Get UTF-8 string length in bytes

countUtf8Bytes.js

/**
 * Get UTF-8 string length in bytes
 * @see http://stackoverflow.com/questions/2848462/count-bytes-in-textarea-using-javascript
 *
 * @param {String} string
 * @returns {Number}
 */
function countUtf8Bytes(string) {
    var utf8length = 0;
    for (var i = 0; i < string.length; i++) {
        var c = string.charCodeAt(i);
        if (c < 128) {
            utf8length++;
        } else if ((c > 127) && (c < 2048)) {
            utf8length += 2;
        } else {
            utf8length += 3;
        }
    }
    return utf8length;
}