param.reactive.reactive_ops.updating

reactive_ops.updating() → rx

Return a new expression that indicates whether the current expression is updating.

This method creates a reactive expression that evaluates to True while the current expression is in the process of updating and False otherwise. This can be useful for tracking or reacting to the update state of an expression, such as displaying loading indicators or triggering conditional logic.

Returns:

A reactive expression that is True while the current expression is updating and False otherwise.

Return type:

ReactiveExpression

Examples

Create a reactive expression and track its update state:

>>> import param
>>> rx_value = param.rx(1)

Create an updating tracker:

>>> updating = rx_value.rx.updating()
>>> updating.rx.value
False

Simulate an update and observe the change in the updating tracker:

>>> rx_value.rx.value = 2
>>> updating.rx.value  # Becomes True during the update process, then False.
False