I'm trying to create a project using JavaScript and a firebase realtime database. Now I want to list the data from the database on the page. But I can't try my code because I get this error:
Uncaught TypeError: firebase.database is not a function at index.html:69
My code at line 69:
const issuesRef = firebase.database().ref('student/');
And this is my whole code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Project</title>
</head>
<body>
<button id="Insbtn">List items</button>
<script src="https://cdnjs.cloudflare.com/ajax/libs/firebase/8.2.2/firebase-app.js">
</script>
<script type="module">
// Import the functions you need from the SDKs you need
import { initializeApp } from "https://www.gstatic.com/firebasejs/9.1.0/firebase-app.js";
// TODO: Add SDKs for Firebase products that you want to use
// https://firebase.google.com/docs/web/setup#available-libraries
// Your web app's Firebase configuration
const firebaseConfig = {
apiKey: "...",
authDomain: "...",
databaseURL: "...",
projectId: "...",
storageBucket: "...",
messagingSenderId: "...",
appId: "..."
};
// Initialize Firebase
const app = initializeApp(firebaseConfig);
import { getDatabase, ref, set, child, update, remove, onValue } from "https://www.gstatic.com/firebasejs/9.1.0/firebase-database.js";
const db = getDatabase();
const issuesRef = firebase.database().ref('student/');
function readIssues() {
issuesRef.on("value", function(snapshot) {
snapshot.forEach(snap => {
const issue = snap.val();
console.log(issue.NameOfStd);
})
}
)}
var insBtn = document.getElementById("Insbtn");
insBtn.addEventListener('click', readIssues);
</script>
</body>
</html>
You are using the new Modular SDK but using older name-spaced syntax to create a DatabaseReference and listening to it. Try refactoring the code as shown below:
import { getDatabase, ref, set, child, update, remove, onValue } from "https://www.gstatic.com/firebasejs/9.1.0/firebase-database.js";
const db = getDatabase();
const issuesRef = ref(db, 'student');
function readIssues() {
onValue(issuesRef, (snapshot) => {
snapshot.forEach(snap => {
const issue = snap.val();
console.log(issue.NameOfStd);
})
});
The documentation has examples of both name-spaced and functional syntax.