本文實例講述了JS實現的自定義網頁拖動類。分享給大家供大家參考,具體如下:
先來看運行效果截圖如下:
在線演示地址如下:
http://demo.VeVB.COm/js/2015/js-zdy-web-drug-pic-style-codes/
具體代碼如下:
<!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"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>自寫的拖動類……</title><script type="text/javascript">var d=document;//給document對象一個通用的事件偵聽方法d.addListener=function(e,f,b){ this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b);}d.removeListener=function(e,f,b){ this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);}function $(){//接收一個id參數,返回帶有startDrag方法的對象 var o=document.getElementById(arguments[0]); o.addListener=function(e,f,b){ this.attachEvent?this.attachEvent('on'+e,f):this.addEventListener(e,f,b); } o.removeListener=function(e,f,b){ this.detachEvent?this.detachEvent('on'+e,f):this.removeEventListener(e,f,b); } o.startDrag=function(obj){//參數obj默認為o本身,可以傳其它參數以確定要移動的對象 var obj=obj?obj:o; var sx,sy; o.style.cursor="move"; o.addListener("mousedown",function(e){ e||event; if(e.button==1||e.button==0){ sx=e.clientX-obj.offsetLeft;sy=e.clientY-obj.offsetTop; d.addListener("mousemove",move,false); d.addListener("mouseup",stopDrag,false); } },false); var stopDrag=function(){ d.removeListener("mousemove",move,false); d.removeListener("mouseup",stopDrag,false); } var move=function(e){ e||event; window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); if(e.preventDefault)e.preventDefault();//這兩句便是解決firefox拖動問題的. with (obj.style){ position="absolute" left=e.clientX-sx+"px"; top=e.clientY-sy+"px"; } } } return o; }window.onload=function(){$("ok").startDrag($("os"))}//本例中拖動ok元素,移動其父元素</script><style type="text/css">*{margin:0;padding:0}#ok{width:215px;height:170px;background:url(images/sample1.gif)}#os{width:400px;height:300px;background:#09f;left:300px}#os2{width:400px;height:300px;background:#f90;}</style></head><body><div id="os"><p id="ok"></p></div><div id="os2"></div></body></html>
希望本文所述對大家JavaScript程序設計有所幫助。
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