Attach htmlwidget binding dependencies to leafletOutput()

R/dependencies.R

@@ -1,3 +1,68 @@
+# N.B. These are all the dependencies required to define leaflet's htmlwidget
+# binding. We've intentionally avoided htmlwidgets' yaml approach to defining
+# these since jQuery (in particular) wants to be defined with R code and must be
+# provided first. For static rendering, it's sufficient to provide these to
+# htmlwidgets::createWidget(dependencies = ...); however, when we dynamically
+# render (via renderLeaflet()) the output container (i.e., leafletOutput()) also
+# needs these dependencies attached (without them, the output binding won't be
+# registered in the time when shiny binds to the DOM). Typically, we don't need
+# to do this since htmlwidgets will automatically attach dependencies defined in
+# yaml to the output container (which we cannot do anymore).
+leafletBindingDependencies <- function() {
+  list(
+    jquerylib::jquery_core(3),
+    htmltools::htmlDependency(
+      name = "leaflet",
+      version = "1.3.1",
+      package = "leaflet",
+      src = "htmlwidgets/lib/leaflet",
+      script = "leaflet.js",
+      stylesheet = "leaflet.css"
+    ),
+    htmltools::htmlDependency(
+      name = "leafletfix",
+      version = "1.0.0",
+      package = "leaflet",
+      src = "htmlwidgets/lib/leafletfix",
+      stylesheet = "leafletfix.css"
+    ),
+    htmltools::htmlDependency(
+      name = "proj4",
+      version = "2.6.2",
+      package = "leaflet",
+      src = "htmlwidgets/plugins/Proj4Leaflet",
+      script = "proj4.min.js",
+      all_files = FALSE
+    ),
+    htmltools::htmlDependency(
+      name = "Proj4Leaflet",
+      version = "1.0.1",
+      package = "leaflet",
+      src = "htmlwidgets/plugins/Proj4Leaflet",
+      script = "proj4leaflet.js",
+      all_files = FALSE
+    ),
+    htmltools::htmlDependency(
+      name = "rstudio_leaflet",
+      version = "1.3.1",
+      package = "leaflet",
+      src = "htmlwidgets/lib/rstudio_leaflet",
+      stylesheet = "rstudio_leaflet.css"
+    ),
+    # Include the rstudio leaflet binding last
+    # https://github.com/ramnathv/htmlwidgets/blob/7b9c1ea3d9fbf4736d84f1fd1178fce0af29f8e3/R/utils.R#L59-L68
+    htmltools::htmlDependency(
+      name = "leaflet-binding",
+      version = get_package_version("leaflet"),
+      src = "htmlwidgets/assets",
+      package = "leaflet",
+      script = "leaflet.js",
+      all_files = FALSE
+    )
+  )
+}
+
+
 #' Various leaflet dependency functions for use in downstream packages
 #' @examples \dontrun{
 #' addBootStrap <- function(map) {

R/leaflet.R

@@ -89,57 +89,7 @@ leaflet <- function(data = NULL, width = NULL, height = NULL,
       widget
     },
     elementId = elementId,
-    dependencies = list(
-      jquerylib::jquery_core(3),
-      htmltools::htmlDependency(
-        name = "leaflet",
-        version = "1.3.1",
-        package = "leaflet",
-        src = "htmlwidgets/lib/leaflet",
-        script = "leaflet.js",
-        stylesheet = "leaflet.css"
-      ),
-      htmltools::htmlDependency(
-        name = "leafletfix",
-        version = "1.0.0",
-        package = "leaflet",
-        src = "htmlwidgets/lib/leafletfix",
-        stylesheet = "leafletfix.css"
-      ),
-      htmltools::htmlDependency(
-        name = "proj4",
-        version = "2.6.2",
-        package = "leaflet",
-        src = "htmlwidgets/plugins/Proj4Leaflet",
-        script = "proj4.min.js",
-        all_files = FALSE
-      ),
-      htmltools::htmlDependency(
-        name = "Proj4Leaflet",
-        version = "1.0.1",
-        package = "leaflet",
-        src = "htmlwidgets/plugins/Proj4Leaflet",
-        script = "proj4leaflet.js",
-        all_files = FALSE
-      ),
-      htmltools::htmlDependency(
-        name = "rstudio_leaflet",
-        version = "1.3.1",
-        package = "leaflet",
-        src = "htmlwidgets/lib/rstudio_leaflet",
-        stylesheet = "rstudio_leaflet.css"
-      ),
-      # Include the rstudio leaflet binding last
-      # https://github.com/ramnathv/htmlwidgets/blob/7b9c1ea3d9fbf4736d84f1fd1178fce0af29f8e3/R/utils.R#L59-L68
-      htmltools::htmlDependency(
-        name = "leaflet-binding",
-        version = get_package_version("leaflet"),
-        src = "htmlwidgets/assets",
-        package = "leaflet",
-        script = "leaflet.js",
-        all_files = FALSE
-      )
-    )
+    dependencies = leafletBindingDependencies()
   )
 
   if (crosstalk::is.SharedData(data)) {

R/shiny.R

@@ -19,7 +19,11 @@
 #'
 #' \donttest{if (interactive()) app}
 leafletOutput <- function(outputId, width = "100%", height = 400) {
-  htmlwidgets::shinyWidgetOutput(outputId, "leaflet", width, height, "leaflet")
+  htmltools::attachDependencies(
+    htmlwidgets::shinyWidgetOutput(outputId, "leaflet", width, height, "leaflet"),
+    leafletBindingDependencies(),
+    append = TRUE
+  )
 }
 
 # use expr description from htmlwidgets to avoid bad inherit params code