Browser and Server Models. Jim Fawcett CSE686 - Internet Programming Spring 2011

Transcription

1 Browser and Server Models Jim Fawcett CSE686 - Internet Programming Spring 2011

2 Topics Web Programming Model Browser Model Server Model

3 Client/Server - Current Web Model Windows Server Client Computer Internet Information Server HTML CAB HTML File ActiveX Controls, Java Applets Browser HTML CGI Application written in Perl Renderer htm, txt, jpg, bmp, doc, vsd Script Engine HTTP Internet Services API (ISAPI) ISAPI calls and notifications ISAPI calls and notifications Legacy Applications DLL created with C++ SQL Server.Net CLR With C# ISAPI calls and notifications Asp.Net Pages (Aspx) ActiveX Controls, Java Applets Script Engine VBScript, JavaScript Active Server Pages (ASP) Active Data Object (ADO) FTP Client FTP FTP Server CAB ActiveX Controls, Java Applets Files of any Type

4 Browser Object Model Window Frame Event Navigator Location Script Document Form Anchor Link Element History

5 Window Object Used to obtain information about: the state of a browser window the document in a window Window events Summary Properties: parent, screenleft,. Methods: open, resizeby, Collections: frames Events: onerror, onload, Objects: event, document, external, screen, Example: cse686/lecture2/dhtmlex1.htm

6 Event Object Event objects provide information about events on a web page. Summary Properties: altkey, button, clientx, keycode, Methods: none Collections: bookmarks, (data) boundelements Events: none Example: cse686/lecture2/dhtmlex2.htm

7 Document Object Represents the HTML document in a browser window Summary Properties: BGCOLOR, DIR Methods: attachevent, createelement, Collections: all, children, images, Events: onclick, ondrag, Example: cse686/lecture2/dhtmlex3.htm

8 Form Object Used to collect and display user information, validate input, and send data to a web server. Summary Properties: action, firstchild, method, Methods: submit, Collectons: all, elements, Events: onkeydown, onsubmit, Example: cse686/lecture2/dhtmlex4.htm

9 Server Object Model Application Object Request Object Response Object Server Object Session Object File Access Component Ad Rotator Component Browser Capabilities Component Content Linker Component Active Data Object Component

10 Application Object Share information between all users of your web site. Summary Properties: None Methods: Contents.Remove, Contents.RemoveAll, Lock, Unlock Collections: Contents, StaticObjects Events: OnEnd, OnStart

11 Request Object Retrieve information from the current user. Access all information in the HTTP request. Used to extract data from a form or URL parameters. Summary Properties: Total bytes Methods: BinaryRead Collections: ClientCertificate, Cookies, Form, QueryString, ServerVariables Events: None Example: see DHTMLex4.asp handout

12 Response Object Return information to the user s browser. Summary Properties: Buffer, CacheControl, Charset, ContentType, Expires, ExpiresAbsolute, IsClientConnected, PICS, Status Methods: AddHeader, AppendToLog, BinaryWrite, Clear, End, Flush, Redirect, Write Collections: Cookies Events: None Example: cse686/lecture2/aspex1.asp Example: cse686/lecture2/aspex2.asp

13 Server Object Determine server specific properties. Load ActiveX dlls Summary Properties: ScriptTimeout Methods: CreateObject, Execute, GetLastError, HTMLEncode, MapPath, Transfer, URLEncode Events: None Example: cse686/lecture2/aspex5.asp

14 Session Object Saves information about the current user as cookies on the client machine. Summary Properties: CodePage, LCID, SessionID, Timeout Methods: Abandon, Contents.Remove, Contents.RemoveAll Collections: Contents, StaticObjects Events: Session_OnEnd, Session_OnStart

15 Server Component Objects Dictionary Object FileSystemObject Object AdRotator Component Browser Capabilities Component Content Linking Component ActiveX Data Objects

16 Dictionary Object Create Dictionary Object Set objdict = _ Server.CreateObject( Scripting.Dictionary ) Add item: objdict.add key, value objdict.add Name Jim Fawcett objdict.add Employer Syracuse Univ Size: objdict.count Item: objdict.item(key) Example: cse686/lecture2/aspex3.asp

17 FileSystemObject Object Create FileSystemObject: Set objfile = _ Server.CreateObject( Scripting.FileSystemObject ) List Drives: For Each sdrive In objfile.drives Response.Write sdrive & Get Drive: Set cdrive = objdrive.getdrive( C ) Get Root Folder: Set croot = cdrive.rootfolder List Files: For Each sfile In croot.files Response.Write sfile & <br /> Example: cse686/lecture2/aspex4.asp

18 End of Presentation