Add contextmenu Plugin

Add a contextmenu to the map or markers/vector layers.

Usage

addContextmenu(map)

Arguments

map

a map widget object created from leaflet

Value

A leaflet map object

Details

This function is only used to include the required JavaScript and CSS bindings and to set up some Shiny event handlers.

Contextmenu initialization

The contextmenu for

• the map must be defined in leafletOptions.

• the markers/vector layers must be defined in markerOptions or pathOptions.

Contextmenu selection

When a contextmenu is selected, a Shiny input with the ID "MAPID_contextmenu_select" is set (`MAPID` refers to the map's id).

If the selected contextmenu item is triggered from:

• the map, the returned list contains the text of the item.

• the markers, the returned list also contains the layerId, group, lat, lng and label.

• the vector layers, the returned list also contains the layerId, group and label.

References

https://github.com/aratcliffe/Leaflet.contextmenu

See also

Other Contextmenu Functions: addItemContextmenu(), context_mapmenuItems(), context_markermenuItems(), context_menuItem(), disableContextmenu(), enableContextmenu(), hideContextmenu(), insertItemContextmenu(), mapmenuItems(), markermenuItems(), menuItem(), removeItemContextmenu(), removeallItemsContextmenu(), setDisabledContextmenu(), showContextmenu()

Examples

library(leaflet)
leaflet(options = leafletOptions(
  contextmenu = TRUE,
  contextmenuWidth = 200,
  contextmenuItems =
    context_mapmenuItems(
      context_menuItem("Zoom Out", "function(e) {this.zoomOut()}", disabled = FALSE),
      "-",
      context_menuItem("Zoom In", "function(e) {this.zoomIn()}")
    )
)) %>%
  addTiles(group = "base") %>%
  addContextmenu() %>%
  addMarkers(
    data = breweries91, label = ~brewery,
    layerId = ~founded, group = "marker",
    options = markerOptions(
      contextmenu = TRUE,
      contextmenuWidth = 200,
      contextmenuItems =
        context_markermenuItems(
          context_menuItem(
            text = "Show Marker Coords",
            callback = "function(e) {alert(e.latlng);}",
            index = 1
          )
        )
    )
  )