javascript change character encoding

Posted on 2007-10-01
Medium Priority
Last Modified: 2008-01-09

I want to have a selection option on my website that allows the user to change the character encoding of the page in the same way as would happen if they changed the settings in their browser.

example. in firefox to change the encoding of a page i select VIEW->CHARACTER ENCODING-> UTF-8

I would like to have this as an option on my website
* utf-8

The reason for this is that the site will be recieving data in theses formats and when the user views the page some of the characters will not be visible until the character encoding is changed.  

Since the data displayed will come from a post form it would be much more convieninet to use the browser to change the encoding and better to have a button than trying to teach the users how to use thier borwsers.

I dont want to have to re-retrieve the data from the database whenever anybody changes their encoding.
Question by:ussher
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LVL 75

Expert Comment

by:Michel Plungjan
ID: 19997202
Why not code everything in UTF-8 and be done with it?

Otherwise if possible, you need to change the meta tag - not even sure if that will do it.
LVL 75

Expert Comment

by:Michel Plungjan
ID: 19997255
Does not seem writeable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
  <meta http-equiv="content-type" content="text/html; charset=windows-1250">
  var saveCharset = document.getElementsByTagName('meta')[0].content.split('charset=')[1];
  var charSets = new Array(
  function changeMeta(idx) {
    var met = document.getElementsByTagName('meta');
    var newSet = met[0].content.replace(saveCharset,charSets[idx]);
    alert('Changed to '+document.getElementsByTagName('meta')[0].content.split('charset=')[1])
//    document.body.innerHTML=document.body.innerHTML;
    return false;
  <body >
  <a href="#" onClick="return changeMeta(0)">1250</a><br>
  <a href="#" onClick="return changeMeta(1)">8859-1</a><br>
  <a href="#" onClick="return changeMeta(2)">UTF-8</a><br>


Author Comment

ID: 19997313
Hi mplungjan,

the interface is in utf but the problem is with the incoming data.  It is a web advertisment tracking script.

So if the site that the link is coming from is in shift_jis or euc-jp then when the link is clicked on it sends data to the tracking script in the encoding that the page was.

So when i try to display the link in my site which is encoded in utf8 then the id tag gets screwed up.


The 'something_in_japanese' is identifying data for this ad.
something_in_japanese // placed on a UTF8 site goes into the database clear.
something_in_japanese // placed on a EUC-JP site goes into the database messed up.
something_in_japanese // placed on a SHIFT-JIS site goes into the database messed up.

so when i view the reports i get output like

something_in_japanese  // readable if utf8
something_in_japanese // readable if euc-jp
something_in_japanese // readable if euc-jp
something_in_japanese // readable if shift-jis
something_in_japanese // readable if utf8

This is why i want an easy way to switch between the encodings. Preferably without having to get the data again.  (but that might be hoping for too much.)

The other option is to detect the language of the previous page when the link is input into the database and convert it to UTF8.  Ill explore that option if this one does not have a solution.

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LVL 75

Accepted Solution

Michel Plungjan earned 1260 total points
ID: 19997380
I absolutely support the last suggestion along with suggesting the participating sites to go UTF-8

Author Comment

ID: 19997413

Ok ill look into that option further.  But it is going to have problems too.  Yahoo Japan is euc-jp and i dont think they will change even if i ask nicely. ;)

help appreciated.
LVL 75

Expert Comment

by:Michel Plungjan
ID: 19997473
How about writing an iframe for each codepage?

Author Comment

ID: 20004309
Problem Sorted

detect the incoming string and convert it before entering it into the database.
$s = $_GET['tracking_id'];
//detect the encoding
$encoding = mb_detect_encoding($s, "JIS, EUC-JP,UTF-8, SJIS");
$s = mb_convert_encoding($s, 'UTF-8', $encoding);


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