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    The source property of the IDBRequest interface returns the source of the request, such as an Index or an object store. If no source exists (such as when calling, it returns null.


    var mySource = request.source;


    An object representing the source of the request, such as an IDBIndex, IDBObjectStore or IDBCursor.


    The following example requests a given record title, onsuccess gets the associated record from the IDBObjectStore (made available as objectStoreTitleRequest.result), updates one property of the record, and then puts the updated record back into the object store in another request. The source of the 2nd request is logged to the developer console. For a full working example, see our To-do Notifications app (view example live.)

    var title = "Walk dog";
    // Open up a transaction as usual
    var objectStore = db.transaction(['toDoList'], "readwrite").objectStore('toDoList');
    // Get the to-do list object that has this title as its title
    var objectStoreTitleRequest = objectStore.get(title);
    objectStoreTitleRequest.onsuccess = function() {
      // Grab the data object returned as the result
      var data = objectStoreTitleRequest.result;
      // Update the notified value in the object to "yes"
      data.notified = "yes";
      // Create another request that inserts the item back into the database
      var updateTitleRequest = objectStore.put(data);
      // Log the source of this request
      console.log("The source of this request is " + updateTitlerequest.source);
      // When this new request succeeds, run the displayData() function again to update the display 
      updateTitleRequest.onsuccess = function() { displayData(); }; 


    Specification Status Comment
    Indexed Database API
    The definition of 'source' 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

    Document Tags and Contributors

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