Question

i wanna to alert only the last value not all the clicked class
example

$(document).ready(function(){
$(".a").click(function(){
 var a = $(this).children(".b").val();
    $("#b").click(function(){
       alert(a);            
    });
});

});​

here is the code

Answer 1

You’re stacking the click events.

Use .unbind() to remove previous click events added to $("#b")

Change to:

$(document).ready(function(){
$(".a").click(function(){
 var a = $(this).children(".b").val();
    $("#b").unbind("click");
    $("#b").click(function(){
       alert(a);            
    });
});
});​

— See Working Demo —