Check if an variable is refer to designate object in JavaScript

Question

Suppose I have an variable assign to an "video" tag, how can I check if this variable is refer to the object of "HTMLVideoElement"

var video = document.getElementById('video')
if (video != object HTMLUnknownElement) {
//some code here
}

What is the code to replace with object HTMLUnknownElement above?

Thanks

sethobrien · Accepted Answer · 2011-09-05 11:22:29Z

1

typeof is pretty useless, it'll just tell you that it's an object. You'd do better with instanceof: video instanceof HTMLVideoElement.

EDIT: Some browsers don't know what an HTMLVideoElement is, so to protect against them throwing an exception here you should check for it: typeof HTMLVideoElement !== "undefined" && video instanceof HTMLVideoElement.

answered Sep 5, 2011 at 11:22

sethobrien

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