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    IDBRequest.error

    This article is in need of a technical review.

    The error property of the IDBRequest interface returns the error in the event of an unsuccessful request.

    Syntax

    var myError = request.error;

    Value

    A DOMError containing the relevant error. The following error codes are returned under certain conditions:

    Error Explanation
    AbortError If you abort the transaction, then all requests still in progress receive this error.
    ConstraintError If you insert data that doesn't conform to a constraint. It's an exception type for creating stores and indexes. You get this error, for example, if you try to add a new key that already exists in the record.
    QuotaExceededError If you run out of disk quota and the user declined to grant you more space.
    UnknownError If the operation failed for reasons unrelated to the database itself. A failure due to disk IO errors is such an example.
    NoError If the request succeeds.
    VersionError If you try to open a database with a version lower than the one it already has.

    In addition to the error codes sent to the IDBRequest object, asynchronous operations can also raise exceptions. The list describes problems that could occur when the request is being executed, but you might also encounter other problems when the request is being made. For example, if the the request failed and the result is not available, the InvalidStateError exception is thrown.

    Example

    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. Also included at the bottom is an onerror function that reports what the error was if the request fails. 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 it's 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);
    
      // When this new request succeeds, run the displayData() function again to update the display
      updateTitleRequest.onsuccess = function() {
        displayData();
      };
    };
    
    objectStoreTitleRequest.onerror = function() {
      // If an error occurs with the request, log what it is
      console.log("There has been an error with retrieving your data: " + objectStoreTitleRequest.error);
    };

    Specifications

    Specification Status Comment
    Indexed Database API
    The definition of 'error' 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,