Trying to figure out multiple calls to DataArrived

[mathias]

Hi, i'm experimenting with a new search feature in a grid.

For reasons, we only show records in a grid that matches a certain criteria, say "banana" should be true.

we then have a button that triggers the criteria between true and false, and reload records from the server matching this criteria.

This is how we do it:

public void handleFlipButton() {
    //sets banana = true or false
    grid.setCriteria(getCriteriaForCurrent());

    grid.invalidateCache();
}

I have then added a onDataArrivedHandler to the grid:

@Override
public void onDataArrived(DataArrivedEvent dataArrivedEvent) {
    GWT.log("onDataArrived, start:" + dataArrivedEvent.getStartRow() + ", end: " + dataArrivedEvent.getEndRow());
}

The issue we have is that the *first* time we flip the criteria and invalidate the cache, i get two calls, one with 0, 0 and then the one with the correct amounts of row from the server.

Example of log output when we click the button a few times:

first call to handleFlipButton:
onDataArrived, start:0, end: 0
onDataArrived, start:0, end: 10

second, third, fourth
onDataArrived, start:0, end: 17
onDataArrived, start:0, end: 10
onDataArrived, start:0, end: 17

The server is only called once each time, also the first.

What is that first onDataArrived call? I would like it to not happen. It does not represent any data that has arrived :)

[Blama]

Hi,

Not sure about the different log entries, but in general you should not need the call to invalidateCache(), as the criteria change should be enough to trigger a fetch.

Best regards
Blama