php - JQuery AJAX: Form submits twice -

in form i'm using ajax submit form. when click submit button executes method twice. can guide me find out problem

$("form#dealform").submit(function(event){      //disable default form submission     event.preventdefault();      var $form = $(event.target);      //grab form data     var formdata = new formdata($(this)[0]);      $.ajax({         url: $form.attr('action'),         type: 'post',         data: formdata,         async: false,         cache: false,         contenttype: false,         processdata: false,         success: function (returndata) {             alert(returndata.message);         }     });      return false; }); 

html:

<form name="dealform" id="dealform" action="<?php echo base_url(); ?>deals/update_deal/" method="post" enctype="multipart/form-data"> 

try this, if works, form hooked "submit" twice:

$("form#dealform").unbind('submit').submit( ... 

this unbind submit, bind action. fix if form bound submit. 1 of many possibilities, due calling script twice or perhaps validation plugin binding submit event separately.

note: can potentially unhook validation plugin, or other scripts bound submit.

if fix problem you, should investigate why happening. fix that, , remove unbind command. may fix problem, may cause more problems later. (aka: use debugging)