JS中使用DOM-Drag捕捉组件位置坐标
JS中使用DOM-Drag捕捉组件位置坐标
1.使用Drag.init设置被拖放的组件；
2.调用组件的onDrag、onDragStart、onDragEnd方法分别取得组件拖放过程中、开始拖放时、结束拖放时的位置坐标。
DOMDragEx7.html:
程序代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>DOM-Drag ex7</title>
<script type="text/javascript" src="js/dom-drag.js"></script>
<script type="text/javascript" src="js/DOMDragEx7.js"></script>
<style type="text/css">
#box {
position:absolute;
width:400px;
height:400px;
border:#000000 1px dashed;
}
#msg1 {
margin-top:200px;
margin-left:420px;
}
#msg2 {
margin-top:10px;
margin-left:420px;
width:260px;
}
</style>
</head>
<body>
<div id="box" style="top:20px;left:20px;">
<img id="b" src="images/b.gif" style="position:absolute; top:50px; left:50px;" />
<img id="g" src="images/g.gif" style="position:absolute; top:200px; left:70px;" />
<img id="p" src="images/p.gif" style="position:absolute; top:300px; left:350px;" />
</div>
<textarea id="msg1" rows="10" cols="30" readonly="readonly"></textarea>
<form action="">
<input id="msg2" readonly="readonly" />
</form>
</body>
</html>
DOMDragEx7.js:
程序代码
window.onload = function() {
var b = document.getElementById("b");
var g = document.getElementById("g");
var p = document.getElementById("p");
var msg1 = document.getElementById("msg1");
var msg2 = document.getElementById("msg2");
Drag.init(b);
Drag.init(g);
Drag.init(p, null, 0, 374, 0, 374);
b.onDragStart = function(x, y) {
reportDragStart("black", x, y);
}
g.onDragStart = function(x, y) {
reportDragStart("green", x, y);
}
p.onDragStart = function(x, y) {
reportDragStart("purple", x, y);
}
b.onDragEnd = function(x, y) {
reportDragEnd("black", x, y);
}
g.onDragEnd = function(x, y) {
reportDragEnd("green", x, y);
}
p.onDragEnd = function(x, y) {
reportDragEnd("purple", x, y);
}
b.onDrag = function(x, y) {
reportDrag("black", x, y);
}
g.onDrag = function(x, y) {
reportDrag("green", x, y);
}
p.onDrag = function(x, y) {
reportDrag("purple", x, y);
}
function reportDragStart(name, x, y) {
msg1.value += name + ": onDragStart (" + x + "," + y + ")\n";
}
function reportDragEnd(name, x, y) {
msg1.value += name + ": onDragEnd (" + x + "," + y + ")\n";
}
function reportDrag(name, x, y) {
msg2.value = name + ": onDrag (" + x + "," + y + ")\n";
}
}
1.使用Drag.init设置被拖放的组件；
2.调用组件的onDrag、onDragStart、onDragEnd方法分别取得组件拖放过程中、开始拖放时、结束拖放时的位置坐标。
DOMDragEx7.html:
程序代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>DOM-Drag ex7</title>
<script type="text/javascript" src="js/dom-drag.js"></script>
<script type="text/javascript" src="js/DOMDragEx7.js"></script>
<style type="text/css">
#box {
position:absolute;
width:400px;
height:400px;
border:#000000 1px dashed;
}
#msg1 {
margin-top:200px;
margin-left:420px;
}
#msg2 {
margin-top:10px;
margin-left:420px;
width:260px;
}
</style>
</head>
<body>
<div id="box" style="top:20px;left:20px;">
<img id="b" src="images/b.gif" style="position:absolute; top:50px; left:50px;" />
<img id="g" src="images/g.gif" style="position:absolute; top:200px; left:70px;" />
<img id="p" src="images/p.gif" style="position:absolute; top:300px; left:350px;" />
</div>
<textarea id="msg1" rows="10" cols="30" readonly="readonly"></textarea>
<form action="">
<input id="msg2" readonly="readonly" />
</form>
</body>
</html>
DOMDragEx7.js:
程序代码
window.onload = function() {
var b = document.getElementById("b");
var g = document.getElementById("g");
var p = document.getElementById("p");
var msg1 = document.getElementById("msg1");
var msg2 = document.getElementById("msg2");
Drag.init(b);
Drag.init(g);
Drag.init(p, null, 0, 374, 0, 374);
b.onDragStart = function(x, y) {
reportDragStart("black", x, y);
}
g.onDragStart = function(x, y) {
reportDragStart("green", x, y);
}
p.onDragStart = function(x, y) {
reportDragStart("purple", x, y);
}
b.onDragEnd = function(x, y) {
reportDragEnd("black", x, y);
}
g.onDragEnd = function(x, y) {
reportDragEnd("green", x, y);
}
p.onDragEnd = function(x, y) {
reportDragEnd("purple", x, y);
}
b.onDrag = function(x, y) {
reportDrag("black", x, y);
}
g.onDrag = function(x, y) {
reportDrag("green", x, y);
}
p.onDrag = function(x, y) {
reportDrag("purple", x, y);
}
function reportDragStart(name, x, y) {
msg1.value += name + ": onDragStart (" + x + "," + y + ")\n";
}
function reportDragEnd(name, x, y) {
msg1.value += name + ": onDragEnd (" + x + "," + y + ")\n";
}
function reportDrag(name, x, y) {
msg2.value = name + ": onDrag (" + x + "," + y + ")\n";
}
}