jQuery AJAX call on NodeJS and mysql (POST req) for dependent dropdown -


i new node js give solution examples tried dependent dropdown list mysql database please me solution. in advance. searched lot in internet dependent dropdown list nothing there nodejs php only

html

<label class="field" >site</label>                <select name="site" id="dropdown" >                 <option value="">- select -</option>               </select>           <label class="field" >block</label>               <select name="block" id="dropdown1" >                 <option value="">- select -</option>               </select>

script

<script>     $(document).ready(function(){     $.ajax({         url : "/site_name",         type : "get",         success : function(data){              var len = data.length;              console.log(data);             $("#dropdown").empty();             for(var =0; i<len;i++){             var value1 = data[i]['site_name'];             var value2 = data[i]['site_id'];                 $("#dropdown").append("<option value='"+value2+"' >"+value1+"</option>");              }          }     }); });       $("#dropdown").change(function(){     $.ajax({         url : "/block_name",         type : "get",         success : function(data){              var len = data.length;              console.log(data);             $("#dropdown1").empty();             for(var =0; i<len;i++){             var value1 = data[i]['block_name'];             var value2 = data[i]['block_id'];                 $("#dropdown1").append("<option value='"+value2+"' >"+value1+"</option>");              }          }     }); });     </script>

in server.js

app.get('/block_name', function (req,res){      //var id=  req.body.site;     var sql='select  `block_name`,`block_id` `tbl_block` ';     connection.query(sql,function(err, result) {         if (err) throw err;         res.json(result);     }); });


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