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M Dixon 1 Web-Application Development Workshop
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Web-Application DevelopmentWorkshop
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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 (VB.Net, C#), JSP, PhP page– make your page interactive
• respond to events, read in form input and display dynamic output
– connect to a database – display data
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Admin
• Attendance Register:– log in to your profile
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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>
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Questions: Tags
How many tags are in the following:
<head><title>Hello</title></head>
<body>
<i>Soft</i><b>131</b>
</body>
4
6
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Questions: Elements
How many elements are in the following:
<head><title>Hello</title></head>
<body>
<i>Soft</i><b>131</b>
</body>
2
3
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HTML: Nesting Elements
• Nesting – puts one element inside another:
<b><i>Hello</i></b>
• Cannot overlap elements:
<b><i>Hello</b></i>
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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>
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HTML: page structure
<html> <head> <title>Test</title> </head> <body> <p>This is a test <b>page</b>.</p> </body></html>
head(info)
body(content)
• every HTML page has 2 sections:
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<html><head><title>Test</title></head><body><p>This is a test <b>page</b>.</p></body></html>
• 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>
head(is inside html)
title(is inside head)
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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)
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• 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)
attribute
start tag
start tag
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Questions: HTML attributes
Consider the following HTML:<a href="next.htm">Next Page</a>
a) Give an example of an attribute
b) Is the following an attribute? <img src=“House.jpg”>
c) How many attributes are there in: <font color=“green” size=3>
href="next.htm"
No (start tag)
2
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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)
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Example: Default.aspx (VB)<%@ Page Language="VB" %>
<script runat="server"> Sub Page_Load() End Sub</script>
<html> <head><title></title></head> <body> <form runat="server"> </form> </body></html>
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Example: Default.aspx (C#)<%@ Page Language="C#" %>
<script runat="server"> void Page_Load(){ };</script>
<html> <head><title></title></head> <body> <form runat="server"> </form> </body></html>
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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>
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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>
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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 + r("Title") + "<br>" Loop cn.Close() lblRes.InnerHtml = s End Sub</script><html> <head><title></title></head> <body> <p id="lblRes" runat="server"></p> </body></html>
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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 + r["Title"] + "<br>"; }; cn.Close(); lblRes.InnerHtml = s; }</script><html> <head><title></title></head> <body> <p id="lblRes" runat="server"></p> </body></html>
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Example PACS.jsp<%@page import="java.sql.*"%><%@page contentType="text/html"%><%Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");Connection cn = DriverManager.getConnection("jdbc:odbc:PACSdb", "", "");Statement st = cn.createStatement();ResultSet r = st.executeQuery("SELECT * FROM [Image] ORDER BY [Date] DESC;;");String html = ""; while(r.next()){ html += r.getString("Title") + "<br />"; } cn.close();%>
<!DOCTYPE html><html> <head><title></title></head> <body> <%=html%> </body></html>
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Example: PACS.php (MS Access)<?php $c = odbc_connect('PACSdb', '', ''); $r = odbc_exec($c, 'SELECT * FROM [Image] ORDER BY [Date] DESC;');
$s = ''; while(odbc_fetch_row($r)){ $s = $s . odbc_result($r, 'Title') . '<br>'; } odbc_close($c);?>
<html> <head><title></title></head> <body> <?php echo $s; ?> </body></html>
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Example: PACS.php (MySQL)<?php $c = mysql_connect('localhost', 'root', ''); mysql_select_db('PACS'); $q = mysql_query('SELECT * FROM [Image] ORDER BY [Date] DESC;'); mysql_close($c);
$s = ''; while ($r = mysql_fetch_array($q)){ $s = $s . $r['Title'] . '<br />'; } mysql_free_result($q);?>
<html> <head><title></title></head> <body> <?php echo $s; ?> </body></html>
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How to: Environment Settings
• If you install Visual Studio on your laptop:– Choose VB settings (same as my laptop):
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How to: Create Web Site1. Click File menu2. Click New Web Site menu item
3. Click Visual Basic item4. Click ASP.NET Empty Web Site item5. Click File System item6. Click Browse button
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How to: Create Web Site7. Navigate to your USB stick8. Type name in folder box
(e.g. \MySummer)9. Click Open button
10. Click Yes button11. Click OK button
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How to: Create Web page12. Click Add New Item button
(or right click project name)
13. Click HTML Page item14. Change page name
(e.g. MySummer.htm)15. Click Add button
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How to: Edit code
16. Click Source button
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How to: View page (Run)17. Click Play button
18. Click OK button (to enable debugging)
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How To: Create Web-Site Project1. Click File menu2. Click New Project menu item
3. Click Java Web item4. Click Web Application item5. Click Next button
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How To: Create Web-Site Project6. Type Project Name in textbox7. Click Browse button, and select location8. Click Next button
9. Select Apache Tomcat10. Select Java EE 611. Click Next button
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How To: Create Web-Site Project12. Clear all checkboxes13. Click Finish button
14. Edit code15. Run page (press Play button)
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• Start Menu
• Control Panel
• Administrative Tools
• Data Sources (ODBC)
• System DSN
• Add
How to: Create Data Source64bit Problem – No MS Access driverSolution:use C:\Windows\SysWOW64\odbcad32.exe
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How to: Create Data Source• Select MS Access Driver
• Click Finish
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How to: Create Data Source• Type Data Source Name
• Click Select button
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How to: Create Data Source
• Locate Database
• Select Database
• Click OK
• Click OK
• Click OK
