ShimEvent doesn't have preventDefault method

[xlc]

I am using IndexedDBShim and sklad and got this error on iPad running iOS 8 & 9:

Error: TypeError: evt.preventDefault is not a function. (In 'evt.preventDefault()', 'evt.preventDefault' is undefined)

In this function:

openConnRequest.onerror = function (evt) {
        if (isResolvedOrRejected) {
            return;
        }

        evt.preventDefault();
        reject(ensureError(evt.target.error));

        isResolvedOrRejected = true;
    };

ShimEvent should have preventDefault method and other methods on Event object.

[brettz9]

This also interconnects with #229 and #241

[brettz9]

FYI, I've added support for addEventListener and other EventTarget features via my fork of eventdispatcher.js and although the fork supports preventDefault (as with bubbling), I haven't yet taken advantage of it within IndexedDBShim, so calling it on the code in master will not throw but will currently have no effect. I intend to implement though, so can let you know when it may be ready.

[brettz9]

This is now supported in master. Looking to finish the following though until ready for a release: #262 (comment)

[brettz9]

Actually, I neglected to notice you were asking about preventing within an open request--the versionchange/upgradeneeded (and when ready, blocked and closed) ought to support all of EventTarget, but currently that is not ready or reviewed, so I will reopen, but the normal request->transaction->connection->window.onerror support has been added.

[brettz9]

The AbortError error firing on IDBOpenDBRequest requests (which aborted or were closed) is now done in master. There are some tangential matters which are not complete (e.g., upgradeneeded reversions), but the bubbling work is complete.

Note that your preventDefault should now have no effect (as per point 3.2.1 of this section of the spec).

[brettz9]

FWIW, the ugpradeneeded reversions are applied where possible (esp. in Node where we can prolong a transaction).