javascript - dependent dropdown error Undefined index: TRANCHE codeigniter -

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i have drop-down dependent on choices of other 2 drop-downs have debugged java script has error on error logs says,

undefined index: tranche

here controller

   public function dependent_dropdown()    {        if(isset($_post['tranche']) || isset($_post['grade']))        {              $data = $_post['tranche'];             $data1 = $_post['grade'];             $this->output             ->set_content_type("application/json")             ->set_output(json_encode($this->employeesalary_model->gettype($data, $data1)));        }    }

and here javascript

jquery(document).ready(function(){   $("#grade").change(function() {     var tranche = {"tranche" : $('#tranche').val()};     var grade = {"grade" : $('#grade').val()};     console.log(tranche);     console.log(grade);      $.ajax({       type: "post",       data: (tranche, grade),       url: "<?php base_url(); ?>employeesalary/dependent_dropdown/",        success: function(data){           var select = $('#sal_id');           select.html('');           $.each(data, function(i, option){               select.append("<option value='"+option.id+"'>"+option.amount+"</option>");           });       }      });    });  });

please tell me problem , how can debug it. thanks

you have make array send both values.

var postdata = [ tranche , grade ]

$.ajax({   type: "post",   data: json.stringify(postdata), ////stringify important    url: "<?php base_url(); ?>employeesalary/dependent_dropdown/",    success: function(data){       var select = $('#sal_id');       select.html('');       $.each(data, function(i, option){           select.append("<option value='"+option.id+"'>"+option.amount+"</option>");       });   }  });

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