When click on function showig this erro

Ionic Framework ionic-v3
1

i’m click on a function for navigation and nearbyPlace() function call into the ionViewWillEnter like this.showing an error.

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abcdef.PNG342×592 9.06 KB

actually i want to do after click on a button the goring to next page and load the function nearbyPlace and showing near by location into the map.

ionViewWillEnter(){
   this.nearbyPlace();  
}

please help me anyone.

2

try to call that function in constructor

3

i have try but showing save error.

4

below my code
Home.ts

find(event) {

  this.isType = event.target.value;
  alert(this.isType);
    

	this.navCtrl.push(MapPage,{
    isType:this.isType
  })
}

map.ts

export class MapPage {

  @ViewChild('map')
  mapElement: ElementRef;

  map:any;
  latLng:any;
  markers:any;
  mapOptions:any;
  
  isKM:any=500;
  isType:any="";
 
  constructor(public navCtrl: NavController,private ngZone: NgZone, private geolocation : Geolocation,public navParams: NavParams) { 

       
           this.isType= navParams.get('isType');
  }

  ionViewDidLoad() {
     this.loadMap();
  }
ionViewWillEnter(){
   this.nearbyPlace();  
}
  loadMap(){

    this.geolocation.getCurrentPosition().then((position) => {

      this.latLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
     //alert(this.latLng)
      this.mapOptions = {
        center: this.latLng,
        zoom: 14,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      }   
 
      this.map = new google.maps.Map(this.mapElement.nativeElement, this.mapOptions);
    }, (err) => {
      alert('err '+err);
    });

  }
 /*-----------------Find Nearby Place------------------------*/ 
nearbyPlace() {
  //alert(this.LatLng)
    alert(this.isKM);
    alert(this.isType);
    this.loadMap();
    this.markers = [];
    let service = new google.maps.places.PlacesService(this.map);
    service.nearbySearch({
              location: this.latLng,
              radius: this.isKM,
              types: [this.isType]
            }, (results, status) => {
                this.callback(results, status);
            });
  }

  callback(results, status) {
    if (status === google.maps.places.PlacesServiceStatus.OK) {
      for (var i = 0; i < results.length; i++) {
        this.createMarker(results[i]);
      }
    }
  }

  createMarker(place){
    var placeLoc = place;
    console.log('placeLoc',placeLoc)
    this.markers = new google.maps.Marker({
        map: this.map,
        position: place.geometry.location
    });

    let infowindow = new google.maps.InfoWindow();

    google.maps.event.addListener(this.markers, 'click', () => {
      this.ngZone.run(() => {
        infowindow.setContent(place.name);
        infowindow.open(this.map, this.markers);
      });
    });
  }