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

    Inherits from: IDBRequest


    No methods.


    Event handlers

    The event handler for the blocked event. This event is triggered when the upgradeneeded event should be triggered because of a version change but the database is still in use (i.e. not closed) somewhere, even after the versionchange event was sent.
    The event handler for the upgradeneeded event, fired when a database of a bigger version number than the existing stored database is loaded.


    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.)

    var db;
    // Let us open our database
    var DBOpenRequest ="toDoList", 4);
    // these two event handlers act on the database being opened successfully, or not
    DBOpenRequest.onerror = function(event) {
      note.innerHTML += '<li>Error loading database.</li>';
    DBOpenRequest.onsuccess = function(event) {
      note.innerHTML += '<li>Database initialised.</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
    // 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
    // line above
    //it is only implemented in recent browsers
    DBOpenRequest.onupgradeneeded = function(event) {
      var db =;
      db.onerror = function(event) {
        note.innerHTML += '<li>Error loading database.</li>';
      // Create an objectStore for this database   
      var 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 });


    Specification Status Comment
    Indexed Database API
    The definition of 'IDBOpenDBRequest' in that specification.
    Candidate Recommendation  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 23webkit
    10 moz
    16.0 (16.0)
    10, partial 15 7.1
    Feature Android Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support 4.4 22.0 (22.0) 1.0.1 10 22 Not supported

    See also


    Contributors to this page: fscholz, julienw, teoli, chrisdavidmills, scottrowe, pdm, mattandrews
    最終更新者: fscholz,