Myujth

I have integrated Bing map for showing map marker from a postcode. The post will pass as input for the map. If I go to map first-time with postcode it will work fine. After returning from map page if I keep application ideal for 3o minute then if I will redirect to Bing map page with postcode then it will not plot a marker on the map.

bingmap.ts 

 getMarker() 
 Microsoft.Maps.loadModule(['Microsoft.Maps.SpatialDataService',
 'Microsoft.Maps.Search'], () => 
 this.searchManager = new Microsoft.Maps.Search.SearchManager(this.map);
 );
 var url = environment.baseurl + '/tables/Property?$filter=IncidentId eq ';
 const data = this.passdataservice.bingMapdata.mapparam;
 const searchrequest = data.postcode;
 let geocodeRequest = 
 where: searchrequest,
 callback: this.generateMarker,
 errorCallback: (e) => 
 ,
 userData: that: this 
 ;
 this.searchManager.geocode(geocodeRequest);
 
 // end of fucntion

 // frucntion for generating marker
 generateMarker(geocodeResult, userData) 
 userData.that.clearOldMapsData();
 let that = userData.that;
 console.log('result data fucntion');
 console.log(geocodeResult);
 console.log('userData');
 console.log(userData.that);
 if (geocodeResult && geocodeResult.results && geocodeResult.results.length > 0) 
 let latLongDetails: LatLongDetail = ;
 for (const result of geocodeResult.results) 
 let latLongRecord = new LatLongDetail();
 latLongRecord.lat = result.locations[0].latitude;
 latLongRecord.long = result.locations[0].longitude;
 latLongDetails.push(latLongRecord);
 
 for (var i = 0; i < 1; i++) 
 let loc = new Microsoft.Maps.Location(latLongDetails[i].lat, latLongDetails[i].long);
 let title = 
 title: latLongDetails[i].buildingName,
 icon: '../../assets/images/map_marker.png'
 
 // custom map setview
 that.map.setView(
 mapTypeId: Microsoft.Maps.MapTypeId.road,
 center: new Microsoft.Maps.Location(latLongDetails[i].lat, latLongDetails[i].long),
 zoom: 7
 );
 const data = that.passdataservice.bingMapdata.mapparam;
 // const searchrequest = data.buildingName + ", " + data.dependentLocality + "," + data.postcode;
 const searchrequest = data.postcode;
 let pin = new Microsoft.Maps.Pushpin(loc, title);
 var infobox = new Microsoft.Maps.Infobox(loc, 
 title: data.postcode,
 description: searchrequest,
 visible: false
 );
 infobox.setMap(that.map);
 Microsoft.Maps.Events.addHandler(pin, 'click', () => 
 infobox.setOptions( visible: true );
 );
 that.map.entities.push(pin);
 that.mapvisible = true;
 
 
 // end of fucntion