>
map.layers[1].styleMap.styles.default.defaultStyle.pointRadius='${Water_Leve}';
...
> I think that the attribute may have been registered as a string
What attribute? To javascript '${Water_Leve}' is a string, pure and simple,
with a $ character, a { character, a W character, etc etc.
> ... =parseFloat('${Water_Leve}');
It's still just a string, so parseFloat of a non-numeric string give result
NaN (Not a Number), just as it should.
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