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rescript-leaflet-react

v5.0.1

Published

Rescript bindings for React Leaflet

Downloads

16

Readme

Rescript Leaflet React · GitHub license · npm version

Rescript bindings for React Leaflet JS

Getting Started

  1. Install the package
npm i rescript-leaflet-react
  1. Add this to you bsconfig.json:
"bs-dependencies": [
    "@rescript/react",
    "rescript-leaflet-react"
]
  1. Import into your Rescript project
open RescriptLeafletReact
  1. Access the LeafletReact module

Example Usage

open RescriptLeafletReact

let s = React.string

module EventLogger = {
  @react.component
  let make = () => {
    open LeafletHooks

    let map = useMap()
    let mapEvents = useMapEvents(EventHandlers.make(
      ~click = (event) => {
        Js.log("Mouse Click:")
        Js.log(event)
      },
      ()
    ))

    let onSingleEvent = useMapEvent("drag", (pos) => {
      Js.log("Drag Event:")
      Js.log(pos)
    })

    Js.log("Center:")
    Js.log(map.getCenter(.))
    <></>
  }
}

@react.component
let make = () => {
  open LeafletReact

  let logMouseEvent = (t) => {
    Js.log(t)
  }

  let logPopupEvent = (t) => {
    Js.log(t)
  }

  let logDragEvent = (t) => {
    Js.log(t)
  }

  let bounds = create_bounds(
    (39.043705, -95.692240), (40.043705, -93.692240)
  )

  let pathOptions = PathOptions.make(
    ~color="#00ff00",
    ()
  )

  <div>
    <MapContainer
      center={(39.043705, -95.692240)}
      style={ReactDOM.Style.make(
        ~height = "100vh",
        ()
      )}
      zoom={3.}
    >
      <TileLayer
        attribution={"&copy; <a href=\"https://www.openstreetmap.org/copyright\">OpenStreetMap</a> contributors"}
        url={"https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"}
      />
      <EventLogger />

      <Marker
        position={(38.043705, -95.692240)}
        eventHandlers={EventHandlers.make(
          ~click = logMouseEvent,
          ~popupopen = logPopupEvent,
          ~drag = logDragEvent,
          ()
        )}
      >
        <Popup>
          {s("You clicked on the marker")}
        </Popup>
      </Marker>

      <Circle
        center={(39.043705, -95.692240)}
        radius={5000.}
        pathOptions={pathOptions}
      />

      <Polyline
        positions={[
          (39.043705, -95.692240),
          (38.043705, -95.692240)
        ]}
      />

      <Polygon
        positions={[
          (40.043705, -93.692240),
          (39.043705, -93.692240),
          (39.043705, -92.692240),
          (40.043705, -93.692240),
        ]}
      />

      <ImageOverlay
        url={"http://3.bp.blogspot.com/-rtiLKRi9zNY/UpdeBJ72Z9I/AAAAAAAAFFQ/qkG2I6fWpv0/s1600/dancing-pickle-like-dancing-banana-large-color-animated.gif"}
        bounds={bounds}
      />
    </MapContainer>
  </div>
}

This snippet of code generates this map: Example Map

Limitations:

This is not a complete binding, if anyone wants to chip away at the library I would happily merge it in.

Because of some weirdness with this binding and rescript's currying system, all the hook functions (getCenter, zoomIn, etc.) must be called in the uncurried way (using func(. param) notation)

Support

Here is a basic list of what is supported right now:

Components

  • MapContainer
  • TileLayer
  • Market
  • Popup
  • Tooltip
  • Circle
  • Polyline
  • Polygon
  • Rectangle
  • Pane
  • ImageOverlay
  • VideoOverlay

Hooks

  • useMap
  • useMapEvents
  • useMapEvent