Template ternary operator invalid

Question

The ternary operator written after value does not respond, but replacing {$vo.title} with the ternary operator works. What is the reason?

Answer 1

is selected, your code is wrong

Answer 2

View the corresponding php file generated in the compilation directory

Answer 3

You haven’t made it clear whether it’s an attribute or a value of the tag. If it’s a value or other attribute value, you have to write it clearly.

Answer 4

I can print out both $vo.gid and $data.item.gid, and there is data in them, but they don’t take effect