如何在表达式中使用属性？

Question

I have a property in my GeoJSON file that is called "bla". 我的GeoJSON文件中有一个称为“ bla”的属性。

"text-field": [
'case',
['!=', ['get', 'bla'], null],
  "{bla}%",
['==', ['get', 'bla'], null],
  " ",
  " ",
],

I would like to display that property within a case expression, which is not working. 我想在案例表达式中显示该属性，但无法正常工作。

If I simply pass: 如果我简单地通过：

"text-field": "{bla}%"

it is working just fine. 它工作正常。

How do I use properties within that case expression? 如何在该case表达式中使用属性？

Thanks 谢谢

Answer 1

Use concat instead placeholder: 使用concat代替占位符：

"text-field": [
  "case", ['!=', ['get', 'bla'], null],
    ["concat", ['get', 'bla'], '%'],
  ['==', ['get', 'bla'], null],
    " ",
  " "
]