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window.alert效果 修复select bug

代码如下：

<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>你可以拖动我吗？</title>
<script language="javascript">
<!--
function cry(){
alert("你可以拖动我吗？")
}
//-->
</script>

<script language="javascript">

<!--
window.alert = function(txt)
{ 
    //document.all.disabled="true";
    var shield = document.createElement("DIV");
    shield.id = "shield";
    shield.style.position = "absolute";
    shield.style.left = "0px";
    shield.style.top = "0px";
    shield.style.width = "100%";
    shield.style.height = "100%";
    //shield.style.height = document.body.scrollHeight+"px";
    shield.style.background = "#000";
    shield.style.textAlign = "center";
    shield.style.zIndex = "10000";
    shield.style.filter = "alpha(opacity=0)";

    var alertFram = document.createElement("DIV");
    alertFram.id="alertFram";
    alertFram.style.position = "absolute";
    //负边界居中法,相对于shield层的顶部时
    
    //alertFram.style.left = "50%";
    //alertFram.style.top = "50%";
    //alertFram.style.marginLeft = "-125px";
    //alertFram.style.marginTop = "-75px";
    
    //负边界居中法,相对于shield层的底部时
    alertFram.style.right = "50%";
    alertFram.style.bottom = "50%";
    alertFram.style.marginRight = "-125px";
    alertFram.style.marginBottom = "-75px";
    
    alertFram.style.width = "250px";
    alertFram.style.height = "150px";
    alertFram.style.background = "#000";
    alertFram.style.textAlign = "center";
    alertFram.style.lineHeight = "150px";
    alertFram.style.zIndex = "10002";
    strHtml = "<ul style=\"list-style:none;margin:0px;padding:0px;width:100%\">\n";
    strHtml += "<li onmousedown=\"oMove(parentNode.parentNode);\" title=\"移動\" style=\"cursor:move;background:#002F9C;text-align:left;padding-left:5px;font-size:14px;font-weight:bold;color: #FFFFFF;height:25px;line-height:25px;border-left:1px solid #FFFFFF;border-top:1px solid #FFFFFF;border-right:1px solid #FFFFFF;\">[提示……]</li>\n";
    strHtml += "<li style=\"background:#5A7EDC;text-align:center;font-size:12px;color: #FFFFFF;height:120px;line-height:120px;border-left:1px solid #FFFFFF;border-right:1px solid #FFFFFF;\">"+txt+"</li>\n";
    strHtml += "<li style=\"background:#002F9C;text-align:center;font-weight:bold;height:25px;line-height:25px; border-left:1px solid #FFFFFF;border-bottom:1px solid #FFFFFF;border-right:1px solid #FFFFFF;\"><input type=button value=' 确定 ' onclick=\"remove()\"></li>\n";
    strHtml += "</ul>\n";
    alertFram.innerHTML = strHtml;
    document.body.appendChild(alertFram);
    document.body.appendChild(shield);
    fixSelectBug(false);
    var c = 0;
    this.doAlpha = function(){
        if (c++ > 50){clearInterval(ad);return 0;}
        shield.style.filter = "alpha(opacity="+c+");";
    }
    this.remove=function(){
        fixSelectBug(true);
        alertFram.innerHTML="";
        shield.style.filter = "";
        shield.id = "";
        shield.style.position = "";
        shield.style.left = "";
        shield.style.top = "";
        shield.style.width = "";
        shield.style.height ="";
        shield.style.background = "";
        shield.style.textAlign = "";
        shield.style.zIndex = "";
        shield.style.filter = "";
        alertFram.id="";
        alertFram.style.position = "";
        alertFram.style.left = "";
        alertFram.style.top = "";
        alertFram.style.marginLeft = "";
        alertFram.style.marginTop = "";
        alertFram.style.width = "";
        alertFram.style.height = "";
        alertFram.style.background = "";
        alertFram.style.textAlign = "";
        alertFram.style.lineHeight = "";
        alertFram.style.zIndex = "";
    }

var ad = setInterval("doAlpha()",10);
    alertFram.focus();
    document.body.onselectstart = function(){return false;};
}
function oMove(obj){
    var otop,oleft;
    otop = event.y - obj.offsetTop;
    oleft = event.x - obj.offsetLeft;
    obj.setCapture();
    obj.onmousemove = function()
    {
        obj.style.left = event.x - oleft;
        obj.style.top = event.y - otop;
    }
    obj.onmouseup = function()
    {
        obj.onmousemove = null;
        obj.style.filter = null;
        obj.releaseCapture();
    }
}
    var fixSelectBug = function ( viewSelect )
    {try{
            var selects = document.getElementsByTagName("select");
            for( var i = 0 ; i < selects.length ; i++ )
            {
                selects[i].style.visibility = (viewSelect ? "visible" : "hidden");
            }
        }catch(exception){
        }
    }


//-->
</script>
</head>

<body style="margin:0;">
<input type=submit name="cry" value="点击我一下下^_^" style="width: 110px; height: 30px" onclick='return cry();'></input>
<select><option>ssss</option></select>
<input type="text">dddd
<input type="checkbox">

</body>

</html>
posted on 2008-03-12 09:11 小超 阅读(574) 评论(0)  编辑  收藏 所属分类: JAVASCRIPT

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