html5拖动事件中的X和Y值在不同浏览器中不一致

在Chrome,Safari和Firefox中查看以下jsfiddle.它应该详细解释我所看到的.

总之,drag和dragend事件要么没有x和y值,要么具有奇怪的x和y值.

(见下面粘贴的代码)
http://jsfiddle.net/CgzV3/10/

这些错误是否在浏览器中？
我们可以期望浏览器最终在drag和dragend事件中具有合理的x和y值吗？
我们可以期待FireFox最终支持offsetX和offsetY以及dragenter / dragleave / dragover / drop事件吗？

谢谢,
内特

HTML：

<aside draggable="true" id="dragme">
    Drag Me
</aside>

<aside droppable="true" id="drophere">
    Drop Here
</aside>

<div id="notes">
    Notes:
    <ul>
        <li>drag: In Chrome the x/y values for drag are reasonable as the drag is happening,but then you get some crazy values in the last drag event when
            the element is dropped.</li>
        <li>drag: In Firefox,there are no x/y values in drag events at all</li>
        <li>drag: In Safari,the x/y values in drag events seem reasonable</li>
        <li>dragend: In Chrome,the x/y values in dragend are just strange.  The screenX/screenY values seem to be almost accurate,except they are offset by the distance from the bottom left corner of the dragged element to the place where the dragged element was grabbed.</li>
        <li>dragend: In Safari,the x/y values in the dragend seem to all be relevant to the outer window,not the iframe (which exists since this is inside jsfiddle.  This is different from the dragstart event,which sets all the x/y values (except for screenX/screenY) relative to the iframe</li>
        <li>dragend: In Firefox,there is only screenX/y,and it seems right.</li>
        <li>dragenter/dragover/dragleave/drop: Seem good in Chrome/Safari/FireFox except that FireFox does not have offsetX/Y values</li>
    </ul>
</div>

JavaScript的：

function setCell(eventType,label,x,y) {
    var row = ['','dragstart','drag','dragend','','dragenter','dragover','dragleave','drop'].indexOf(eventType);
    var cell = ['','client','page','screen','offset'].indexOf(label);
    var val = [x,y].join('/');
    document.getElementsByTagName('table')[0].rows[row].cells[cell].textContent = val; 
}

function setRow(evt) {
    var eventType = evt.type;
    setCell(eventType,evt.clientX,evt.clientY);
    setCell(eventType,evt.pageX,evt.pageY);
    setCell(eventType,evt.screenX,evt.screenY);
    setCell(eventType,'offset',evt.offsetX,evt.offsetY);
}

function dragstart(evt){
    // FF needs this
    evt.dataTransfer.setData("text/plain","asd");
    setRow(evt);
}

function dragover(evt){
    evt.preventDefault();
    if (evt.stopPropagation) evt.stopPropagation();
    setRow(evt);
}

function drop(evt) {
    console.log(evt.stopPropagation);
    if(evt.preventDefault) evt.preventDefault();
    if (evt.stopPropagation) evt.stopPropagation();
    setRow(evt);
}


var dragme = document.getElementById('dragme'); 
dragme.addEventListener('dragstart',dragstart,false); 
dragme.addEventListener('drag',setRow,false); 
dragme.addEventListener('dragend',false); 
drophere.addEventListener('dragenter',false); 
drophere.addEventListener('dragover',dragover,false); 
drophere.addEventListener('dragleave',false); 
drophere.addEventListener('drop',drop,false);

解决方法

截至2016年2月,我在Windows7上的FireFox中的结果不一致.我正在使用拖放来重新定位网页上的控件.它适用于Windows7上的FireFox v42,v43和v44：

问题是dragEnd()：

> event.screenX和event.screenY的值太大. dragStart()值是正确的.其他测试的机器没有这个问题.
> event.clientX和event.clientY始终为0.我相信这对FF来说是正常的.
> event.offsetY不可靠.通常,它是y drop坐标的负值.例如,如果y计算为100,FF将event.offsetY设置为-100.如果我使用 – (event.offsetY)来定位控件,那么它将始终在100到110的范围内.这非常奇怪,但不是很大,因为event.screenX / Y是其中的关键变量.

开发机器是Windows8,它适用于Chrome,FF,IE和Opera.在FF和其他人使用的任何系统上对LXDE进行了成功测试.

它是一个个人项目和Windows 7计算机是我们的媒体服务器,所以周围没什么大不了的,但非常奇怪.

html5拖动事件中的X和Y值在不同浏览器中不一致

解决方法

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