Django- ajax passing multiple values to the url

I am trying to get more details on clicking a button "type="button" class="apireq"" defined on each row and capture the result in javascript and show it in a window 

I am not able to get the clicked row data in jquery .It says variable value undefined .I wanted to POST multiple values . Is this the way to do it ? Do I need to modify urls.py 

template

----------

<tbody id="collist"></tbody>

  </tr>   

    {% for index, row in s_results.iterrows %} 

<tr>

  <td> {{ row.colname }} </td> <td> {{ row.dbname }} </td> <td> {{ row.schemaname }} </td> <td> {{ row.tablenm }} </td>

          <td> {{ row.coltype }} </td> <td> {{ row.collength }} </td> <td> {{ row.colscale }} </td>      

          <td>  <input type="button" class="apireq" 

data-colname="{{row.colname}}"

data-dbname="{{row.dbname}}"

data-schemaname="{{row.schemaname}}"

data-tablenm="{{row.tablenm}}" /> </td>

  <tr>

    {% endfor %}

</tbody>

  

js/app.js

----------

$('.apireq').click( function() {

    var jq_column_name=  $("#collist tr").last().attr("data-colname");

    var jq_dbname=  $("#collist tr").last().attr("data-dbname");

    var jq_schemaname=  $("#collist tr").last().attr("data-schemaname");

    var jq_tablenm=  $("#collist tr").last().attr("data-tablenm");

    $.ajax({            

             type: "POST",

              url : "http://localhost:8000/refresh1/",

              contentType: 'application/json; charset=utf-8',

              data: { column_name:jq_column_name,db_name:jq_dbname,schema_name:jq_schemaname,table_name:jq_tablenm },

             success : function (data) {

                      alert("success!!"); 

                    },

              error : alert("Failed!!")

                 });                 

});

urls.py

-------

path('refresh/<str:column_name>/<str:db_name>/<str:schema_name>/<str:table_name>', views.refresh1, name='refresh1'),

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