问题
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. :)
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.
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/.
Also, I'm aware that I could write a custom handler...but that seems really unnecessary for what I need.
I just want one event that fires after the template finishes rendering.
回答1:
My colleague actually solved this last night using something we were playing with before I went home.
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.
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 }"
Then "afterRender" works exactly as the name suggests.
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/ (Using object array style ViewModel)
http://jsfiddle.net/farina/QtZm2/1/ (Using function style ViewModel)
I made an example for both ViewModel styles because I sometimes need one or the other.
Thanks for the help Dan!!
回答2:
Is beforeRemove is what you are looking for? I am not sure what behaviour you want to achieve. Please checkout this sample: http://jsfiddle.net/romanych/YWfV8/8/
Is it what you want or not?
来源：https://stackoverflow.com/questions/9306177/knockoutjs-bind-event-after-template-render