Turkish case conversion in JavaScript

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Coming back to this years later to provide more up to date solution.

There is no need for the hack below,

just use
String.toLocaleUpperCase() and String.toLocaleLowerCase()

"dinç".toLocaleUpperCase('tr-TR') // "DİNÇ"

All modern browsers support this now.

[ OLD, DO NOT USE THIS ]

Try these functions

String.prototype.turkishToUpper = function(){
    var string = this;
    var letters = { "i": "İ", "ş": "Ş", "ğ": "Ğ", "ü": "Ü", "ö": "Ö", "ç": "Ç", "ı": "I" };
    string = string.replace(/(([iışğüçö]))+/g, function(letter){ return letters[letter]; })
    return string.toUpperCase();
}

String.prototype.turkishToLower = function(){
    var string = this;
    var letters = { "İ": "i", "I": "ı", "Ş": "ş", "Ğ": "ğ", "Ü": "ü", "Ö": "ö", "Ç": "ç" };
    string = string.replace(/(([İIŞĞÜÇÖ]))+/g, function(letter){ return letters[letter]; })
    return string.toLowerCase();
}

// Example
"DİNÇ".turkishToLower(); // => dinç
"DINÇ".turkishToLower(); // => dınç

I hope they will work for you.

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