has_updated: Detect if a UI element has updated

In formods: 'Shiny' Modules for General Tasks

Detect if a UI element has updated

Description

Takes a UI element value and an older value and determines if it has been modified

Usage

has_updated(ui_val = NULL, old_val = NULL, init_val = NULL)

Arguments

ui_val	Current value from the UI.
old_val	Last value of of the element. defined.
init_val	List of values to skip. These are values expected to be assigned on initialization. For buttons it may be 0. For others it may be "".

Value

Boolean result of the comparison

Examples

changed_true  = has_updated(ui_val = "a", old_val = "")
changed_true
changed_false = has_updated(ui_val = "a", old_val = "a")
changed_false

formods documentation built on April 12, 2025, 1:57 a.m.