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<% ASP %>

<% ASP %>. <p> Part 2 </p>. Outline. Arrays Functions Passing Variables in a URL Passing variables with forms Sessions. Arrays. An array is a set of indexed elements where each has its own, unique identification number. Ex: <% Dim fruitlist , arrFruits

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  1. <% ASP %> <p> Part 2 </p>

  2. Outline • Arrays • Functions • Passing Variables in a URL • Passing variables with forms • Sessions

  3. Arrays • An array is a set of indexed elements where each has its own, unique identification number. • Ex: <% Dim fruitlist, arrFruits fruitlist= "apples, pears, bananas, oranges, lemons" arrFruits= Split(fruitlist,",") %>

  4. Array Ex: <% Dim fruitlist, arrFruits fruitlist= "apples, pears, bananas, oranges, lemons" arrFruits= Split(fruitlist,",") Response.Write"<p>The list of fruits:</p> Response.Write"<ul>“ Response.Write"<li>" & arrFruits(0) & "</li>“ Response.Write"<li>" & arrFruits(1) & "</li>" Response.Write"<li>" & arrFruits(2) & "</li>“ Response.Write"<li>" & arrFruits(3) & "</li>“ Response.Write"<li>" & arrFruits(4) & "</li>“ Response.Write"</ul>" %>

  5. Functions • A function process inputs and return an output. • It can be useful if, for example, you have a wide range of data you have processed or if you have calculations or routines in other ways that must be performed many times. • Syntax: • Function Name(list of parameters) • Statement • End Function

  6. Functions Ex1: <% Function AddAll(number1, number2, number3) AddAll= number1 + number2 + number3 End Function Response.Write"123 + 654 + 9 equals" & AddAll(123,654,9) %>

  7. Functions Ex2:

  8. Passing Variables in a URL • Maybe you have wondered why some URLs looks something like this: http://html.net/page.asp?id=1254 • Why is there a question mark after the page name? • The answer is that the characters after the question mark are anHTTP query string. • An HTTP query string can contain both variables and their values. • In the example above, the HTTP query string contains a variable named id, with the value 1254.

  9. http://html.net/tutorials/asp/lesson10_ex2.asp?name=Joe&age=24http://html.net/tutorials/asp/lesson10_ex2.asp?name=Joe&age=24 <html> <head> <title>QueryString</title> </head> <body> <% ' Variable name and age is found in the URL Response.Write "<h1>Hello " & Request.QueryString("name") & "</h1>" Response.Write "<h1>You are " & Request.QueryString ("age") & " years old</h1>“ %> </body> </html>

  10. Passing variables with forms • When you code a form, there are two particular important attributes:  • Action • Method

  11. Passing variables with forms • When you code a form, there are two particular important attributes:  • Action • Is used to enter the URL where the form is submitted. • In this case it would be the ASP file that you want to handle the input. • Method

  12. Passing variables with forms • When you code a form, there are two particular important attributes:  • Action • Method • Can either have the value "post" or "get" which are two different methods to pass data. • Using "get", the data is sent through the URL, • Using "post", the data is sent as a block of data through standard input service (STDIN)

  13. An HTML page with a form • The page that contains the form doesn't need to be an ASP file (but it can be) <html> <head> <title>Form</title> </head> <body> <h1>Enter your name</h1> <form method="post" action="handler.asp"> <input type="text" name="username"> <input type="submit"> </form> </body> </html>

  14. User input and conditions <html> <head> <title>Form</title> </head> <body> <form method="post" action="handler.asp"> <p>What is your name:</p> <input type="text" name="username"> <p> What is your favorite color: <input type="radio" name="favoritecolor" value="r" /> Red <input type="radio" name="favoritecolor" value="g" /> Green <input type="radio" name="favoritecolor" value="b" /> Blue </p> <input type="submit" value="Submit" /> </form> </body> </html> example :http://html.net/tutorials/asp/lesson11_ex2.asp

  15. The Result of the previous Form

  16. Example <% strHeading= "<h1>Hello " & Request.Form("username") & "</h1>" Select Case Request.Form("favoritecolor") Case "r" strBackgroundColor = "rgb(255,0,0)" Case "g" strBackgroundColor = "rgb(0255.0)" Case "b" strBackgroundColor = "rgb(0,0,255)" Case Else strBackgroundColor = "rgb(255,255,255)" End Select %> <html> <head> <title>Form</title> </head> <body style="background: <% = strBackgroundColor%>;"> <% Response.WritestrHeading%> </body> </html>

  17. Sessions <% Session ("StartTime") = Now %> • Thereby, a session was started. • As described above, each session is given an ID by the server. <% Response.Write Session("StartTime") %> • Session have a default duration of 20 minutes • Can be changed using the following code: <% Session.Timeout = 60 %> • If you want to stop a session, it can always be killed in this way: <% Session.Abandon%>

  18. Login system with sessions <html> <head> <title>Login</title> </head> <body> <form method="post" action="login.asp"> <p> Username: <input type="text" name="username" /> </p> <p>Password: <input type="text" name="password" /></p> <p><input type="submit" value="Let me in" /></p> </form> </body> </html> Example: http://html.net/tutorials/asp/lesson12_ex1.asp

  19. <html> <head> <title>Login</title> </head> <body> <% ' Check if username and password are correct If Request.Form("username") = "asp" AND Request.Form("password") = "asp" Then ' If correct, we set the session to YES Session("login") = "YES" Session.Timeout= 30 Response.Write"<h1> You are now logged in</h1>" Response.Write"<p><a href='document.asp'>Link to protected file</a></p>“ Else 'If not correct, we set the session to NO Session("login") = "NO" Session.Timeout= 30 Response.Write"<h1>You are NOT logged in</h1>" Response.Write"<p><a href='document.asp'>Link to protected file</a></p>" End If %> </body> </html>

  20. <% ' If the user is not logged in ' send him/her to the login form If Session ("login") <>"YES" Then Response.Redirect“form.asp” End If %> <html> <head> <title>Login</title> </head> <body> <h1>This document is protected</h1> <p>You can only see it if you are logged in.</p> </body> </html>

  21. <% Thank You %>

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