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JavaScript MCQs

Which of the following code snippets will correctly detect a touchscreen device?

function isTouchDevice() { return !!('ontouchstart' in window) || !!('onmsgesturechange' in window); };

function isTouchDevice() { try { document.body.createEvent("TouchEvent"); return true; } catch (e) { return false; } }

function isTouchDevice(){ return (typeof(navigator.ontouchstart) != 'undefined') ? true : false; }

function isTouchDevice(){ return (navigator.msMaxTouchPoints == 0); }

Answer

Correct Answer: function isTouchDevice() { return !!('ontouchstart' in window) || !!('onmsgesturechange' in window); };

Explanation:

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