AngularJS 无法加载 Bing 地图
AngularJS fails to load Bing Maps
我正在使用 AngularJS 显示 Bing 地图,但错误显示 "TypeError: Cannot read property 'prototype' of null"。请往下看。
在我的 Razor 视图文件中有以下内容:
<script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>
<script type="text/javascript" src="~/lib/angular/angular.min.js"></script>
<script src="~/js/Site.js"></script>
----
----
--
<div ng-app="myDisplayItems">
<div ng-controller="myDisplayItemsController">
<div id="myMap"></div>
</div>
</div>
在我的 JavaScript 文件中有:
var displayItems = angular.module("myDisplayItems", []);
displayItems.controller("myDisplayItemsController", function myDisplayItemsController($scope) {
showMap();
});
function showMap() {
var key = "######";
var map = new Microsoft.Maps.Map('#myMap', {
credentials: key,
zoom: 3
});
}
更新:
var displayItems = angular.module("myDisplayItems", []);
displayItems.controller("myDisplayItemsController", function myDisplayItemsController($scope) {
$scope.map = null;
$scope.init = function () {
$scope.map = showMap();
};
angular.element(document).ready(function () {
$scope.init();
});
});
显然发生此错误是因为 Bing 地图库在地图初始化后 尚未准备就绪 。
没有错误发生,是 showMap
函数在一些延迟后被调用(假设 Bing 地图库在那一刻已经加载),例如这样的:
$timeout(function() { $scope.initMap()}, 2000);
但我会提出以下解决方案:
注册需要触发一次的函数Bing地图库就绪,像这样:
Microsoft.Maps.CallbackOnLoad = "initMap";
并声明initMap
一个全局函数:
$window.showMap = function () {
//...
}
演示
angular.module('mapApp', []);
angular
.module('mapApp')
.controller('MapController', MapController);
function MapController($scope, $window) {
$window.initMap = function () {
let map = new window.Microsoft.Maps.Map(
document.getElementById('myMap'), {
credentials: 'AjwUEXFZA8SMyy8CaJj59vJKVDoWohNXVFz_uGyHlT8N40Jgr-zrhvcxbTNRyDqn'
});
map.setView({
zoom: 6,
center: new Microsoft.Maps.Location(52.406978607177734, -1.5077600479125977)
});
}
Microsoft.Maps.CallbackOnLoad = "initMap";
}
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>
<script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>
<div ng-app="mapApp" ng-controller="MapController">
<div id="myMap" style="width:600px;height:400px;"></div>
</div>
我正在使用 AngularJS 显示 Bing 地图,但错误显示 "TypeError: Cannot read property 'prototype' of null"。请往下看。
在我的 Razor 视图文件中有以下内容:
<script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>
<script type="text/javascript" src="~/lib/angular/angular.min.js"></script>
<script src="~/js/Site.js"></script>
----
----
--
<div ng-app="myDisplayItems">
<div ng-controller="myDisplayItemsController">
<div id="myMap"></div>
</div>
</div>
在我的 JavaScript 文件中有:
var displayItems = angular.module("myDisplayItems", []);
displayItems.controller("myDisplayItemsController", function myDisplayItemsController($scope) {
showMap();
});
function showMap() {
var key = "######";
var map = new Microsoft.Maps.Map('#myMap', {
credentials: key,
zoom: 3
});
}
更新:
var displayItems = angular.module("myDisplayItems", []);
displayItems.controller("myDisplayItemsController", function myDisplayItemsController($scope) {
$scope.map = null;
$scope.init = function () {
$scope.map = showMap();
};
angular.element(document).ready(function () {
$scope.init();
});
});
显然发生此错误是因为 Bing 地图库在地图初始化后 尚未准备就绪 。
没有错误发生,是 showMap
函数在一些延迟后被调用(假设 Bing 地图库在那一刻已经加载),例如这样的:
$timeout(function() { $scope.initMap()}, 2000);
但我会提出以下解决方案:
注册需要触发一次的函数Bing地图库就绪,像这样:
Microsoft.Maps.CallbackOnLoad = "initMap";
并声明initMap
一个全局函数:
$window.showMap = function () {
//...
}
演示
angular.module('mapApp', []);
angular
.module('mapApp')
.controller('MapController', MapController);
function MapController($scope, $window) {
$window.initMap = function () {
let map = new window.Microsoft.Maps.Map(
document.getElementById('myMap'), {
credentials: 'AjwUEXFZA8SMyy8CaJj59vJKVDoWohNXVFz_uGyHlT8N40Jgr-zrhvcxbTNRyDqn'
});
map.setView({
zoom: 6,
center: new Microsoft.Maps.Location(52.406978607177734, -1.5077600479125977)
});
}
Microsoft.Maps.CallbackOnLoad = "initMap";
}
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>
<script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>
<div ng-app="mapApp" ng-controller="MapController">
<div id="myMap" style="width:600px;height:400px;"></div>
</div>