Created
April 16, 2015 16:07
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Reactive context for leaflet() in dynamic Rmarkdown document (runtime:shiny)
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--- | |
title: "Reactive Leaflet" | |
author: "David Holstius" | |
date: "April 16, 2015" | |
output: html_document | |
runtime: shiny | |
--- | |
## Problem Description | |
**How should one provide a reactive context to `leaflet()`?** | |
This naïve attempt fails with: | |
> Quitting from lines 14-37 (Untitled.Rmd) | |
Error in .getReactiveEnvironment()$currentContext() : | |
Operation not allowed without an active reactive context. (You tried to do something that can only be done from inside a reactive expression or observer.) | |
... if the line beginning with `subset` is uncommented. | |
```{r, echo=FALSE} | |
set.seed(123) | |
rand_lng = function(n = 10) rnorm(n, -93.65, .01) | |
rand_lat = function(n = 10) rnorm(n, 42.0285, .01) | |
rand_z = function(n = 10) rnorm(n, mean = 0, sd = 1) | |
library(sp) | |
my_spdf <- SpatialPointsDataFrame( | |
coords = cbind(rand_lng(50), rand_lat(50)), | |
data = data.frame(z = rand_z(50))) | |
library(shiny) | |
selectizeInput( | |
inputId = "threshold", | |
label = "Threshold", | |
choices = c("Zero" = 0.0, "One" = 1.0), | |
selected = 0.0) | |
library(leaflet) | |
my_spdf %>% | |
# subset(z > input$threshold) %>% | |
leaflet() %>% | |
addTiles() %>% | |
addCircles() | |
``` |
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So, basically do