First, the basic knowledge of ASP
1. ASP is the abbreviation for active Server pages and is an interpreted scripting locale;
2. The operation of the ASP requires Windows operating system, the installation of PWS is required under 9x, and NT/2000/XP needs to install Internet Information Server (IIS);
3. ASP and JSP script tag is "<%%>", PHP can be set to a variety of;
4. The annotation symbol for ASP is "'";
5. Using additional components, you can extend the functionality of the ASP.
Example:
Helloworld_1.asp
<%= "Hello,world"%>
Effect:
Hello,world
Helloworld_2.asp
<%
For I=1 to 10
Response.Write "Hello,world"
Next
%>
Effect:
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Note: ASP is case-insensitive; variables need not be defined or used, the conversion is convenient; the grammar check is very loose.
Second, the use of ASP built-in objects:
You can use any of the following ASP built-in objects without having to specifically declare them in ASP scripts.
1. Request:
Definition: Can be used to access the request information sent from the browser to the server, which is used to read information about the HTML form that has been entered.
Set:
Cookies: Contains the value of the browser cookies
Form: Contains values from HTML form fields
QueryString: A value containing a query string
ServerVariables: Contains the values in the header and environment variables
Example:
Request_url.asp
<%
' Get user input and save in variable
User_id=request.querystring ("user_id")
User_name=request.querystring ("user_name")
' Determine if user input is correct
If user_id= "" Then
Response.Write "USER_ID is null,please check it"
Response.End
End If
If User_name= "" Then
Response.Write "User_name is null,please check it"
Response.End
End If
' Print variable
Response.Write user_id& "<br>"
Response.Write User_name
%>
Effect:
When you access http://10.1.43.238/course/request_url.asp?user_name=j:
USER_ID is null,please check it
When you access http://10.1.43.238/course/request_url.asp?user_name=j&user_id=my_id:
my_id
J
Thinking: How are variables passed in URLs and retrieved by ASP pages?
Request_form.htm
<style type= "Text/css" >
<!--
. Input {background-color: #FFFFFF; border-bottom:black 1px solid;border-left:black 1px solid; Border-right:black 1px so Lid;border-top:black 1px solid; Color: #000000; font-family:georgia; Font-size:9pt;color:midnightblue;}
a:link {color: #1B629C; Text-decoration:none}
a:hover {color: #FF6600; Text-decoration:underline}
a:visited {Text-decoration:none}
-->
</style>
<center>
<form name= "Course" action= "request_form.asp" method= "POST" >
User_id:<input type= "text" name= "user_id" maxlength= "" class= "input" ><br><br>
User_name:<input type= "text" name= "user_name" maxlength= "" class= "Input" >
</form>
<br><br>
<a href= "Javascript:document.course.submit ();" > Submit </a>
</center>
Request_form.asp
<%
' Get user input and save in variable
User_id=request.form ("user_id")
User_name=request.form ("user_name")
' Determine if user input is correct
If user_id= "" Then
Response.Write "USER_ID is null,please check it"
Response.End
End If
If User_name= "" Then
Response.Write "User_name is null,please check it"
Response.End
End If
' Print variable
Response.Write user_id& "<br>"
Response.Write User_name
%>
Note: How does the action of the form point to the difference between request_form.asp and request_url.asp on the source code?
2. Response:
Definition: Used to post messages back to the browser, which can be used to send output from the script to the browser.
Set:
Cookies: Add a cookie to the browser
Method:
End: processing of ending scripts
Redirect: Boot the browser to the new page
Write: Send a string to the browser
Property:
Buffer: Caching an ASP
CacheControl: Control caching by proxy server
ContentType: The content type of the specified response
Expires: Browsers control caching with relative time
ExpiresAbsolute: Browsers use absolute time to control caching
Example:
Response_redirect.asp
<%
' Go to Google and check it out.
Response.Redirect "http://www2.google.com";
Response.End
%>
Response_cookies.asp
<%
' Set and read cookies
Response.Cookies ("Time_now") =now ()
Response.Write Request.Cookies ("Time_now")
%>
Effect:
When you access http://10.1.43.238/course/response_cookies.asp:
2002-9-1 16:20:40
Response_buffer.asp
<% ' response.buffer=true%>
<a href= "a" >a</a>
<%response.redirect "Request_form.htm"%>
Effect:
①. Error accessing this page when the buffering function of IIS is turned off
A
Reply to object error ' ASP 0156:80,004,005 '
Head wrong
/course/response_buffer.asp, Line 3
