callAllExists(callback, existsValue, parameter)
Calls a function, specified by name, on all children in the group who exist (or do not exist). After the existsValue parameter you can add as many parameters as you like, which will all be passed to the child callback.
Parameters
Name Type Argument Description callback string Name of the function on the children to call. existsValue boolean Only children with exists=existsValue will be called. parameter any <repeatable> Additio