繁體中文当前位置: 首页 > 图文教程 > 网络编程 > ASP > javascript asp教程第八课--request对象
- ASP
- 论坛树状记录表的堆栈展开
- Oracle大文本在ASP中存取问题的解决
- ASP创建SQL Server数据库的两种方法
- 浅谈session_onend的调试
- 用ASP访问数据库的几种常见方式
- 教你一次下载网页中的所有资源
- 20种看asp源码的方法及工具
- 在ASP中使用智岛网格控件全过程
- 解决使用ASP无法连接ORACLE 9i数据库的问题
- 用Js判断输入的时间是否有效
- ADO数据与XML数据间的转换的类
- 使用命名管道访问SQL Server
- 网页加速之网页结构篇
- 在红蜻蜓中实现多房间
- 在ASP中使用Oracle数据库技巧
- 关于分页办法
- 在VB中使用API函数(Any)
- 网站ASP漏洞小总结
- 网页之定时器详解
- 实用函数- 判断输入的是否是电话号码
ASP 中的 javascript asp教程第八课--request对象
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-13 浏览: 215 ::
收藏到网摘: n/a
Request Object:
Request has five (5) Collections, one (1) Property, and one (1) Method. You'll use the Collections far more than the property or the method.
Request Collections:
Below is a table of the Request Collections and descriptions of how they are used.
| ClientCertificate | Request.ClientCertificate("Key[Field]") Client security info for SSL encryption |
| Cookies | Request.Cookies("cookieName") Holds cookie value stored on the client |
| Form | Request.Form("formName") Holds value sent via HTML Form |
| QueryString | Request.QueryString("keyName") Name/Value pair appended to the end of the URL |
| ServerVariables | Request.ServerVariables("variableName") Hold values sent in the HTTP Headers |
ClientCertificate:
Request.ClientCertificate is used with S.S.L. (Secure Sockets Layer). It is beyond the scope of this web site.
Cookies:
We will learn Request.Cookies and Response.Cookies together in Lesson 08. Please be patient.
Form:
Request.Form is probably the workhorse of the Request Collections. The first script is a repeat from Lesson 03.
<%@LANGUAGE="JavaScript"%> <% //No ASP Here, just a regular HTML Page %> <HTML> <STRONG>Type something into the text box and submit it.</STRONG> <FORM ACTION="script08a.asp" METHOD="Post"> <INPUT TYPE="Text" NAME="WebPageVariable"><BR> <STRONG>How Much Money do you make each month?</STRONG><BR> <SELECT NAME="monthlySalary"> <OPTION>Under $5,000,000</OPTION> <OPTION>Above $5,000,000</OPTION> <OPTION>Nobody's darn business.</OPTION> </SELECT><BR> <INPUT TYPE="Submit" VALUE="Submit"> </FORM> </HTML>
Click Here to run script08.asp in a new window. It posts information to script08a.asp which is found below. In turn, script08a.asp posts information to script08b.asp which is also found below.
<%@LANGUAGE="JavaScript"%>
<%
var WebPageVariable = new String( Request.Form("WebPageVariable") )
WebPageVariable = WebPageVariable.toUpperCase();
var monthlySalary = new String( Request.Form("monthlySalary") )
monthlySalary = monthlySalary.toLowerCase();
%>
<HTML>
The Web Page Variable you typed is: <%=WebPageVariable%> <BR>
The monthly salary you listed is: <%=monthlySalary%> <BR>
<FORM ACTION="script08b.asp" METHOD="Get">
<INPUT TYPE="hidden" VALUE="<%=monthlySalary%>" NAME="QueryVariable">
<STRONG>Click the button to see Query Strings</STRONG><BR>
<INPUT TYPE="submit" VALUE="Submit">
</FORM>
</HTML>
We'll be using Request.Form when we "Post" an HTML form to the server. Notice that the NAME attribute in the HTML form corresponds to the "name" in
QueryString:
We'll be using Request.QueryString when we use an HTML form to "Get" a page from the server. Request.QueryString() is very similar to Request.Form(). Take a look at script08b.asp which I printed below.
<%@LANGUAGE="JavaScript"%>
<%
var QueryVariable = new String( Request.QueryString("QueryVariable") )
%>
<HTML>
The QueryString Value is: <%=QueryVariable%> <BR>
<%
if (QueryVariable != "Lesson 08's new Query!") { QueryVariable="Lesson 08's new Query!" QueryVariable=escape(QueryVariable)
%>
<A HREF="script08b.asp?QueryVariable=<%=QueryVariable%>">Click Here</A>
for the link to <I>script08b.asp?QueryVariable=<%=QueryVariable%></I>
<% } //closing bracket for if statement.
%>
</HTML>
If you haven't already, Click Here to run script08.asp in a new window. Cycle through all the forms and links, and then come back.
You can use Request.QueryString in two different ways. You can either use an HTML form to "Get" a page from the server, which will generate a query string. Or you can manually build a query string and add it to the backside of a link. We'll dissect script08b.asp from top to bottom.
var QueryVariable = new String( Request.QueryString("QueryVariable") )
The line above in script08b.asp corresponds to the line below from script08a.asp
<INPUT TYPE="hidden" VALUE="<%=monthlySalary%>" NAME="QueryVariable">
The NAME="someName" in the HTML form becomes the
About half way into script08b.asp are the lines I reprinted below.
<%
if (QueryVariable != "Lesson 08's new Query!") { QueryVariable="Lesson 08's new Query!" QueryVariable=escape(QueryVariable)
%>
We've already converted Request.QueryString() into a JavaScript string at the top of the script. So, now we can do a string comparison.
If the QueryVariable hasn't already been set equal to "Lesson 08's new Query!" then we do that. Then we use the
In lesson 14 we'll see a better way to encode URL's. When we study the Server Object, we'll see Server.URLEncode(). But for now, just know that escape() works.
You can have more than one QueryString on each page. If you lose count of your QueryStrings, then you use
The Request Shortcut:
Request.Form() and Request.QueryString() share a shortcut.
ServerVariables:
Server Variables represent the HTTP Headers sent to the server by the client. I won't demonstrate them all, because there are too many.
<%@LANGUAGE="JavaScript"%>
<HTML>
<TABLE BORDER="1">
<TR><TD>ALL_RAW</TD>
<TD><%=Request.ServerVariables("ALL_RAW")%></TD></TR>
<TR><TD>REMOTE_ADDR</TD>
<TD><%=Request.ServerVariables("REMOTE_ADDR")%></TD></TR>
<TR><TD>HTTP_USER_AGENT</TD>
<TD><%=Request.ServerVariables("HTTP_USER_AGENT")%></TD></TR>
<TR><TD>URL</TD>
<TD><%=Request.ServerVariables("URL")%></TD></TR>
</TABLE>
</HTML>
Click Here to run the script in a new window.
Demonstrated above are four (4) server variables. There are (give or take) about 50 server variables available. You can look up the full list of server variables for yourself on the internet.
Misc. Notes:
Request.BinaryRead() is the lone method and TotalBytes is the lone property.
评论 (0) All
