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 i

Answer 1

The classy way:

function is_jquery_object(x) {
    return window.jQuery && x instanceof jQuery;
}

function is_dom_object(x) {
    return window.HTMLElement && x instanceof HTMLElement;
}

Building on @karim79's answer, if you need to be sure it's either a DOM or jQuery object, use these tests. (The window test helps the function fail gracefully if the class is not defined, e.g. jQuery failed to load.)