[Qgis-user] Data Defined operation

[Nyall Dawson]

On 8 February 2017 at 14:08, Springfield Harrison <stellargps at gmail.com> wrote:
> Hello,
>
>     Attempting to use the Data Defined function (tool?).
>
>     The following configuration has no effect; it may be looking for a
> colour input.  This DD is to set the background colour on a label where Type
> = SL.
>
>     If I use this function on bold Text, it works but that requires no
> input, it just toggles.
>
>     Where am I supposed to enter the "Expected Input" colour specifications?

The expression needs to evaluate to a color string, whereas your
expression evaluates to a boolean value.

Something like this is acceptable:

case when "Type" = 'SL' then '#ff0000' else '#00ff00' end

Nyall



>
> Data defined override
> Active: yes  (ctrl|right-click toggles)
> Expected input:
> string [r,g,b,a] as int 0-255
> Valid input types:
> string
> Current definition (expression):
> "Type" = 'SL'
>
> Thanks very much . . . .
>
> Cheers . . . . . Springfield Harrison
>
>
>
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