模板渲染后的KnockoutJS绑定事件 [英] KnockoutJS bind event after template render

问题描述

我已经搜索了一段时间，我非常有信心这是一个新问题，而不是标题所暗示的重复. :)

I've been searching for a while, and I'm pretty confident this is a new question, and not a repeat like the title suggests. :)

基本上，我正在尝试确定在使用jQuery模板之类的模板渲染后，KnockoutJS是否创建了一个可订阅事件.

Basically, I'm trying to find out if there is a subscribe-able event that KnockoutJS creates after a template render when using something like jQuery templates.

我将使用内置的"afterRender"，但是我发现，如果清除了可观察数组，则不会触发.我构建了这个演示来说明该问题: http://jsfiddle.net/farina/YWfV8/1/.

I'd use the built-in "afterRender" but I found out that it doesn't fire if the observable array is cleared. I built this demo to illustrate that problem: http://jsfiddle.net/farina/YWfV8/1/.

此外，我知道我可以编写一个自定义处理程序...但这似乎对我所需要的确实不必要.

Also, I'm aware that I could write a custom handler...but that seems really unnecessary for what I need.

我只希望模板完成渲染后触发一个事件.

I just want one event that fires after the template finishes rendering.

推荐答案

昨天晚上，我的同事实际上使用我们回家之前玩的东西解决了这个问题.

My colleague actually solved this last night using something we were playing with before I went home.

因此带有事件"afterRender"，"afterAdd"和"beforeRemove"的整个问题"是，它们与"foreach"绑定一起的行为不同. KnockoutJS非常好，可以在他们的页面上告诉您，但是无论出于什么原因，直到我在实践中看到它，我才真正陷入沉迷.

So the whole "problem" with the events "afterRender", "afterAdd", and "beforeRemove" is that they act differently in conjunction with a "foreach" binding. KnockoutJS is nice enough to tell you this on their page, but for whatever reason it didn't actually sink in for me until I saw it in practice.

真正有效的方法是取消整个"foreach"绑定，并使用Knockout的本机数据"绑定，如下所示:

What really works is to scrap the whole "foreach" binding and use Knockout's native "data" bind like this:

data-bind="template: { name: 'item-template', data: items, afterRender: caller }"

然后，"afterRender"的工作原理与名称相同.

Then "afterRender" works exactly as the name suggests.

给我的印象是，您不能在没有foreach的情况下迭代集合并呈现新的UI，但是这些示例说明了它确实可以工作.

I was under the impression that you couldn't iterate the collection and render new UI without foreach, but these examples illustrate that it does work.

• http://jsfiddle.net/farina/kuFx2/1/ (使用对象数组样式ViewModel)

• http://jsfiddle.net/farina/kuFx2/1/ (Using object array style ViewModel)

http://jsfiddle.net/farina/QtZm2/1/ (使用函数样式ViewModel)

http://jsfiddle.net/farina/QtZm2/1/ (Using function style ViewModel)

我为两种ViewModel样式都做了一个示例，因为有时我需要其中一种.

I made an example for both ViewModel styles because I sometimes need one or the other.

感谢丹的帮助！

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