Pelaksanaan Javascript kotak pemilihan seret tetikus biru muda contoh

Pelaksanaan Javascript kotak pemilihan seret tetikus biru muda contoh_kemahiran javascript

WBOY

Lepaskan： 2016-05-16 16:00:12

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1125 orang telah melayarinya

Contoh dalam artikel ini menerangkan cara melaksanakan kotak pemilihan seret tetikus biru muda menggunakan javascript. Kongsikan dengan semua orang untuk rujukan anda. Kaedah pelaksanaan khusus adalah seperti berikut:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
#rectBox
{
background:#CCFFFF;
border:2px solid #0099FF;
filter:alpha(opacity=30);
opacity:0.3;
position:absolute;
}
</style>
<head>
<title>一个鼠标选择框</title>
<script type="text/javascript">
function Rect()
{
this.doc = document.documentElement;
if(!this.doc) return;
this.startX = '';
this.startY = '';
this.rect = null;
rectSelf = this;
}
Rect.prototype.down = function(e)
{
var e = e&#63;e:window.event;
rectSelf.startX = e.clientX&#63;e.clientX + document.body.scrollLeft:e.pageX;
rectSelf.startY = e.clientY&#63;e.clientY + document.body.scrollTop:e.pageY;
rectSelf.showRect(true);
}
Rect.prototype.up = function(e)
{
rectSelf.rectBox.style.width = '0px';
rectSelf.rectBox.style.height = '0px';
rectSelf.showRect(false);
}
Rect.prototype.move = function(e)
{
if(rectSelf.rectBox)
{
var currentX = e.clientX&#63;e.clientX + rectSelf.doc.scrollLeft:e.pageX;
var currentY = e.clientY&#63;e.clientY + rectSelf.doc.scrollTop:e.pageY;
rectSelf.rectBox.style.width = Math.abs(currentX - rectSelf.startX) + 'px';
rectSelf.rectBox.style.height = Math.abs(currentY - rectSelf.startY) + 'px';
if(currentX - rectSelf.startX < 0)
{
rectSelf.rectBox.style.left = currentX + 'px';
}
if(currentY - rectSelf.startY < 0)
{
rectSelf.rectBox.style.top = currentY + 'px';
}
//document.title = "left:"+currentX + 'px '+"top:"+currentY + 'px ';
}
}
Rect.prototype.showRect = function(bool)
{
if(bool)
{
if(!this.rectBox)
{
this.rectBox = document.createElement("div");
this.rectBox.id = "rectBox";
document.body.appendChild(this.rectBox);
}
this.rectBox.style.display = "block";
this.rectBox.style.left = this.startX + 'px';
this.rectBox.style.top = this.startY + 'px'; 
this.addEventListener(this.doc , 'mousemove' , this.move);
}
else
{
if(this.rectBox)
{
this.rectBox.style.display = "none";
}
this.removeEventListener(this.doc , 'mousemove' , this.move);
}
}
Rect.prototype.addEventListener = function(o,e,l) 
{
if (o.addEventListener) {
o.addEventListener(e,l,false);
} else if (o.attachEvent) {
o.attachEvent('on'+e,function() {
l(window.event);
});
}
}
Rect.prototype.removeEventListener = function(o,e,l) 
{
if (o.removeEventListener) {
o.removeEventListener(e,l,false);
} else if (o.detachEvent) {
o.detachEvent('on'+e,function() {
l(window.event);
});
}
}
window.onload = function()
{
var oRect = new Rect();
oRect.addEventListener(oRect.doc , 'mousedown' , oRect.down);
oRect.addEventListener(oRect.doc , 'mouseup' , oRect.up);
}
</script>
</head>
<body>
<h1>拖动你的鼠标就会出现选择框</h1>
</body>
</html>

Salin selepas log masuk

Saya harap artikel ini akan membantu reka bentuk pengaturcaraan JavaScript semua orang.