有没有办法包装jQuery的isArrayLike？

Question

I'm trying to handle a conflict between XenForo and an essential plugin. Neither is code I can directly modify. jQuery 1.11.3 is the version in use, and that can't be upgraded either.

I can wrap the calling function with a try/catch and avoid the conflict, but the real fix would involve wrapping jQuery's isArrayLike with a try/catch.

isArrayLike is in the (current version) jQuery source at line 464 in https://github.com/jquery/jquery/blob/master/src/core.js#L464

What I need to catch seems to be exactly what was being debated in https://forum.jquery.com/topic/jquery-isarraylike-for-consistency with regard to isArrayLike throwing errors when passed invalid types.

So, since jQuery's isArrayLike isn't exposed, is there any way to either wrap it, or worst case, get in there and replace it?

Edit: Note, all the comments so far are trying to debug the error itself. That is not my question. I am asking if there is any way to access isArrayLike, so it can be wrapped with another function.

Answer 1

I would suggest replacing the jQuery each and map methods, which seem to be the only methods calling on isArrayLike , except for makeArray . But the fix I am suggesting is not necessary for the latter method.

Add this:

(function ($, origEach, origMap) {
    $.each = function (elems, callback, arg) {
        return origEach.call(this, Object(elems), callback, arg);
    };
    $.map = function (elems, callback, arg) {
        return origMap.call(this, Object(elems), callback, arg);
    };
})(jQuery, jQuery.each, jQuery.map);

It alters the first argument that is passed to map or each : it gets wrapped in an Object call, which changes nothing when it is an array, but turns the argument in an object if it is not an object (for some odd reason).

Patching jQuery

If you can use a patched version of jQuery, just store a copy of jQuery, and modify this line in the function isArrayLike :

var length = !!obj && "length" in obj && obj.length,

to:

var length = !!obj && "length" in Object(obj) && obj.length,

It should not be a problem for XenForo , as long as you explicitly add the patched jQuery via another script tag, after having included XenForo . The latest jQuery object overwrites the previous one, so XenForo will then also use the patched version, even though it included the non-patched jQuery library itself.

The downside of patching is that you cannot upgrade jQuery (implicitly with a XenForo upgrade) unless you patch it every time you upgrade (until the version where it is no longer necessary).

That is a problem you won't have with the first solution.