How can I programmatically detect if an object is a jQuery object? For example:
// 1. declare some variables
var vars = [1, 'hello', ['bye', 3], $(body), { say: 'hi' }];
// 2. ??? : implement function that tests whether its parameter is a jQuery object
function isjQuery(arg) { /* ??? */ }
// 3. profit
var test = $.map(vars, isjQuery); /* expected [ false, false, false, true, false ] */
The easiest API-documented way is to test for the .jquery property:
function isjQuery(arg) {
return !!arg.jquery;
}
However, if you want to be sure it's a jQuery object and not some other object with a fake .jquery property, the other answers suggesting instanceof jQuery and testing the constructor work too.
(The .jquery property is formally a string indicating the jQuery version, but the API example uses it to test whether an object is a jQuery object.)
I think you can rely on
if ( vars[i] instanceof jQuery ) {
// do something with this jQuery object
}
but I also found these methods here:
obj && obj.constructor == jQuery
obj && obj.jquery
There are several ways, but the clearest (in my opinion) would be:
function isjQuery(arg) { return arg instanceof jQuery; }
