php - SUBMIT button not working with AJAX form -

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i have had 2 static select boxes 1 of populated mysql database. these sending via ajax php script add items on list. form included submit button , of working fine.

i replaced box b ajax run dependant select box (select box b populated based on result select box a). in running fine too. but...... now submit button won't work , don't know why?

can show me ? (there lots of stray id's , classes have been playing around, please excuse these)

thankyou!

ajax populate dropdown select box b based on result select a

<script> $(document).ready(function($) {    var list_select_id = 'a';    var list_target_id = 'b';    var initial_target_html = '<option value="">please select ...</option>'; //initial prompt target select  $('#'+list_target_id).html(initial_target_html); //give target select prompt option  $('#'+list_select_id).change(function(e) {  //grab chosen value on first select list change     var selectvalue = $(this).val();      //display 'loading' status in target select list     $('#'+list_target_id).html('<option value="">loading...</option>');  if (selectvalue == "") {     //display initial prompt in target select if blank value selected    $('#'+list_target_id).html(initial_target_html);     } else {   //make ajax request, using selected value   $.ajax({url: 'http://www.mypropertyviewing.com/client_order_form_v1.1/selector.php?svalue='+selectvalue,          success: function(output) {$('#'+list_target_id).html(output);}       });        } }); });  </script>

form select boxes b c

<form class="add-new-task" autocomplete="off" method="post" name="login_form">  <div> <select name="a" id="a">  <option value="">please select..</option>  <option value="chemical">chemical</option>  <option value="hardware">hardware</option>  </select>  <select name="b" id="b"></select> </div>  </br>  <div class="box300">     <p>select quantity</p> <select class="box250" name="c">   <option value="1">1</option>   <option value="2">2</option>   <option value="3">3</option>   <option value="4">4</option>   <option value="5">5</option>   <option value="6">6</option>   <option value="7">7</option>   <option value="8">8</option>   <option value="9">9</option>   <option value="10">10</option> </select> </div>  <input type='submit'  class ="submitbox" value='add order' > </form>

ajax send output select boxes b & c php script (which working)

<script>  // call add_task function  add_task();     delete_task(); // call delete_task function   function add_task() {     $('.add-new-task').submit(function(){     var new_taska = $('.add-new-task select[name=b]').val();     var new_taskb = $('.add-new-task select[name=c]').val();   if(new_taska != '') {$.post('add-task.php', { senda: new_taska, sendb:      new_taskb }, function( data ) {$(data).appendto('.task-list ul').hide().fadein(); delete_task();             });     }      return false;      }); }   function delete_task() {     $('.delete-button').click(function(){     var current_element = $(this);     var id = $(this).attr('id');      $.post('delete-task.php', { task_id: id }, function() {     current_element.parent().fadeout("fast", function() { $(this).remove();      });      });      });  }  </script>


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