javascript - Onmouseover child div 问题和事件冒泡

Question

我有一个小 div 位于(悬停)一个大 div 之上。
我将 onmouseover 和 onmouseout 事件分配给包装器 div。
用于图像标题翻转动画。

问题是当鼠标位于标题本身之上时，会导致不想要的结果(可能是事件冒泡)。

另一个问题:有时当您将鼠标从外部移动到容器时，您会得到一个三重序列:(它应该只是 2):

-我已经结束了-
-我出去了-
-我已经结束了-

如何让它发挥作用？ (无 jQuery)
必须适用于所有浏览器。

Demo

我添加了firebug控制台日志，以更好地调试。

更新:
我已在 RollOverDescription 中添加了此内容(不在在线演示中):

if (!eventHandle) var eventHandle = window.event;               
var srcEle = eventHandle.srcElement.id;             
if(srcEle=="imageDescription" ){
    return;
}

但这并没有帮助。

Answer 1

This article在 quirksmode(靠近底部)上有对您所经历的情况的解释以及可能对您有帮助的脚本。还有很多关于鼠标事件的跨浏览器信息

好的，这是一些工作代码。我不保证这是最有效的或者它不会导致 IE 中的内存泄漏(或者它在 IE 中有效 - 请让我知道)。这就是人们使用图书馆的原因，更安全、更容易。

// a general purpose, cross browser event adder
// returns a function that if run removes the event
function addEvent( el, eventType, handler, capturing ) {
    if( el.addEventListener ) {
        el.addEventListener( eventType, handler, capturing || false );
        var removeEvent = function() { el.removeEventListener( eventType, handler, capturing || false ) };
    } else if( el.attachEvent ) {
        var fn = function() {
            handler.call( el, normalise( window.event ) );
        };
        el.attachEvent( 'on'+eventType, fn );
        var removeEvent = function(){ el.detachEvent( 'on'+eventType, fn ) };
    }
    function normalise( e ) {
        e.target = e.srcElement;
        e.relatedTarget = e.toElement;

        e.preventDefault = function(){ e.returnValue = false };
        e.stopPropagation = function(){ e.cancelBubble = true };
        return e;
    };
    return removeEvent;
};



// adds mouseover and mouseout event handlers to a dom element
// mouseover and out events on child elements are ignored by this element
// returns a function that when run removes the events
// you need to send in both handlers - an empty function will do
function addMouseOverOutEvents( element, overHandler, outHandler ) {

    function out( e ) {
        var fromEl = e.target;
        var toEl = e.relatedTarget;
        // if the mouseout didn't originate at our element we can ignore it
        if( fromEl != element ) return;
        // if the element we rolled onto is a child of our element we can ignore it
        while( toEl  ) {
            toEl = toEl.parentNode;
            if( toEl == element ) return;
        }
        outHandler.call( element, e );
    }

    function over( e ) {
        var toEl = e.target;
        var fromEl = e.relatedTarget;
        // if the mouseover didn't originate at our element we can ignore it
        if( toEl != element ) return;
        // if the element we rolled from is a child of our element we can ignore it
        while( fromEl  ) {
            fromEl = fromEl.parentNode;
            if( fromEl == element ) return;
        }
        overHandler.call( element, e );
    }

    var killers = [];
    killers.push( addEvent( element, 'mouseover', over ) );
    killers.push( addEvent( element, 'mouseout', out ) );
    return function() {
        killers[0]();
        killers[1]();
    }
}

使用示例:

// add the events
var remover = addMouseOverOutEvents(
    document.getElementById( 'elementId' ),
    function( e ) {
        this.style.background = 'red';
        console.log( 'rolled in: '+e.target.id );
    },
    function( e ) {
        this.style.background = 'blue'
        console.log( 'rolled out: '+e.target.id );
    }    
);

//remove the events
remover();