What jQuery annoyances should I be aware of as a Prototype user?

Question

We're considering switching our site from Prototype to jQuery. Being all-too-familiar with Prototype, I'm well aware of the things about Prototype that I find limiting or annoying.

My question for jQuery users is: After working with jQuery for a while, what do you find frustrating? Are there things about jQuery that make you think about switching (back) to Prototype?

Answer 1

I think the only that gets me is that when I do a selection query for a single element I have to remember that it returns an array of elements even though I know there is only one. Normally, this doesn't make any difference unless you want to interact with the element directly instead of through jQuery methods.

Answer 2

Probably the only real issue I've ever ran into is $(this) scope problems. For example, if you're doing a nested for loop over elements and sub elements using the built in JQuery .each() function, what does $(this) refer to? In that case it refers to the inner-most scope, as it should be, but its not always expected.

The simple solution is to just cache $(this) to a variable before drilling further into a chain:

$("li").each(function() {
    // cache this
    var list_item = $(this);
    // get all child a tags
    list_item.find("a").each(function() {
        // scope of this now relates to a tags
        $(this).hide("slow");
    });
});