How do I limit the results of a php query based on the value of a javascript variable? -

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originally had where class_id = 3 in php query learned more server-side things realized wouldn't able change once page loaded without ajax or something. i've taken away where part of query , getting results class_id's.

my hope can use radio limit rows returned matching radio button checked.

ex. click class 2 radio button, click go, , rows class_id = 2 show up. 

<input type='button' name='go' value='go' onclick='getselected()'>  function getselected() {   var queryclass = "";   if (classthree.checked) {     queryclass = 3;   } else if (classtwo.checked) {     queryclass = 2;   } else if (classone.checked) {     queryclass = 1;   } }

i can desired value don't know value limit rows. if possible it'd great know how.


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