Dart google_maps issue

Question

i have a weird behavior of Google maps using dart !! here as you see the link responsible for making th map appears is "Géolocalisation" until now i have no problem! but when i reclick, or when i visit another link then returning back to "Géo.." it gaves me this and i really don't know what to do! this is my first try at GMap so i need a littel bit of help please. i must mention that the page doesn't refresh when i click at the link it's only delets the old content from the container div then add the new elements also i must mention that i'm using bootstrap3,this is the code for the page géo

import 'package:google_maps/google_maps.dart';
import '../view.dart';
import 'dart:html';
//view Map
class viewMap extends View{
  panelCoreBuilder(){
    //creating the container layout and it is a div row
    DivElement layout = new DivElement()..className="row";
    //adding a style element for the map element inside the container
    layout.children.add(new StyleElement()..text="#mapblock{margin: 0;padding: 0; height: 500px; width: 100%;"); 
    DivElement cellone = new DivElement()..className="col-md-3";
    //naming the block that contains the map
    DivElement celltow = new DivElement()..className="col-md-9"..id="mapblock";  
    //adding the cells to the layout 
    layout.children.addAll([cellone,celltow]);

    //creating the map
    visualRefresh = true;
    final mapOptions = new MapOptions()
    ..zoom = 8
    ..center = new LatLng(34.034453, -5.885925)
    ..mapTypeId = MapTypeId.ROADMAP;
    final map = new GMap(celltow, mapOptions);
    //returning the layout to the MainContainer...
    return layout;
  }
}

so that's it i hope you can give me any solution ,hypotheses ,or even a hint and if i fond the solution first i'll post it here!

Answer 1

This is likely that your <div> has an empty size (or not displayed) when the new GMap is called. The map is not aware of the <div> container resizing by default. You have to manually trigger a resize event when you display it on the screen with :

event.trigger(map, 'resize', []);