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Step 11: Google Maps & Geolocation

In this step we will add the ability to send the current location in Google Maps.

Step 11.1: Add cordova plugin for geolocation

Changed .meteor/cordova-plugins
@@ -1,5 +1,6 @@
 ┊1┊1┊cordova-plugin-console@1.0.5
 ┊2┊2┊cordova-plugin-device@1.1.4
+┊ ┊3┊cordova-plugin-geolocation@2.4.1
 ┊3┊4┊cordova-plugin-splashscreen@4.0.1
 ┊4┊5┊cordova-plugin-statusbar@2.2.1
 ┊5┊6┊cordova-plugin-whitelist@1.3.1

Geo Location

To get the devices location (aka geo-location) we will install a Cordova plug-in called cordova-plugin-geolocation which will provide us with these abilities:

$ meteor add cordova:cordova-plugin-geolocation@2.4.1

Angular 2 Google Maps

Since the location is going to be presented with Google Maps, we will install a package which will help up interact with it in Angular 2:

$ meteor npm install --save angular2-google-maps

Before you import the installed package to the app's NgModule be sure to generate an API key. An API key is a code passed in by computer programs calling an API to identify the calling program, its developer, or its user to the Web site. To generate an API key go to Google Maps API documentation page and follow the instructions. Each app should have it's own API key, as for now we can just use an API key we generated for the sake of this tutorial, but once you are ready for production, replace the API key in the script below:

Step 11.3: Import google maps module

Changed client/imports/app/app.module.ts
@@ -1,4 +1,5 @@
 ┊1┊1┊import { NgModule, ErrorHandler } from '@angular/core';
+┊ ┊2┊import { AgmCoreModule } from 'angular2-google-maps/core';
 ┊2┊3┊import { MomentModule } from 'angular2-moment';
 ┊3┊4┊import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
 ┊4┊5┊import { ChatsPage } from '../pages/chats/chats'
@@ -26,7 +27,10 @@
 ┊26┊27┊  ],
 ┊27┊28┊  imports: [
 ┊28┊29┊    IonicModule.forRoot(MyApp),
-┊29┊  ┊    MomentModule
+┊  ┊30┊    MomentModule,
+┊  ┊31┊    AgmCoreModule.forRoot({
+┊  ┊32┊      apiKey: 'AIzaSyAWoBdZHCNh5R-hB5S5ZZ2oeoYyfdDgniA'
+┊  ┊33┊    })
 ┊30┊34┊  ],
 ┊31┊35┊  bootstrap: [IonicApp],
 ┊32┊36┊  entryComponents: [

Attachments Menu

Before we proceed any further, we will add a new message type to our schema, so we can differentiate between a text message and a location message:

Step 11.4: Added location message type

Changed imports/models.ts
@@ -8,7 +8,8 @@
 ┊ 8┊ 8┊}
 ┊ 9┊ 9┊
 ┊10┊10┊export enum MessageType {
-┊11┊  ┊  TEXT = <any>'text'
+┊  ┊11┊  TEXT = <any>'text',
+┊  ┊12┊  LOCATION = <any>'location'
 ┊12┊13┊}
 ┊13┊14┊
 ┊14┊15┊export interface Chat {

We want the user to be able to send a location message through an attachments menu in the MessagesPage, so let's implement the initial MessagesAttachmentsComponent, and as we go through, we will start filling it up:

Step 11.5: Added stub for messages attachment menu

Added client/imports/pages/messages/messages-attachments.ts
@@ -0,0 +1,15 @@
+┊  ┊ 1┊import { Component } from '@angular/core';
+┊  ┊ 2┊import { AlertController, Platform, ModalController, ViewController } from 'ionic-angular';
+┊  ┊ 3┊import template from './messages-attachments.html';
+┊  ┊ 4┊
+┊  ┊ 5┊@Component({
+┊  ┊ 6┊  template
+┊  ┊ 7┊})
+┊  ┊ 8┊export class MessagesAttachmentsComponent {
+┊  ┊ 9┊  constructor(
+┊  ┊10┊    private alertCtrl: AlertController,
+┊  ┊11┊    private platform: Platform,
+┊  ┊12┊    private viewCtrl: ViewController,
+┊  ┊13┊    private modelCtrl: ModalController
+┊  ┊14┊  ) {}
+┊  ┊15┊}

Step 11.6: Added messages attachment menu template

Added client/imports/pages/messages/messages-attachments.html
@@ -0,0 +1,18 @@
+┊  ┊ 1┊<ion-content class="messages-attachments-page-content">
+┊  ┊ 2┊  <ion-list class="attachments">
+┊  ┊ 3┊    <button ion-item class="attachment attachment-gallery">
+┊  ┊ 4┊      <ion-icon name="images" class="attachment-icon"></ion-icon>
+┊  ┊ 5┊      <div class="attachment-name">Gallery</div>
+┊  ┊ 6┊    </button>
+┊  ┊ 7┊
+┊  ┊ 8┊    <button ion-item class="attachment attachment-camera">
+┊  ┊ 9┊      <ion-icon name="camera" class="attachment-icon"></ion-icon>
+┊  ┊10┊      <div class="attachment-name">Camera</div>
+┊  ┊11┊    </button>
+┊  ┊12┊
+┊  ┊13┊    <button ion-item class="attachment attachment-location">
+┊  ┊14┊      <ion-icon name="locate" class="attachment-icon"></ion-icon>
+┊  ┊15┊      <div class="attachment-name">Location</div>
+┊  ┊16┊    </button>
+┊  ┊17┊  </ion-list>
+┊  ┊18┊</ion-content>

Step 11.7: Added styles for messages attachment

Added client/imports/pages/messages/messages-attachments.scss
@@ -0,0 +1,46 @@
+┊  ┊ 1┊.messages-attachments-page-content {
+┊  ┊ 2┊  $icon-background-size: 60px;
+┊  ┊ 3┊  $icon-font-size: 20pt;
+┊  ┊ 4┊
+┊  ┊ 5┊  .attachments {
+┊  ┊ 6┊    width: 100%;
+┊  ┊ 7┊    margin: 0;
+┊  ┊ 8┊    display: inline-flex;
+┊  ┊ 9┊  }
+┊  ┊10┊
+┊  ┊11┊  .attachment {
+┊  ┊12┊    text-align: center;
+┊  ┊13┊    margin: 0;
+┊  ┊14┊    padding: 0;
+┊  ┊15┊
+┊  ┊16┊    .item-inner {
+┊  ┊17┊      padding: 0
+┊  ┊18┊    }
+┊  ┊19┊
+┊  ┊20┊    .attachment-icon {
+┊  ┊21┊      width: $icon-background-size;
+┊  ┊22┊      height: $icon-background-size;
+┊  ┊23┊      line-height: $icon-background-size;
+┊  ┊24┊      font-size: $icon-font-size;
+┊  ┊25┊      border-radius: 50%;
+┊  ┊26┊      color: white;
+┊  ┊27┊      margin-bottom: 10px
+┊  ┊28┊    }
+┊  ┊29┊
+┊  ┊30┊    .attachment-name {
+┊  ┊31┊      color: gray;
+┊  ┊32┊    }
+┊  ┊33┊  }
+┊  ┊34┊
+┊  ┊35┊  .attachment-gallery .attachment-icon {
+┊  ┊36┊    background: linear-gradient(#e13838 50%, #f53d3d 50%);
+┊  ┊37┊  }
+┊  ┊38┊
+┊  ┊39┊  .attachment-camera .attachment-icon {
+┊  ┊40┊    background: linear-gradient(#3474e1 50%, #387ef5 50%);
+┊  ┊41┊  }
+┊  ┊42┊
+┊  ┊43┊  .attachment-location .attachment-icon {
+┊  ┊44┊    background: linear-gradient(#2ec95c 50%, #32db64 50%);
+┊  ┊45┊  }
+┊  ┊46┊}

Step 11.8: Import MessagesAttachmentsComponent

Changed client/imports/app/app.module.ts
@@ -7,6 +7,7 @@
 ┊ 7┊ 7┊import { NewChatComponent } from '../pages/chats/new-chat';
 ┊ 8┊ 8┊import { LoginPage } from '../pages/login/login';
 ┊ 9┊ 9┊import { MessagesPage } from '../pages/messages/messages';
+┊  ┊10┊import { MessagesAttachmentsComponent } from '../pages/messages/messages-attachments';
 ┊10┊11┊import { MessagesOptionsComponent } from '../pages/messages/messages-options';
 ┊11┊12┊import { ProfilePage } from '../pages/profile/profile';
 ┊12┊13┊import { VerificationPage } from '../pages/verification/verification';
@@ -23,7 +24,8 @@
 ┊23┊24┊    ProfilePage,
 ┊24┊25┊    ChatsOptionsComponent,
 ┊25┊26┊    NewChatComponent,
-┊26┊  ┊    MessagesOptionsComponent
+┊  ┊27┊    MessagesOptionsComponent,
+┊  ┊28┊    MessagesAttachmentsComponent
 ┊27┊29┊  ],
 ┊28┊30┊  imports: [
 ┊29┊31┊    IonicModule.forRoot(MyApp),
@@ -42,7 +44,8 @@
 ┊42┊44┊    ProfilePage,
 ┊43┊45┊    ChatsOptionsComponent,
 ┊44┊46┊    NewChatComponent,
-┊45┊  ┊    MessagesOptionsComponent
+┊  ┊47┊    MessagesOptionsComponent,
+┊  ┊48┊    MessagesAttachmentsComponent
 ┊46┊49┊  ],
 ┊47┊50┊  providers: [
 ┊48┊51┊    { provide: ErrorHandler, useClass: IonicErrorHandler },

We will add a generic style-sheet for the attachments menu since it can also use us in the future:

Step 11.9: Added styles for the popover container

Changed client/imports/app/app.scss
@@ -18,3 +18,15 @@
 ┊18┊18┊  left: calc(100% - #{$options-popover-width} - #{$options-popover-margin}) !important;
 ┊19┊19┊  top: $options-popover-margin !important;
 ┊20┊20┊}
+┊  ┊21┊
+┊  ┊22┊// Attachments Popover Component
+┊  ┊23┊// --------------------------------------------------
+┊  ┊24┊
+┊  ┊25┊$attachments-popover-width: 100%;
+┊  ┊26┊
+┊  ┊27┊.attachments-popover .popover-content {
+┊  ┊28┊  width: $attachments-popover-width;
+┊  ┊29┊  transform-origin: 300px 30px !important;
+┊  ┊30┊  left: calc(100% - #{$attachments-popover-width}) !important;
+┊  ┊31┊  top: 58px !important;
+┊  ┊32┊}

Now we will add a handler in the MessagesPage which will open the newly created menu, and we will bind it to the view:

Step 11.1: Add cordova plugin for geolocation

Changed .meteor/cordova-plugins
@@ -1,5 +1,6 @@
 ┊1┊1┊cordova-plugin-console@1.0.5
 ┊2┊2┊cordova-plugin-device@1.1.4
+┊ ┊3┊cordova-plugin-geolocation@2.4.1
 ┊3┊4┊cordova-plugin-splashscreen@4.0.1
 ┊4┊5┊cordova-plugin-statusbar@2.2.1
 ┊5┊6┊cordova-plugin-whitelist@1.3.1

Step 11.11: Bind click event to showAttachments

Changed client/imports/pages/messages/messages.html
@@ -7,7 +7,7 @@
 ┊ 7┊ 7┊    <ion-title class="chat-title">{{title}}</ion-title>
 ┊ 8┊ 8┊
 ┊ 9┊ 9┊    <ion-buttons end>
-┊10┊  ┊      <button ion-button icon-only class="attach-button"><ion-icon name="attach"></ion-icon></button>
+┊  ┊10┊      <button ion-button icon-only class="attach-button" (click)="showAttachments()"><ion-icon name="attach"></ion-icon></button>
 ┊11┊11┊      <button ion-button icon-only class="options-button" (click)="showOptions()"><ion-icon name="more"></ion-icon></button>
 ┊12┊12┊    </ion-buttons>
 ┊13┊13┊  </ion-navbar>

Sending Location

A location is a composition of longitude, latitude and an altitude, or in short: long, lat, alt. Let's define a new Location model which will represent the mentioned schema:

Step 11.12: Added location model

Changed imports/models.ts
@@ -32,4 +32,10 @@
 ┊32┊32┊
 ┊33┊33┊export interface User extends Meteor.User {
 ┊34┊34┊  profile?: Profile;
-┊35┊  ┊}🚫↵
+┊  ┊35┊}
+┊  ┊36┊
+┊  ┊37┊export interface Location {
+┊  ┊38┊  lat: number;
+┊  ┊39┊  lng: number;
+┊  ┊40┊  zoom: number;
+┊  ┊41┊}

Up next, would be implementing the actual component which will handle geo-location sharing:

Step 11.13: Implement location message component

Added client/imports/pages/messages/location-message.ts
@@ -0,0 +1,74 @@
+┊  ┊ 1┊import { Component, OnInit, OnDestroy } from '@angular/core';
+┊  ┊ 2┊import { Platform, ViewController } from 'ionic-angular';
+┊  ┊ 3┊import { Geolocation } from 'ionic-native';
+┊  ┊ 4┊import { Observable, Subscription } from 'rxjs';
+┊  ┊ 5┊import { Location } from '../../../../imports/models';
+┊  ┊ 6┊import template from './location-message.html';
+┊  ┊ 7┊
+┊  ┊ 8┊const DEFAULT_ZOOM = 8;
+┊  ┊ 9┊const EQUATOR = 40075004;
+┊  ┊10┊const DEFAULT_LAT = 51.678418;
+┊  ┊11┊const DEFAULT_LNG = 7.809007;
+┊  ┊12┊const LOCATION_REFRESH_INTERVAL = 500;
+┊  ┊13┊
+┊  ┊14┊@Component({
+┊  ┊15┊  template
+┊  ┊16┊})
+┊  ┊17┊export class NewLocationMessageComponent implements OnInit, OnDestroy {
+┊  ┊18┊  lat: number = DEFAULT_LAT;
+┊  ┊19┊  lng: number = DEFAULT_LNG;
+┊  ┊20┊  zoom: number = DEFAULT_ZOOM;
+┊  ┊21┊  accuracy: number = -1;
+┊  ┊22┊  intervalObs: Subscription;
+┊  ┊23┊
+┊  ┊24┊  constructor(private platform: Platform, private viewCtrl: ViewController) {
+┊  ┊25┊  }
+┊  ┊26┊
+┊  ┊27┊  ngOnInit() {
+┊  ┊28┊    // Refresh location at a specific refresh rate
+┊  ┊29┊    this.intervalObs = this.reloadLocation()
+┊  ┊30┊      .flatMapTo(Observable
+┊  ┊31┊        .interval(LOCATION_REFRESH_INTERVAL)
+┊  ┊32┊        .timeInterval())
+┊  ┊33┊      .subscribe(() => {
+┊  ┊34┊        this.reloadLocation();
+┊  ┊35┊      });
+┊  ┊36┊  }
+┊  ┊37┊
+┊  ┊38┊  ngOnDestroy() {
+┊  ┊39┊    // Dispose subscription
+┊  ┊40┊    if (this.intervalObs) {
+┊  ┊41┊      this.intervalObs.unsubscribe();
+┊  ┊42┊    }
+┊  ┊43┊  }
+┊  ┊44┊
+┊  ┊45┊  calculateZoomByAccureacy(accuracy: number): number {
+┊  ┊46┊    // Source: http://stackoverflow.com/a/25143326
+┊  ┊47┊    const deviceHeight = this.platform.height();
+┊  ┊48┊    const deviceWidth = this.platform.width();
+┊  ┊49┊    const screenSize = Math.min(deviceWidth, deviceHeight);
+┊  ┊50┊    const requiredMpp = accuracy / screenSize;
+┊  ┊51┊
+┊  ┊52┊    return ((Math.log(EQUATOR / (256 * requiredMpp))) / Math.log(2)) + 1;
+┊  ┊53┊  }
+┊  ┊54┊
+┊  ┊55┊  reloadLocation() {
+┊  ┊56┊    return Observable.fromPromise(Geolocation.getCurrentPosition().then((position) => {
+┊  ┊57┊      if (this.lat && this.lng) {
+┊  ┊58┊        // Update view-models to represent the current geo-location
+┊  ┊59┊        this.accuracy = position.coords.accuracy;
+┊  ┊60┊        this.lat = position.coords.latitude;
+┊  ┊61┊        this.lng = position.coords.longitude;
+┊  ┊62┊        this.zoom = this.calculateZoomByAccureacy(this.accuracy);
+┊  ┊63┊      }
+┊  ┊64┊    }));
+┊  ┊65┊  }
+┊  ┊66┊
+┊  ┊67┊  sendLocation() {
+┊  ┊68┊    this.viewCtrl.dismiss(<Location>{
+┊  ┊69┊      lat: this.lat,
+┊  ┊70┊      lng: this.lng,
+┊  ┊71┊      zoom: this.zoom
+┊  ┊72┊    });
+┊  ┊73┊  }
+┊  ┊74┊}

Basically, what this component does is refreshing the current geo-location at a specific refresh rate. Note that in order to fetch the geo-location we use Geolocation's API, but behind the scene it uses ``cordova-plugin-geolocation. The sendLocation` method dismisses the view and returns the calculated geo-location. Now let's added the component's corresponding view:

Step 11.14: Added location message template

Added client/imports/pages/messages/location-message.html
@@ -0,0 +1,22 @@
+┊  ┊ 1┊<ion-header>
+┊  ┊ 2┊  <ion-toolbar color="whatsapp">
+┊  ┊ 3┊    <ion-title>Send Location</ion-title>
+┊  ┊ 4┊
+┊  ┊ 5┊    <ion-buttons end>
+┊  ┊ 6┊      <button ion-button class="dismiss-button" (click)="viewCtrl.dismiss()"><ion-icon name="close"></ion-icon></button>
+┊  ┊ 7┊    </ion-buttons>
+┊  ┊ 8┊  </ion-toolbar>
+┊  ┊ 9┊</ion-header>
+┊  ┊10┊
+┊  ┊11┊<ion-content class="location-message-content">
+┊  ┊12┊  <ion-list>
+┊  ┊13┊    <sebm-google-map [latitude]="lat" [longitude]="lng" [zoom]="zoom">
+┊  ┊14┊      <sebm-google-map-marker [latitude]="lat" [longitude]="lng"></sebm-google-map-marker>
+┊  ┊15┊    </sebm-google-map>
+┊  ┊16┊    <ion-item (click)="sendLocation()">
+┊  ┊17┊      <ion-icon name="compass" item-left></ion-icon>
+┊  ┊18┊      <h2>Send your current location</h2>
+┊  ┊19┊      <p *ngIf="accuracy !== -1">Accurate to {{accuracy}} meters</p>
+┊  ┊20┊    </ion-item>
+┊  ┊21┊  </ion-list>
+┊  ┊22┊</ion-content>

The sebm-google-map is the component which represents the map itself, and we provide it with lat, lng and zoom, so the map can be focused on the current geo-location. If you'll notice, we also used the sebm-google-map-marker component with the same data-models, so the marker will be shown right in the center of the map.

Now we will add some CSS to make sure the map is visible:

Step 11.15: Added location message stylesheet

Added client/imports/pages/messages/location-message.scss
@@ -0,0 +1,14 @@
+┊  ┊ 1┊.location-message-content {
+┊  ┊ 2┊  .scroll-content {
+┊  ┊ 3┊    margin-top: 44px;
+┊  ┊ 4┊  }
+┊  ┊ 5┊
+┊  ┊ 6┊  sebm-google-map {
+┊  ┊ 7┊    padding: 0;
+┊  ┊ 8┊  }
+┊  ┊ 9┊
+┊  ┊10┊  .sebm-google-map-container {
+┊  ┊11┊    height: 300px;
+┊  ┊12┊    margin-top: -15px;
+┊  ┊13┊  }
+┊  ┊14┊}

And we will import the component:

Step 11.16: Import NewLocationMessageComponent

Changed client/imports/app/app.module.ts
@@ -9,6 +9,7 @@
 ┊ 9┊ 9┊import { MessagesPage } from '../pages/messages/messages';
 ┊10┊10┊import { MessagesAttachmentsComponent } from '../pages/messages/messages-attachments';
 ┊11┊11┊import { MessagesOptionsComponent } from '../pages/messages/messages-options';
+┊  ┊12┊import { NewLocationMessageComponent } from '../pages/messages/location-message';
 ┊12┊13┊import { ProfilePage } from '../pages/profile/profile';
 ┊13┊14┊import { VerificationPage } from '../pages/verification/verification';
 ┊14┊15┊import { PhoneService } from '../services/phone';
@@ -25,7 +26,8 @@
 ┊25┊26┊    ChatsOptionsComponent,
 ┊26┊27┊    NewChatComponent,
 ┊27┊28┊    MessagesOptionsComponent,
-┊28┊  ┊    MessagesAttachmentsComponent
+┊  ┊29┊    MessagesAttachmentsComponent,
+┊  ┊30┊    NewLocationMessageComponent
 ┊29┊31┊  ],
 ┊30┊32┊  imports: [
 ┊31┊33┊    IonicModule.forRoot(MyApp),
@@ -45,7 +47,8 @@
 ┊45┊47┊    ChatsOptionsComponent,
 ┊46┊48┊    NewChatComponent,
 ┊47┊49┊    MessagesOptionsComponent,
-┊48┊  ┊    MessagesAttachmentsComponent
+┊  ┊50┊    MessagesAttachmentsComponent,
+┊  ┊51┊    NewLocationMessageComponent
 ┊49┊52┊  ],
 ┊50┊53┊  providers: [
 ┊51┊54┊    { provide: ErrorHandler, useClass: IonicErrorHandler },

The component is ready. The only thing left to do would be revealing it. So we will add the appropriate handler in the MessagesAttachmentsComponent:

Step 11.17: Implement the sendLocation message to display the new location modal

Changed client/imports/pages/messages/messages-attachments.ts
@@ -1,5 +1,7 @@
 ┊1┊1┊import { Component } from '@angular/core';
 ┊2┊2┊import { AlertController, Platform, ModalController, ViewController } from 'ionic-angular';
+┊ ┊3┊import { MessageType } from '../../../../imports/models';
+┊ ┊4┊import { NewLocationMessageComponent } from './location-message';
 ┊3┊5┊import template from './messages-attachments.html';
 ┊4┊6┊
 ┊5┊7┊@Component({
@@ -12,4 +14,22 @@
 ┊12┊14┊    private viewCtrl: ViewController,
 ┊13┊15┊    private modelCtrl: ModalController
 ┊14┊16┊  ) {}
+┊  ┊17┊
+┊  ┊18┊  sendLocation(): void {
+┊  ┊19┊    const locationModal = this.modelCtrl.create(NewLocationMessageComponent);
+┊  ┊20┊    locationModal.onDidDismiss((location) => {
+┊  ┊21┊      if (!location) {
+┊  ┊22┊        this.viewCtrl.dismiss();
+┊  ┊23┊
+┊  ┊24┊        return;
+┊  ┊25┊      }
+┊  ┊26┊
+┊  ┊27┊      this.viewCtrl.dismiss({
+┊  ┊28┊        messageType: MessageType.LOCATION,
+┊  ┊29┊        selectedLocation: location
+┊  ┊30┊      });
+┊  ┊31┊    });
+┊  ┊32┊
+┊  ┊33┊    locationModal.present();
+┊  ┊34┊  }
 ┊15┊35┊}

And we will bind it to its view:

Step 11.18: Bind click event to sendLocation

Changed client/imports/pages/messages/messages-attachments.html
@@ -10,7 +10,7 @@
 ┊10┊10┊      <div class="attachment-name">Camera</div>
 ┊11┊11┊    </button>
 ┊12┊12┊
-┊13┊  ┊    <button ion-item class="attachment attachment-location">
+┊  ┊13┊    <button ion-item class="attachment attachment-location" (click)="sendLocation()">
 ┊14┊14┊      <ion-icon name="locate" class="attachment-icon"></ion-icon>
 ┊15┊15┊      <div class="attachment-name">Location</div>
 ┊16┊16┊    </button>

Now we will implement a new method in the MessagesPage, called sendLocationMessage, which will create a string representation of the current geo-location and send it to the server:

Step 11.19: Implement send location message

Changed client/imports/pages/messages/messages.ts
@@ -5,7 +5,7 @@
 ┊ 5┊ 5┊import * as Moment from 'moment';
 ┊ 6┊ 6┊import { Observable, Subscription, Subscriber } from 'rxjs';
 ┊ 7┊ 7┊import { Messages } from '../../../../imports/collections';
-┊ 8┊  ┊import { Chat, Message, MessageType } from '../../../../imports/models';
+┊  ┊ 8┊import { Chat, Message, MessageType, Location } from '../../../../imports/models';
 ┊ 9┊ 9┊import { MessagesAttachmentsComponent } from './messages-attachments';
 ┊10┊10┊import { MessagesOptionsComponent } from './messages-options';
 ┊11┊11┊import template from './messages.html';
@@ -213,6 +213,16 @@
 ┊213┊213┊    });
 ┊214┊214┊  }
 ┊215┊215┊
+┊   ┊216┊  sendLocationMessage(location: Location): void {
+┊   ┊217┊    MeteorObservable.call('addMessage', MessageType.LOCATION,
+┊   ┊218┊      this.selectedChat._id,
+┊   ┊219┊      `${location.lat},${location.lng},${location.zoom}`
+┊   ┊220┊    ).zone().subscribe(() => {
+┊   ┊221┊      // Zero the input field
+┊   ┊222┊      this.message = '';
+┊   ┊223┊    });
+┊   ┊224┊  }
+┊   ┊225┊
 ┊216┊226┊  showAttachments(): void {
 ┊217┊227┊    const popover = this.popoverCtrl.create(MessagesAttachmentsComponent, {
 ┊218┊228┊      chat: this.selectedChat
@@ -221,7 +231,12 @@
 ┊221┊231┊    });
 ┊222┊232┊
 ┊223┊233┊    popover.onDidDismiss((params) => {
-┊224┊   ┊      // TODO: Handle result
+┊   ┊234┊      if (params) {
+┊   ┊235┊        if (params.messageType === MessageType.LOCATION) {
+┊   ┊236┊          const location = params.selectedLocation;
+┊   ┊237┊          this.sendLocationMessage(location);
+┊   ┊238┊        }
+┊   ┊239┊      }
 ┊225┊240┊    });
 ┊226┊241┊
 ┊227┊242┊    popover.present();

This requires us to update the addMessage method in the server so it can support location typed messages:

Step 11.2: Add angular 2 google maps package

Changed package.json
@@ -15,6 +15,7 @@
 ┊15┊15┊    "@angular/platform-browser-dynamic": "2.2.1",
 ┊16┊16┊    "@angular/platform-server": "2.2.1",
 ┊17┊17┊    "@ionic/storage": "1.1.7",
+┊  ┊18┊    "angular2-google-maps": "^0.17.0",
 ┊18┊19┊    "angular2-moment": "^1.1.0",
 ┊19┊20┊    "babel-runtime": "6.18.0",
 ┊20┊21┊    "ionic-angular": "2.0.0-rc.5",

Viewing Location Messages

The infrastructure is ready, but we can't yet see the message, therefore, we will need to add support for location messages in the MessagesPage view:

Step 11.21: Implement location message view

Changed client/imports/pages/messages/messages.html
@@ -19,6 +19,12 @@
 ┊19┊19┊      <div *ngFor="let message of day.messages" class="message-wrapper">
 ┊20┊20┊        <div [class]="'message message-' + message.ownership">
 ┊21┊21┊          <div *ngIf="message.type == 'text'" class="message-content message-content-text">{{message.content}}</div>
+┊  ┊22┊          <div *ngIf="message.type == 'location'" class="message-content message-content-text">
+┊  ┊23┊            <sebm-google-map [zoom]="getLocation(message.content).zoom" [latitude]="getLocation(message.content).lat" [longitude]="getLocation(message.content).lng">
+┊  ┊24┊              <sebm-google-map-marker [latitude]="getLocation(message.content).lat" [longitude]="getLocation(message.content).lng"></sebm-google-map-marker>
+┊  ┊25┊            </sebm-google-map>
+┊  ┊26┊          </div>
+┊  ┊27┊
 ┊22┊28┊          <span class="message-timestamp">{{ message.createdAt | amDateFormat: 'HH:mm' }}</span>
 ┊23┊29┊        </div>
 ┊24┊30┊      </div>

These additions looks pretty similar to the LocationMessage since they are based on the same core components.

We will now add a method which can parse a string representation of the location into an actual JSON:

Step 11.22: Implement getLocation for parsing the location

Changed client/imports/pages/messages/messages.ts
@@ -241,4 +241,14 @@
 ┊241┊241┊
 ┊242┊242┊    popover.present();
 ┊243┊243┊  }
+┊   ┊244┊
+┊   ┊245┊  getLocation(locationString: string): Location {
+┊   ┊246┊    const splitted = locationString.split(',').map(Number);
+┊   ┊247┊
+┊   ┊248┊    return <Location>{
+┊   ┊249┊      lat: splitted[0],
+┊   ┊250┊      lng: splitted[1],
+┊   ┊251┊      zoom: Math.min(splitted[2] || 0, 19)
+┊   ┊252┊    };
+┊   ┊253┊  }
 ┊244┊254┊}

And we will make some final adjustments for the view so the map can be presented properly:

Step 11.23: Added map styles

Changed client/imports/pages/messages/messages.scss
@@ -93,6 +93,11 @@
 ┊ 93┊ 93┊        content: " \00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0\00a0";
 ┊ 94┊ 94┊        display: inline;
 ┊ 95┊ 95┊      }
+┊   ┊ 96┊
+┊   ┊ 97┊      .sebm-google-map-container {
+┊   ┊ 98┊        height: 25vh;
+┊   ┊ 99┊        width: 35vh;
+┊   ┊100┊      }
 ┊ 96┊101┊    }
 ┊ 97┊102┊
 ┊ 98┊103┊    .message-timestamp {

{: (nav_step next_ref="https://angular-meteor.com/tutorials/whatsapp2/meteor/file-upload" prev_ref="https://angular-meteor.com/tutorials/whatsapp2/meteor/filter-and-pagination")

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