我想知道jquery的委托或代理(代表)如何工作 [英] i want to know how jquery' delegate or on(for delegate) works

查看:131
本文介绍了我想知道jquery的委托或代理(代表)如何工作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

有时我使用来委托事件,

sometimes i use on to delegate event ,

dom.addEventListener("click",function(e){
  e.target for hander.
}
instead:
dom.on("click",'a',function(){
  $(this).handler..
}

我想我可以这样编写代码:

so,i guess i can write codes in this way :

function delegate(dom,event,selector,handler){
   target = event.target;
   while selector.dom.not_match event.target
       target = target.parentNode
       recheck until match the selector and do handler;
   end
}

我以前写过:

function delegate(dom,event,selector,handler){
    dom.addEvent event function(){
      target_arr = dom.find(selector);
      if(event.target in_array target_arr){
        do handler
      }else{
         target = target.parentNode until dom.
         recheck in target_arr;
      }
    }

}

有人知道jquery的工作方法代理或开代表委托?请给我代码简单的代理的描述..谢谢alot。

someone know how jquery's work method on 'delegate' or 'on' for delegate?please show me the code simply description for 'delegate'..thanks alot.

推荐答案

p>查看 jQuery文档 on( ) ,他们非常好地解释了这个概念。

Have a look at the jQuery docs for on(), they explain the concept very well.

另外,你可以看看源代码

经验教训:


  • 委托 只是一个包含上的不同参数的包装订单

  • on 只是一些参数归一化并处理一个,然后委托给 jQuery.event.add(this,types,fn,data,selector);

  • event.add 做了大量的验证,处理多种类型和特殊情况,推送 $。data(events)上的参数, 并调用 elem.addEventListener(type,jQuery.event.dispatch,false)

  • event.dispatch 然后从 $。data(events)再次查询句柄,并构建一个 jqEvent 。然后,它开始搜索委派事件 - 该代码是非常简单的,并将它们推送到 handlerQueue 之后,直接附加在元素上的普通处理程序。最后,它只是运行 handlerQueue ,从委托处理程序开始。

  • delegate is just a wrapper for on with different parameter order
  • on does just some parameter normalisation and handles one, but delegates then to jQuery.event.add( this, types, fn, data, selector );
  • event.add does do a lot of validation, handles multiple types and special cases, pushes the arguments on $.data("events") and calls elem.addEventListener(type, jQuery.event.dispatch, false)
  • event.dispatch then queries the handles from $.data("events") again and builds a jqEvent from the native event. Then it begins searching for delegated events - the code for that is quite straightforward - and pushes them on the handlerQueue, after that the normal handlers which are attached directly on the element. In the end, it just runs the handlerQueue, starting with the delegated handlers.

这篇关于我想知道jquery的委托或代理(代表)如何工作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆