Google Places 自动完成 React 组件
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【中文标题】Google Places 自动完成 React 组件【英文标题】：Google Places Autocomplete React Component 【发布时间】：2017-07-10 01:25:18 【问题描述】：我正在学习 react 并尝试创建一个 Google Places 自动完成组件，在 Rails 应用程序中使用 react on rails gem。这是我目前所拥有的，需要一些帮助来完成它。
我认为我在正确加载 Google javascript 库时遇到了问题。请参阅下面控制台的错误消息（注意我的应用程序中运行了正确的 [KEY]）。
Navigated to https://react-on-rails-basic-tutorial-mcl282.c9users.io/
js?key=[KEY]&libraries=places&callback=initAutocomplete:102 Uncaught Yc message: "initAutocomplete is not a function", name: "InvalidValueError", stack: "Error↵ at new Yc (https://maps.googleapis.com/m…libraries=places&callback=initAutocomplete:139:73"
Yg @ js?key=[KEY]&libraries=places&callback=initAutocomplete:102
(anonymous) @ js?key=[KEY]&libraries=places&callback=initAutocomplete:139
google.maps.Load @ js?key=[KEY]&libraries=places&callback=initAutocomplete:21
(anonymous) @ js?key=[KEY]&libraries=places&callback=initAutocomplete:138
(anonymous) @ js?key=[KEY]&libraries=places&callback=initAutocomplete:139
createReactElement.js?74ab:40 RENDERED GoogleAutoComplete to dom node with id: GoogleAutoComplete-react-component-f9a3e037-df00-4f35-9a7c-103c33b1208e with props, railsContext: Object text: "google autocomplete" Object inMailer: false, i18nLocale: "en", i18nDefaultLocale: "en", href: "https://react-on-rails-basic-tutorial-mcl282.c9users.io/", location: "/"…
clientStartup.js?0ac5:149 Uncaught TypeError: ReactOnRails encountered an error while rendering component: GoogleAutoComplete.Original message: Cannot read property 'Autocomplete' of undefined
at GoogleAutoComplete.initAutocomplete (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:3586), <anonymous>:44:48)
at GoogleAutoComplete.componentDidMount (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:3586), <anonymous>:38:12)
at eval (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:2842), <anonymous>:265:25)
at measureLifeCyclePerf (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:2842), <anonymous>:75:12)
at eval (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:2842), <anonymous>:264:11)
at CallbackQueue.notifyAll (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:2296), <anonymous>:76:22)
at ReactReconcileTransaction.close (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:3004), <anonymous>:80:26)
at ReactReconcileTransaction.closeAll (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:2398), <anonymous>:206:25)
at ReactReconcileTransaction.perform (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:2398), <anonymous>:153:16)
at batchedMountComponentIntoNode (eval at <anonymous> (webpack-bundle.self-cdcd22e….js?body=1:3130), <anonymous>:126:15)
以下是相关代码：
index.html.erb
<html>
<body>
<%= react_component("GoogleAutoComplete") %>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAnhYQqHo2V5AcFpcKKPX6rz0bVrw7xmZg&libraries=places&callback=initAutocomplete"
></script>
</body>
</html>
GoogleAutoComplete.jsx
import React, PropTypes from 'react';
export default class GoogleAutoComplete extends React.Component
static propTypes =
constructor(props)
super(props);
this.state =
autocomplete:
componentDidMount()
this.initAutocomplete();
initAutocomplete()
// eslint-disable-next-line no-undef
const autocomplete = new google.maps.places.Autocomplete((this.refs.autoCompletePlaces), types: ['geocode']);
autocomplete.addListener('place_changed', this.fillInAddress);
this.setState( autocomplete );
geolocate()
if (navigator.geolocation)
navigator.geolocation.getCurrentPosition(function(position)
const geolocation =
lat: position.coords.latitude,
lng: position.coords.longitude
;
);
fillInAddress()
const componentForm =
street_number: 'short_name',
route: 'long_name',
locality: 'long_name',
administrative_area_level_1: 'short_name',
country: 'long_name',
postal_code: 'short_name'
;
// Get the place details from the autocomplete object.
const place = autocomplete.getPlace();
for (let component in componentForm)
this.refs.component.value = '';
this.refs.component.disabled = false;
// Get each component of the address from the place details
// and fill the corresponding field on the form.
for (let i = 0; i < place.address_components.length; i++)
const addressType = place.address_components[i].types[0];
if (componentForm[addressType])
const val = place.address_components[i][componentForm[addressType]];
this.refs.addressType.value = val;
render()
return (
<div>
<div id="locationField">
<input
id="autocomplete"
placeholder="Enter your address"
onFocus=this.geolocate
onChange=this.handleInputChange
ref="autoCompletePlaces"
/>
</div>
<table id="address">
<tbody>
<tr>
<td>Street address</td>
<td>
<input
id="street_number"
disabled="true"/>
</td>
<td>
<input
id="route"
disabled="true"/>
</td>
</tr>
<tr>
<td>City</td>
<td>
<input
id="locality"
disabled="true"/>
</td>
</tr>
<tr>
<td>State</td>
<td>
<input
id="administrative_area_level_1"
disabled="true"/>
</td>
<td>Zip code</td>
<td>
<input
id="postal_code"
disabled="true"/>
</td>
</tr>
<tr>
<td>Country</td>
<td>
<input
id="country"
disabled="true"/>
</td>
</tr>
</tbody>
</table>
</div>
);
【问题讨论】：
嗨迈克尔，我知道这是一篇旧帖子，但在您的问题中的 html 脚本中有一个 API 密钥 - 可能值得编辑和删除它:)。如果你想用它作为一个反应钩子，我有一个帖子可以帮助创建/使用这个钩子和谷歌的地方自动完成服务：atomizedobjects.com/blog/react/… 【参考方案1】：发生错误是因为initComplete() 在全局范围内不可用。 initComplete() 是 React 组件方法，不能在组件外调用。
要将callback 参数传递给Google Maps API，您需要异步加载库，而不是像以前那样使用<script> 标记。
请查看以下存储库，了解它们如何处理 Google 地图库的异步加载。
https://github.com/fullstackreact/google-maps-react
【讨论】：
我想我理解了这里的概念，需要在其中加载带有 Google Maps API 脚本的高阶组件，为组件提供我所需要的功能。但是，我真的不明白如何实现它。他们给出了这个代码示例：'import GoogleApiWrapper from 'GoogleMapsReactComponent' // ... export class Container extends React.Component export default GoogleApiWrapper( apiKey: GAPI_KEY )(Container)'如何使用我的 GoogleAutoComplete.jsx 组件实现这一点？ @MichaelLeeGoogleApiWrapper 组件将 loaded 属性传递给被包装的组件。仅在加载库后，此道具才设置为 true。当一个 prop 发生变化时，被包裹的组件会再次渲染自己，你可以在componentDidMount() 中检查loaded 是否为真，如果为真则调用initAutocomplete()。
这行得通！真正让我感到困惑的一件事是博客有错误，请参阅此链接：github.com/fullstackreact/google-maps-react/issues/18;
我也在尝试这样做并理解概念上正在发生的事情，但不知道如何实现它 - ***.com/questions/46780770/… - 你有什么建议吗？看起来您链接到的库有一个特定于它的帮助程序，并且由于一段时间内 repo 上没有任何活动，我宁愿不包含它。以上是关于Google Places 自动完成 React 组件的主要内容，如果未能解决你的问题，请参考以下文章
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