improve_alert.js

使用JSP和Java Bean来构建一个网上书店。本章介绍的例子可以分成两大部分

if(!document.attachEvent)
{
    document.attachEvent = function(){document.addEventListener(arguments[0].substr(2),arguments[1],arguments[2])}
}

document.attachEvent("onmouseover",function(e)
{
    var tip = "";

    if(typeof(event)=="undefined"){
        tip = e.target.getAttribute("tips")
    }else{
        e    = event;
        tip = e.srcElement.tips;
    }

    
    if(typeof(tip)!="undefined"&&tip.length>0)
    {
        var _tips = document.getElementById("myTip");
        
        if(typeof(_tips)=="undefined"||_tips == null)
        {
            _tips        = document.createElement("div");
            _tips.id    = "myTip";
            _tips.style.position        = "absolute";
            _tips.style.width            = "250px";
            _tips.style.borderWidth        = "1px";
            _tips.style.borderStyle        = "solid";
            _tips.style.borderColor        = "gray";
            _tips.style.fontSize        = "9pt";
            _tips.style.backgroundColor    = "#ffffff";
            _tips.style.color            = "#349045";

            
            _tips.style.filter            = "progid:DXImageTransform.Microsoft.Shadow(color=#999999,direction=135,strength=3)";
            _tips.style.padding            = "5px 8px 3px 8px";
            

            document.body.appendChild(_tips);            
            _tips.style.display            = "none";
        }

            _tips.style.display    = "";
            
            _tips.innerHTML        = tip;
            _tips.style.left = document.body.scrollLeft+e.clientX+10; 
            _tips.style.top = document.body.scrollTop+e.clientY+10; 
    }
}
);

document.attachEvent('onmouseout',function(e)
{   
    var _tips = document.getElementById("myTip");
    if(_tips!=null)
    {
        _tips.style.display="none";
    }
}
)