jquery - How do I prevent a null trigger of an AJAX event? -


with following jquery code have created drop down updates page believe when changes #content returned result counting change event , pulling #sidebar info.

<script> var get_pages_load_options = {      target:        '#content',     data: {ajaxtype: 'content'},     beforesubmit:  function() {         console.debug('beforesubmit');     },     success: function() {         console.debug('successful');     } }; $("#content").on('change','.get_pages',function(){     var submit_page = $(this).attr('rel');     var form_url = $("#"+submit_page).attr('action');     console.debug(submit_page+" & "+form_url);     $("#"+submit_page).ajaxform(get_pages_load_options);     $.ajax({         type: "post",         url: form_url,         data: {ajaxtype: "side"},         success: function(data) {             console.debug(data);             $("#sidebar_menu").html(data);         }     }); }); </script>

the html follows #content:

<div id="content" class="content">     <h1>game updates</h1>     <form action="/gameplay/updates/" id="submit_page" name="submit_page" class="get_pages" method="post">         <select name="year" class="get_pages" rel="submit_page">             <option value="2012">2012 -- v1.7.0 - v2.0.0</option>             <option value="2011">2011 -- v1.5.3 - v1.6.0</option>             <option value="2010">2010 -- v1.3.3 - v1.5.2</option>             <option value="2009">2009 -- v1.1.4 - v1.3.2</option>             <option value="2008">2008 -- v0.6.0 - v1.1.3</option>             <option value="2007">2007 -- v0.1.x - v0.5.5</option>         </select>     </form>     /** update logs **/     <br/><br/>     <p>         -----------<br />         thank you,<br />         admin deth4uall     </p> </div>

do know how can prevent second firing of change. thanks!

edit: have regular version default above supposed overwriting below functionality:

$("#content").on('change','.get_pages',function(){     var submit_page = $(this).attr('rel');     $("#"+submit_page).submit(); });

if values undefined, return out of function.

$("#content").on('change','.get_pages',function(){     var submit_page = $(this).attr('rel');     var form_url = $("#"+submit_page).attr('action');     if (!submit_page || !form_url) {         return;     }     //console.debug(submit_page+" & "+form_url);     $("#"+submit_page).ajaxform(get_pages_load_options);     $.ajax({         type: "post",         url: form_url,         data: {ajaxtype: "side"},         success: function(data) {             //console.debug(data);             $("#sidebar_menu").html(data);         }     }); });

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