最近有一个任务,是实现MSN消息框的功能.
一共做了三个版本:
1、用asp.net实现网页中弹出消息框
这个我采用了一个.NET的第三方控件（这个控件在网上找一下就行）,可是这个控件只能显示在网页区域内，也就是说,它无法真正实现和MSN一样的消息框功能。无柰，只好放弃。不过，如果只需要在网页区域中显示的话，可以采用它.
2、用JAVASCRIPT去实现该功能
这回采用JAVASCRIPT去实现。代码如下：
<SCRIPT language="JavaScript">
<!--
/*
* 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?width:200;
this.height = height?height:120;
this.timeout= 150;
this.speed = 20;
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;
}
/*
* 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; //等于0是马上消失,否则为逐渐消失
}
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.hide();
window.open('http://www.google.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><A href='javascript:void(0)' hidefocus=false id='btCommand'><FONT color=#ff0000>" + this.message + "</FONT></A></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.right;
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)//让消息框消失
{
me.timeout--;
if(me.timeout==0)//当消息框在页面中显示的时间到期时，将消息框隐藏
{
//alert(me.timer);
window.clearInterval(me.timer);
me.hide();
}
}
else
{
me.offset = me.offset + me.step;
}
me.Pop.show(x,y,width,height);
// oPopup.show(100, 100, 180, 25, str);
}
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();
}
}
/*
** 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){}
}
function bb(ini)
{
if(ini<=1)
{
//alert(window.Form1.teTitle.value);
var MSG1 = new CLASS_MSN_MESSAGE(ini,200,120,"<image src='oicq.gif'> 消息提示:",window.Form1.teTitle.value,window.Form1.teShow.value);
MSG1.rect(null,null,null,screen.availHeight); //screen 是任务栏，availHeight代表当前任务栏的高度
//alert(screen.availHeight);
MSG1.speed = 10;
MSG1.step = 5;
//alert(MSG1.top);
//MSG1.hide();
// window.setTimeout('Ktime()',120);
MSG1.show();
}
else if(ini>1)
{
for(i=1;i<=ini;i++)
{
var MSG1 = new CLASS_MSN_MESSAGE(i,200,120,"<image src='oicq.gif'> 消息提示:",window.Form1.teTitle.value,window.Form1.teShow.value);
var popheight;
if(i==1)
popheight=screen.availHeight;
else
popheight=popheight-120;
MSG1.rect(null,null,null,popheight); //screen 是任务栏，availHeight代表当前任务栏的高度
MSG1.speed = 10;
MSG1.step = 5;
//alert(MSG1.top);
//MSG1.hide();
window.setTimeout('Ktime()',1000);
MSG1.show();
}
}
}
function Ktime()
{
window.setTimeout('Ktime()',1000);
}
//同时两个有闪烁，只能用层代替了，不过层不跨框架
//var MSG2 = new CLASS_MSN_MESSAGE("aa",200,120,"短消息提示：","您有2封消息","好的啊");
// MSG2.rect(100,null,null,screen.height);
// MSG2.show();
//-->
</SCRIPT>
<form id="Form1" method="post" runat="server">
<TABLE id="Table2" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 8px" cellSpacing="0"
cellPadding="0" width="100%" border="0">
<TR>
<TD vAlign="top"><asp:panel id="Panel1" runat="server"><FONT face="宋体">
<TABLE id="Table1" style="WIDTH: 783px; HEIGHT: 64px" cellSpacing="0" cellPadding="0" width="783"
border="0">
<TBODY>
<TR>
<TD style="WIDTH: 94px">
<asp:label id="Label3" runat="server">标 题</asp:label></TD>
<TD><INPUT id="teTitle" style="WIDTH: 336px; HEIGHT: 22px" type="text" size="50" value="MSN Message"
runat="server"></TD>
</TR>
<TR>
<TD style="WIDTH: 94px">
<asp:label id="Label1" runat="server">显示文字</asp:label></TD>
<TD><FONT face="宋体"><INPUT id="teShow" style="WIDTH: 336px; HEIGHT: 22px" type="text" size="50" value="请点击查看详细信息!"></FONT></TD>
</TR>
<TR>
<TD style="WIDTH: 94px">
<asp:label id="Label2" runat="server">显示次数</asp:label></TD>
<TD><INPUT id="cou" style="WIDTH: 336px; HEIGHT: 22px" type="text" size="50">
</asp:panel></TD>
</TR>
</TABLE>
</FONT></TD></TR>
<TR>
<TD vAlign="top"><INPUT style="WIDTH: 432px; HEIGHT: 56px" onclick="bb(cou.value)" type="button" value="快按一下吧"></TD>
</TR>
</TBODY></TABLE></form>
这个方法可以实现MSN的功能。但还是有一毛病，就是，不能同时出现两个或以上的消息框，否则刷新将十分严重。这样的话，可该怎么办呢？
最后，我实现没有办法了，我只好用C#来实现这个功能
3、用WINDOW窗体实现MSN消息框功能
这个例子我是照MSDN上的一篇例子做的，我在这里只提供一个网址，因为这个网址包含的范例做的更好一些，我做的拿不出手的程序在这里就不提了
http://www.microsoft.com/china/MSDN/library/netFramework/netframework/WindowsForms.mspx
总结一下：
在这里，我提供了三种方法。各位可因人而宜。不过注意一点的是，如采用第二种方法，就必须将不断闪烁的缺点克服。如果各位高手中有知道如何去掉这个错误的话，请教教小弟！这里不胜感激！
李晓
