent.
来自文档:
$parents
这是一个代表所有父视图模型的数组:
This is an array representing all of the parent view models:
$parents[0] 是来自父上下文的视图模型(即,它是与 $parent 相同)
$parents[0] is the view model from the parent context (i.e., it’s the same as $parent)
$parents[1] 是祖父上下文中的视图模型
$parents[1] is the view model from the grandparent context
$parents[2] 是来自曾祖父母上下文的视图模型
$parents[2] is the view model from the great-grandparent context
……等等.
$root
这是根上下文中的主要视图模型对象,即最顶层的父上下文.它通常是传递给的对象ko.applyBindings.相当于 $parents[$parents.length - 1].
This is the main view model object in the root context, i.e., the topmost parent context. It’s usually the object that was passed to ko.applyBindings. It is equivalent to $parents[$parents.length - 1].
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