在本系列文章的第三篇中,我们已经基本实现了消息提示的要求,也有了一定的灵活性,但是在这个消息提示应用的开发过程中,我的追求是最好能封装出一个C#的类来,这样,其他开发人员如果要实现类似的要求,就可以直接引用我编写的dll文件,然后实例化相应的类,调用相应的方法即可,而不必去复制粘贴那些复杂的JavaScript脚本,也不必去关心它是如何实现的,就像没有利用JavaScript一样。有了这个想法,自然就去寻找解决的办法。后来,我利用嵌入资源和反射技术相结合,解决了这个问题。解决的方法如下:
一、建立一个类库项目,在其中添加一个JavaScript文件(Notice.js),在文件中输入如下代码:
<
SCRIPT language
=
JavaScript
>

/**/
/**/
/**/
/*
** ==================================================================================================
** 类名:CLASS_MSN_MESSAGE
** 功能:提供类似MSN消息框
** ==================================================================================================
**/

/**/
/**/
/**/
/*
* 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;
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();
if(this.target=="blank")

...{
window.open(this.action);
}
if(this.target=="self")

...{
parent.location = this.action;
}
}

/**/
/**/
/**/
/*
* 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=true 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.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();
}
}

/**/
/**/
/**/
/*
** 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)...{}
}
</
SCRIPT
>
将这个文件的属性设置成为“嵌入的资源”。
二、在这个项目中添加一个类,类的代码如下:
using
System;
using
System.Collections.Generic;
using
System.Text;

using
System.IO;
using
System.Reflection;
using
System.Web;
using
System.Web.UI;
using
System.Web.UI.WebControls;

namespace
NoticeClass

...
{

/**//// <summary>
/// 实现类似MSN消息提示
/// </summary>
public class NoticeScript

...{
Page page;
UserControl control;
int winWidth =200 ;
int winHeight = 120 ;
string winCaption = "短消息提示:";
int speed = 10;
int step = 5;

bool isPage;


/**//// <summary>
/// 消息提示窗体宽度
/// </summary>
public int WinWidth

...{

get ...{ return winWidth; }

set ...{ winWidth = value; }
}


/**//// <summary>
/// 消息提示窗体高度
/// </summary>
public int WinHeight

...{

get ...{ return winHeight; }

set ...{ winHeight = value; }
}


/**//// <summary>
/// 消息提示窗体标题
/// </summary>
public string WinCaption

...{

get ...{ return winCaption; }

set ...{ winCaption = value; }
}


/**//// <summary>
/// 消息提示窗体显示的速度
/// </summary>
public int Speed

...{

get ...{ return speed; }

set ...{ speed = value; }
}


/**//// <summary>
/// 消息提示窗体显示时的步长
/// </summary>
public int Step

...{

get ...{ return step; }

set ...{ step = value; }
}


/**//// <summary>
/// 用于显示消息的页面实例
/// </summary>
public Page NoticePage

...{

get ...{ return page; }

set ...{ page = value; }
}


/**//// <summary>
/// 用于 显示消息的用户控件实例
/// </summary>
public UserControl NoticeUserControl

...{

get ...{ return control; }

set...{control = value;}
}


/**//// <summary>
/// 构造函数
/// </summary>
/// <param name="noticePage">显示消息的页面</param>
public NoticeScript(Page noticePage)

...{
this.isPage = true;
this.page = noticePage;
RegScript(noticePage);
}


/**//// <summary>
/// 构造函数
/// </summary>
/// <param name="userControl">显示消息的用户控件</param>
public NoticeScript(UserControl userControl)

...{
this.isPage = false;
this.control = userControl;
RegScript(userControl.Page);
}


/**//// <summary>
/// 显示提示消息
/// </summary>
/// <param name="noticeID">消息提示标识</param>
/// <param name="width">消息提示窗体宽</param>
/// <param name="height">消息提示窗体高</param>
/// <param name="caption">消息提示窗体标题</param>
/// <param name="title">消息标题</param>
/// <param name="message">消息内容</param>
/// <param name="target">链接的打开方式</param>
/// <param name="url">消息内容链接到的地址</param>
public void ShowNotice(string noticeID, int width, int height, string caption, string title, string message,Target target,string url)

...{
if (target == Target.Blank)

...{
Show(noticeID, width, height, caption, title, message, "blank", url);
}
else

...{
Show(noticeID, width, height, caption, title, message, "self", url);
}
}


/**//// <summary>
/// 显示提示消息
/// </summary>
/// <param name="noticeID">消息提示标识</param>
/// <param name="width">消息提示窗体宽</param>
/// <param name="height">消息提示窗体高</param>
/// <param name="caption">消息提示窗体标题</param>
/// <param name="title">消息标题</param>
/// <param name="message">消息内容</param>
public void ShowNotice(string noticeID,int width,int height,string caption,string title,string message)

...{
Show(noticeID, width, height, caption, title, message);
}


/**//// <summary>
/// 显示提示消息
/// </summary>
/// <param name="noticeID">消息提示标识</param>
/// <param name="title">消息标题</param>
/// <param name="message">消息内容</param>
public void ShowNotice(string noticeID, string title, string message)

...{
Show(noticeID, this.winWidth, this.winHeight, this.winCaption, title, message);
}


/**//// <summary>
/// 显示提示消息
/// </summary>
/// <param name="noticeID">消息提示标识</param>
/// <param name="title">消息标题</param>
/// <param name="message">消息内容</param>
/// <param name="target">链接的打开方式</param>
/// <param name="url">消息内容链接到的地址</param>
public void ShowNotice(string noticeID, string title, string message,Target target,string url)

...{
if (target == Target.Blank)

...{
Show(noticeID, this.winWidth, this.winHeight, this.winCaption, title, message, "blank", url);
}
else

...{
Show(noticeID, this.winWidth, this.winHeight, this.winCaption, title, message, "self", url);
}
}

private void Show(string noticeID, int width, int height, string caption, string title, string message)

...{
string alert = "<script>var MSG1 = new CLASS_MSN_MESSAGE("" + noticeID + ""," + width + "," + height + ","" +
caption + "","" + title + "","" + message + "");";
alert += "MSG1.rect(screen.width - 205, null, null, screen.height - 60);";
alert += "MSG1.speed = " + this.speed + ";";
alert += "MSG1.step = " + this.step + ";";
alert += "MSG1.show(); ";
alert += "</script>";

if (isPage)

...{
page.Controls.Add(new LiteralControl(alert));
}
else

...{
control.Controls.Add(new LiteralControl(alert));
}
}

private void Show(string noticeID, int width, int height, string caption, string title, string message,string target,string url)

...{
string alert = "<script>var MSG1 = new CLASS_MSN_MESSAGE("" + noticeID + ""," + width + "," + height + ","" +
caption + "","" + title + "","" + message + "","" + target + "","" + url + "");";
alert += "MSG1.rect(screen.width - 205, null, null, screen.height - 60);";
alert += "MSG1.speed = " + this.speed + ";";
alert += "MSG1.step = " + this.step + ";";
alert += "MSG1.show(); ";
alert += "</script>";

if (isPage)

...{
page.Controls.Add(new LiteralControl(alert));
}
else

...{
control.Controls.Add(new LiteralControl(alert));
}
}

private void RegScript(Page showPage)

...{
string clientScript = "";

Assembly asm = Assembly.GetExecutingAssembly();
string resource = "NoticeClass.Notice.js";
Stream stm = asm.GetManifestResourceStream(resource);

StreamReader reader = new StreamReader(stm);
clientScript = reader.ReadToEnd();
reader.Close();
stm.Close();

if (!showPage.ClientScript.IsClientScriptBlockRegistered(showPage.GetType(), "clientScript"))

...{
showPage.ClientScript.RegisterClientScriptBlock(showPage.GetType(), "clientScript", clientScript);
}
}
}

public enum Target

...{
Blank,
Self
}
}
编译这个类库项目,产生一个dll文件。这样,就完成了该类库的设计。
三、调用方式。在需要提示的asp.net项目中,添加上述dll文件的引用。在要提示的方法或函数中,增加如下代码即可完成提示:
NoticeClass.NoticeScript notice
=
new
NoticeScript(
this
);
notice.ShowNotice(
"
1
"
,
200
,
120
,
"
消息提示:
"
,
"
你有1条消息
"
,
"
欢迎访问小小程序员博客!
"
);

//
也可以选用以下的三个方法,带url参数的可以实现点击消息跳转到相应的url
//
notice.ShowNotice("2", 200, 120, "消息提示:", "你有1条消息", "有欢迎访问小小程序员博客!", Target.Self, "
http://blog.youkuaiyun.com/oneiter
");
//
notice.ShowNotice("3", "你有1条消息", "欢迎访问小小程序员博客!");
//
notice.ShowNotice("4", "你有1条消息", "欢迎访问小小程序员博客!", Target.Blank, "
http://blog.youkuaiyun.com/oneiter
");
这种实现方式在其它资料上讲述较少,所以我的实现方式也只是一个探索,未必成熟,欢迎提出宝贵意见。