Detect DOM object vs. jQuery Object

Question

I have a function that I want to be able to allow passing in either a regular javascript DOM element object or a jQuery object. If its not yet a jQuery object I will then make it one.

Does anyone know of a very reliable way to detect this.

function functionName(elm){    //Detect if elm is not a jquery object in condition    if (elm) elm = $(elm);  } 

A logical approach is to detect one of the properties of the DOM element object. The question is, which property would be the most reliable to detect?

I could also just make it a jquery object either way since jQuery doesn't have a problem with something like: $($imajQueryObjAlready); However, the purpose of this question is not to just solve the problem, but to find a good way to detect if its a DOM object vs. a jQuery object.

Answer 1

To test for a DOM element, you can check its nodeType property:

if( elm.nodeType ) {     // Was a DOM node } 

or you could check the jQuery property:

if( elm.jquery ) {     // Was a jQuery object }