track-utils {iSEE} | R Documentation

## Track internal events

### Description

Utility functions to track internal events for a panel by monitoring the status of reactive variables in `rObjects`.

### Usage

    .trackUpdate(panel_name, rObjects)

    .trackSingleSelection(panel_name, rObjects)

    .trackMultiSelection(panel_name, rObjects)

    .trackRelinkedSelection(panel_name, rObjects)

### Arguments

`panel_name` | String containing the panel name.
`rObjects` | A reactive list of values generated in the `iSEE` app.

### Details

`.trackUpdate` will track whether an update has been requested to the current panel via `.requestUpdate`.

`.trackSingleSelection` will track whether the single selection in the current panel has changed. Note that this will not cause a reaction if the change involves cancelling a single selection.

`.trackMultiSelection` will track whether the multiple selections in the current panel have changed. This will respond for both active and saved selections.

`.trackRelinkedSelection` will track whether the single or multiple selection sources have changed.

These functions should be called within observer or rendering expressions to trigger their evaluation upon panel updates. It is only safe to call these functions within expressions for the same panel, e.g., to synchronize multiple output elements. Calling them with another `panel_name` would be unusual, not least because communication between panels is managed by the `iSEE` framework and is outside of the scope of the per-panel observers.

### Value

All functions will cause the current reactive context to respond to the designated event. `NULL` is returned invisibly.

### Author(s)

Aaron Lun

[Package iSEE version 2.4.0 Index]