enketo-core/src/js/sniffer.js

Extensible Enketo form engine

/**
 * @module sniffer
 * */

const ua = navigator.userAgent;
const pf = navigator.platform;

// We usually don't need to know which OS is running, but want to know
// whether a specific OS is runnning.

/**
 * @namespace os
 * */
const os = {
    /**
     * @type {string}
     * */
    get ios() {
        // in iOS13, the default Safari setting is 'Request Desktop Site' to be On.
        // The platform and useragent no longer show iPad/iPhone/iPod
        // so we use a trick that will work for a while until MacOs gets touchscreen support.
        return (
            /iPad|iPhone|iPod/i.test(pf) ||
            (/Mac/i.test(pf) &&
                document.documentElement.ontouchstart !== undefined)
        );
    },
    /**
     * @type {string}
     * */
    get android() {
        return /android/i.test(ua);
    },
    /**
     * @type {string}
     * */
    get macos() {
        return /Mac/.test(ua);
    },
};

/**
 * @namespace browser
 * */
const browser = {
    /** ua
     * @type {string}
     * */
    get safari() {
        return /^((?!chrome|android).)*safari/i.test(ua);
    },
};

export { os, browser };