小册子地图上当前鼠标位置的坐标与闪亮 [英] Coordinates of current mouse position on leaflet map with shiny
问题描述
我想要在闪亮的传单地图中访问当前鼠标位置。使用闪亮时,您可以使用输入$ MAPID_click
获取点击事件的当前坐标,其中包含点击的纬度和经度。同样地,我希望输入$ MAPID_mouseover
,其中包含鼠标光标的当前纬度和经度列表。
mapview :: addMouseCoordinates(map)
显示传单地图中的坐标。它使用map.latlng.lng和map.latlng.lat,但我无法弄清楚,如何调整代码以返回带坐标的列表而不是显示它们。
理想情况下,此代码应该有效:
库(闪亮)
库(传单)
ui< - fluidPage(
leafletOutput(map),
br(),
verbatimTextOutput(out)
)
server< - function(input,output,session){
output $ map< - renderLeaflet({
leaflet()%>%addTiles()
})
输出$ out< - renderPrint({
validate(需要(输入$ map_mouseover,FALSE))
str(输入$ map_mouseover)
})
}
shinyApp(ui,server)
使用
I want to access the current mouse position in a leaflet map in shiny. When using shiny you can get the current coordinates of a click event using input$MAPID_click
, which contains latitude and longitude of the click. Similarly I want to have input$MAPID_mouseover
with a list of the current latitude and longitude of the mouse cursor.
mapview::addMouseCoordinates(map)
displays the coordinates in the leaflet map. It uses map.latlng.lng and map.latlng.lat, but I couldn't figure out, how to adapt the code to return a list with the coordinates instead of displaying them.
Ideally this code should work:
library(shiny)
library(leaflet)
ui <- fluidPage(
leafletOutput("map"),
br(),
verbatimTextOutput("out")
)
server <- function(input, output, session) {
output$map <- renderLeaflet({
leaflet() %>% addTiles()
})
output$out <- renderPrint({
validate(need(input$map_mouseover, FALSE))
str(input$map_mouseover)
})
}
shinyApp(ui, server)
Using onRender
from htmlwidgets
, you can add some javascript to pass the coordinates from mousemove
to a Shiny input, based on this article.
library(shiny)
library(leaflet)
library(htmlwidgets)
ui <- fluidPage(
leafletOutput("map"),
br(),
verbatimTextOutput("out")
)
server <- function(input, output, session) {
output$map <- renderLeaflet({
leaflet() %>%
addProviderTiles("OpenStreetMap.Mapnik") %>%
setView(-122.4105513,37.78250256, zoom = 12) %>%
onRender(
"function(el,x){
this.on('mousemove', function(e) {
var lat = e.latlng.lat;
var lng = e.latlng.lng;
var coord = [lat, lng];
Shiny.onInputChange('hover_coordinates', coord)
});
this.on('mouseout', function(e) {
Shiny.onInputChange('hover_coordinates', null)
})
}"
)
})
output$out <- renderText({
if(is.null(input$hover_coordinates)) {
"Mouse outside of map"
} else {
paste0("Lat: ", input$hover_coordinates[1],
"\nLng: ", input$hover_coordinates[2])
}
})
}
shinyApp(ui, server)
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