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    IDBObjectStore.autoIncrement

    This article is in need of a technical review.

    The autoIncrement property of the IDBObjectStore interface returns the value of the auto increment flag for this object store.

    Syntax

    var myAutoIncrement = objectStore.autoIncrement;

    Value

    A Boolean:

    Value Meaning
    true The object store auto increments.
    false The object store does not auto increment.
     

    Example

    In the following code snippet, we open a read/write transaction on our database and add some data to an object store using add(). After the object store has been created, we log objectStore.autoIncrement to the console. For a full working example, see our To-do Notifications app (view example live.)

    // Let us open our database
    var DBOpenRequest = window.indexedDB.open("toDoList", 4);
    
    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 addData() function to add the data to the database
      addData();
    };
    
    function addData() {
      // Create a new object ready to insert into the IDB
      var newItem = [ { taskTitle: "Walk dog", hours: 19, minutes: 30, day: 24, month: "December", year: 2013, notified: "no" } ];
    
      // open a read/write db transaction, ready for adding the data
      var transaction = db.transaction(["toDoList"], "readwrite");
    
      // report on the success of opening the transaction
      transaction.oncomplete = function(event) {
        note.innerHTML += '<li>Transaction completed: database modification finished.</li>';
      };
    
      transaction.onerror = function(event) {
        note.innerHTML += '<li>Transaction not opened due to error. Duplicate items not allowed.</li>';
      };
    
      // create an object store on the transaction
      var objectStore = transaction.objectStore("toDoList");
      console.log(objectStore.autoIncrement);
    
      // add our newItem object to the object store
      var objectStoreRequest = objectStore.add(newItem[0]);
    
      objectStoreRequest.onsuccess = function(event) {
        // report the success of our new item going into the database
        note.innerHTML += '<li>New item added to database.</li>';
      };
    };

    Specification

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

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 23webkit
    24
    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

    Document Tags and Contributors

    Contributors to this page: fscholz, chrisdavidmills
    Last updated by: fscholz,