A reactive read of the task status, for spinners and disabled buttons.
Reading the status of a reactiveAsync() that has not run yet starts it,
just as reading its value would, so a UI that waits for "success" before
reading the value does not wait forever. A reactiveAsync() that is waiting
for an upstream async reactive reports "running" while that upstream runs.
Arguments
- r
An object created by
reactiveAsync(),observeAsync()orreactiveValAsync().
Value
One of "initial", "running", "success", "error" or "idle".
The first four are the statuses of a shiny::ExtendedTask: "initial"
until the first task is sent to a worker, never again afterwards.
"idle" is a task that has been sent but has no value: it was cancelled
with cancel_async(), or it halted on the worker in a req() before any
result.