右下角自动弹出提示框实现

因为有需求，当有新消息时，需要类似于QQ那样弹出提示框。实现如下：

1、alertMessage.js

/*  
*    消息构造  
*/  
function CLASS_MSN_MESSAGE(id,width,height,caption,title,message,target,action){  
    this.id     = id;  
    this.title  = title;  
    this.caption= caption;  
    this.message= message;  
    this.target = target;  
    this.action = action;  
    this.width    = width?200;  
    this.height = height?height:120;  
    this.timeout= 150;  
    this.speed    = 2000; 
    this.step    = 1; 
    this.right    = screen.width -1;  
    this.bottom = screen.height; 
    this.left    = this.right - this.width; 
    this.top    = this.bottom - this.height; 
    this.timer    = 0; 
    this.pause    = false;
    this.close    = false;
    this.autoHide    = true;
}  
  
/**//*  
*    隐藏消息方法  
*/  
CLASS_MSN_MESSAGE.prototype.hide = function(){  
    if(this.onunload()){  

        var offset  = this.height>this.bottom-this.top?this.height:this.bottom-this.top; 
        var me  = this;  

        if(this.timer>0){   
            window.clearInterval(me.timer);  
        }  

        var fun = function(){  
            if(me.pause==false||me.close){
                var x  = me.left; 
                var y  = 0; 
                var width = me.width; 
                var height = 0; 
                if(me.offset>0){ 
                    height = me.offset; 
                } 
     
                y  = me.bottom - height; 
     
                if(y>=me.bottom){ 
                    window.clearInterval(me.timer);  
                    me.Pop.hide();  
                } else { 
                    me.offset = me.offset - me.step;  
                } 
                me.Pop.show(x,y,width,height);    
            }             
        }  

        this.timer = window.setInterval(fun,this.speed)      
    }  
}  
  
/**//*  
*    消息卸载事件，可以重写  
*/  
CLASS_MSN_MESSAGE.prototype.onunload = function() {  
    return true;  
}  
/**//*  
*    消息命令事件，要实现自己的连接，请重写它  
*  
*/  
CLASS_MSN_MESSAGE.prototype.oncommand = function(){  
    //this.close = true;
    this.hide();  
 window.open("http://www.baidu.com");
   
} 
/**//*  
*    消息显示方法  
*/  
CLASS_MSN_MESSAGE.prototype.show = function(){  

    var oPopup = window.createPopup(); //IE5.5+  
    
    this.Pop = oPopup;  
  
    var w = this.width;  
    var h = this.height;  
  
    var str = "<DIV style='BORDER-RIGHT: #455690 1px solid; BORDER-TOP: #a6b4cf 1px solid; Z-INDEX: 99999; LEFT: 0px; BORDER-LEFT: #a6b4cf 1px solid; WIDTH: " + w + "px; BORDER-BOTTOM: #455690 1px solid; POSITION: absolute; TOP: 0px; HEIGHT: " + h + "px; BACKGROUND-COLOR: #c9d3f3'>"  
        str += "<TABLE style='BORDER-TOP: #ffffff 1px solid; BORDER-LEFT: #ffffff 1px solid' cellSpacing=0 cellPadding=0 width='100%' bgColor=#cfdef4 border=0>"  
        str += "<TR>"  
        str += "<TD style='FONT-SIZE: 12px;COLOR: #0f2c8c' width=30 height=24></TD>"  
        str += "<TD style='PADDING-LEFT: 4px; FONT-WEIGHT: normal; FONT-SIZE: 12px; COLOR: #1f336b; PADDING-TOP: 4px' vAlign=center width='100%'>" + this.caption + "</TD>"  
        str += "<TD style='PADDING-RIGHT: 2px; PADDING-TOP: 2px' vAlign=center align=right width=19>"  
        str += "<SPAN title=关闭 style='FONT-WEIGHT: bold; FONT-SIZE: 12px; CURSOR: hand; COLOR: red; MARGIN-RIGHT: 4px' id='btSysClose' >×</SPAN></TD>"  
        str += "</TR>"  
        str += "<TR>"  
        str += "<TD style='PADDING-RIGHT: 1px;PADDING-BOTTOM: 1px' colSpan=3 height=" + (h-28) + ">"  
        str += "<DIV style='BORDER-RIGHT: #b9c9ef 1px solid; PADDING-RIGHT: 8px; BORDER-TOP: #728eb8 1px solid; PADDING-LEFT: 8px; FONT-SIZE: 12px; PADDING-BOTTOM: 8px; BORDER-LEFT: #728eb8 1px solid; WIDTH: 100%; COLOR: #1f336b; PADDING-TOP: 8px; BORDER-BOTTOM: #b9c9ef 1px solid; HEIGHT: 100%'>" + this.title + "<BR><BR>"  
        str += "<DIV style='WORD-BREAK: break-all' align=left>&nbsp;&nbsp;"+this.message+"</DIV>"  
        str += "</DIV>"  
        str += "</TD>"  
        str += "</TR>"  
        str += "</TABLE>"  
        str += "</DIV>"  
  
    oPopup.document.body.innerHTML = str; 
    
  
    this.offset  = 0; 
    var me  = this;  

    oPopup.document.body.onmouseover = function(){me.pause=true;}
    oPopup.document.body.onmouseout = function(){me.pause=false;}

    var fun = function(){  
        var x  = me.left; 
        var y  = 0; 
        var width    = me.width; 
        var height    = me.height; 

            if(me.offset>me.height){ 
                height = me.height; 
            } else { 
                height = me.offset; 
            } 

        y  = me.bottom - me.offset; 
        if(y<=me.top){ 
            me.timeout--; 
            if(me.timeout==0){ 
                window.clearInterval(me.timer);  
                if(me.autoHide){
                    me.hide(); 
                }
            } 
        } else { 
            me.offset = me.offset + me.step; 
        } 
        me.Pop.show(x,y,width,height);    

    }  
  
    this.timer = window.setInterval(fun,this.speed)      
  
     
  
    var btClose = oPopup.document.getElementById("btSysClose");  
  
    btClose.onclick = function(){  
        me.close = true;
        me.hide();  
    }  
/*
    var btCommand = oPopup.document.getElementById("btCommand");  
    btCommand.onclick = function(){  
        me.oncommand();  
    }

// 链接中必须有一个id='messageId'
  var ommand = oPopup.document.getElementById("messageId");  
      ommand.onclick = function(){
        me.hide();  
         window.open(ommand.href);
    }
*/
}  

/**//* 
** 设置速度方法 
**/ 
CLASS_MSN_MESSAGE.prototype.speed = function(s){ 
    var t = 20; 
    try { 
        t = praseInt(s); 
    } catch(e){} 
    this.speed = t; 
} 
/**//* 
** 设置步长方法 
**/ 
CLASS_MSN_MESSAGE.prototype.step = function(s){ 
    var t = 1; 
    try { 
        t = praseInt(s); 
    } catch(e){} 
    this.step = t; 
} 
  
CLASS_MSN_MESSAGE.prototype.rect = function(left,right,top,bottom){ 
    try { 
        this.left        = left    !=null?left:this.right-this.width; 
        this.right        = right    !=null?right:this.left +this.width; 
        this.bottom        = bottom!=null?(bottom>screen.height?screen.height:bottom):screen.height; 
        this.top        = top    !=null?top:this.bottom - this.height; 
    } catch(e){} 
} 

2、调用 放在公共页面上index.jsp

<script src="../js/alertMessage.js" type=text/javascript></script>
<script type=text/javascript>
// 自动检查新代办的时间
var validatePendingCountTime = getValidatePendingCountTime();
// 多久刷新一次页面
window.setTimeout('showPendingMessage()',validatePendingCountTime); 
function showPendingMessage()
{
    var url = "pendingTaskAjaxController.do"; 
    Ajax.load(url,function(data){
        // 是否有新的待办
        var flag =data.flag;
        // 是否有提示内容信息
        var messageContent =data.messageContent;
        if (flag && messageContent != "")
        {
            var MSG1 = new CLASS_MSN_MESSAGE("pendingMessage",200,120,"尊敬的 <c:out value='${userInfo.userName }' /> ：", "您有待处理的待办事宜", messageContent);  
            MSG1.rect(null,null,null,screen.height-50); 
            MSG1.speed = 10; 
            MSG1.step = 5; 
            MSG1.autoHide = false; // 不自动隐藏
            MSG1.show(); 
        }
    });

   window.setTimeout('showPendingMessage()',validatePendingCountTime); 
}
// 获取刷新时间
function getValidatePendingCountTime()
{
    try
    {
        // validatePendingCountTime 保存在session中
        validatePendingCountTime = parseInt("<c:out value='${validatePendingCountTime }' />");
    }
    catch(e)
    {
        validatePendingCountTime = 5;
    }
    validatePendingCountTime = validatePendingCountTime*60*1000;
    return validatePendingCountTime;
}
</script>