javascript - Targeting a span that is wrapped around a radio input -

my problem simple. i'm using template styling. way template handles form inputs wraps them in span tags. select radio button, have change class of span "checked". using checked="checked" or checked in input not work.

example:

<label class="radio"> <div class="radio" id="uniformed-undefined">     <span class="checked">         <input type="radio" name="grow" value="slash">     </span> </div> 

how can target <span class="checked"> based on input name "grow" , value "slash" ?

i've looked .before() i'm not sure that's correct answer.

jquery multiple attribute selector
, jquery parent

$("input[name='grow'][value='slash']").parent("span");