detectMobile.js

function detectMobile() {
    if (/Android|webOS|iPhone|iPad|iPod|BlackBerry|BB|PlayBook|IEMobile|Windows Phone|Kindle|Silk|Opera Mini/i.test(navigator.userAgent)) {
        return true;
    } else {
        return false;
    }
}

function detectPortrait() {       
    if (Math.abs(window.orientation) === 90) {
        return false;
    } else {
        return true;
    }
}

function detectMobilePortrait() {
    if (detectMobile() && detectPortrait()) {
        return true;
    } else {
        return false;
    }
}