Jquery toggle class on click -

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i have following div,

   <div id="mainoutput">         <img src="/img/preloader.gif" alt="loading" class="preloader" />     </div>

the beginning of ajax/jquery ,

        $(document).ready(function() {             $(".preloader").hide();             $("#button").click(function() {                  $(".preloader").slidetoggle( "slow" );                  var host = $("#hostinput").val();                  var record = $("#recordinput").val();                  $.ajax({                       url : "/cachecheck_ajax",                       type : "post",                       datatype: "json",                       data : {                           hostinput : host,                           recordinput : record,                           csrfmiddlewaretoken: '{{ csrf_token }}'                           },                       success: function(json){                        stuff...                        $(".preloader").slidetoggle( "slow" );                       $('#mainoutput').html(table).hide().slidetoggle( "slow" );

all works fine. click submit, preloader shows, until ajax success kicks in, preloader toogled , main div (#mainoutput) shown.

however if want submit again want #mainoutput toggled (hidden) , preloader show again. best method ?

i did try following complete broke ajax , json returned,

    $(document).ready(function() {         $(".preloader").hide();         $("#button").click(function() {              // addition              if($('#mainoutput').is(':visible'));{                  $("#mainoutput").slidetoggle( "slow" ).html();              }              //              $(".preloader").slidetoggle( "slow" );              var host = $("#hostinput").val();              var record = $("#recordinput").val();              $.ajax({

i use jquery.ajax's beforesend , complete callback methods. hope below code you!

$(document).ready(function() {     var xhr = null;     $(".preloader").hide();      $("#button").click(function() {         var host = $("#hostinput").val();         var record = $("#recordinput").val();          if (xhr != null) {             xhr.abort();    //abort existing xhr call             $(".preloader").hide(); //by default hide element         }          //get referance in xhr variable         xhr = $.ajax({             url : "/cachecheck_ajax",             type : "post",             datatype: "json",             data : {                 hostinput : host,                 recordinput : record,                 csrfmiddlewaretoken: '{{ csrf_token }}'             },             beforesend: function (jqxhr, settings) {                 $(".preloader").slidetoggle( "slow" );  //before sending server, show element             },             success: function(json, textstatus, jqxhr) {                  //todo: stuff...!!!                  $('#mainoutput').html(table).hide().slidetoggle( "slow" );             },             error: function (jqxhr, textstatus, errorthrown) {                 //todo: handle errors here...!!!             },             complete: function (jqxhr, textstatus) {                 //jquery delegate call after xhr. hide element                  $(".preloader").slidetoggle( "slow" );             }         });     }); });

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