How to POST value to PHP in the same page using jQuery

Question

Hai,

I have one label and button. when i click button, i need display button value into label    

in same page without page reload in php

 

I will Try this

 

$(function (){

$(".1234").click(function() {

$(".123").toggle();

var CID = $(this).val();

$.ajax({

type: "POST",

url: "php/test.php",

 

data:{C_ID:CID},

 success: function(data){

 alert(data);

});

});

});

 

in test.php;

$id = $_REQUEST["C_ID"];

 

but i can't get the button value 

 

plz help