Grab values from checked checkboxes and put them in an array using Javascript/jQuery -

i want values of checked checkboxes name="car_type[]" , alert final array values. how that? far, have code. it's not working. don't know how loop through checked checkboxes , add values array car_type_arr. cannot alert final array using alert(car_type_arr);. help.

$().ready(function(){          $('.prettycheckbox').click(function(e) {                  e.preventdefault();              var car_type_arr = [];                  $("input:checkbox[name=car_type]:checked").each(function()                         {                              // here need add values array in php                              // e.g. $car_type_arr[] = $the_grabbed_value;                              // using javascript syntax                              // how that?                         });                // need alert array, how in js?             alert(car_type_arr);              return false;         });  }); 

try below code:

<input type="checkbox" name="chkbox" value="xxx"> <input type="checkbox" name="chkbox" value="xxx1"> <input type="checkbox" name="chkbox" value="xxx2"> <input type="button" id="btnbox">  $(document).ready(function(){ $("#btnbox").click(function(){         var car_type_arr = [];          $("input:checkbox[name=chkbox]:checked").each(function() {                             car_type_arr.push($(this).val());             alert(car_type_arr);     });  }); }); 

demo: http://jsfiddle.net/xdpbp/