Refresh map and layers in ARCGIS javascript -


i have drop down in page, when drop down value changes contents of map i.e data loaded should change.it loads first time when again changed not changing. new arcgis map , want reload map. tried several methods doesn't help. below code please suggest way fix this.

  require([         "esri/map",         "esri/timeextent", "esri/dijit/timeslider",         "esri/geometry/point",         "esri/symbols/picturemarkersymbol", "esri/graphic",         "esri/layers/graphicslayer",         "esri/geometry/polyline",         "dojo/_base/array", "dojo/dom", "dojo/domready!"     ], function (             map, timeextent, timeslider,             point, picturemarkersymbol, graphic,             graphicslayer, polyline,             arrayutils, dom             ) {           var globallocationarray = //my json data latitude , longitude          var map;         var longitude = 96.07677;         var latitude = 16.97986;         var point = new point(longitude, latitude);         var layer = new graphicslayer();         var layer1 = new graphicslayer();         map = new map("mapdiv", {             basemap: "osm",             center: point, // longitude, latitude             zoom: 7,             maxzoom: 15,             minzoom: 3,         });          map.on("load", function () {             map.infowindow.resize(250, 100);              //layer.clear();             //layer1.clear();              //map.removelayer(layer)             //map.removelayer(layer1)             //map.refresh();             //map.setextent(map.extent)         });          layer1.on("click", function (evt) {             console.log(evt);             map.infowindow.settitle("information");             var datadisplay ="contents";              map.infowindow.setcontent(datadisplay);             map.infowindow.show(evt.screenpoint, map.getinfowindowanchor(evt.screenpoint));         });          function createmarker(longitude, latitude, externalcause, date) {             var point = new point(longitude, latitude);             point = esri.geometry.geographictowebmercator(point);             var symbol;             if (externalcause == "success") {                 symbol = new picturemarkersymbol(                         "http://static.arcgis.com/images/symbols/shapes/bluepin1largeb.png", 32, 32)                         .setoffset(0, 15);             } else {                 symbol = new picturemarkersymbol(                         "http://static.arcgis.com/images/symbols/shapes/redpin1largeb.png", 32, 32)                         .setoffset(0, 15);             }             //var symbol= symbol = new picturemarkersymbol("http://static.arcgis.com/images/symbols/shapes/bluepin1largeb.png", 32, 32).setoffset(0, 15);             var graphic = new esri.graphic(point, symbol);              layer1.add(graphic);          }          function createpolyline(sourcepoint, destpoint) {               var point1 = new point(sourcepoint[0], sourcepoint[1]);             var point2 = new point(destpoint[0], destpoint[1]);             var line = new esri.geometry.polyline();             var linesymbol = new esri.symbol.simplelinesymbol(esri.symbol.simplelinesymbol.style_solid, new dojo.color([0, 0, 255, 0.5]), 3);             line.addpath([point1, point2]);             var graphic = new graphic(line, linesymbol);             layer.add(graphic);           }          function drawgeomap(data) {             console.info(data);              (var row in data) {                 var rowobj = createobject(data[row]);                  createmarker(rowobj.long, rowobj.lat, rowobj.externalcause, rowobj.date,rowobj.cellname,rowobj.bts);                 createmarker(rowobj.sblong, rowobj.sblat, rowobj.sbexternalcause, rowobj.sbdate,rowobj.sbcellname,rowobj.sbbts);                 createpolyline([rowobj.long, rowobj.lat], [rowobj.sblong, rowobj.sblat]);                }             map.addlayer(layer);             map.addlayer(layer1);         }          function createobject(rowdata) {             var count = 0;             var obj = {                 sblat: rowdata[count++],                 sblong: rowdata[count++],                 sbexternalcause: rowdata[count++],                 sbdate: rowdata[count++],                  sbcellname: rowdata[count++],                   sbbts: rowdata[count++],                 lat: rowdata[count++],                 long: rowdata[count++],                 externalcause: rowdata[count++],                 date: rowdata[count++],                  cellname: rowdata[count++],                   bts: rowdata[count++]             };             return obj;         }          initslider();          function initslider() {             var timeslider = new timeslider({                 style: "width: 100%;"             }, dom.byid("timesliderdiv"));              var timeextent = new timeextent();             timeextent.starttime = new date("2/14/2015");             timeextent.endtime = new date("2/15/2015");             timeslider.setthumbcount(2);             timeslider.createtimestopsbytimeinterval(timeextent, 30, "esritimeunitsminutes");             timeslider.setthumbindexes([0, 1]);             timeslider.setthumbmovingrate(2000);             timeslider.startup();              //add labels every other time stop             var labels = arrayutils.map(timeslider.timestops, function (timestop, i) {                 console.log(timestop)                 if (i % 2 === 0) {                     var minutes;                     if (timestop.getminutes() < 10) {                         minutes = "0" + timestop.getminutes();                     } else {                         minutes = timestop.getminutes();                     }                      return timestop.gethours() + ":" + minutes;                 } else {                     return "";                 }             });              timeslider.setlabels(labels);             timeslider.on("time-extent-change", function (evt) {                 layer.clear();                 layer1.clear();                 map.infowindow.hide();                  var startminutes;                 var endminutes;                 if (new date(evt.starttime).getminutes() < 10) {                     startminutes = "0" + new date(evt.starttime).getminutes();                 } else {                     startminutes = new date(evt.starttime).getminutes();                 }                  if (new date(evt.endtime).getminutes() < 10) {                     endminutes = "0" + new date(evt.endtime).getminutes();                 } else {                     endminutes = new date(evt.endtime).getminutes();                 }                  var startvalstring = new date(evt.starttime).gethours() + ":" + startminutes;                 var endvalstring = new date(evt.endtime).gethours() + ":" + endminutes;                 var start=globalarraywithlocationandimsi.length;                 var end = 0                 for(var i=0;i<globalarraywithlocationandimsi.length;i++)                 {                     var srt = parseint(globalarraywithlocationandimsi[i].start.split(' ')[1].split(':')[0])                     if(srt>= new date(evt.starttime).gethours() && srt<=new date(evt.endtime).gethours())                     {                         console.log(srt);                         console.log(globalarraywithlocationandimsi[i].start);                         if(start>i)                         {                             start=i;                         }                         if(end<i)                         {                             end=i;                         }                     }                 }                console.log(start);                console.log(end);                 (var j = start; j < end; j++) {                     drawgeomap([[globalarraywithlocationandimsi[j].latitude, globalarraywithlocationandimsi[j].longitude, globalarraywithlocationandimsi[j].externalcause, globalarraywithlocationandimsi[j].timestamp1,globalarraywithlocationandimsi[j].cellname, globalarraywithlocationandimsi[j].bts,globalarraywithlocationandimsi[j + 1].latitude, globalarraywithlocationandimsi[j + 1].longitude, globalarraywithlocationandimsi[j + 1].externalcause, globalarraywithlocationandimsi[j + 1].timestamp1,globalarraywithlocationandimsi[j+1].cellname, globalarraywithlocationandimsi[j+1].bts]]);                 }                 dom.byid("daterange").innerhtml = "<i>" + startvalstring + " , " + endvalstring + "<\/i>";             });         }                                                });

also time extent needs refreshed. note: when dropdown changes call entire function above. please suggest way refresh contents loaded arcgis map. thank in advance


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