如何使用 firebase 和文档或 window 的导入从 html 文件中获取信息
[英]How to use imports for firebase and document or window to get info from the html file
问题描述
When I use imports enabling type:module in the package json file I can use without problems the imports such as import { ref, set,child,getDatabase,onValue,get,push, update} from "firebase/database";
当我在 package json 文件中使用导入启用类型：模块时，我可以毫无问题地使用导入，例如 import { ref, set,child,getDatabase,onValue,get,push, update} from "firebase/database"; and access the data, but I want to interact with that information with inputs or text areas but I cannot access those it throws document is not defined.!并访问数据，但我想通过输入或文本区域与该信息进行交互，但我无法访问它抛出的那些 document is not defined.!
I have read many pages but as I am new I cannot get it.我已经阅读了很多页，但由于我是新手，所以我无法理解。 I cannot apply the answer to my project.我无法将答案应用到我的项目中。
import { ref, set,child ,getDatabase,onValue,get,push, update} from "firebase/database";
import { getAuth, onAuthStateChanged } from "firebase/auth";
//to get info from firebase
var headbox = document.getElementById('a'); // from Html to manage info send and show it here
var bodybox = document.getElementById('b'); // error when I want to read this
Although if I take those imports out and erase type:module in the package json file, I can use document.getById but I cannot use imports please help me!尽管如果我取出这些导入并擦除 package json 文件中的类型：模块，我可以使用 document.getById 但我不能使用导入请帮助我！ I am new我是新的
2 个解决方案
解决方案1
1 2023-01-21 13:23:16
type: module in package.json is for use in Nodejs environments, hence the error. type: module package.json Nodejs 环境，因此出现错误。 Backend has no document or even window object.后端没有document甚至window object。
What you are doing is frontend, so setting up a frontend environment using vite / webpack (preferably vite ), would do you some justice.你正在做的是前端，所以使用vite / webpack （最好vite ）设置一个前端环境，对你有好处。
vite is really easy to setup for what you are doing. vite真的很容易设置你正在做的事情。 Vite Getting Started Guide . Vite 入门指南。
You just place your index.html at the root of your working folder and run it's commands.您只需将index.html放在工作文件夹的根目录下并运行它的命令。 It loads very quickly.它加载非常快。
解决方案2
0 2023-01-13 11:45:53
The Firebase Web SDK ideally requires module bundlers (Webpack/Rollup) or JavaScript framework tooling like Vue, React, Angular, etc because the Web SDK (or at least version 9) is optimized to work with module bundlers to eliminate unused code (tree-shaking) and decrease SDK size. The Firebase Web SDK ideally requires module bundlers (Webpack/Rollup) or JavaScript framework tooling like Vue, React, Angular, etc because the Web SDK (or at least version 9) is optimized to work with module bundlers to eliminate unused code (tree-晃动）并减小 SDK 大小。
Sounds like you would be better off using CDN (content delivery.network).听起来您最好使用 CDN（内容交付网络）。
JavaScript JavaScript
import { initializeApp } from 'https://www.gstatic.com/firebasejs/9.15.0/firebase-app.js';
import { ref, set, child, getDatabase, onValue, get, push, update } from 'https://www.gstatic.com/firebasejs/9.15.0/firebase-database.js';
import { getAuth, onAuthStateChanged } from 'https://www.gstatic.com/firebasejs/9.15.0/firebase-auth.js';
const firebaseConfig = {
apiKey: 'xxx',
authDomain: 'xxx',
projectId: 'xxx',
storageBucket: 'xxx',
messagingSenderId: 'xxx',
appId: 'xxx',
measurementId: 'xxx'
};
const firebaseApp = initializeApp(firebaseConfig);
const auth = getAuth();
window.addEventListener('DOMContentLoaded', (event) => {
const headbox = document.getElementById('a');
const bodybox = document.getElementById('b');
onAuthStateChanged(auth, (user) => {
if (user) {
// user.uid
}
});
});
HTML HTML
<html>
<head>
...
</head>
<body>
<div id="a">Head Box</div>
<div id="b">Body Box</div>
<script type="module" src="your-javascript-file.js"></script>
</body>
</html>
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