How to display(expression) specific multiline labels (8 labels only) with same field in QGIS?

Question

I wanted to display the labels (which only 8 labels with the longer names)from one field. I've tried in multiple ways but wasn't works (NOT duplicated question)

I've tried this: if ("NAMEASCII"='Nikolajewsk na Armur', 'Nikolajewsk-\nna-Armur',NAMEASCII)

[I've tried CASE statement, in my case works better only with IF statement]

The result of this expression (green: is the result, red: I need to do the same for this as well):

Layer properties > Label > Rule:

Label with:

BUT this is only one of them, there have 8 labels that I need to create the expression together (i don't know how to combine these 8 names only with one expression) just after the expression(above) Can anyone tell me how? I may need a correct expression... because qgis giving me a syntax error, obviously, the expression that I created is wrong.

Answer 1

Your initial attempt is invalid because you have no quotes around the 2nd `NAMEASCII". So it should be:

if( "NAMEASCII"='Nikolajewsk na Armur', 'Nikolajewsk-\nna-Armur',"NAMEASCII") 

But a better solution might be something like:

if(  length( "NAMEASCII")>10,  wordwrap( "NAMEASCII", 10, '-'),"NAMEASCII") 

where the wordwrap function

Returns a string wrapped to a maximum/minimum number of characters.

Syntax wordwrap(string, wrap_length, delimiter_string)

Arguments

string the string to be wrapped

wrap_length an integer. If wrap_length is positive the number represents the ideal maximum number of characters to wrap; if negative, the number represents the minimum number of characters to wrap.

delimiter_string the delimiter string to wrap to a new line (optional).

Answer 2

I can see you are working with rules (Regel). You can choose Formatting and choose wrap on character: '-'

Then add the '-' in your data for these 8 labels.

Answer 3

Instead of using an if expression, you can use a case

CASE 
   WHEN "NAMEASCII"='Nikolajewsk na Armur' THEN 'Nikolajewsk-\nna-Armur'
   WHEN "NAMEASCII"='other name to modify' THEN 'A-B-C' 
   ELSE "NAMEASCII"
END

Alternatively, you can go to the text tab of the label, and check Apply label text substitutes at the bottom and click the ... to the right. There, you can define the text to be changed.