ListGrid.fetchData() fires executeFetch multiple times

[alan.hayes]

Hi,

I'm having a strange problem. I have a databound ListGrid, and a button which simply calls:

grid.invalidateCache();
grid.fetchData();

But when the fetchData is executed, the Datasource.executeFetch is fired 3 times. I can't figure it out. This is having the strange effect of duplicate rows being added to the grid.

For example: the executeFetch fires an RPC which always returns 4 rows. However, because it is fired 3 times, in quick succession, I get some duplicates in the grid:

Row 1
Row 2
Row 3
Row 4
Row 1
Row 2
Row 3

I'm at a loss as to why or how this could happen. Has anybody encountered something similar?

[Isomorphic]

You don't need to call fetchData() after invalidateCache(), it's automatic.

As far as those fetches and extra rows appearing, this suggests something is wrong in your startRow/endRow/totalRows values, probably an off-by-one.

[alan.hayes]

Thanks for the tips. I'll check out the start/end row values...

Just one thing though: Does invalidateCache always trigger a fetch? I removed the fetchData() and no fetches are performed now.

I checked the javadocs, they say:

Invalidate the current data cache for this databound component via a call to this.data.invalidateCache(). If necessary, this will cause a new fetch to be performed with the current set of criteria for this component.
Has no effect if this component is not showing a set of filtered data.

So does that mean invalidateCache only triggers a fetch when criteria have been set?

Thanks

[Isomorphic]

InvalidateCache() will re-fetch if fetchData() has ever been called (more generally, if the grid has a ResultSet).