How to check if object is a DOM element? [duplicate]

Question

I have a function:

function Check(o) {     alert(/* o is a DOM element ? "true" : "false" */); } 

How can I check if the parameter o is a DOM object or not?

Answer 1

A DOM element implements the Element interface. So you can use:

function Check(o) {     alert(o instanceof Element); } 

Answer 2

Check if the nodeName property exists.

Basically check if it is a Node: look at the DOM lvl 1 specs, check the Node definition.

If you meant it literally when you said Element check for tagName property, look at the Element definition in the same spec

So to recap, do either

function Check(o) {     alert(o.tagName ? "true" : "false"); } 

to check if it is a DOM Element or

function Check(o) {     alert(o.nodeName ? "true" : "false" ); } 

to check if it is a DOM Node