HTML DOM indexedDB open() Method

Last Updated : 31 Jul, 2020

The open() method of the indexedDB interface requests opening a connection to a database. This method returns an IDBOpenDBRequest object immediately and performs the open operation asynchronously.

Syntax:

var IDBOpenDBRequest = indexedDB.open(name);
// Or
var IDBOpenDBRequest = indexedDB.open(name, version);

Parameters: This method accepts two parameters as mentioned above and described below:

name: The name of the database to be opened.
version (Optional): The version to open the database with.

Return value: This method returns a IDBOpenDBRequest object.

Example: In this example, we will open a database named “toDoList” using this method.

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>indexedDB open() method</title> 
</head> 
<body style="text-align: center;"> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <p> 
        HTML | indexedDB open() method 
    </p> 
  
    <button onclick="Geeks()"> 
        Click Here 
    </button> 
    <p id="a"></p> 
  
    <script> 
    var a = document.getElementById("a"); 
    function Geeks() { 
        window.indexedDB = window.indexedDB ||  
                           window.mozIndexedDB || 
                           window.webkitIndexedDB || 
                           window.msIndexedDB 
        window.IDBTransaction = window.IDBTransaction ||  
                                window.webkitIDBTransaction ||  
                                window.msIDBTransaction; 
        window.IDBKeyRange = window.IDBKeyRange ||  
                             window.webkitIDBKeyRange || 
                             window.msIDBKeyRange 
        var DBOpen = window.indexedDB.open("toDoList", 4); 
  
        DBOpen.onerror = function (event) { 
            a.innerHTML += "<li>Error loading database.</li>"; 
        }; 
  
        DBOpen.onsuccess = function (event) { 
            a.innerHTML += "<li>Database initialised.</li>"; 
            console.log(DBOpen); 
            console.log(window.indexedDB.databases()); 
        }; 
    } 
    </script> 
</body> 
</html> 