[英]Connect web with firebase realtime database
I am trying to make a webpage that can link with firebase database.我正在尝试制作一个可以与 firebase 数据库链接的网页。 When i run my program, there are 2 errors when i run my code:
当我运行我的程序时,运行我的代码时出现 2 个错误:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Firebase - Client Side </title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<link rel="stylesheet" href="styles.css">
</head>
<body>
<main>
<form>
<label for="tokenId">Token ID</label><br>
<input type="text" name="tokenId" id="tokenId"><br>
<label for="name">Name</label><br>
<input type="text" name="name" id="name"><br>
<label for="desc">Description</label><br>
<input type="text" name="desc" id="description"><br>
<label for="add">Address</label><br>
<input type="text" name="address" id="address"><br>
<button id="addBtn" class="btn waves-effect waves-light">Add</button>
<button id="updateBtn" class="btn waves-effect waves-light">Update</button>
<button id="removeBtn" class="btn waves-effect red-darken-1">Remove</button>
</form>
</main>
<script src="https://www.gstatic.com/firebasejs/7.21.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/7.21.0/firebase-database.js"></script>
<script>
var firebaseConfig = {
apiKey: "APIKEY",
authDomain: "firebaseapp.com",
databaseURL: "https://firebasedatabase.app",
projected: "firebase",
storageBucket: "firebase.appspot.com",
messagingSenderId: "123",
appId: "123",
measurementId: "123"
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
// Get a reference to the database service
const database = getDatabase(app);
</script>
<script type = "text/javascript" src="functions.js"></script>
</body>
</html>
const tokenId = document.getElementById("tokenId");
const name = document.getElementById("name");
const description = document.getElementById("description");
const address = document.getElementById("address");
const addBtn = document.getElementById("addBtn");
const updateBtn = document.getElementById("updateBtn");
const removeBtn = document.getElementById("removeBtn");
const database = firebase.database();
const rootRef = database.ref('tokens');
addBtn.addEventListener('click', (e) => {
e.preventDefault();
rootRef.child('tokens').set({
token_id: tokenid.value,
Name: name.value,
Desc: description.value,
Address: address.value
});
});
* {
padding: 0;
margin: 0;
}
main {
width: 100vw;
height: 100vh;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
form {
width: 400px;
border: 1px solid #EBEBEB;
padding: 5rem;
}
button {
margin-top: 2rem;
}
This is how I want my dataset to look like in firebase这就是我希望我的数据集在 firebase 中的样子
{
"tokens": {
"0": {
"tokenid":"E3",
"name": "H",
"description":"Nice Food"
"address":"A"
},
"1": {
"tokenid":"E1",
"name": "B",
"description":"Nice Food"
"address":"A"
},
"2": {
"tokenid":"C1",
"name": "B",
"description":"Nice Food."
"address":"A"
}
}
}
You're importing version 7 of the Firebase SDK, so you need to use namespaced syntax from the documentation.您正在导入 Firebase SDK 的版本 7,因此您需要使用文档中的命名空间语法。 You're doing that in
firebase.initializeApp(firebaseConfig)
, but not in const database = getDatabase(app)
.您在
firebase.initializeApp(firebaseConfig)
中这样做,但不是在const database = getDatabase(app)
中。
For version 8 and before, the equivalent is:对于版本 8 及之前的版本,等效为:
const database = firebase.database();
Also see the Firebase documentation on reading and writing from/to the database , which has examples in both the v8-and-before and the v9-and-after syntax.另请参阅 Firebase 关于从/向数据库读取和写入的文档,其中包含 v8-and-before 和 v9-and-after 语法的示例。
Update since you already declare const database = firebase.database();
更新,因为您已经声明
const database = firebase.database();
in functions.js, redeclaring it in the JavaScript block in your HTML is a syntax error.在 functions.js 中,在 HTML 的 JavaScript 块中重新声明它是一个语法错误。
A simple solution to fix that:一个简单的解决方案来解决这个问题:
...
// 👇 Remove these
// const database = firebase.database();
// const rootRef = database.ref('tokens');
addBtn.addEventListener('click', (e) => {
e.preventDefault();
// 👇 Change this
firebase.database().ref('tokens').set({
token_id: tokenid.value,
Name: name.value,
Desc: description.value,
Address: address.value
});
});
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