Difference between revisions of "OOP Class8"
(→Events in c# on the web) |
|||
Line 111: | Line 111: | ||
http://iam.colum.edu/oop/classsource/class9/postBack.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/postBack.aspx source] | http://iam.colum.edu/oop/classsource/class9/postBack.aspx [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class9/postBack.aspx source] | ||
− | + | {{ASPX c# commands}} | |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
==Home Work== | ==Home Work== | ||
Create a web page with a button that uses your class. | Create a web page with a button that uses your class. |
Revision as of 14:36, 2 November 2008
Contents
About aspx
Anatomy of an aspx page
Page Directive The page directive must be on the first line of an aspx page. It consists of Name/Value Pairs and sets parameters that will be used throughout the execution of the page ie. the language.
<%@ Page language="c#" debug="True" trace="False"%>
C# Code may be embedded in the page using script tags similar to javascript
<script language="c#" runat="server">
</script>
Notice the runat attribute is set to 'server'. This is what makes the code execute on the server rather than be parsed by the client.
Console applications start executing in the main method
<csharp>public static void Main() {}</csharp>
The .Net Framework can also execute on the web. Rather than having a Main method a web page starts it's execution with a method called Page_Load
<csharp>public Page_Load { }</csharp>
There are actually several method that are executed in an aspx page.
http://samples.gotdotnet.com/quickstart/aspplus/
Simple Aspx Page
http://iam.colum.edu/oop/classsource/class8/Aspx/hello.aspx hello.aspx
http://iam.colum.edu/oop/classsource/class8/Aspx/hello2.aspx hello2.aspx
http://iam.colum.edu/oop/classsource/class8/Aspx/Label.aspx Label.aspx
In class Build three hello aspx pages similar to the ones above
Dogs on the web
HTML and HTTP
Http is a stateless protocol. There is mo mechanism built in to the protocol that allows the server to remeber clients or requests. An http simply responds to http verbs GET, POST, PUT, DEL, TRACE etc. contained in RFC 2068 HTTP/1.1
regular html forms post information using forms in 2 ways with a get or a post http request.
Get
- Get send information to the server using the URI. Limited to 1024 character in some browsers and servers.
Example http://iam.colum.edu/oop/classsource/class9/simpleGet.html simpleGet.html - source
The simpleGet.html pages form has the action of 'simpleGet.aspx' this mean that when the form is submitted the browser will request the 'simpleGet.aspx' with whatever parameters are in the form. Since the method = get these pararmeters will show up are query string parameters
URI and querystring parameters
URI - Universal Resource Identifier http://src.doc.ic.ac.uk/computing/internet/rfc/rfc1630.txt RFC1630
Http URI
Protcol | Host | Port | Path | File | Fragment identifier | Querystring |
---|---|---|---|---|---|---|
http:// | info.cern.ch | :8000 | /imaginary/test/ | file.html | #link | ?test=yes |
Post
- Post posts the variables in the HTTP Header.
Example http://iam.colum.edu/oop/classsource/class9/simplePost.html simplePost.html - source
FirstName: LastName: Header Name Value HttpMethod GET Connection keep-alive Keep-Alive 300 Accept text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Accept-Encoding gzip,deflate Accept-Language en-us,en;q=0.5 Cookie ASP.NET_SessionId=ezfgw255ix0zd5yogj3eawej Host imdev Referer http://imdev/infod/jeff/ User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1
REST
- Representational state transfer
https://www.ibm.com/developerworks/webservices/library/ws-restful/
http://www.infoq.com/articles/rest-introduction
http://iam.colum.edu/oop/classsource/class9/htmlForms.html htmlForms.html - source
Courses on the Web
Response Object
Response.Write()
http://iam.colum.edu/oop/classsource/class10/Response/Response1.aspx Response1.aspx - source
Response.End()
http://iam.colum.edu/oop/classsource/class10/Response/Response2.aspx Response2.aspx - source
Response.Clear()
http://iam.colum.edu/oop/classsource/class10/Response/ResponseClear.aspx ResponseClear.aspx - source
Response.Flush()
http://iam.colum.edu/oop/classsource/class10/Response/ResponseFlush.aspx ResponseFlush.aspx - source
Debugging with response object
Using the response buffer can be extreemely usefull for debugging. Sometime you may have to setup a small debug system to help catch errors in object that do not inherit from System.UI.Page.
Response.Flush()
http://iam.colum.edu/oop/classsource/class10/Response/ResponseDebug.aspx ResponseDebug.aspx - source
Home Work
Convert one of your classes to work as an aspx page.
Have a nice break....
Web Forms
Examples of Web Forms
http://iam.colum.edu/oop/classsource/class9/aspForms.aspx aspForms.aspx - Source
todo examples of all the html elements and how they react to form submits
Persisting Data
POST and GET
http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class9
an asps page posting to itself
GET
Simple get page http://iam.colum.edu/oop/classsource/class9/simpleGet.html source
http://iam.colum.edu/oop/classsource/class9/simpleGet.aspx source
POST
Simple post page http://iam.colum.edu/oop/classsource/class9/simplePost.html source
http://iam.colum.edu/oop/classsource/class9/simplePost.aspx source
Simple post page http://iam.colum.edu/oop/classsource/class9/simplePostValues.html source
http://iam.colum.edu/oop/classsource/class9/simplePostValues.aspx source
ASP POSTBACK
http://iam.colum.edu/oop/classsource/class9/postBack.aspx source
Home Work
Create a web page with a button that uses your class.