Search a string of having an upper/lower alpha character.

hasAlpha.js

function hasAlpha(val,upper) {
    if (upper) {
        for (var i in val) {
            if ((val.charCodeAt(i)>=65) && (val.charCodeAt(i)<=90)) return true;
        }
    }
    else {
        for (var i in val) {
            if ((val.charCodeAt(i)>=97) && (val.charCodeAt(i)<=122)) return true;
        }
    }
    return false;
}