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Thai characters and AJAX

Posted on 2007-11-28
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Last Modified: 2008-02-01
Hi all,

Our JSP application accepts Thai as the input and will display back to the user their input. Those inputs will be stored in to the Database. The application is running on Resin. Not long ago, we implemented Ajax into our application and the Thai characters is not being stored properly. It was stored and displayed as ?????.

Is it caused by Ajax? What kind of encodings is required? Currently, in the jsp page, we specify <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">


Thanks all for the help.

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Question by:rospcc
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by:objects
objects earned 20 total points
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>  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

try changing it to utf8
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by:rospcc
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tried that and it doesnt work
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by:TimYates
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Can you add some debug to check it is the ajax -> java boundary that is causing the issues?

How is the ajax implemented?  Are you using something like DWR?

Have you seen this thread:  http://lists.evolt.org/pipermail/javascript/2006-August/011076.html

It talks about PHP, but the same problem...

They ended up encoding their data with a Base64 implementation http://www.webtoolkit.info/javascript-base64.html

But as that thread says, that isn't finding the problem...it's just working round it

Tim
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by:Michel Plungjan
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And if you set the content charset to utf-8 the DATA needs to be utf-8 too and not windows-874, ISO-8859-11, tis-620  or whatever

http://www.fileformat.info/info/unicode/block/thai/utf8test.htm
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by:Manish
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check database, what values it is storing?
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by:rospcc
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We are Ms SQL 2000. The column is set to NVarchar type.

Without going through AJAX, the Thai characters can be stored and viewed correctly. In the database, it's being stored as something like this: &#80&#97&#115&#115&.

However, when we let the saving goes through AJAX, the Thai characters was stored as ???? instead. Is there any proceesing or conversion done within the AJAX layer?
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by:mrcoffee365
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You should post your Ajax code.

The HTML content type -- which if you've left it as iso-8859-1 is wrong: it should be utf-8 as "objects" said -- matters for setting variables in Javascript.  If your data is being handed around as Javascript vars, then that might be why the values are incorrectly encoded when they are submitted through the Ajax calls.
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by:rospcc
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Yes. The data is being passed to Javascript. Is that the cause of the problem? Any encoding we can specify in javascript?
function confirmSave(type, messageToDisplay)

{

	xmlHttp=GetXmlHttpObject()

	if (xmlHttp==null)

	{

	alert ("Browser does not support HTTP Request")

	return

	}

	

	var clicked = false;

	

	if(confirm(messageToDisplay)) {

		clicked = true;

	} else {

		return false;

	}

	

         var url	="GetQuestions.jsp"

	url=url+"?go=3&finish=" + type

	if (document.getElementById( "qeustionID" ) != null && document.getElementById( "questionID" ).value != "") {

		var questionIDtemp = "" + document.Question.questonID.value

		var questionID = questionIDtemp.split(",")

		

		for(i=0; i < questionID.length; i++) {

			if (document.getElementById( questionID[i] ).value != "") {

				url=url+"&" + questionID[i] + "=" + document.getElementById( questionID[i] ).value;

			}

		}

	}

}

Open in new window

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by:mrcoffee365
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It looks as if you are not putting quotes around your values in the Javascript.  If you don't explicitly put quotes around them, and the values look possibly numeric, Javascript attempts to read the values as numbers, which is probably where the ???? is coming from.
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by:rospcc
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Currently, we store the thai characters as &#80&#97&#115&#115&. If we use utf-8, it will store the Thai characters as it is.  The problem will be solved once we changed how the Thai characters are stored in our DB. However, we are not planning to do so in the near future because it required major revamping.

With iso-8859-1, we have checked that ??? problem occured when we read the parameters from the javascript url. When we called request.getParameter() of one of the url parameters, it will return ????. If we did not read from the url, i.e. calling request.getParameter() of the field of the form itself, it will return &#80&#97&#115&#115&.

With utf-8, when we called request.getParameter() of one of the url parameters and calling request.getParameter() of the field of the form itself, it will return the thai characters.  However, we do not want to store characters. We need to store the thai characters as &#80&#97&#115&#115&.

My question is how can i convert thai characters to this from &#80&#97&#115&#115& using javascript?
We are thinking to convert the thai characters in javascript before passing it as parameter.

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mrcoffee365 earned 440 total points
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>>thai characters as &#80&#97&#115&#115&.

Those characters are encoded "Pass", which is not Thai.  To help everyone debug, we should probably be looking at real Thai characters, for example:
&#3607;&#3615;&#3614;&#3629;&#3619;&#3639;

If you're passing your Thai value as a parameter on the URL, then you should encode the value.  It doesn't look as if you're doing that.  

If you still want to turn your input Thai chars into the Unicode entity representations (e.g., &#[1234];) in the Javascript before passing them as a parameter, then this person has written a set of Javascript functions to do that:
http://www.kadifeli.com/fedon/utf.htm

Do a view source to see the functions he has created.
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by:rospcc
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Thank you mrcoffee365. I have managed to store my Thai characters correctly by encoding the Thai characters before passing it as parameters.

Just wondering, is there other better way of doing it? If there isnt then i will close this question tomorrow evening.
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by:mrcoffee365
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Glad to help.
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