javascriptencodingutf-8characterconverters

JavaScript function to convert UTF8 string between fullwidth and halfwidth forms

EDIT: Thanks to GOTO 0, I now know exactly what I my question is called.

I need a JavaScript function to convert from UTF-8 fullwidth form to halfwidth form for ASCII.

Solution

  • Try this

    function toASCII(chars) {
    var ascii = '';
    for(var i=0, l=chars.length; i<l; i++) {
        var c = chars[i].charCodeAt(0);

        // make sure we only convert half-full width char
        if (c >= 0xFF00 && c <= 0xFFEF) {
           c = 0xFF & (c + 0x20);
        }

        ascii += String.fromCharCode(c);
    }

    return ascii;
}

// example
toASCII("ＡＢＣ"); // returns 'ABC' 0x41