javascript - Why does my java script function stop half way without reason -

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please note page school project, not meant function payment page. code executes on submit, gets far checking name, if there problem date or cvc code skips , continues if received true value. great deadline approaching. need run entirety of code. example of code it can found @ http://www.come-get-me-games.x11s.org/confirm_booking.php

the code area is

    <script type="text/javascript">     function check(){         var num = document.getelementbyid('cardnumber');                 var name = document.getelementbyid('nameoncard');         var dater = document.getelementbyid('expdate');         var cvc = document.getelementbyid('cvc');          if(num.value==="" || num.value===null){             alert('please enter card number');             return false;         }else if (name.value==="" || name.value===null){             alert('please enter appears on card');             return false;         }else if (dater.value==="dd/mm/yyy" || dater.value === "" || dater.value===null){             alert('please enter date');             return false;         }else if (cvc.value==="" || cvc.value===null){             alert('enter cvc number, can found \n last 3 digits on number on of code');             return false;         } else {             var check = confirm('are sure wish purchase these tickets');             if(check === true){                 return true;             }else{                 return false;             }         }     }  </script>  </table> </div>     <div style="text-align:left;position:absolute;bottom:0px;left:10px;width:480px">          <?php echo "total ticket price &pound".$price ?><br>         <br>         <h3>payment</h3>         <form method="post" action="scripts/ticket_buy.php" onsubmit="return check()">         <div class="item_container">             card number <input value="" type="text" id="cardnumber" name="cardnumber" style="position:absolute;right:0px" /><br />             name on card<input value="" type="text" id="nameoncard" style="position:absolute;right:0px" name="nameoncard" /><br />             expiry date<input value="" type="date" id="epxdate" style="position:absolute;right:0px" name="expdate" /><br />             cvc number<input value="" type="text" id="cvc" style="position:absolute;right:0px" name="cvc">             <br />             <input type="hidden" value='<?php echo $eventidwanted ?>' name="eid">             <input type="hidden" value="<?php echo $performanceidwanted ?>" name="pid">             <input type="submit" value="purchase" class="button_default" style="width:480px">         </div>         </form>    </div>

correct id date. in js have expdate while in input have epxdate

 expiry date<input value="" type="date" id="expdate" style="position:absolute;right:0px" name="expdate" /><br />

working jsfiddle

just note : whenever js seems not working use firebug console or chrome console see if there js error or not.


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