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How to add markers to a leaflet in R?
I am trying to add some markers to a leaflet map in R based on conditions that I select from an selectInput command. The selectInput command lets the user choose three different numbers (1, 2 or 4).
What happens when leaflet is redrawn in R?
Inside the renderLeaflet expression, you return a Leaflet map object. This works, but reactive inputs and expressions that affect the renderLeaflet expression will cause the entire map to be redrawn from scratch and reset the map position and zoom level. For some situations that may be acceptable or desirable behavior.
How does a leaflet get input from shiny?
Leaflet maps and objects send input values (which we’ll refer to as “events” in this document) to Shiny as the user interacts with them. Object event names generally use this pattern: So for a leafletOutput (“mymap”) had a circle on it, clicking on that circle would update the Shiny input at input$mymap_shape_click.
Do you need icon argument for leaflet markercluster?
The icon argument needs to be the name of any valid icon supported by the the respective library (w/o the prefix of the library name). When there are a large number of markers on a map, you can cluster them using the Leaflet.markercluster plug-in.
How can I use leaflet and shiny together?
For an extensive example of Shiny and Leaflet working together, take a look at the SuperZip Explorer example app (note the “Get Code” button at the top of the page). (Hint: Try clicking on the bubbles, and also notice that the plots in the sidebar change as you pan and zoom around the map.)
How to use a shiny leaflet widget in an app?
Most Shiny output widgets are incorporated into an app by including an output (e.g. plotOutput) for the widget in the UI definition, and using a render function (e.g. renderPlot) in the server function. Leaflet maps are no different; in the UI you call leafletOutput, and on the server side you assign a renderLeaflet call to the output.