Setting different font color types from the same field in rule-based labeling in QGIS

Question

Trying to set different font color types from the same field in rule-based labeling in QGIS.

I have a "C°" field with only 2 values: +56.7 C° and -89.2 C°.

Trying this expression to have it:

CASE
    WHEN "C°" = '56.7 C°' THEN '#ff0101'
    ELSE
        CASE
            WHEN "C°" = '89.2 C°' THEN '#0dff01'
        END
END

But as a return is all font the same:

.

Am I wondering if there is any solution to get different font colors for each value ?

Answer 1

It seems unusual to have a case when then in the filter expression of the rule, so I am guessing you have put the expression to get the color there.

You can replace the filter to be an ELSE by checking the corresponding radio-box (as in the screenshot below), or to replace it with a filter such as "C°" IS NOT NULL.

Then, click the little epsilon sign beside the color and select expression / edit and enter it there.

Note that it could be simplified to

CASE 
WHEN  "C°"  =  '56.7 C°'   
 THEN '#ff0101'
WHEN  "C°"  =  '89.2 C°'   
 THEN '#0dff01' 
END

or even to a single if else statement.

Answer 2

Since you have just two values (+56.7 C° and -89.2 C°), I would use the if() condition instead of the CASE statement.

if("C°" = '56.7 C°','#ff0101','#0dff01')