繁體中文当前位置: 首页 > 图文教程 > 网络编程 > ASP > javascript asp教程第十一课--Application 对象
- ASP
- ASP实例:读取xml文件的程序
- asp实现rar压缩和解压缩源代码
- 关于ASP中脚本执行顺序的讲解
- 用asp程序读取网站的alexa世界排名
- 初学ASP编程易犯的一个错误要注意
- ASP实现SQL语句日期格式的加减运算
- 通过启动脚本来感受ASP的力量
- ASP SCRIPT: 计数器(使用GrapShot组件)
- 学以致用 驳“ASP低能论”
- ASP分页显示Recordset数据
- ASP编程代码：隐藏图片的真实地址
- ASP网站Server object error的解决办法
- 用ASP对网页进行限制性的访问
- 把网页中的电话号码生成图片的ASP程序
- ASP实现文件直接下载
- 用ASP显示ACCESS数据库的的GIF图象
- ASP分页和日期格式化为RFC822格式的办法
- 实例：ASP与ACCESS链接
- ASP程序直接连接MYSQL数据库
- ASP连接MSSQL的错误: 拒绝访问
ASP 中的 javascript asp教程第十一课--Application 对象
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-13 浏览: 104 ::
收藏到网摘: n/a
Overview:
The Application Object represents a collection of ASP pages. The Application object has zero (0) properties, two (2) collections, two (2) methods, and two (2) events.
Get Started:
Below are a couple scripts for lesson11.
<%@LANGUAGE="JavaScript"%> <% //No ASP Here, just a regular HTML Page %> <HTML> <FORM ACTION="script11a.asp" METHOD="Post"> <STRONG>Would you like to chose the official Application color?</STRONG><BR> <SELECT NAME="OfficialColor"> <OPTION>red</OPTION> <OPTION>white</OPTION> <OPTION>blue</OPTION> </SELECT><BR> <INPUT TYPE="Submit" VALUE="Yes, click here"> </FORM> No, <A HREF="script11a.asp">click here</A>. </HTML>
Click Here to run script11.asp in a new window. Below is script11a.asp.
<%@LANGUAGE="JavaScript"%>
<HTML>
<%
Application.Lock()
var OfficialColor = new String( Request.Form("OfficialColor") )
if (OfficialColor=="red") { Application("OfficialColor") = "red" }
if (OfficialColor=="white") { Application("OfficialColor") = "white" }
if (OfficialColor=="blue") { Application("OfficialColor") = "blue" }
if (OfficialColor=="undefined") { //Do nothing. Just leave the color alone. }
Application.Unlock()
%>
<BODY BGCOLOR="<%=Application("OfficialColor")%>">
<STRONG>
The official application color is <%=Application("OfficialColor")%>.<BR>
</STRONG>
</BODY>
</HTML>
Application Collections:
The two collections are Contents and StaticObjects. StaticObjects come in the form of the <OBJECT> flag. That's done in the global.asa that we saw in Lesson 09. I'll demonstrate it again down below.
By contrast, the Contents collection is demonstrated above. It allows you to set and retrieve variables with Application scope. The format for setting an Application variable is
Share the Variable:
One last thought on Application Variables. The application variable is shared by all visitors. Let's say that you and I are on the same ASP web site at the same time. If you set the background color to white in script11.asp, then I will see "white" as the official color if I go directly to script11a.asp. Application Variables are by no means the most efficient means of passing information from one user to another.
No Apartment Model:
You may notice that the example above seems to be inefficient. Why not just directly assign Application("OfficialColor") = Request.Form("OfficialColor")? Because we can't. By design, the newer (and updated) versions of Microsoft server software intentionally do not support Apartment Model Behavior.
Application Methods:
The two Application Methods are Lock() and Unlock(). Lock() blocks all other users from changing the Application variables. Unlock() releases control so that other users can change it. That's important on a larger site where multiple users may be trying to access the same page at the same time.
Application Events:
The two Application events are Application_OnStart() and Application_OnEnd(). These events are accessed in the global.asa. Let's repeat that script from lesson 09.
<OBJECT RUNAT=Server SCOPE=Session ID=MyInfo PROGID="MSWC.MyInfo">
</OBJECT>
<SCRIPT RUNAT="Server" LANGUAGE="JavaScript">
function Application_OnStart() { Application("someVariableName")="some value" }
function Application_OnEnd() { Application.Contents.RemoveAll() }
function Session_OnStart() { Session.Timeout=15 }
function Session_OnEnd() { //Do Nothing }
</SCRIPT>
<!-- METADATA TYPE="typelib"
FILE="C:\Program Files\Common Files\System\ado\msado15.dll"
-->
Misc. Items:
Application.Contents has two methods of its own.
You'll notice there are also Session Events in the global.asa. We'll deal with those in Lesson 12. You'll also notice a call to the ADO Library. We'll talk about that when we get to databases.
评论 (0) All
