Heim > Artikel > Web-Frontend > javascript实现淡蓝色的鼠标拖动选择框实例_javascript技巧
javascript实现淡蓝色的鼠标拖动选择框实例_javascript技巧
- WBOYOriginal
- 2016-05-16 16:00:121046Durchsuche
本文实例讲述了javascript实现淡蓝色的鼠标拖动选择框。分享给大家供大家参考。具体实现方法如下：
<!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?e:window.event;
rectSelf.startX = e.clientX?e.clientX + document.body.scrollLeft:e.pageX;
rectSelf.startY = e.clientY?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?e.clientX + rectSelf.doc.scrollLeft:e.pageX;
var currentY = e.clientY?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>
希望本文所述对大家的javascript程序设计有所帮助。
Stellungnahme：
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn
Vorheriger Artikel：jQuery实现的多屏图像图层切换效果实例_jqueryNächster Artikel：jquery实现图片左右切换的方法_jquery