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typescript - 如何在 Aurelia 中使用 BingMaps

转载 作者:搜寻专家 更新时间:2023-10-30 21:30:11 24 4
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我正在为我的应用程序使用 aurelia skeleton typescript webpack 模板。我想将 BingMap 添加到页面并能够添加图钉等。到目前为止,我已经这样做了:

index.html - I added a script tag that loads the map from CDN

<head>
...
<script type='text/javascript' src='http://www.bing.com/api/maps/mapcontrol'></script>
</head>

然后我添加了一个这样的模板:

map.html

<template>
<div id='mainMap' style='width: 100vw; height: 100vh;'></div>
</template>

然后我有了 map Controller :

map.ts

export class Map {

private map: Microsoft.Map.Map;

attached() {
this.map = new Microsoft.Maps.Map('mainMap', { credentials:'mycredentials - omitted'});
...
}
}

现在,如果我启动应用程序,就会显示欢迎屏幕(来自骨架)。然后我单击“ map ”菜单链接, map 页面显示为完全加载的 map 。但是,如果我在浏览器中单击刷新(F5 或 Ctrl+F5),则 map 不再显示并且控制台中显示错误:

bluebird.js:1546 Unhandled rejection TypeError: Cannot read property 'prototype' of null at k (https://www.bing.com/mapspreview/sdk/mapcontrol:11:7096) at h (https://www.bing.com/mapspreview/sdk/mapcontrol:11:6285) at e (https://www.bing.com/mapspreview/sdk/mapcontrol:11:1106) at t.l [as instance] (https://www.bing.com/mapspreview/sdk/mapcontrol:11:161) at h (https://www.bing.com/mapspreview/sdk/mapcontrol:11:6042) at e (https://www.bing.com/mapspreview/sdk/mapcontrol:11:1106) at t.l [as instance] (https://www.bing.com/mapspreview/sdk/mapcontrol:11:161) at new Microsoft.Maps.Map (https://www.bing.com/mapspreview/sdk/mapcontrol:13:4304) at Map.attached (http://localhost:9000/app.bundle.js:31267:20) at Controller.attached (http://localhost:9000/aurelia.bundle.js:6438:22) at View.attached (http://localhost:9000/aurelia.bundle.js:4524:23) at ViewSlot.attached (http://localhost:9000/aurelia.bundle.js:4883:13) at View.attached (http://localhost:9000/aurelia.bundle.js:4534:19) at ViewSlot.attached (http://localhost:9000/aurelia.bundle.js:4883:13) at http://localhost:9000/aurelia.bundle.js:14717:28

当它试图在 map Controller 的 Attached 事件中实例化 Map 对象时抛出此错误。

为什么会发生这种情况,我该如何解决?请帮忙

谢谢

最佳答案

解决这个问题的关键是使用 API 允许我们在脚本 url 中指定的 callback 参数。我创建了一个自定义元素来执行此操作。最初加载模块时加载脚本。自定义元素的任何实例都将等待调用回调函数。我最初使用的是带有 MutationObserver 和数据属性的复杂设置,但在与 Jeremy Danyow 交谈后,他指出“Promisifying”回调将更简单地解决解决方案。这个更简单的解决方案如下所示。

除了获取 map 的当前中心点外,自定义元素目前不提供任何与 map 交互的 API,但它是一个很好的起点,可以帮助您。

bing-map.ts

import { bindable, bindingMode, inlineView } from 'aurelia-framework';

const controlUrl = '//www.bing.com/api/maps/mapcontrol?callback=bingMapsLoaded';
const ready = new Promise(resolve => window['bingMapsLoaded'] = resolve);

let scriptTag: HTMLScriptElement = document.createElement('script');

scriptTag.async = true;
scriptTag.defer = true;
scriptTag.src = controlUrl;

document.head.appendChild(scriptTag);

@inlineView('<template><div ref="container" css="width: ${width}; height: ${height};"></div></template>')
export class BingMapCustomElement {
private container: HTMLElement;
private map: Microsoft.Maps.Map;
private viewChangeHandler: Microsoft.Maps.IHandlerId;

@bindable apiKey = '';
@bindable height = '600px';
@bindable width = '400px';

@bindable({ defaultBindingMode: bindingMode.twoWay }) location: Microsoft.Maps.Location | string;

attached() {
return ready.then(() => {
this.map = new Microsoft.Maps.Map(this.container as HTMLElement, {
credentials: this.apiKey
});

this.location = this.map.getCenter();

this.viewChangeHandler = Microsoft.Maps.Events.addHandler(this.map, 'viewchange', e => {
this.location = this.map.getCenter();
});
});
}

detached() {
if (this.viewChangeHandler) {
Microsoft.Maps.Events.removeHandler(this.viewChangeHandler);
}

if (this.map) {
this.map.dispose();
this.map = null;
}
}
}

用法

<bing-map api-key.bind="mapsApiKey" width="100px" height="100px"></bing-map>

关于typescript - 如何在 Aurelia 中使用 BingMaps,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41162142/

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