toggle has been removed since 1.9

toggle has been removed since 1.9 and was available before 1.8.x.

$(function(){

  $(".p_title").toggle(

    function(){

      $(this).netx().slideDown();

    },   // click once

    function(){

      $(this).netx().slideUp();

              })   // click again 

})

Change to the following way:

$(".p_title").click(function(){

       $( ' .c_item ' ).slideUp();    //Hide all subdirectories

  if ($( this ).next(). is (:visible)) {       // Whether is matches :visible display

       // Meet the condition 

       $( this ).next().slideUp(); // slide up 

   } else {

      $( this ).next().slideDown(); // slide up

         }

})

 

optimization:

$(".p_title").click(function(){

     $( ' .c_item ' ).slideUp();    // Hide all subdirectories

    if ($( this ).next(). is (:hidden)) {       // whether is matches: visible shows 
        $( this ).next().slideDown(); // slide up 
     }

})

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