html - 如何从 Firebase 虚拟主机读取 Firebase 数据库?
问题描述
我是 Firebase 托管的新手,我想从网络上读取数据。我在 Firebase 中的数据库如下所示:
{
"contactos" : {
"-MGcSVviK2nxd52KNtZ" : {
"email" : "david@hotmail.com",
"fecha" : 1599480318009,
"nombre" : "David R",
},
"-RTcnLta8ud8Dw168oLS" : {
"email" : "roger@hotmail.com",
"fecha" : 1599486127716,
"nombre" : "Roger H",
}
}
}
我安装了 Firebase 工具并初始化了创建 index.html 文件的项目,该文件警告我配置成功......
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Welcome to Firebase Hosting</title>
<!-- update the version number as needed -->
<script defer src="/__/firebase/8.2.1/firebase-app.js"></script>
<!-- include only the Firebase features as you need -->
<script defer src="/__/firebase/8.2.1/firebase-auth.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-database.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-firestore.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-functions.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-messaging.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-storage.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-analytics.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-remote-config.js"></script>
<script defer src="/__/firebase/8.2.1/firebase-performance.js"></script>
<!--
initialize the SDK after all desired features are loaded, set useEmulator to false
to avoid connecting the SDK to running emulators.
-->
<script defer src="/__/firebase/init.js?useEmulator=true"></script>
<style media="screen">
body { background: #ECEFF1; color: rgba(0,0,0,0.87); font-family: Roboto, Helvetica, Arial, sans-serif; margin: 0; padding: 0; }
#message { background: white; max-width: 360px; margin: 100px auto 16px; padding: 32px 24px; border-radius: 3px; }
#message h2 { color: #ffa100; font-weight: bold; font-size: 16px; margin: 0 0 8px; }
#message h1 { font-size: 22px; font-weight: 300; color: rgba(0,0,0,0.6); margin: 0 0 16px;}
#message p { line-height: 140%; margin: 16px 0 24px; font-size: 14px; }
#message a { display: block; text-align: center; background: #039be5; text-transform: uppercase; text-decoration: none; color: white; padding: 16px; border-radius: 4px; }
#message, #message a { box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); }
#load { color: rgba(0,0,0,0.4); text-align: center; font-size: 13px; }
@media (max-width: 600px) {
body, #message { margin-top: 0; background: white; box-shadow: none; }
body { border-top: 16px solid #ffa100; }
}
</style>
</head>
<body>
<div id="message">
<h2>Welcome</h2>
<h1>Firebase Hosting Setup Complete</h1>
<p>You're seeing this because you've successfully setup Firebase Hosting. Now it's time to go build something extraordinary!</p>
<a target="_blank" href="https://firebase.google.com/docs/hosting/">Open Hosting Documentation</a>
</div>
<p id="load">Firebase SDK Loading…</p>
<script>
document.addEventListener('DOMContentLoaded', function() {
const loadEl = document.querySelector('#load');
// //
// // The Firebase SDK is initialized and available here!
//
// firebase.auth().onAuthStateChanged(user => { });
// firebase.database().ref('/path/to/ref').on('value', snapshot => { });
// firebase.firestore().doc('/foo/bar').get().then(() => { });
// firebase.functions().httpsCallable('yourFunction')().then(() => { });
// firebase.messaging().requestPermission().then(() => { });
// firebase.storage().ref('/path/to/ref').getDownloadURL().then(() => { });
// firebase.analytics(); // call to activate
// firebase.analytics().logEvent('tutorial_completed');
// firebase.performance(); // call to activate
//
// //
try {
let app = firebase.app();
let features = [
'auth',
'database',
'firestore',
'functions',
'messaging',
'storage',
'analytics',
'remoteConfig',
'performance',
].filter(feature => typeof app[feature] === 'function');
loadEl.textContent = `Firebase SDK loaded with ${features.join(', ')}`;
} catch (e) {
console.error(e);
loadEl.textContent = 'Error loading the Firebase SDK, check the console.';
}
});
</script>
</body>
</html>
我想做的是在 url 类型中
https://defaultname.web.app/-MGcSVviK2nxd52KNtZ
或者
https://defaultname.web.app/contactos?id=-MGcSVviK2nxd52KNtZ
任何人都可以读取链接到该对象的基本数据,在这种情况下:
电子邮件david@hotmail.com
日期1599480318009
姓名大卫 R
我的基本问题是:我需要使用 Java Script 吗?如何编写文件以在 Firebase 中读取并以 html 显示?如何使用url中的参数?
解决方案
是的,您需要执行 Javascript 来为您的应用程序设置路由才能做到这一点
您可以创建一个路由器来为您处理此问题。
深入了解以下内容:
const ContactosComponent = {
render: async() => {
// imagine location.pathname being equal to /contactos/<id>
const contactoId = location.pathname.split('/').pop()
// retrieve contacto info
const contacto = (await firebase.firestore().collection('contactos').doc(contactoId).get()).data()
return `<span> Hello ${contacto.nombre}</span>`
}
}
// here you declare the routes of your application
const routes = [
{
path: '/contactos',
component: ContactosComponent
}
]
// a function to find the specific route that your user requests
const findComponentByPath = (path) => routes.find(r => r.path.match(new RegExp(`^\\${path}$`, 'gm')))
const redirectTo = async (path) => {
console.log('path', path)
const { component /* = ErrorComponent */ } = findComponentByPath(path) || {}
console.log('component', component)
// ATTENTION: you need to have a div with this id into your html
document.getElementById('app').innerHTML = await component.render()
}
const router = () => {
const path = location.pathname
redirectTo(path)
}
然后您将跟踪您的路由更改并将它们发送到路由器,如下所示:
document.addEventListener('DOMContentLoaded', function() {
window.addEventListener('hashchange', router)
window.addEventListener('load', router)
...
有关更多信息,请深入阅读本教程
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