This example shows how we can design a chart using Vega-Lite, then use Shiny to run that chart using different datasets. Also, it shows how we can update the data to a chart and delay re-running that chart until we tell it to re-run.
In the server function, we use vw_shiny_set_data()
to observe the reactive expression rct_data()
, updating the dataset, then re-running the Vega-Lite chart, whenever rct_data()
changes.
To do this, we had to name the dataset in the Vega-Lite specification; you will see in the definition of spec_bar
that there is a dataset named "source"
. We use this as the name
argument for vw_shiny_set_data()
.
To delay re-running the chart when the data is updated, we call vw_shiny_set_data()
with run = FALSE
. This leaves us with the need for a mechanism to run the chart.
We do this using the function vw_shiny_run()
, which observes the reactive expression linked to the shiny::actionButton()
we create.
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