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IDBOpenDBRequest

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.

Note: This feature is available in Web Workers

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.innerHTML += "<li>Error loading database.</li>";
};

DBOpenRequest.onsuccess = (event) => {
  note.innerHTML += "<li>Database initialized.</li>";

  // 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.innerHTML += "<li>Error loading database.</li>";
  };

  // 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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
IDBOpenDBRequest 2423–57 12 1610–16 10 15 8 ≤37–574.4 2525–57 22 14 8 1.51.5–7.0
blocked_event 23 12 10 10 15 8 4.4 25 22 14 8 1.5
upgradeneeded_event 23 12 10 10 15 8 4.4 25 22 14 8 1.5
worker_support 23 12 37 10 15 10 4.4 25 37 14 10 1.5

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/IDBOpenDBRequest