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javascript實作淡藍色的滑鼠拖曳選擇框實例_javascript技巧

May 16, 2016 pm 04:00 PM

javascript 選擇框滑鼠拖曳

本文實例講述了javascript實現淡藍色的滑鼠拖曳選擇框。分享給大家供大家參考。具體實作方法如下：

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
&lt;style type="text/css"&gt;
#rectBox
{
background:#CCFFFF;
border:2px solid #0099FF;
filter:alpha(opacity=30);
opacity:0.3;
position:absolute;
}
&lt;/style&gt;
&lt;head&gt;
&lt;title&gt;一个鼠标选择框&lt;/title&gt;
&lt;script type="text/javascript"&gt;
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 &lt; 0)
{
rectSelf.rectBox.style.left = currentX + 'px';
}
if(currentY - rectSelf.startY &lt; 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);
}
&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;h1&gt;拖动你的鼠标就会出现选择框&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;

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