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KnockoutJSライブラリを使用して簡単なGoogleマップアプリを開発しています。 KnockoutJSを読んでいくつかの例を試してみたら、最初の部分をまとめました。これまでのHTMLは単なる地図ですが、私は最初のハードルを乗り越えるとすぐにリストを作成することを目指しています。ハードルはJavascriptにあります。ここでは、参照用のコードは次のとおりです。KnockoutJSのViewModelにアクセスできないグローバル変数
Uncaught ReferenceError: google is not defined
at MapViewModel.getNearbyLocations
、それはここでは認識されていない理由マップ自体は問題なく最初にロードしたとき、私は、得ることはありませんが、ここでそれはのを取得：
"use strict";
var map;
var center;
var defaultBounds;
var placesServices;
//LocationObject created to hold data for locations generated from google.places.nearbySearch
var LocationObject = function(data){
this.position = data.geometry.location;
this.lat = data.geometry.location.lat;
this.lng = data.geometry.location.lng;
this.name = data.name;
this.placeID = data.place_id;
this.rating = data.rating;
this.types = data.types;
this.linkToPhoto = data.html_attributions;
};
function initMap(){
map = new google.maps.Map(document.getElementById('map'), {
center: center,
zoom: 17,
mapTypeId: 'satellite',
draggable: true,
zoomControl: false,
scrollwheel: true,
disableDoubleClickZoom: true
});
defaultBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(47.614217, -122.317981),new google.maps.LatLng(47.612975, -122.316291));
map.fitBounds(defaultBounds);
placesServices = new google.maps.places.PlacesService(map);
}
//ViewModel created to observe changes on the map
var MapViewModel = function(){
var self = this;
self.testarr = ko.observableArray([
{ firstName: 'Bert', lastName: 'Bertington' },
{ firstName: 'Charles', lastName: 'Charlesforth' },
{ firstName: 'Denise', lastName: 'Dentiste' }
]);
self.locations = ko.observableArray([]);
self.markers = [];
this.getNearbyLocations = function(){
if(placesServices === undefined){
placesServices = new google.maps.places.PlacesService(map);
}
var request = {
location: center,
radius: getBoundsRadius(defaultBounds),
type: ['establishment']
};
placesServices.nearbySearch(request, function(results, status) {
if (status === google.maps.places.PlacesServiceStatus.OK) {
for (var i = 0; i <= 18; i++) {
var marker = new google.maps.Marker({
map: map,
position: results[i].geometry.location,
animation: google.maps.Animation.DROP
});
self.locations.push(new LocationObject(results[i]));
self.markers.push(marker);
}
} else{
alert("We were not able to find any nearby locations in this Neighbourhood.");
}
});
};
this.init = function(){
self.getNearbyLocations();
};
};
var myMapViewModel = new MapViewModel();
myMapViewModel.init();
ko.applyBindings(myMapViewModel);
/* Utility Functions */
function getBoundsRadius(bounds){....}
エラーがありますハングアップ。ここで
は参照用のHTMLですが、そこに問題があってはならない。私はまた、あなたのapp.jsをマップする前に呼び出されているため、エラーがあったと思っ<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Per Google guideline scheduled for the M65 release, css has been moved to an importer -->
<link rel="import" href="importer.htm"></link>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-xs-12 col-md-4">
<!-- List goes in this column. -->
</div>
</div>
<div class="col-xs-12 col-md-8">
<!-- Map goes into this column. -->
<div id="map" style="width:100%;height:100vh;"></div>
</div>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
<!-- Optional JavaScript -->
<script src="js/knockout.js" ></script>
<script src="js/app.js"></script>
<script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyC-1EdIyUOb74oGG_mEoPvJTAGCSJvSQms&callback=initMap&libraries=places"></script>
</body>
てみます。また、チェックアウトする場合がありますapp.js' – adiga
'前に、マップのスクリプト参照を追加します[この質問に答える]（https://stackoverflow.com/questions/38627259/how-to-make-a-callback-to-google-maps-init-in-separate-files-of-a-web-app ） – user3297291