How to determine if window.confirm() is supported?

Question

I have a mobile website that is used by various devices including some onboard computers running a locked down version of Windows Embedded 7 with IE 7. For some reason that I ca

Answer 1

You could do

if ('confirm' in window && typeof window.confirm === 'function' ) {
    $(".logoff").click(function () {
        return window.confirm("Are you sure you want to log off?");
    });
}

Answer 2

if(typeof confirm=='function')// window.confirm is defined and a function

Answer 3

While the following suggested methods worked in every desktop browser I tested, they all evaluated to true on the device and still didn't display a dialog or navigate to the link in the anchor's href.

if (typeof confirm == 'object')
if ('confirm' in window && typeof window.confirm === 'object')
if (window.confirm)

(In IE 7, typeof somefunction is 'object' instead of 'function')

My solution was to use a jQuery UI Dialog instead, based on @ThiefMaster's suggestion.

Answer 4

How about:

if ('confirm' in window) {
    $(".logoff").click(function () {
        return window.confirm("Are you sure you want to log off?");
    });
}

Another options would be window.hasOwnProperty('confirm').

Answer 5

You could use typeof to check if the window.confirm is a function