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UTF-8 Encoding

In working on a web-based application that needed to support Netscape Communicator 4.x+ and Microsoft Internet Explorer 5.x+, I discovered that the older versions of these browsers had poor support for UTF8 encoding. I needed to find a way to make form field entries URL-safe and also needed to support multiple languages. The JavaScript escape() function fixes ASCII characters that are not valid for use in URLs, but does not handle unicode characters well. To make matters worse, there were browser incompatibilities: using escape() in IE would generate a new string that looked like %unnnn, where n is a hexadecimal digit. The correct encoding should follow RFC 2279 and be a set of hexadecimal digit pairs like %nn%nn. Netscape 4 would just treat the characters as ASCII, which would result in lost accents and umlauts.

The encodeURIComponent() function introduced in IE5.5, Netscape 6, and Mozilla does exactly what is needed. However, since the function is unavailable in Netscape 4.x and IE5, a different solution is needed. All JavaScript strings are unicode, so I expected that it would be possible to properly encode them. Thankfully, someone saw my plea for help and sent me some helpful example code.

I have faced this problem. When using ajax jquery, even I have set the contentType is "application/json;charset=utf-8" it still not working for accented language (like Vietnamese). After searching, I have realized that we have to use this method encodeURIComponent() to encode unicode characters before submitting to server. So I took note it here with a hope that it is useful for ones who may face same problem as mine.

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Filed under: AJAX, ASP.NET, JQuery No Comments