javascript - xhttp.send() get error POST 500 (Internal Server Error) -


when trying send data server error post 500(internal server error ) display here form 

<form class="input-group" id="f">     <div class="form" style="display :-webkit-inline-box;">         <input type="text" class="form-control" name="comment" placeholder=" comment ">         <span class="input-group-btn">                  {{--<input class="btn btn-default" type="button" onclick="loaddoc()" value="comment!">!--}}              <input class="btn btn-default" type="button" onclick="loaddoc()" value="comment!">              </span>     </div>     <input type="hidden" name="_token" value="{{ csrf_token() }}"> </form><!-- /input-group -->

and javascript code

    function loaddoc() {         var dd = document.getelementbyid('f');         var d = [];         r=0;         (var = 0; < dd.elements.length; i++){             if(dd[i].type == "text") {             d[r] = dd[i].value;             r++;             }     }         var xhttp = new xmlhttprequest();         var url = "/place/{{$place->id}}";         var params = "data="+d;         xhttp.open("post", url , true);         xhttp.setrequestheader("content-type", "application/x-www-form-urlencoded");         xhttp.onreadystatechange = function() {             if (this.readystate == 4 && this.status == 200) {                 var json = json.parse(this.response);                 console.log(json);             }         };         xhttp.send(params);     }

i trying make comment .... in advanced


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