cos 381 day 26. agenda capstone projects are due may 10 at 1pm i will be covering asp.net from the...
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Agenda
Capstone projects are DUE May 10 at 1PM I will be covering ASP.NET from the handouts There will be one lecture on Database access Quiz 4 on May 4
ASP.NET and Database Access Assignment 7 (final one) is posted and is Due on
May 3 at Midnight Create a complex ASP.NET page http://perleybrook.umfk.maine.edu/samples/
assign7/UMFKorder.aspx
ASP.NET
Where ASP used interpreted languages ASP.NET uses complied languages ASP example (code) Same in ASP.NET (code)
ASP.NET uses many languages We will use C# Another example (code)
NEW Features of ASP.NET
The following are not part of ASP or any other traditional Web programming languages Server Controls Validation Controls List Controls and Rich Controls HTML Server Controls User and Custom Controls Web Services Integration
Server Controls
Programmable; prepackaged server code program code written to perform dynamic functions <asp:tagname …> Converted to HTML by server Look the same as standard from
elements but can be dynamically control by server side code at run-time
Example server controls (code)
Validation Controls
Used to validate data users enter into from elements Make a field required Compare against range of inputs Compare two values
Validation controls process data BEFORE a form is submitted
List Controls and Rich Controls
List controls are used to iterate, process and display dynamic data Database query Program array
Rich controls are complex components Calendar Ad Rotator
User and Custom Controls
User Controls Mini-ASP.NET pages Included in other ASP.NET pages
Custom Controls Written entirely in another language
like C++, C# VB
Precompiled and added to ASP.NET
Web Service Integration
Small Programs to which you can call functions and get results
Transfer data using XML over HTTP AN Example
US Postal Service has web service to output all ZIP Codes
In order to include ZIP Codes in your ASP.NET application you simply poll the USPS Web Service
Web Service
HTTP Response
HTTP Request
Client PCWebserver
SOAP-CapableBrowser
WebService
--Interface
PropertiesMethodsSOAP Message
Using XML Syntax
Web Service
Similarities to ASP
ASP pages coexist with ASP.NET Cannot share session information
Still have Response and Request objects All info requested with a web page
Form data Query Strings
All info returned with a webpage
Components of .NET
3 major parts Common language runtime (CLR)
A virtual machine that runs all .NET programs Run-time language is Microsoft Intermediate
language (MSIL) Uses JIT Compilation
Common type system (CTS) Standard set of types
Value types (int, char…) Reference types for objects
Common naming convention (CLS) Class Library
Predefined code packaged as classes All .NET classes or part of System namespace
Class Libraries
Namespaces Hierarchical naming convention Matches class inheritance tree
Common Namespaces in .NET System root namspace System.data System.xml System.net System.security System.web
Writing C# code in .NET
Object oriented Class
public class Car { } Object
Car c = new Car(): Member variable
private int Gas; Method
private void Drive() {} Property
Public int Gasoline { get {return Gas; } set {Gas=value;}} Overloading
Method with different parameter list Inheritance
The power of OOP
Getting Started with .NET
Installing .NET Need .NET SDK
Loaded with Visual Studio .NET Available under MSDNAA
Need IIS Personal edition or Server
Microsoft Data Access Components (MDAC)
For data base access Service packs and updates
.NET Framework SDK
Assemblies ASP.NET pages Executed in CLR
Metadata Data about data Provides location of class definitions. How to
load classes and any defines attributes Global Assembly Cache
Centralized locations for assemblies
Working with Dreamweaver
Chapter 3 of text provides a good overview Only issue is that it assumes that you
have a web server available on your Desktop..we do in N-105. You may not have on your home computer
Setting up Dreamweaver MX to Create ASP.NET Applications
Open Dreamweaver MX. Select Site > New Site… from the Menu bar to create a
new site. On the Basic tab, enter the following information,
clicking Next at the bottom of each screen: Name: MyASPNET Yes, I want to use a server technology.
Select ASP.NET C# as the server technology. Edit and then upload to remote testing server, storing
your files at H:\asp. URL to browse to the root of your site
http://perleybrook.umfk.maine.edu/classes/cos381/”last name”.
No, do not copy files when I am done editing. Click Done to create an initial cache of your site. Lets do this “Step by Step”
Building Dynamic Pages
Update page based on external conditions
runat=“server” means that a control can be manipulated
Let’s modify our page to display an user input ADD asp:textbox ADD asp:button
About Post Back
Form “post’ back to themselves No need to reload form Makes the form interactive
isPostBack is true when Something control has caused the form
to be to be sent to the server and the form is “reloaded”
Problem is that you allways return to the same form page
Form vs Query Srting
In CGI programming we used the Query String to collect data from a form and pass it to our script Uses method=“get” Security/performance issue
In ASP.Net We use the action=“post” and read our values
from the response object Response.Form[“txtFirstName”]
We use get when we want to load a different page and pass data to the page
<a ref=“http://url/webform.aspx?data=stuff” >stuff</a>
Examples ASP.NET
All examples from class are at http://perleybrook.umfk.maine.edu/samples/AS
PdotNet/script.htm Today’s Example (so far)
WebForm1 (code)
Moving between pages
Since Web Form Post Back ….how do you go to another web Page? Response.Redirect(“Url”);
If you don’t want to finish processing the page you are on Response.Redirect(“Url”, true);
The hidden form element __VIEWSTATE gets lost
Session Variables
To move data between different Web forms you can use Session Variables To Set a Session Variable (original Web Form
Session[“aVariable”] = “some data”; To get a Session Variable (second Web Form)
lblSomeLable.Text = Session[“aVariable”].ToString();
String str = Session[“aVariable”].ToString(); Example (code1) (Code2)
Drop Down List
Coding Drop Downs In Body section
<asp:dropdownlist ID="dblSampleList" runat="server">
<asp:listitem>List Item 1</asp:listitem></asp:dropdownlist>
To add a item dynamicallydblSampleList.Items.Add("List Item 2");dblSampleList.Items.Add("List Item 3");
Example (code)
Binding Data
Used for binding data from a Database or an array to a controls at run time Another way to add list items Bind values to variables
Two Styles for Binding Data exist Textbook Error
References to BindData() should be change to DataBind()
Binding Data
First Style <%# variable %>
In body of HTML Type in or use ASP.NET Bound Data Icon
in Dreamweaver Must call Page.DataBind(); in Page_load
function (note error in text book!) Will be replaced by value of variable
Second Style
Binding Data
Second Style In Page_Load Function
someList.DataSource = someList; Page.DataBind();
Example (code)
Event Handling in ASP.NET
Events are messages sent out by objects Different objects – Different messages
In ASP.NET events occur when the server detects an event page-Level events
Occur when users visits a web page Control events
Occur when a user manipulates an ASP.NET control
Page Events
Web Form trigger 11 events when loaded (in order)1. Initialization (Page_Init)2. Load View State3. Post Back Data Processing4. Page Load (Page_Load)5. Post Back Change Notification6. Post Back Event Processing7. Pre-rendering (Page_PreRender)8. Same view State9. Rendering10. Disposing11. Unload
Page Level Events
These events do not need to be registered Most common Used Page Event is
Page_Load<script runat="server">protected void Page_Load(Object Src, EventArgs E){ if (!PostBack) DataBind();} </script>
Example (code)
Control Events
Must have registered Handlers Use Delegates which listen for events
and then delegating responsibility for the event to the assigned handler
Generally event handlers (like Page_Load) have two parameters
Object src The object which created the event
EventArgs E Specific information about the event
Creating a handler for a ASP.NET Control
ASP.NET Control must be in a Web Form that is set to runat=‘server”
Use Dreamweaver Wizard
Control Events
The Dreamweaver wizard will register the event but you still need to write the handler code Between <script> tags in Head
void btnTest_OnClick( Object Src, EventsArgs E){
Some C# code }
Example (Code)
Adding Controls and Events Programmatically
Between <script> tags in head Button btnTest = new Button(); btnTest.Text = “daButton”; btnTest.Click += new
EventHandler(this.btnTest_OnClick); samePanel.Controls.Add(“btnTest”); Make sure you write the
btnTest_Onclick functions Example (code)
Complex Controls
Have lots of functionality; sometimes called rich controls
We will look at two complex controls Ad Rotator File upload
You can create your own Complex Controls (chap 10 & 11 in text)
AD Rotator
Places Different images in your Web Form every time someone loads the page. Images are licked to a web site 3 Parts
Images The ASP.NET Ad Rotator Control A XML configuration file
Example (Code)
XML config File
<?xml version="1.0" encoding="iso-8859-1" ?> <Advertisements>
<Ad><ImageUrl>*.jpg</ImageUrl> <NavigateUrl>URL</NavigateUrl> <AlternateText>text</AlternateText> <Impressions>50</Impressions><Keyword>Macromedia</Keyword>
</Ad><Ad>
<ImageUrl>*.jpg</ImageUrl> <NavigateUrl>UrL</NavigateUrl><AlternateText>Text</AlternateText><Impressions>30</Impressions> <Keyword>Microsoft</Keyword>
</Ad></Advertisements>
example
Adding The Ad Rotator Control
Use Dreamweaver wizard More tags icon Under ASP.NET tags use asp:adrotatoor
Web Form Validation
Input fields need to be checked Check for errors before using the data in a
program or putting into a database We can check for
Existence Format Range of vales Data type
ASP.NET includes validation controls that automatically provide form field validation with little or no extra coding
Preprogrammed Validators
Does both client side and server side validation of data DHTML
CSS JavaScript
ASP.NET includes 5 preprogrammed Validators Required field Range Compare Regular expression Custom
Value Based Validators
Required Text Validators only require that some text is entered but you may want to check to actual text entered Compare against
Value (compare validator) Type (compare validator) Another control (compare validator) A regular expression (regular expression
validator) A range of values (range validator) Other conditions (custom validator)
Regular Expression
Same as JavaScript and Perl \w is alpha char \d is decimal char * zero or more + one or more ? Zero or one . Matches any character except newline [] range of characters [A-Z] upper case \* matches * \w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)
Matches e-mails
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