Question

How can get(dynamic) each class fieldset that wrapping the elements in it?

Like:

if click on button adult =get class=> .adult from here in the html: <fieldset class="adult">
if click on button child wbed =get class=> .child wbed from here in the html: <fieldset class="child wbed">
if click on button child bed =get class=> .child bed from here in the html: <fieldset class="child bed">
if click on button baby =get class=> .baby from here in the html: <fieldset class="baby">

Example: http://jsfiddle.net/WErW9/7/

$('button').live("click", function (event) {
    event.preventDefault();
    $(this).remove();
    var $this = $(this),
        $div = $this.parent('fieldset');
    var name = '.' + $(this).closest('fieldset').attr("class");
    alert(name);
});

Answer 1

How about using closest():

$('button').live("click", function(event){
    event.preventDefault();
    var $this = $(this), $div = $this.closest('fieldset');
    var name = '.' + $div.attr("class");
    alert(name);
});

^{[ View output ]}