IDBOpenDBRequest

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

Note: This feature is available in Web Workers.

The IDBOpenDBRequest interface of the IndexedDB API provides access to the results of requests to open or delete databases (performed using IDBFactory.open and IDBFactory.deleteDatabase), using specific event handler attributes.

EventTarget IDBRequest IDBOpenDBRequest

Instance properties

Also inherits properties from its parents IDBRequest and EventTarget.

Instance methods

No methods, but inherits methods from its parents IDBRequest and EventTarget.

Events

Events defined on parent interfaces, IDBRequest and EventTarget, can also be dispatched on IDBOpenDBRequest objects.

Listen to these generic and specific events using addEventListener() or by assigning an event listener to the oneventname property of this interface.

Events specific to this interface are:

blocked

Fired when an open connection to a database is blocking a versionchange transaction on the same database. Also available via the onblocked property.

upgradeneeded

Fired when an attempt was made to open a database with a version number higher than its current version. Also available via the onupgradeneeded property.

Example

In the following example you can see the onupgradeneeded handler being used to update the database structure if a database with a higher version number is loaded. For a full working example, see our To-do Notifications app (view example live.)

js
let db;

// Let us open our database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);

// these event handlers act on the database being opened.
DBOpenRequest.onerror = (event) => {
  note.appendChild(document.createElement("li")).textContent =
    "Error loading database.";
};

DBOpenRequest.onsuccess = (event) => {
  note.appendChild(document.createElement("li")).textContent =
    "Database initialized.";

  // store the result of opening the database in the db
  // variable. This is used a lot below
  db = DBOpenRequest.result;

  // Run the displayData() function to populate the task
  // list with all the to-do list data already in the IDB
  displayData();
};

// This event handles the event whereby a new version of
// the database needs to be created Either one has not
// been created before, or a new version number has been
// submitted via the window.indexedDB.open line above
// it is only implemented in recent browsers
DBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;

  db.onerror = (event) => {
    note.appendChild(document.createElement("li")).textContent =
      "Error loading database.";
  };

  // Create an objectStore for this database
  const objectStore = db.createObjectStore("toDoList", {
    keyPath: "taskTitle",
  });

  // define what data items the objectStore will contain

  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });
  objectStore.createIndex("notified", "notified", { unique: false });
};

Specifications

Specification
Indexed Database API 3.0
# idbopendbrequest

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
IDBOpenDBRequest
blocked event
upgradeneeded event
Available in workers

Legend

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Full support
Full support
Requires a vendor prefix or different name for use.
Has more compatibility info.

See also