Application Development

Monday, November 5, 2007

jQuery: Exception... "'Permission denied to call method XMLHttpRequest.open' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: ...

I received below error message in firebug when i try to use jQuery Ajax call

var html = $.ajax({
url: "http://www.xxx.com",
async: false
}).responseText;

Where http://www.xxx.com is different domain from my current site.

Exception... "'Permission denied to call method XMLHttpRequest.open' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "" data: no]

As far as my understanding, this is not allowed. In order to have the similar result, use Cross Domain getJSON or you can check on my sample in other post which work on cross domain ajax.

Ajax treat http://www.xxx.com and http://xxx.com as two different entry. There are different between url with www and without www. To solve this problem, use location.host to get the url that use by visitors.

example:
var html = $.ajax({
url: "http://"+location.host+ "/Realtime.ashx" + "?PostID=" + PostID,
async: false
}).responseText;

Thursday, November 1, 2007

Dynamic CSS reference in ASP.NET

This sample allowed me to dynamic add CSS link to my ASP.NET page. If css provided via querystring, the page will link to provided css. If not provided then if will refer to the default css.

protected void Page_Load(object sender, EventArgs e)
{
string mycss;

if (Request.QueryString["mycss"] != null)
{
if (Request.QueryString["mycss"].ToString().Trim().Length > 0)
{
mycss= Request.QueryString["mycss"].ToString().Trim();
}
else
{
mycss= "~/default.css";
}
}
else
{
mycss= "~/default.css";
}
AddLinkedStyleSheet(this, mycss);
}

public static void AddLinkedStyleSheet(Page page, string stylesheet)
{
HtmlLink link = new HtmlLink();
link.Href = page.ResolveUrl(stylesheet);
link.Attributes["text"] = "text/css";
link.Attributes["rel"] = "stylesheet";
page.Header.Controls.Add(link);
}

credit give to Rich Sturim

Wednesday, October 31, 2007

window.location.search

window.location.search is a very useful script that able to return all querystring for further usage like pass to another page/AJAX.

To test on the usage, save below page as locationsearch.htm. To see the result, add querystring to the page called: locationsearch.htm?p=testing&l=javascript

<html>
<head>
<script language="JavaScript">

function onload()
{
alert(window.location.search);
}

</script>
</head>

<body onLoad="onload()">

</body>
</html>

Monday, October 29, 2007

Top 100 living geniuses


1=	Albert Hoffman	(Swiss)	Chemist	27
1=	Tim Berners-Lee	(British)	Computer Scientist	27
3	George Soros	(American)	Investor & Philanthropist	25
4	Matt Groening	(American)	Satirist & Animator	24
5=	Nelson Mandela	(South African)	Politician & Diplomat	23
5=	Frederick Sanger	(British)	Chemist	23
7=	Dario Fo	(Italian)	Writer & Dramatist	22
7=	Steven Hawking	(British)	Physicist	22
9=	Oscar Niemeyer	(Brazilian)	Architect	21
9=	Philip Glass	(American)	Composer	21
9=	Grigory Perelman	(Russian)	Mathematician	21
12=	Andrew Wiles	(British)	Mathematician	20
12=	Li Hongzhi	(Chinese)	Spiritual Leader	20
12=	Ali Javan	(Iranian)	Engineer	20
15=	Brian Eno	(British)	Composer	19
15=	Damian Hirst	(British)	Artist	19
15=	Daniel Tammet	(British)	Savant & Linguist	19
18	Nicholson Baker	(American	Writer	18
19	Daniel Barenboim	(N/A)	Musician	17
20=	Robert Crumb	(American)	Artist	16
20=	Richard Dawkins	(British)	Biologist and philosopher	16
20=	Larry Page & Sergey Brin	(American)	Publishers	16
20=	Rupert Murdoch	(American)	Publisher	16
20=	Geoffrey Hill	(British)	Poet	16
25	Garry Kasparov	(Russian)	Chess Player	15
26=	The Dalai Lama	(Tibetan)	Spiritual Leader	14
26=	Steven Spielberg	(American)	Film maker	14
26=	Hiroshi Ishiguro	(Japanese)	Roboticist	14
26=	Robert Edwards	(British)	Pioneer of IVF treatment	14
26=	Seamus Heaney	(Irish)	Poet	14
31	Harold Pinter	(British)	Writer & Dramatist	13
32=	Flossie Wong-Staal	(Chinese)	Bio-technologist	12
32=	Bobby Fischer	(American)	Chess Player	12
32=	Prince	(American)	Musician	12
32=	Henrik Gorecki	(Polish)	Composer	12
32=	Avram Noam Chomski	(American)	Philosopher & linguist	12
32=	Sebastian Thrun	(German)	Probabilistic roboticist	12
32=	Nima Arkani Hamed	(Canadian)	Physicist	12
32=	Margaret Turnbull	(American)	Astrobiologist	12
40=	Elaine Pagels	(American)	Historian	11
40=	Enrique Ostrea	(Philippino)	Pediatrics & neonatology	11
40=	Gary Becker	(American)	Economist	11
43=	Mohammed Ali	(American)	Boxer	10
43=	Osama Bin Laden	(Saudi)	Islamicist	10
43=	Bill Gates	(American)	Businessman	10
43=	Philip Roth	(American)	Writer	10
43=	James West	(American)	Invented the foil electrical microphone	10
43=	Tuan Vo-Dinh	(Vietnamese)	Bio-Medical Scientist	10
49=	Brian Wilson	(American)	Musician	9
49=	Stevie Wonder	(American)	Singer songwriter	9
49=	Vint Cerf	(American)	Computer scientist	9
49=	Henry Kissinger	(American)	Diplomat and politician	9
49=	Richard Branson	(British)	Publicist	9
49=	Pardis Sabeti	(Iranian)	Biological anthropologist	9
49=	Jon de Mol	(Dutch)	Television producer	9
49=	Meryl Streep	(American)	Actress	9
49=	Margaret Attwood	(Canadian)	Writer	9
58=	Placido Domingo	(Spanish)	Singer	8
58=	John Lasseter	(American)	Digital Animator	8
58=	Shunpei Yamazaki	(Japanese)	Computer scientist & physicist	8
58=	Jane Goodall	(British)	Ethologist & Anthropologist	8
58=	Kirti Narayan Chaudhuri	(Indian)	Historian	8
58=	John Goto	(British)	Photographer	8
58=	Paul McCartney	(British)	Musician	8
58=	Stephen King	(American)	Writer	8
58=	Leonard Cohen	(American)	Poet & musician	8
67=	Aretha Franklin	(American)	Musician	7
67=	David Bowie	(British)	Musician	7
67=	Emily Oster	(American)	Economist	7
67=	Steve Wozniak	(American)	Engineer and co-founder of Apple Computers	7
67=	Martin Cooper	(American)	Inventor of the cell phone	7
72=	George Lucas	(American)	Film maker	6
72=	Niles Rogers	(American)	Musician	6
72=	Hans Zimmer	(German)	Composer	6
72=	John Williams	(American)	Composer	6
72=	Annette Baier	(New Zealander)	Philosopher	6
72=	Dorothy Rowe	(British)	Psychologist	6
72=	Ivan Marchuk	(Ukrainian)	Artist & sculptor	6
72=	Robin Escovado	(American)	Composer	6
72=	Mark Dean	(American)	Inventor & computer scientist	6
72=	Rick Rubin	(American)	Musician & producer	6
72=	Stan Lee	(American)	Publisher	6
83=	David Warren	(Australian)	Engineer	5
83=	Jon Fosse	(Norwegian)	Writer & dramatist
83=	Gjertrud Schnackenberg	(American)	Poet	5
83=	Graham Linehan	(Irish)	Writer & dramatist	5
83=	JK Rowling	(British)	Writer	5
83=	Ken Russell	(British)	Film maker	5
83=	Mikhail Timofeyevich Kalashnikov	(Russian)	Small arms designer	5
83=	Erich Jarvis	(American)	Neurobiologist	5
91=.	Chad Varah	(British)	Founder of Samaritans	4
91=	Nicolas Hayek	(Swiss)	Businessman and founder of Swatch	4
91=	Alastair Hannay	(British)	Philosopher	4
94=	Patricia Bath	(American)	Ophthalmologist
94=	Thomas A. Jackson	(American)	Aerospace engineer	3
94=	Dolly Parton	(American)	Singer	3
94=	Morissey	(British)	Singer	3
94=	Michael Eavis	(British)	Organiser of Glastonbury	3
94=	Ranulph Fiennes	(British)	Adventurer	3
100=.	Quentin Tarantino	(American)	Filmmaker	2

Extract from http://www.telegraph.co.uk/

Saturday, October 27, 2007

Hot topic in town - Facebook

Plan starting to develop a facebook application, not sure where to start and i found this wiki really help .... have a look .. Facebook for .Net developers ..
http://wiki.developers.facebook.com/index.php/ASP.NET

Thursday, October 25, 2007

System.Net.Mail.SmtpFailedRecipientsException

I'm migrating my existing application to a new application server. When test on the suggestion box which involve SMTP, i get below error message:

System.Net.Mail.SmtpFailedRecipientsException: Unable to send to all recipients. ---> System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: No such user here --- End of inner exception stack trace --- at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message)

Few things that i test on new server:

Install SMTP - check on document provided
Testing with the Pickup directory
You can also compose a simple e-mail text file based on the SMTP specifications (RFC 822). Here is the content of a sample text file typed in Notepad:

From: myname@mydomain.com
To: someone@somedomain.com
Subject: testing
This is the test message body.

Simply copy or move the text file into the Pickup directory where SMTP was installed. (The default path should be "\Inetpub\mailroot\Pickup" but if you have Exchange installed then the path will be "\Program Files\Exchsrvr\Mailroot\Vsi 1\Pickup".)
Set Relay Restrictions in the IIS admin. Put your app server IP Address/Domain Name in the Relay Resctictions.
After all, remember to restart your machine. Restart IIS or Virtual SMTP server won't help. Restart the server do the best.

Done

CS0030: Cannot convert type 'ASP.login_aspx' to 'System.Web.UI.WebControls.Login'

Facing an error below and found that i'm not alone.

Posted by Microsoft on 9/29/2005 at 4:46 PM
If you have used a Page that effectively uses a codebehind classname that is the same as say the Login control, that is Login, e.g. your page was called Login.aspx, then when you pre-compile (publish) the web site as an updateable web site, the aspx is retained and tries to compile against a type called Login in the code behind.

Server Error in '/' Application.
--------------------------------------------------------------------------------
Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0030: Cannot convert type 'ASP.login_aspx' to 'System.Web.UI.WebControls.Login'

Source Error:

Line 118: public login_aspx() {
Line 119: string[] dependencies;
Line 120: ((Login)(this)).AppRelativeVirtualPath = "~/Login.aspx";
Line 121: if ((global::ASP.login_aspx.@__initialized == false)) {
Line 122: dependencies = new string[6];

Source File: c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\3e0e0b67\701b7b2\App_Web_login.aspx.cdcab7d2.fhpe1ais.0.cs Line: 120

Many post and solutions can get from the internet. Among them is

Rename Login.aspx to others name like signin.aspx
Try using a classname for your codebehind and defined in the inherits that does not clash with a type in System.Web, e.g. LoginPage, or qualify the class and therefore the inherits statement with a namespace, e.g.<%@ page ... inherits="theNs.Login" %.namespace theNs { public partial class Login : System.Web.UI.Page { .. } }
uncheck “Allow this precompiled site to be updatable” when Publish Web Site in Visual Studio 2005.

Solution no. 3 is good for me. Less work and works 100%.

Wednesday, October 24, 2007

A generic error occurred in GDI+.

Error Message received when try to upload picture to my web application:

Server Error in '/' Application.

A generic error occurred in GDI+.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ExternalException (0x80004005): A generic error occurred in GDI+.]
System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, EncoderParameters encoderParams) +396978
System.Drawing.Image.Save(String filename, ImageFormat format) +69
Account.WarpImageDimensions(String filePath, String fileName, Bitmap imageToSave) +301
Account.ImageButton1_Click(Object sender, ImageClickEventArgs e) +350
System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) +86
System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +115
System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746

Solve this by:
1. check the permission for upload folder
2. check the correct upload path

problem solved.

Select top xx from DataTable

I was trying to figure out how to sort and select top 20 from a DataTable. Understand from the reading, DataTable have no "select top" feature. Some suggest use below method

DataTable outputTable = SourceTable.Clone();
for(int i=0;i<20;i++)
outputTable.ImportRow(SourceTable.Rows[i]);

In my case, i need to sort my DataTable oldTable and select top 20 after the sorting. I use DataView dView to sort it and copy it into a new DataTable newTable. For the display purpose, i use "for loop" to select top 20 from the new DataTable newTable.

Sample Code:

int maxDisplay = 20;
DataView dView = oldTable.DefaultView;
dView.Sort = " [Count] DESC ";
DataTable newTable = dView.ToTable();

int dCount = newTable.Rows.Count;
if (maxDisplay > dCount )
maxDisplay = dCount ;
if (dCount > 0)
{
for (int i = 0; i < maxDisplay ; i++)
{
xxxxxx;
xxx + newTable.Rows[i]["name"].ToString();
xxxxxx;
}
}

text wrapping in table : Firefox and IE

My case:
I'm using C# StringBuilder object to generate a long string with all blog Tags with link and without any white space between them. I've tried below code.

.hardbreak
{
width: 190px;
white-space: pre-wrap; /* css-3 */
white-space: -moz-pre-wrap; /* Mozilla, since 1999 */
white-space: -pre-wrap; /* Opera 4-6 */
white-space: -o-pre-wrap; /* Opera 7 */
word-wrap: break-word; /* Internet Explorer 5.5+ */
}
<table style="TABLE-LAYOUT: fixed; WIDTH: 210px" cellpadding="'3'">
<tr>
<td class="hardbreak" style="WIDTH: 200px">
xxxx return StringBuilder code over here xxxx
</td>
</tr>
</table>

Result in IE: working fine. Even the word can be wrapped.

Result in Firefox: not working

this give me a problem.

I've try to google around and finally i found that i should insert a white space " " after every single tag before append to StringBuilder. Surprisingly, without using the class above, my problem solved.

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Monday, November 5, 2007

jQuery: Exception... "'Permission denied to call method XMLHttpRequest.open' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: ...

Thursday, November 1, 2007

Dynamic CSS reference in ASP.NET

Wednesday, October 31, 2007

window.location.search

Monday, October 29, 2007

Top 100 living geniuses

Top 100 living geniuses

Saturday, October 27, 2007

Hot topic in town - Facebook

Thursday, October 25, 2007

System.Net.Mail.SmtpFailedRecipientsException

CS0030: Cannot convert type 'ASP.login_aspx' to 'System.Web.UI.WebControls.Login'

Wednesday, October 24, 2007

A generic error occurred in GDI+.

Select top xx from DataTable

text wrapping in table : Firefox and IE