can i narrow the input down but a class

I have this

    $("input:radio").change(function() {

can i do something like

    $(".someclass input:radio").change(function() {

Is that eve开发者_运维百科n correct and if not is there a better way

That'll match a radio input contained in an element with the class "someclass". Yes, it's valid, but without seeing your HTML I don't know if it's "correct".

You can give your radio button an ID and reference it with #id if you think that's "better".

the class goes in place of the element type for most uses, it sounds like you want:

$(".someclass:radio")

note: $(":radio") works fine by it self

It sounds like what you're trying to do is select all radio buttons that have a certain class, which can be accomplished like this:

$("input:radio.someclass").change(function() {

I don't use jQuery (I prefer plain old JavaScript), but you could use getElementsByClassName('someclass') then check them to make sure they're an input of type radio.