Questions tagged [shiny]
Web Application Framework for R
35
questions
1
vote
0answers
18 views
Bounding box in Leaflet
I am currently writing a app in R / Shiny where I use Leaflet. Background layers are WMS and it works fine for most services without specifying any projection anywhere. When using fiddler I see that ...
0
votes
0answers
18 views
How to upload only a shapefile to R shiny and convert it to spatial dataframe?
I have been searched to upload a shapefile in ui.R and to convert the shapefile to spatial dataframe using sf in server.R. But I didn't got any answer. If someone knows let me know.
0
votes
0answers
26 views
Disable scroll wheel zoom event in Leaflet for R
Is there a way to disable scroll wheel zoom events for Leaflet in R, when you do not know what the zoom is in advance?
output$map <- renderLeaflet({
location <- input$location_id
lf_bbox &...
3
votes
1answer
45 views
Shiny leaflet click-event returns NULL when clicked again
When leafletProxy() is used, the click event of leaflet returns NULL when a polygone is clicked for the second time.
How can I prevent it from doing so?
Example code:
library(shiny)
library(...
1
vote
0answers
31 views
No applicable method for 'metaData' applied to an object of class “NULL” with Leaflet map
I'm putting together a Shiny app that involves a Leaflet map. Unfortunately, whenever I run it, it produces this error: "no applicable method for 'metaData' applied to an object of class "NULL"". I'm ...
1
vote
0answers
25 views
Setting up leaflet map in R using if/else if/else filtering
I'm trying to put together a map for work. Right now, the script looks as such (The shape file data can be downloaded here):
library(tigris)
library(mapview)
library(leaflet)
library(sf)
library(...
1
vote
2answers
33 views
getMapData returns NULL in R
I'm trying to use the getMapData function inside an R shiny app, but the function returns NULL whenever I call it.
library(leaflet)
# works
m <- leaflet() %>% addTiles() %>% setView(-80,30,...
1
vote
0answers
33 views
Error while rendering Leaflet map on Shiny
I have been trying to reproduce a Leaflet map on a Shiny webpage. I have made this code so far:
library(shiny)
library(shinydashboard)
library(leaflet)
library(rgdal)
library(dplyr)
library(DT)
Map &...
0
votes
1answer
59 views
R Shiny Openstreetmaps - lock map within a set of upper and lower bounds
I am using Openstreetmaps with R/Shiny. I am trying to restrict map display to a given range of coordinates, i.e.xmin, ymin, xmax, ymax so that the users of the map won't be able to look other parts ...
0
votes
0answers
124 views
Auto zoom when uploading shapefile R / Leaflet
I would like to configure an automatic zoom at the canvas of the shapefile layer that I upload. For that it would be necessary that a function automatically detects the latitude and the longitude of ...
0
votes
1answer
199 views
Using R with Leaflet and Shiny to produce WMS?
I've have been using R with Leaflet and Shiny to produce a web map that is accessible to the public online. It is a real-time air temperature map of Tasmania, Australia based on current Bureau or ...
1
vote
1answer
55 views
Save a shapefile in a temporary file
I would like to add a line after the transformation of my shapefile in order to save it in a temporary file.
uploadShpfile <- reactive({
if (!is.null(input$shp)) {
inFile <- input$...
0
votes
1answer
233 views
Input points shapefile in shiny app
The application I created allows me to import a polygon shapefile into my Leaflet map. However, I would like to set up a point shapefile import on the same button. I tried several attempts, especially ...
0
votes
0answers
192 views
Is there a way to get coordinates from a map using Leaflet on a Shiny app in R by clicking, but without a marker?
In this example I have some polygons and I click on the centroids (variable centroides) to get values from a raster (variable s).
server <- function(input, output, session) {
points <- ...
0
votes
0answers
179 views
Use clickEvents in shiny with tmap
You can use clickEvents for the tmap package in shiny as in this example for leaflet in shiny.
However, I don't know how to acces the click events. On each click an Id is given, but where is this id ...
0
votes
0answers
382 views
How to create a single multi-option Leaflet filter from multiple columns of R data frame in Shiny?
I am creating a Shiny Leaflet app in R where am trying to display locations (markers) that correspond to a multiple dropdown filter. The data I have has many columns, but basically looks something ...
3
votes
0answers
542 views
Selecting and deselecting markers in leaflet under R shiny?
I would like to write a script that selects a marker on the map whenever I click on it and then deselect it when I click/select another marker (that is, so that no more that one marker is selected on ...
1
vote
1answer
1k views
Conditionally adding markers to map in R leaflet and shiny
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). ...
1
vote
0answers
885 views
How to add a text on a Leaflet map
Each day I need to draw a path on a map and add a text (like 4, 5 or 8 min) indicating how long it takes by car from the starting point to the destination (see the figure below).
I thought it would ...
1
vote
0answers
292 views
Shiny leaflet map renders twice on switching input
I'm trying to produce a Shiny app with Leaflet that renders a choropleth map based on different input criteria. The map displays incidents of different types (input$type) and backgrounds (input$...
3
votes
2answers
2k views
Using R Shiny to create a plot with a shapefile and a raster
I just wanted to upload a shapefile and a raster in a RShiny app and then execute a script. What I have wrote is the following;
library(shiny)
library(raster)
library(rgdal)
ui=shinyUI(fluidPage(...
1
vote
0answers
2k views
Dynamic leaflet scale / zoom / bounds in R Shiny Applications
I've dug into a few older stack exchanges on this topic, but am at a standstill.
I am attempting to let leaflet dynamically resize in a large shiny app when the application is resized. I'm doing that ...
3
votes
1answer
495 views
Reusing leaflet map elements in custom functions in Shiny/R
I have an application that reuses several leaflet elements, so I'm trying to build functions to streamline my code.
All of my logical attempts failed, so I utilized an example I was familiar with ...
2
votes
0answers
510 views
R Shiny / leaflet map: Projection problem in creating map in Plate Carree projection
I'm trying to create an R Shiny map using the leaflet package to display input layers in the Plate Carree projection rather than the default Spherical Mercator projection. I've input OSM and WMS tile ...
1
vote
1answer
4k views
Using .shp files in R with leaflet and shiny
I'd like to use the following .shp file to plot area development outlines for KY using leaflet in a shiny app. I use the code below, but I get an error that ".prj file is missing." Also, no outline ...
5
votes
2answers
1k views
Adding a linestring by st_read in Shiny/Leaflet
I have a large shapefile. For a better perfomance I try to load data with st_read() from sf package. The official documentation states that it should be very easy to integrate the shapefile into ...
3
votes
1answer
2k views
Leaflet: tool for multiple marker selection and computation of summary
Let's suppose that we've got a leaflet map with some markers and another layer, a raster image let's say. Is there a tool, or a way to create one, that allows one to select with an area, a subset of ...
7
votes
1answer
671 views
How do I tile raster input to speed up display in R Shiny programs?
Disclaimer: I have very little GIS experience
I've been working on a project in R that involves displaying large raster maps in an R Shiny interface. I am using the leaflet package for display. The ...
2
votes
1answer
4k views
Removing specific Circle Markers in Leaflet Shiny
I have a layer of CircleMarkers and I am trying to remove only the markers that have a certain layerId. The id's for these circle markers are in a dataframe. In reality I have millions of id's whose ...
3
votes
1answer
1k views
LeafletCRS projection issues
I am trying to get a map in the Dutch Rijksdriehoekstelsel coordinates in a Leaflet map in R that is going in a Shiny app later. I am going to have to add polygons later, and changing their X and Y ...
4
votes
1answer
1k views
Why does Leaflet with provider tiles not draw markers as expected?
I'm working with Leaflet maps in Shiny for R. I'm producing a map with some markers on it. When I use addTiles () for my base map, everything works as expected. However with addProviderTiles (), the ...
1
vote
1answer
2k views
Changing the line width/weight in Leafletr addPolylines function depending on an attribute
I would like to display flow lines (OD-lines) using leaflet in Shiny and sofar I can successfully map all the lines I want. But I also want to change the line width so that each line will have a ...
2
votes
2answers
3k views
Disable double click zoom event in Leaflet for R
Is there a way to disable the double click zoom in Leaflet for R?
I've created a Shiny app that changes polygon styles when a country's region is clicked on/off. If you select and immediately ...
1
vote
1answer
661 views
Problems transforming polygon projections inside Shiny app
I've just recently started attempting to build mapping apps with leaflet and shiny in R. I'm currently stumped by an issue with projecting polygons inside shiny.
Here is the shapefile to reproduce ...
4
votes
1answer
6k views
Changing the style of a polygon with a click event in a Shiny/Leaflet app
I'm attempting to create my first Shiny app using Leaflet. I'm currently trying to figure out how observers work together to update the map when something is clicked. Here is the example that I've ...
