Accepted Solutions
To get one selector to act on multiple layers, you've got a few ways to do it.
Adding Actions
It sounds like your selector is set to Grouped Features, maybe? If that's the case, then yes, you can only select one layer. But keep in mind that this is only defining where the selector is getting its list of values.
Go to the actions tab for the selector settings, and you should be able to add a filter action to the other layers. You'll just need to manually define the field mapping.
The key downside to this method is that if a value is not present in the selected layer, it will not be an available choice for filtering your other layers.
Defined Options
If your selector is set to Defined Options, you can have it act on all the layers in the same way.
They key downside to this layer is also its main benefit: the options are all manually defined. You can get your selector to be as specific as possible, but it may be tedious work if you have a lot of values.
Number Selector
If your year attributes are all true numeric data types and not strings, you can also use a number selector. This way you can define a range of values (or leave it open) and the year can simply be incremented, or specified as a range.
For both the number selector and the defined values on the category selector, you'll have to add all three layers on the actions tab.
To get one selector to act on multiple layers, you've got a few ways to do it.
Adding Actions
It sounds like your selector is set to Grouped Features, maybe? If that's the case, then yes, you can only select one layer. But keep in mind that this is only defining where the selector is getting its list of values.
Go to the actions tab for the selector settings, and you should be able to add a filter action to the other layers. You'll just need to manually define the field mapping.
The key downside to this method is that if a value is not present in the selected layer, it will not be an available choice for filtering your other layers.
Defined Options
If your selector is set to Defined Options, you can have it act on all the layers in the same way.
They key downside to this layer is also its main benefit: the options are all manually defined. You can get your selector to be as specific as possible, but it may be tedious work if you have a lot of values.
Number Selector
If your year attributes are all true numeric data types and not strings, you can also use a number selector. This way you can define a range of values (or leave it open) and the year can simply be incremented, or specified as a range.
For both the number selector and the defined values on the category selector, you'll have to add all three layers on the actions tab.
