所以jQuery引入了jQuery.event.handlers用来区分普通事件与委托事件,形成一个有队列关系的组装事件处理包{elem, handlerObjs}的队列 在最开始引入add方法中增加delegateCount用来记录是否委托数,通过传入的selector判断,此刻就能派上用场了 先判断下是否要处理委托,找到委托的句柄 根据之前的测试demo, 在元素DIV下面嵌套了...
jQuery.event.add( this, types, fn, data, selector ); ... } }) */ add:function( elem, types, handler, data, selector ) {varhandleObjIn, eventHandle, tmp, events, t, handleObj, special, handlers, type, namespaces, origType, /* 获取绑定在elem上的data缓存 */elemData=data_priv.get(...
var event = jQuery.event.fix( nativeEvent ); console.log(event,'event5479') var i, j, ret, matched, handleObj, handlerQueue, args = new Array( arguments.length ), //获取click事件的处理程序集合,结构如下: //[ // {type: "click", origType: "click", data: undefined, handler: ƒ, ...
一般来说,可以直接封装成这种形式: var addEvent = function(element,type,handler){ if(element.addEventListener...){ //DOM2级 element.addEventListener(type,handler,false); //false为冒泡,true为捕获...的使用方式:主要是DOM2级 target.addEventListener(type, listener, useCapture); target就是要注册事件的...
jQuery.event.handlers先将委托事件处理取出来放在处理队列handlerQueue中。 先取出事件源cur = event.target;然后在确定有委托处理的情况下从事件源开始往他的祖先节点查询,直到this节点以下,遍历事件源到this节点(不包含this节点)的每个节点,在遍历中二次遍历委托事件列表中的每一个委托事件处理所指定的响应节点(委托...
jQuery.event.trigger 其实trigger 和 add + handler 函数很类似,大致都是从 data cache 中搜索缓存,执行回调函数。需要考虑要不要执行默认事件,即第四个参数为 true 的情况。 jQuery.extend(jQuery.event, { // onleyHandlers 表示不考虑冒泡事件 trigger: function( event, data, elem, onlyHandlers ) { ...
a hide/show event trigger based on Glenns ideea: removed toggle because it fires show/hide and we don't want 2fires for one event $(function(){ $.each(["show","hide", "toggleClass", "addClass", "removeClass"], function(){ var _oldFn = $.fn[this]; $.fn[this] = function(...
addHandler(btn,"click",handler); EventUtil.removeHandler(btn,"click",handler); //需要注意的是IE的detachEvent和addEvent的作用域是window而不是触发的事件的元素 //并且DOM0级对每个事件只支持一个事件处理程序 var div = document.getElementById('div'); div.onclick = function() { console.log('...
* Props to Dean Edwards' addEvent library for many of the ideas. */jQuery.event={global:{},//源码5241行//this, types, fn, data, selectoradd:function(elem,types,handler,data,selector){varhandleObjIn,eventHandle,tmp,events,t,handleObj,special,handlers,type,namespaces,origType,//elemData正是...
This button already contains a onclick event handler. What I m trying to achieve here is to be able compose the onclick event handler for same the button. I would like to add second method that tracks how many times the button was hit. some approaches: First: Append another function call...