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Web-Application Development Workshop

Web-Application Development Workshop. Session Aims & Objectives. Aims to introduce the main concepts involved in creating web-applications Objectives, by end of this week’s sessions, you should be able to: create an html page create objects by adding html tags create an asp page

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Web-Application Development Workshop

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  1. Web-Application DevelopmentWorkshop

  2. Session Aims & Objectives • Aims • to introduce the main concepts involved in creating web-applications • Objectives,by end of this week’s sessions, you should be able to: • create an html page • create objects by adding html tags • create an asp page • make your page interactive • respond to events, read in form input and display dynamic output • connect to a database – display data • create a php page

  3. HTML: Elements & Tags Hyper-Text Markup Language text files – edited with notepad tags, e.g. <b><html></a> element = start tag + content + end tag bold: <b>This will be in bold</b> italic: <i>This will be in italic</i> work like brackets start/open <b> <i> end/close </b> </i>

  4. Questions: Tags How many tags are in the following: <head><title>Hello</title></head> <body> <i>Soft</i><b>131</b> </body> 4 6

  5. Questions: Elements How many elements are in the following: <head><title>Hello</title></head> <body> <i>Soft</i><b>131</b> </body> 2 3

  6. HTML: Nesting Elements • Nesting – puts one element inside another: <b><i>Hello</i></b> • Cannot overlap elements: <b><i>Hello</b></i>  

  7. Questions: HTML Elements Which of the following are valid elements? <center><b>Title</b> <head><title></title></head> <p>Good <b>morning.</p></b> <body><i>Soft</i><b>131</b></body>    

  8. HTML: page structure every HTML page has 2 sections: head (info) body(content) <html> <head> <title>Test</title> </head> <body> <p>This is a test <b>page</b>.</p> </body> </html>

  9. spaces are used to move lines in from left helps see structure Indentation <html> <head> <title>Test</title> </head> <body> <p>This is a test <b>page</b>.</p> </body> </html> <html> <head> <title>Test</title> </head> <body> <p>This is a test <b>page</b>.</p> </body> </html> head (is inside html) title(is inside head)

  10. HTML: Attributes Some tags need extra information to work: Anchor (hyper-link) element: <a href=“nextpage.htm”>Next Page</a> Image element: <img src=“Beach.jpg” /> Embedded object element: <embed src=“Music.mp3”></embed> attribute (page to jump to) attribute (filename of picture to display) attribute (filename of music to play)

  11. Attributes go inside the start tag: <a href=“nextpage.htm”>Next Page</a> not anywhere else <a>href=“nextpage.htm”Next Page</a> HTML: Attributes (where) start tag  attribute start tag 

  12. Questions: HTML attributes Consider the following HTML:<a href="next.htm">Next Page</a> Give an example of an attribute Is the following an attribute? <img src=“House.jpg”> How many attributes are there in: <font color=“green” size=3> href="next.htm" No (start tag) 2

  13. HTML Tags: Reference Lots of info available on-line, e.g.: http://www.willcam.com/cmat/html/crossref.html Short list of tags: <p>: new paragraph <b>: bold text <i>: italic text <a>: anchor (link) to another web page <img>: image/picture (.bmp, .jpg, .gif) <embed>: embedded object (.avi .mpg .wav .mp3)

  14. Example: My Summer My summer web-page 2006 My summer web-page 2008

  15. Visual Studio 2005

  16. Create New Web-site Select Empty web site Browse to D:\ and create folder

  17. Create New Web page

  18. Create New Web Page Select HTML Page Type filename

  19. Visual Studio Design view – see page as it will appear

  20. Visual Studio Source view – see HTML code

  21. View page (Run)

  22. Enable debugging Select Add new Web.config file

  23. Environment Settings Choose VB settings (same as my laptop):

  24. Example: Default.aspx <%@ Page Language="VB" %> <script runat="server"> Sub Page_Load() End Sub </script> <html> <head><title></title></head> <body> <form runat="server"> </form> </body> </html>

  25. Example: Date.aspx <%@ Page Language="VB" %> <script runat="server"> Sub Page_Load() lblDate.InnerHtml = Format(Now(), "ddd dd MMM yyyy") lblTime.InnerHtml = Format(Now(), "hh:mm:ss") End Sub </script> <html> <head><title></title></head> <body> <span id="lblDate" runat="server"></span> <span id="lblTime" runat="server"></span> </body> </html>

  26. Example: Temperature.aspx <%@ Page Language="VB" %> <script runat="server"> Sub btnCalc_ServerClick(ByVal s As Object, ByVal e As EventArgs) lblCel.InnerHtml = ((txtFah.Value - 32) * 5) / 9 End Sub </script> <html> <head><title>Temperature Conversion</title></head> <body> <form runat="server"> <input id="txtFah" type="text" runat="server" /> <input id="btnCalc" type="submit" value="Calculate" runat="server" onserverclick="btnCalc_ServerClick" /> <span id="lblCel" runat="server"></span> </form> </body> </html>

  27. Example: Loan.aspx <%@ Page Language="VB" %> <script runat="server"> Sub btnCalc_ServerClick(ByVal s As Object, ByVal e As EventArgs) lblPayAn.InnerHtml = (txtSal.Value - 15000) * 0.09 lblPayMo.InnerHtml = lblPayAn.InnerHtml / 12 End Sub </script> <html> <head><title>Student Loan</title></head> <body> <form runat="server"> <input id="txtSal" type="text" runat="server" /> <input id="btnCalc" type="submit" value="Calculate" runat="server" onserverclick="btnCalc_ServerClick" /> <span id="lblPayAn" runat="server"></span> <span id="lblPayMo" runat="server"></span> </form> </body> </html>

  28. Example: PACS_VB.aspx <%@ Page Language="VB" %> <%@ Import Namespace="System.Data.OleDb" %> <script runat="server"> Sub Page_Load() Dim cs As String = "Provider=Microsoft.Jet.OLEDB.4.0;" + _ "Data Source=" + Server.MapPath("PACS.mdb") + ";" + _ "Persist Security Info=False" Dim sql As String = "SELECT * FROM [Image] ORDER BY [Date] DESC;" Dim cn As New OleDbConnection(cs) Dim cmd As New OleDbCommand(sql, cn) Dim r As OleDbDataReader Dim s As String cn.Open() r = cmd.ExecuteReader() s = "" Do While r.Read() s = s + "<b>" + Format(r("Date"), "ddd dd MMM yyyy") + "</b> " s = s + r("Title") + "<br>" Loop lblRes.InnerHtml = s End Sub </script> <html> <head><title></title></head> <body> <p id="lblRes" runat="server"></p> </body> </html>

  29. Example: PACS_CS.aspx <%@ Page Language="C#" %> <%@ Import Namespace="System.Data.OleDb" %> <script runat="server"> void Page_Load(){ string cs = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Server.MapPath("PACS.mdb") + ";" + "Persist Security Info=False"; string sql = "SELECT * FROM [Image] ORDER BY [Date] DESC;"; OleDbConnection cn = new OleDbConnection(cs); OleDbCommand cmd = new OleDbCommand(sql, cn); OleDbDataReader r; string s; cn.Open(); r = cmd.ExecuteReader(); s = ""; while(r.Read()){ s = s + "<b>" + String.Format("{0:ddd dd MMM yyyy}", r["Date"]) + "</b> "; s = s + r["Title"] + "<br>"; }; lblRes.InnerHtml = s; } </script> <html> <head><title></title></head> <body> <p id="lblRes" runat="server"></p> </body> </html>

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