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可拖曳

leader 2022年03月15日 编程设计 149 0
<!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> 
<title>简单实用的可拖曳窗口</title> 
<meta http-equiv="content-type" content="text/html;charset=gb2312"> 
<script type="text/javascript" src="/ajaxjs/jquery-1.6.2.min.js"></script> 
<script type="text/javascript"> 
$(function(){ 
//样式 
$("#drag").css({"position":"absolute","top":"100px","left":"100px","border":"1px solid #789","width":"150px","height":"90px","background":"#988f82","cursor":"move"}) 
    /*+++++ 拖曳效果 ++++++ 
    *原理:标记拖曳状态dragging,坐标位置iX、iY 
    *   mousedown:fn(){dragging = true:记录起始坐标位置,设置鼠标捕获} 
    *   mouseover:fn(){判断如果dragging = true,则当前坐标位置 - 记录起始坐标位置,绝对定位的元素获得差值} 
    *   mouseup:fn(){dragging = false:释放鼠标捕获,防止冒泡} 
    */ 
    var dragging = false; 
    var iX, iY; 
    $("#drag").mousedown(function(e) { 
        dragging = true; 
        iX = e.clientX - this.offsetLeft; 
        iY = e.clientY - this.offsetTop; 
        this.setCapture && this.setCapture(); 
        return false; 
    }); 
    document.onmousemove = function(e) { 
        if (dragging) { 
            var e = e || window.event; 
            var oX = e.clientX - iX; 
            var oY = e.clientY - iY; 
            $("#drag").css({"left":oX + "px", "top":oY + "px"}); 
            return false; 
        } 
    }; 
    $(document).mouseup(function(e) { 
        dragging = false; 
        $("#drag")[0].releaseCapture(); 
        e.cancelBubble = true; 
    }) 
}) 
</script> 
</head> 
<body> 
<div id="drag"></div> 
</body> 
</html>

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