我试图使用本机拖放事件重新排列DOM SVG元素。下面的代码似乎在Firefox中工作(有一些奇怪的图像效果),在Chrome中工作的次数有限(2或3次拖放重新排序工作,然后它似乎挂起),并且在IE中不是很好。我最好的猜测是,有关事件的事情我没有正确想到,有些类型的重置。或者用这种方式使用没有dataTransfer的拖动事件是不正确的。我的目标是在没有库的情况下理解这种类型的函数,但要在最基本的层面上更清楚地了解DOM函数,javascript,HTML和CSS。我可能很容易在该清单的任何地方出错。HTML5使用javascript拖放DOM操作
<!DOCTYPE html>
<html>
<head>
<title>Drag and Drop Experiments</title>
<style>svg { border-width:3px} </style>
</head>
<body>
<div id="main">
<svg id="s1" draggable="yes" width="100" height="100">
<circle cx="50" cy="50" r="30" fill="blue"></circle>
</svg>
<svg id="s2" draggable="yes" width="100" height="100">
<circle cx="50" cy="50" r="30" fill="red"></circle>
</svg>
<svg id="s3" draggable="yes" width="100" height="100">
<circle cx="50" cy="50" r="30" fill="yellow"></circle>
</svg>
</div>
<script type="text/javascript">
var dragSourceElement = null;
var dragTargetElement = null;
function doDragStart(e){
this.style.opacity = "0.4";
this.style.border = "solid";
dragSourceElement = this;
}
function doDragEnter(e){
if(dragSourceElement != this){
this.style.border = "dashed";
}
}
function doDragLeave(e){
if(dragSourceElement != this){
this.style.border = "";
}
}
function doDragOver(e){
if(dragSourceElement != this){
dragTargetElement = this;
e.preventDefault();//to allow a drop?
}
}
function doDragEnd(e){
this.style.border = "";
this.style.opacity = "1.0";
}
function doDragDrop(e){
if(dragSourceElement != dragTargetElement){
dnd_svg(dragSourceElement,dragTargetElement);
}
dragSourceElement.style.border = "";
dragTargetElement.style.border = "";
dragSourceElement.style.opacity = "";
dragSourceElement = null;
dragTargetElement = null;
}
//called after a drag and drop
//to insert svg element c1 before c2 in the DOM
//subtree of the parent of c2, assuming c1 is
//dropped onto c2
function dnd_svg(c1,c2){
var parent_c2 = c2.parentElement;
parent_c2.insertBefore(c1,c2);
}
function addL(n){
n.addEventListener('dragstart',doDragStart,false);
n.addEventListener('dragenter',doDragEnter,false);
n.addEventListener('dragleave',doDragLeave,false);
n.addEventListener('dragover',doDragOver,false);
n.addEventListener('drop',doDragDrop,false);
}
addL(document.getElementById("s1"));
addL(document.getElementById("s2"));
addL(document.getElementById("s3"));
</script>
</body>
</html>
请注意,IE9中的dnd_svg函数中存在javascript错误。 var parent_c2 = c2.parentElement? c2.parentElement:c2.parentNode;为我解决它。请参阅http://jsfiddle.net/nrNSS/。 – stevebot