[Qgis-user] Rule based styling issue

[James Keener]

Is it possible that when you leave the expression editor and recompute
the styling the colors accidentally get reversed (e.g. the one for 0 is
now 1)?  I've had this happen to me a few times.

Would it be possible to take a couple screen shots of the workflow so
that we can see exactly what you mean?

Jim

On 10/01/2015 11:50 AM, David Addy wrote:
> I have a query about the use of Rule based styles.
> I have a layer of parishes within a county area, which is  styled with a
> transparent fill. Below it I have a copy layer of the same data.
> In both layers the attribute table has a column headed WAPENTAKE, which
> holds string data of 25 characters wide. Some of the fields contain a
> wapentake name, and the remainder contain NULL.
> I want the copy layer to display a certain style when the wapentake contains
> a name, but nothing when the column wapentake contains NULL.
> 
> Now comes the problem. If I set the copy layer to a rule based style so that
> it will display a coloured shading where there is data in the field
> WAPENTAKE, I expect to use the filter of "WAPENTAKE" IS NOT NULL.
> This works correctly if I double click on the filter section in the Style
> window, and manually edit the filter to this expression.
> If instead I open the ellepsis button (...) in order to use the Expression
> builder to build the same expression, the result is the reverse of what I
> want.  IE those with NULL content now show the selected style, and those
> that have names in the column show no style.
> Can anybody shed light on this issue please? What I am I doing wrong?
> 
> (I am using QGIS 2.8.3 under Windows 7 Professional, 64 bit)
> 
> 
> 
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