ORIGINAL EXCEPTION: TypeError: LocationModel_1.LocationModel is not a constructor

Ionic Framework ionic-v3
1

Hi All,

I am using Ionic 2.

I am getting this error, and I cannot figure out why. I am creating an object with a constructor, but the error states there is no constructor. Any help appreciated.

error

TypeError: LocationModel_1.LocationModel is not a constructor
var locationModel = new LocationModel_1.LocationModel();

code

var locationModel: LocationModel = new LocationModel();

LocationModel.ts

import { Injectable } from "@angular/core";

@Injectable()
export class LocationModel {
        public id: number = null;
        public latitude: number = null;
        public longitude: number = null;

        constructor() {
        }
}
2

This post says it is a bug with Typescript:

This is a bug in TS 1.8.10 and fixed in master.

What do I do to fix this? Do I upgrade my Typescript? How do I know what version I am using? How do I upgrade?

npm install -g typescript

installs typescript@1.8.10, so I guess this is the latest version? What do they mean it’s fixed on master, how do I install master? Here also shows that 1.8.10 is the latest version.

3

npm install typescript@next has not fixed this error.

4

I have the same problem. Did you find anything which fixes it?

5

I found something not very elegant. If I add var locationModel: LocationModel = new LocationModel(); outside the loop (not used), it seems to fix it, not sure why though. See it’s defined outside the loop, and then inside again where it was previously failing. So I guess it’s some scope issue.

  saveMarkers(): void {
    var locationModel: LocationModel = new LocationModel();
    var locationModels: LocationModel[] = [];
    for (var index = 0; index < this.markers.length; index++) {
      let marker: google.maps.Marker = this.markers[index];
      let location: google.maps.LatLng = marker.getPosition();
      var locationModel: LocationModel = new LocationModel();
      locationModel.latitude = location.lat();
      locationModel.longitude = location.lng();
      locationModels.push(locationModel);
    }
    this.employeeModel.locations = locationModels;
  }
6

Hi, thanks for the reply.

I also have it in a loop. But sadly for me, it doesn’t matter if I put it outside the loop or not.

I even have it as a parameter in a different view, getting the same error on it.

export class PictureDetailPage {    
    picture : Picture = new Picture();
}
7

If you’re interested, I managed to solve my problem here.

1 Like
8

Thank you. That was causing my problem too. I had a Capital letter in the import.

9

Good to hear that it solved your problems as well :slight_smile:

1 Like