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07.12.2001. ASP (Active Server Pages) & ActiveX. Reyhan Serim. Fikret Sivrikaya. Interactive, Dynamic Web Pages. Allows interaction with user, information retrieval and processing, and conditional output, as opposed to static HTML pages.

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slide1

07.12.2001

ASP (Active Server Pages)

&

ActiveX

Reyhan Serim

Fikret Sivrikaya

interactive dynamic web pages
Interactive, Dynamic Web Pages
  • Allows interaction with user, information retrieval and processing, and conditional output, as opposed to static HTML pages.
  • Some technologies; Active Server Pages, PHP, CGI Scripting, Cold Fusion, Java Servlets or JSP
what is an active server page
What is an Active Server Page?
  • A text file that resides on the web server
  • Contains ASP code and also standard HTML tags.
  • Advantage over standard HTML pages: Dynamic content; pure HTML generated on the server is sent to the browser.
an example active server page

Scripting language code

<% .... %>

An example Active Server Page

<HTML>

<BODY>

<% For i = 2 To 5 %>

<FONT SIZE="<% = i %>">Hello World!<BR>

<% Next %>

</BODY>

</HTML>

<HTML>

<BODY>

<FONT SIZE=“2">Hello World!<BR>

<FONT SIZE=“3">Hello World!<BR>

<FONT SIZE=“4">Hello World!<BR>

<FONT SIZE=“5">Hello World!<BR>

</BODY>

</HTML>

scripting languages
Scripting Languages
  • The default (and widely used) scripting language: VBScript (a subset of Visual Basic)
  • Other alternatives: Jscript and Perl
  • We will use VBScript in our examples
requirements to run asp
Requirements to run ASP
  • Web Server
    • Microsoft Internet Information Server (IIS) or Personal Web Server (PWS)
    • Third parties develop ASP add-ins for other web servers
  • ODBC Drivers
    • For database interaction (if to be used)
  • Editor
    • A simple text editor is fine for development
asp programming with vbscript
ASP Programming with VBScript
  • No need to declare variables (except arrays)
  • Case Insensitive
  • Outputting varibale values: <%=var%>

<%

x = 2

x = “Authors”

%>

<%

Dim arr(5)

For i = 0 To 5

arr(i)=0

Next

%>

<%

Do While records.EOF

‘This is a comment

%>

<B><%=records(“name”)%></B><BR>

<%

records.MoveNext

Loop

%>

<% If num < 0 Then %>

<B>Negative Number</B>

<% ElseIf num > 0 Then %>

<B>Positive Number</B>

<% Else %>

<B>Number is 0</B>

<% End If %>

asp programming with vbscript1
ASP Programming with VBScript
  • Procedures and Functions

Subsub_name

statement group

End Sub

Function upperstr (str1)

retStr = str1

retStr = Replace(retStr, "i", "İ")

retStr = Replace(retStr, "ı", "I")

upperstr = UCase(retStr)

End Function

Functionfunc_name

statement group

func_name = x

End Function

html forms
HTML Forms
  • Asp pages mostly get information from HTML forms

<form action=“login.asp" method=“POST">

  • When a form is submitted, the browser creates a string consisting of all form filed names and their values -> “queryString”

username=demo&password=1234

  • “GET” vs “POST” as method

POST: send information as part of HTTP header

GET: send information as a string to the .asp

how asp files handle form data
How ASP Files Handle Form Data
  • the “Request” object

request(“field_name”)

<%

If request(“username”)=“demo” &&

request(“password”)=“1234” then

runDemo()

End if

%>

maintaining states
Maintaining States
  • Web is stateless; a page is requested by the browser, server send page and the transaction is complete
  • We may want to keep information through a set of pages (such as username and password)
  • One method: using hidden fields in HTML forms  hard to keep track of; every page must take and pass it to the next page
  • Alternative: ASP Session object
asp session object
ASP Session Object
  • Once created, Sessions variables available for other pages as long as the session is active

Session(“username”) = request(“username”)

  • The session is terminated after 20 minutes (default) of inactivity or by an explicit call to abondon method

Session.Abondon()

Session.Timeout [ = nMinutes]

  • Referencing Session variables:

if isempty( Session(“username”)) then

database interaction
Database Interaction
  • ODBC
    • Open Database Connectivity; a protocol functioning as an interface to databases for use of applications
    • A database is registered to ODBC with a DSN (Data Source Name)
    • ODBC holds the DSN, location, type of databases
    • For an application to interact with a database, it is enough to know its DSN only
    • SQL (Sctructured Query Language) is used to query databases
creating an odbc data source name
Creating an ODBC Data Source Name
  • Open Control PanelODBC
  • Select the System DSN tab
  • Click the Add… button
  • You are then prompted for a database driver. Select the correct one for your database (e.g. Microsoft Access Driver (*.mdb)) and Click Finish
  • Enter a Data Source Name (DSN) for this database (you choose the name). You can also provide a Description (optional)
  • The next stage is to provide a database  Click Select…
  • Locate your database then click OK.
  • Once you have provided a DSN and a database, click OK twice.
connecting to a database using asp
Connecting to a database using ASP

1. Create an instance of the Connection object

Set conn = Server.CreateObject("ADODB.Connection")

2. Open a connection to the database

conn.Open "data_source_name"

where data_source_name is the DSN as specified in ODBC

3. Create an Instance of the Recordset object

Set rsUsers= Server.CreateObject("ADODB.recordset")

The recordset (rsUsers) will store the results of the query. It will contain a number of database records depending on the result of the SQL query.

4. Execute the SQL statement and store the result

rsUsers.Open query_name,conn

query_name is a string variable containing the SQL query

connecting to a database using asp1
Connecting to a database using ASP

An Example Database Connection & Query

<%

Set conn = Server.CreateObject("ADODB.Connection")

conn.Open “members”

Query="Select username,password from tblUsers"

Set rsUsers = Server.CreateObject("ADODB.recordset")

rsUsers.Open Query,conn

%>

processing the query results the recordset
Processing the query results -the recordset-

<HTML>

<BODY>

<TABLE BORDER=1 CELLPADDING=0>

<TR><TD><B>Username</B></TD><TD><B>Password</B></TD></TR>

<%

Do While Not rsUsers.EOF

%>

<TR>

<TD><%=rsUsers("username")%></TD>

<TD><%=rsUsers("password")%></TD>

</TR>

<%

rsUsers.Movenext

Loop

%>

</TABLE>

</BODY>

</HTML>

login asp an asp page for login control
<%

‘Open a connection to database

Set conn = Server.CreateObject("ADODB.Connection")

conn.Open “members”

‘Run query to get the password for the specified username

Query="Select password from tblUsers WHERE username=‘“ & request(“username”) & “’”

Set rsUsers = Server.CreateObject("ADODB.recordset")

rsUsers.Open Query,conn

‘Check username and password

If rsUsers.EOF then

response.redirect “login_err.asp?type=user” ‘user not found

ElseIf rsUsers(“password”) <> request(“password”) then

response.redirect “login_err.asp?type=passwd” ‘invalid password

Else

session(“username”) = request(“username”) ‘login successful

response.redirect “members/index.asp”

End if

rsUser.Close

%>

Login.asp (an ASP page for login control)
a review of advantages disadvantages of asp
ADVANTAGES

Active Server Pages are browser independent.

Easy to create and use.

Offers choice of scripting languages.

No extra software costs.

DISADVANTAGES

Reliance on Microsoftplatforms.

Not a full program development environment, so debugging a script may not bestraightforward.

A Review of Advantages & Disadvantages of ASP
references for asp
References (for ASP)
  • http://les1.man.ac.uk/is/courses/asp/material.htm

A basic -easy to follow- introduction to ASP, examples and other resources (from Univ. of Manchester)

  • http://msdn.microsoft.com

MSDN (Microsoft Developer Network) Online

  • “ASP in a Nutshell: A Desktop Quick Reference”, 2000

by A. Keyton Weissinger

what is activex
What is ActiveX

A set of technologies that enables software components to interact with one another in a networked environment, regardless of the language in which they were created. ActiveX™ is built on the Component Object Model (COM).

com the fundamental object model for activex
COM: The Fundamental "Object Model" for ActiveX

COM(Component Object Model) is the technical cornerstone for the ActiveX technology; it defines how objects expose themselves for use within other objects and how objects can communicate between processes and across a network.

COM objects can be easily integrated for use in many languages, such as Java, Basic, and C++. COM objects are reusable binary components.

ole com
OLE &COM

OLE (Object Linking and Embedding) is a mechanism that allows users to create and edit documents containing items or “objects” created by multiple applications.

COM provides the infrastructure used when OLE objects communicate with each other.

activex on the client
ActiveX on the Client
  • Microsoft Internet Explorer, which brings the benefits of ActiveX to end users and enables them to run Java applets and ActiveX controls written in Java, Visual C++, and other languages.
  • Scripting engines for running scripts written in VB Script and JavaScript.
  • ActiveX controls bundled with Internet Explorer for viewing and editing different kinds of content such as ActiveVRML™ (for 3D virtual reality modeling), ActiveMovie™ (for audio/video), and more.
activex on the server
ActiveX on the Server
  • Microsoft Internet Information Server, which supports CGI applications, ISAPI DLLs, connectivity to databases, and so forth.
  • Server side scripting, code named Denali.
  • Transactions, code named Viper.
  • Message Queuing, code named Falcon.
why use activex
Why use ActiveX?
  • ActiveX Controls and Scripting give developers the infrastructure needed to add language- and tool-independent extensions to Web pages
  • Using ActiveX Controls lets developers take advantage of existing OLE development tools and the investment they have already made in OLE.
why use activex cont
Why use ActiveX? (cont.)
  • ActiveX Scripting allows you to drop any scripting engine into Internet Explorer, enabling developers to add behavior to Web pages in whatever scripting language they prefer
  • Combines the benefits of the World Wide Web and the personal computer to enable interactive distributed applications and richer communications between users.
why use activex cont1
Why use ActiveX? (cont.)
  • ActiveX has also greatly improved extending the HTTP and FTP protocols. The ActiveX encapsulate a new protocol that supports the concept of binding to a URL dynamically from within your application. An application binds to a URL moniker, which then communicates through the appropriate protocol to activate the OLE object.
slide30

Microsoft ActiveX supported standards

Standards and Technologies Area in ActiveX (partial listing)

Networking TCP/IP, IPX/SPX, PPP, SLIP, DNS, RIP, PPTP, DHCP, WINS, IPng, SSL

Web HTTP, HTML, VRML

Communication RTP, T.120, T.127, H.323, RSVP Messaging SMTP, X.400, MIME, POP3

Databases ODBC (ISO 9942), SQL

Programming ANSI C (ISO 9899), ANSI C++, Languages Java, Basic

Directory X.500

Miscellaneous FTP, Gopher, Telnet

activex components
ActiveX Components

An ActiveX component is a unit of executable code, such as an .exe, .dll, or .ocx file, that follows the ActiveX specification for providing objects. ActiveX technology allows programmers to assemble these reusable software components into applications and services.

activex components1
ActiveX Components
  • ActiveX DLL
  • ActiveX Exe
  • ActiveX Control
  • ActiveX Document
activex dll
ActiveX DLL

ActiveX objects can exist in the same process as their controller, or in a different process.

In-process server objects are implemented in a dynamic-link library (DLL) and are run in the process space of the controller. Since they are contained in a DLL, they cannot be run as stand-alone objects.

slide34

ActiveX DLL Example

An exe has its own process space

Application.exe

Dim x as Component1.Widget

Set x=New Widget

x.Spin

...

Application uses component by creating objects from classes the component provides and invoking properties end the methods of the objects

Component1.dll

Public Sub Spin()

Dim y as Component2.Gear

Set y =New Gear

....

End Sub

Component1 Winger class uses Gear class provided by another in process Component2 running the same applications workspace

ActiveX DLLs run on the process space of an exe

Component2.dll

activex dll creation steps
ActiveX DLL Creation Steps
  • Determine the features your component will provide.
  • Determine what objects are required to divide the functionality of the component in a logical fashion.
  • Design any forms your component will display.
  • Design the interface — that is, the properties, methods, and events — for each class provided by your component.
activex dll creation steps cont
ActiveX DLL Creation Steps(cont.)
  • Create a project group consisting of your component project and a test project.
  • Implement the forms required by your component.
  • Implement the interface of each class.
  • As you add each interface element or feature, add features to your test project to exercise the new functionality.
  • Compile your DLL and test it with all potential target applications.
activex exe
ActiveX Exe

Out-of-process server objects are implemented in an executable file and are run in a separate process space. Access to in-process objects is much faster than to out-of-process server objects because Automation does not need to make remote procedure calls across the process boundary.

slide38

ActiveX Exe Example

Uses an out-of-process component by creating objects from the classes component provides

The out-of-process component runs in its own process and provides Widget objects

Application.exe

Dim x as Component1.Widget

Set x=New Widget

x.Spin

...

Component1.exe...

Component2.dll

Dim x as Component1.Widget

Set x=New Widget

x.Spin

activex exe creation steps
ActiveX Exe Creation Steps
  • Determine the features your component will provide.
  • Determine what objects are required to divide the functionality of the component in a logical fashion.
  • Design any forms your component will display.
  • Design the interface — that is, the properties, methods, and events — for each class provided by your component.
activex exe creation steps cont
ActiveX Exe Creation Steps(cont.)
  • Create a separate test project, usually a Standard Exe project.
  • Implement the forms required by your component.
  • Implement the interface of each class.
  • As you add each interface element or feature, add features to your test project to exercise the new functionality.
  • Compile your Exe and test it with all potential target applications.
activex control
ActiveX Control

An ActiveX control, like a built-in control, is an object that you place on a form to enable or enhance a user\'s interaction with an application. ActiveX controls have events and can be incorporated into other controls. These controls have an .ocx file name extension.

slide42

An ActiveX control that simply uses events

A developer purchases ControlDemo.ocx and uses it to create an application

Application.exe

...

ControlDemo.ocx

Private Sub UserControl_Click()

End Sub

When the user of the application clicks on the control the UserControl object receives an event

Any code the outer of the control has placed ın the click event procedure will get executed. The developer doesn\'t have an event procedure to put the code into

inserting activex controls into an html page
Inserting ActiveX controls into an HTML page

Developers can insert ActiveX controls into a Web page by using the <OBJECT> tag in the HTML page and referring to the ClassId of the ActiveX control.

activex control creation steps
ActiveX Control Creation Steps
  • Determine the features your control will provide.
  • Design the appearance of your control.
  • Design the interface for your control — that is, the properties, methods, and events your control will expose.
  • Create a project group consisting of your control project and a test project.
  • Implement the appearance of your control by adding controls and/or code to the UserControl object.
activex control creation steps cont
ActiveX Control Creation Steps(cont.)
  • Implement the interface and features of your control.
  • As you add each interface element or feature, add features to your test project to exercise the new functionality.
  • Design and implement property pages for your control.
  • Compile your control component (.ocx file) and test it with all potential target applications.
activex document
ActiveX Document

ActiveX documents are forms that can appear within Internet browser windows. Visual Basic ActiveX documents offer built-in viewport scrolling, Hyperlinks, and menu negotiation.

ActiveX documents are designed the same as Visual Basic forms. They can contain insertable objects, such as Microsoft Excel pivot tables. They can also show message boxes and secondary forms.

activex document creation steps
ActiveX Document Creation Steps
  • Determine the features your document will provide.
  • Design the appearance of your document.
  • Design the interface for your document; that is, the properties, methods, and events your document will expose.
  • Create a project consisting of your user document and any auxiliary forms.
activex document creation steps cont
ActiveX Document Creation Steps(cont.)
  • Add controls and/or code to the UserDocument object.
  • Implement the interface and features of your document.
  • Compile your document to create a .vbd file and test it with all potential target applications.
references for activex
References (for ActiveX)
  • “ActiveX Programming Unleashed”, Weiying Chen

Free online book available for download at http://www.developer.com

  • http://msdn.microsoft.com

MSDN (Microsoft Developer Network) Online

  • “Microsoft Visul Basic, Books Online”
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