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
- 超级ASP版DataGrid：SkyGrid本地下载
- 用QuickWAP组件结合ASP建设Wap站点
- ASP中取得图片宽度和高度的类（无组件）
- 在ASP处理程序时显示进度
- 结合FSO操作和Aspjpeg组件写的Class
- asp实现的7xi音乐网的采集源代码
- 用asp+xmlhttp编写web采集程序
- 推荐ASP超速入门视频教程
- 关于“未指定的错误”的问题 的比较正解的解决方法
- 用asp脚本实现限制IP访问
- aspupload 3.0 下载与使用集锦
- [教程+分享]具有良好体验度的Web注册系统
- asp 实现视频显示的效果函数
- asp实现图片右键滑轮控制大小的函数
- 彻底掌握ASP分页技术杂谈
- aspupload文件重命名及上传进度条的解决方法附代码
- ASPJPEG综合操作的CLASS类
- asp通用采集函数冗余版可以保存文件到本地
- 使用ODBC数据库管理Serv-U的FTP用户及相关ASP编程[附源码示例下载]
- [asp]阿里西西的alexa采集效果代码
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: 261 ::
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
