[英]Mapbox case expression
i try to style my mapbox layer using case expression: 我尝试使用case表达式设置我的mapbox图层的样式:
const max_expr = ['max', ['get', 'POLY_COLOUR_CODE_D'], ['get', 'POLY_COLOUR_CODE_BW'], ['get', 'POLY_COLOUR_CODE_A']];
'paint': {
'fill-color': ['case', ['==', max_expr, 1], 'green', ['==', max_expr, 2], 'yellow',
['==', max_expr, 3], 'red', ['==', max_expr, 4], 'red']
}
but i get following weird error: paint.fill-color: Expected an odd number of arguments. 但我得到以下奇怪的错误:paint.fill-color:预期奇数个参数。 Do you have any idea how to fix this?
你知道如何解决这个问题吗?
You are probably just missing a default value in your case
expression: 您可能只是在
case
表达式中缺少默认值:
[
'case',
['==', max_expr, 1],
'green',
['==', max_expr, 2],
'yellow',
['==', max_expr, 3],
'red',
['==', max_expr, 4],
'red',
<default>
];
It's not super obvious, but the documentation shows that a default is not optional: https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-case 这不是很明显,但文档显示默认值不是可选的: https : //www.mapbox.com/mapbox-gl-js/style-spec/#expressions-case
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