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Active Server Page - ASP in JavaScript

Active Server Page - ASP in JavaScript. 王金龍、陳彥錚 銘傳大學 資管系. Content. Introduction Object Models Request Object Response Object Server Object Application and Session Objects Installable Components for ASP. Introduction.

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Active Server Page - ASP in JavaScript

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  1. Active Server Page - ASPin JavaScript 王金龍、陳彥錚 銘傳大學 資管系

  2. Content • Introduction • Object Models • Request Object • Response Object • Server Object • Application and Session Objects • Installable Components for ASP

  3. Introduction • Microsoft’s newest server-based technology for building dynamic interactive web pages • No compiler • Text editor • Browser independent • Object-oriented • Compatible to any ActiveX scripting • Transparent to users

  4. ASP Usage <%@language=JScript%> <html> <head> <title>Active Server Scripting</title> </head> <body> <h3>Active Server Scripting </h3> <% Response.Write("This is so cool!!!”)%> </body> </html>

  5. Complete ASP Program <%@Language=JScript %> <HTML><HEAD> …</HEAD><BODY> <% … ASP script which runs on the server … %> <SCRIPT LANGUAGE=“JavaScript”> Script which run in the browser </SCRIPT> <SCRIPT LANGUAGE=“JScript” RUNAT=Server> Script which run in the server </SCRIPT> <!-- #include … --> <table> … </table> <% … %> </BODY></HTML>

  6. Server-side includes • <!-- #include file=“include.txt” --> • Include text files in pages • Virtual file addresses • <!-- #include virtual=“/u99/file.txt” --> • Physical file addresses • <!-- #include file=“c:\inetpub\user99\file.txt” --> • <!-- #include file=“file.txt” -->

  7. <!-- menu.inc --><A HREF="top.htm">Top</A><BR><A HREF="next.htm">Next</A><BR><A HREF="previous.htm">Previous</A><BR><P> … <body> <h3>Form Use </h3> <!--#INCLUDE FILE="menu.inc"--> <% Response.Write(Request.Form("text1")); %> </body>

  8. Basic Statements • <% Response.Write(“string”) %> • Output a string ( more readable ) • <% = “string” %> or <%=VarExpression%> • Insert a string • <%=Request.Form(“userName”)%> • <% Response.Redirect(“URL”) %> • Redirect to the URL • <% // Some Comments %>

  9. An ASP Example <%@language=JScript%> <% num=Request.Form("numOfHr"); msg="Welcome to My ASP Example!"; %> <html> <head><title>An ASP Example</title></head> <body> You are <b><%=Request.Form("userName")%></b>!<br> <%=msg%> <hr> <% for ( i=1; i<=num; i++) { %> <font color=blue>Iteration <i><%=i%></i></font> <% Response.Write("<hr width="+i*50+" align=left>"); } %> </body> </html>

  10. aspExample1.html <html> <body> <form method="post" action="aspExample1.asp"> Please input a number: <input type=text name="numOfHr" size=4><br> Your Name: <input type=text name="userName"><br> <input type=submit> </form> </body> </html>

  11. Source File in Web Client <html> <head><title>An ASP Example</title></head> <body> You are <b>Yen-Cheng Chen</b>!<br> Welcome to My ASP Example! <hr> <font color=blue>Iteration <i>1</i></font> <hr width=50 align=left> <font color=blue>Iteration <i>2</i></font> <hr width=100 align=left> <font color=blue>Iteration <i>3</i></font> <hr width=150 align=left> <font color=blue>Iteration <i>4</i></font> <hr width=200 align=left> <font color=blue>Iteration <i>5</i></font> <hr width=250 align=left> </body> </html>

  12. Built-In ASP Objects • Request Object • To retrieve the values that the client browser passed to the server during an HTTP request. • Response Object • To send output to the client. • Server • Provide utility functions on the server.

  13. Built-In ASP Objects (cont.) • Application • To share information among all users of a given application. (Like global variables) • Session • To store information needed for a particular user-session. (Like local variables) • ObjectContext • To commit or abort a transaction, managed by Microsoft Transaction Server (MTS).

  14. Client RequestObject Collection: Form QueryString ServerVariables Cookie ClientCertificate ResponseObject Collection: Cookie (Properties) (methods) Server ApplicationObject (properties) (methods) ServerObject (method) SessionObject (properties) (methods)

  15. Request Object • Provide all the information about the user’s request to applications • Collection • A data store that can store values by linking each one to a unique key

  16. Collections in Request Object • Five collections • QueryString: HTTP query string (GET) • Form: Form elements (POST) • ServerVariables: HTTP and environment variables • Cookie: Cookie sent from the browser • ClientCertificate: Certificate values (SSL: https) • Usage variable = Request.collectionName(“key”)

  17. Properties and Methods • Properties • TotalBytes: Read-only. Specifies the total number of bytes the client is sending in the body of the request. • Methods • BinaryRead(count): Retrieves data sent to the server from the client as part of a POST request.

  18. QueryString Collection: Get • The names and values of form are put into a query string • The amount of data can be sent is limited to around 1000 characters • Usage • variable = Request.QueryString(“name”)

  19. queryTest.asp queryTest.asp?name=Mickey+Mouse&age=50 <%@language=JScript%> <html><head><title>Query String Test ASP</title></head><body> You are <font color=red><%=Request.QueryString("name")%></font><br> You are <font color=red><%=Request.QueryString("age")%></font> years old. </body></html>

  20. <HTML><HEAD><TITLE></TITLE></HEAD><BODY><H3>Passing Name=Value Pairs with a Query String</H3><A NAME="product" HREF="list7_5.asp?name=dina&pub=sams">Sams Publishing </A></BODY></HTML> <html> <head> <title></title> </head> <body> <h3>Getting Name=Value Pairs with a Query String</h3> <p>name = <%= Request.QueryString("name") %></p> <p>pub = <% = Request.QueryString("pub") %> </p> </body> </html>

  21. Form Collection: Post • The name and values of the form are encoded into the request header • Usage • variable = Request.Form(“name”)

  22. formTest.html <html><head> <title>the form</title></head><body> <form name="form1" method=post action="formTest.asp"> text1: <input type=text name="text1" size=20><br> radio1: <input type=radio name="radio1" value="yes">yes <input type=radio name="radio1" value="no">no<br> select1: <select name="select1"> <option>option 1<option>option 2<option>option 3 </select><br> select2: (multiple) <select name="select2" multiple> <option>option 1M<option>option 2M<option>option 3M </select><br> textarea1: <textarea name="textArea1" cols=10 rows=5> </textarea><br> <input type=hidden name="hidden1" value="a hidden value"> <input type=submit value="o.k.!"> <input type=reset value="cancel"> </form> </body></html>

  23. formTest.asp <%@language=JScript%> <html><head><title>Form Test ASP</title></head><body> <table border=2> <tr><td>text1</td><td><%=Request.Form("text1")%></td></tr> <tr><td>radio1</td><td><%=Request.Form("radio1")%></td></tr> <tr><td>select1</td><td><%=Request.Form("select1")%></td></tr> <%num=Request.Form("select2").Count; for (i=1;i<=num;i++) { %> <tr><td>select2</td> <td><%=Request.Form("select2")(i)%></td></tr> <% } %> <tr><td>hidden1</td> <td><%=Request.Form("hidden1")%></td></tr> <tr><td>textArea1</td> <td><%=Request.Form("textArea1")%></td></tr> </table> </body></html>

  24. ServerVariables Collections • Provide HTTP header that is sent by a client browser • To Retrieves the values of predetermined environment variables. • Usage • variable = Request.ServerVariables(“HeaderType”)

  25. AUTH_TYPE = <%= Request.ServerVariables("AUTH_TYPE") %><br> CONTENT_LENGTH = <% = Request.ServerVariables("CONTENT_LENGTH") %><br> CONTENT_TYPE = <% = Request.ServerVariables("CONTENT_TYPE") %><br> GATEWAY_INTERFACE = <% = Request.ServerVariables(“GATEWAY_INTERFACE”) %><br> LOGON_USER = <% = Request.ServerVariables("LOGON_USER") %><br> PATH_INFO = <% = Request.ServerVariables("PATH_INFO") %><br> PATH_TRANSLATED = <% = Request.ServerVariables("PATH_TRANSLATED") %><br> QUERY_STRING = <% = Request.ServerVariables("QUERY_STRING") %><br> REMOTE_ADDR = <% = Request.ServerVariables("REMOTE_ADDR") %><br> REMOTE_HOST = <% = Request.ServerVariables("REMOTE_HOST") %><br> REMOTE_METHOD = <% = Request.ServerVariables("REMOTE_METHOD") %><br> SCRIPT_MAP = <% = Request.ServerVariables("SCRIPT_MAP") %><br> SCRIPT_NAME = <% = Request.ServerVariables("SCRIPT_NAME") %><br> SERVER_NAME = <% = Request.ServerVariables("SERVER_NAME") %><br> SERVER_PORT = <% = Request.ServerVariables("SERVER_PORT") %><br> SERVER_PORT_SECURE = <%=Request.ServerVariables("SERVER_PORT_SECURE") %><br> SERVER_PROTOCOL = <% = Request.ServerVariables("SERVER_PROTOCOL") %><br> SERVER_SOFTWARE = <% = Request.ServerVariables("SERVER_SOFTWARE") %><br> URL = <% = Request.ServerVariables("URL") %><br>

  26. ALL_HTTP All HTTP headers sent by the client. ALL_RAW All headers in the raw-form. APPL_MD_PATH The metabase path for the (WAM) Application for the ISAPI DLL. APPL_PHYSICAL_PATH Retrieves the physical path corresponding to the metabase path. AUTH_PASSWORD The value entered in the client's authentication dialog. AUTH_TYPE The authentication method that the server uses to validate users. AUTH_USER Raw authenticated user name. CERT_COOKIE Unique ID for client certificate, Returned as a string. CERT_FLAGS bit0 is set to 1 if the client certificate is present. bit1 is set to 1 if the client Certifying Authority is invalid. CERT_ISSUER Issuer field of the client certificate. CERT_KEYSIZE Number of bits in Secure Sockets Layer connection key size. CERT_SECRETKEYSIZE Number of bits in server certificate private key. CERT_SERIALNUMBER Serial number field of the client certificate. CERT_SERVER_ISSUER Issuer field of the server certificate. CERT_SERVER_SUBJECT Subject field of the server certificate. CERT_SUBJECT Subject field of the client certificate. CONTENT_LENGTH The length of the content as given by the client. CONTENT_TYPE The data type of the content. GATEWAY_INTERFACE The revision of the CGI specification used by the server. HTTP_<HeaderName> The value stored in the header HeaderName. HTTPS ON : if the request came in through secure channel (SSL). OFF : Otherwise.

  27. HTTPS_KEYSIZE Number of bits in Secure Sockets Layer connection key size. HTTPS_SECRETKEYSIZE Number of bits in server certificate private key. HTTPS_SERVER_ISSUER Issuer field of the server certificate. HTTPS_SERVER_SUBJECT Subject field of the server certificate. INSTANCE_ID The ID for the IIS instance in textual format. INSTANCE_META_PATH Metabase path for the IIS instance that responds to the request. LOCAL_ADDR Returns the Server Address on which the request came in. LOGON_USER The Windows NTR account that the user is logged into. PATH_INFO Extra path information as given by the client. PATH_TRANSLATED A translated version of PATH_INFO (virtual-to-physical) QUERY_STRING Query information after ? in the HTTP request. REMOTE_ADDR The IP address of the remote host making the request. REMOTE_HOST The name of the host making the request. REMOTE_USER Unmapped user-name string sent in by the User. REQUEST_METHOD The method used to make the request. SCRIPT_NAME A virtual path to the script being executed. SERVER_NAME The server's host name, DNS alias, or IP address. SERVER_PORT The port number to which the request was sent. SERVER_PORT_SECURE 1 : If the request is on the secure port. 0 : Otherwise. SERVER_PROTOCOL The name and revision of the request information protocol. SERVER_SOFTWARE The name and version of the server software. URL Gives the base portion of the URL.

  28. Cookie Collection • The cookie is a text file stored on the client • Use Request object to access the cookie • Read only • To change cookie: Use Response object • Usage • variable = Request.Cookies(“cookieVariable”)

  29. Response Object • To send output to the client • Collection: Cookie • Properties • Buffer • CacheControl • Charset • ContentType • Expires • ExpiresAbsolute • isClientConnected • Pics • Status • Method • AddHeader(name, value) • AppendToLog(string) • BinaryWrite(data) • Clear() • End() • Flush() • Redirect(url) • Write(variant)

  30. Response Object: Classification • Insert information • Write(), BinaryWrite() • Send cookie: Cookie • Redirecting: Redirect() • Buffering the page • Buffer, Flush(), Clear(), End() • Setting the properties of a page • Expires, ExpiresAbsolute, CacheControl, ContentType, AddHeader, Status

  31. Inserting Information • Response.Write(“string”) • Insert a string into the HTML output • Convert the text to an appropriate character set • <% = “string” %> • Response.BinaryWrite(data) • Prevent the conversion

  32. Sending Cookies • Response.Cookies(“CookieName”)=“data” • Response.Cookies(“CookieName”).Expires=“11/26/1197 17:35:00” • Response.Cookies(“CookieName”).Domain=“/netnt.mcu.edu.tw/” • Response.Cookies(“CookieName”).Path=“/u99” • Response.Cookies(“CookieName”).Secure=True • Multiple Value Cookie <% Response.Cookies(“CookieName”)(“item1”)=“data1” Response.Cookies(“CookieName”)(“item2”)=“data2” %>

  33. Redirecting the Browser • Refer users to alternative web pages • Redirection header • Tell the browser to go and get the information elsewhere • Usage • Response.Redirect(“URL”)

  34. Buffering the Page • An extra degree of control over • When a client receives information • What they receive • Usage • Response.Buffer = True ’Default is false • Response.Flush() ’Send the current content • Response.Clear() ’Clear the current buffer • Response.End() ’Stop processing and send • When reach the end, the contents are sent

  35. Server Object • The roof of the object model • Provides access to methods and properties on the server. • Most of these methods and properties serve as utility functions. • Property • ScriptTimeout: Amount of time a script can run • Method • CreateObject(progID) Create an instance of an object • HTMLEncode(string) HTML Encoding • URLEncode(string) URL Encoding • MapPath(path) Convert a virtual path to a physical path

  36. ScriptTimeout Property • Define the delay before all scripts are terminated • Default = 90 seconds • Usage • Server.ScriptTimout = nn;

  37. HTMLEncode Method • Replace the angle-brackets with an escape sequence • Server  Client <% = Server.HTMLEncode(“<Table>”) %> <% = Server.HTMLEncode(“<%=Server.ScriptTimeout %\>”) %>

  38. URLEncode Method • Convert a string into URL-encoded form • Space  + • Special chars  %nn <a href=“a1.asp?ans=<%server.urlencode(33%) %>”> 33 % </a> <a href=“a1.asp?ans=33%25”> 33% </a>

  39. MapPath Method • Provide file location information for use in scripts • Logical path  Physical path • Usage • PhyPath = Server.MapPath(“/clipper”) • e:\clipper • /path: virtual directory • path: relative path

  40. CreateObject Method • Invoke objects on the server • Extend the use of server components • Usage • Set obj = Server.CreateObject(“ProgId”) • Use the methods and access the properties of the object • IsObject( obj ) • Check if the object is created successfully

  41. <%@language=JScript%> <% textfile = Server.MapPath("/app5")+"\\test1.html" fsObject = Server.CreateObject("Scripting.FileSystemObject") outStream= fsObject.CreateTextFile(textfile, true, false) myString = "<HTML><HEAD><TITLE>File</TITLE></HEAD>" outStream.WriteLine(mystring) now=new Date() myString = "The time is " + now.toLocaleString() outStream.WriteLine(mystring) outStream.WriteLine("</BODY></HTML>") outStream.close() Response.Write("<A HREF='test1.html'>My New Text File </A>")%>

  42. Application Object • To share information among all users of a given application. • An ASP-based application is defined as all the .asp files in a virtual directory and its subdirectories. • Collections • Contents: Contains all of the items that have been added to the Application. • StaticObjects: Contains all of the objects added to the session with the <OBJECT> tag.

  43. Application Object (cont.) • Methods • Lock: Prevents other clients from modifying Application object properties. • Unlock: Allows other clients to modify Application object properties. • Events • Application_OnEnd : Occurs when the application quits • Application_OnStart : Occurs when a page is first referred. • Scripts for the preceding events are declared in the global.asa file.

  44. Application Object • Usage Application.Lock() Application(“name”)=“value” Application.Unlock() • Event handles: • global.asa in the root directory of the virtual mapping function Application_OnStart() { … } function Application_OnEnd() { … }

  45. Example - Application Object <%@language=JScript%> <% Application.Lock() Application("NumVisits") = Application("NumVisits") + 1 Application.Unlock() %> ... This application page has been visited <%= Application("NumVisits") %> times! Global.asa <script language=Jscript runat=server> function Application_OnStart(){ Application(“NumVisits”)=0; } </script>

  46. Application Object • Application Life • Start • The application starts the first time any client requests a document from that virtual mapping • End • The web server is stopped by the operating system

  47. appTest.html <FORM METHOD=POST NAME="Personal" ACTION="appTest.asp"> Please enter your name: <input type=text size=20 name="name" value=""><br> Please enter your age: < input type=text size=5 name="age" value=""><br> Please select which city your are living in: <SELECT NAME="city" ><P> <OPTION VALUE="Seattle">Seattle <OPTION VALUE="Denver">Denver <OPTION VALUE="Miami">Miami </SELECT><br> <INPUT TYPE=SUBMIT></FORM>

  48. appTest.asp <%@language=JScript%> <% Application.Lock() Application("name") = ""+Request.Form("name") Application("age") = ""+Request.Form("age") Application("city") = ""+Request.Form("city") Application.Unlock() %> <body> <h3>Hello <%= Application("name") %>, thank you</h3> <% if (Application("city") = = "Seattle") { %> The weather in <%= Application("city") %> is grey skies and plenty of rain. <% } else if (Application("city") = = "Denver") { %> The weather in <%= Application("city") %> is cold and snowy. <% } else { %> The weather in <%= Application("city") %> is warm and sunny. <% } %> </p> <form name=“age” method=“POST” action="app2.asp"> <p><input type="SUBMIT" value="OK"> </p>

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