Leaflet.BetterFileLayer

Load your spatialized files into Leaflet the way it should be.

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This is a Leaflet plugin for loading your spatialized data into leaflet based on leaflet-omnivore and Leaflet.FileLayer plugins. This plugin was made looking for a convenient and easy to use plugin for loading external spatial files to leaflet.

It currently supports:

• GeoJSON
• JSON (Using the GeoJSON structure)
• CSV (via csv2geojson)
• GPX
• KML
• KMZ
• WKT (via wellknown)
• TopoJSON (via topojson-client)
• Encoded Polylines (via polyline)
• Shapefile (via shpjs) (zipped or separate files)

Installation

npm install leaflet-better-filelayer

Demo

Checkout the Demo

Below gif show an example of loading a separated shapefile using drag and drop.

Note: The plugin only looks for .shp, .dbf, .shx, .prj with the same name.

Usage

As map option:

const map = L.map('map', { betterFileLayerControl: true })

Or like any control

L.Control.betterFileLayer().addTo(map);

Docs

Options:

// The Options object
options = {
  position: 'topleft', // Leaflet control position
  fileSizeLimit: 1024, // File size limit in kb (default: 1024 kb)
  style: () => {}, // Overwrite the default BFL GeoJSON style function
  onEachFeature: () => {}, // Overwrite the default BFL GeoJSON onEachFeature function
  layer: L.customLayer, // If you want a custom layer to be used (must be a GeoJSON class inheritance)
  // Restrict accepted file formats (default: .gpx, .kml, .kmz, .geojson, .json, .csv, .topojson, .wkt, .shp, .shx, .prj, .dbf, .zip)
  formats:['.geojson', '.kml', '.gpx'],
  importOptions: { // Some file types may have import options, for now, just csv is documented
    csv: {
      delimiter: ';',
      latfield: 'LAT',
      lonfield: 'LONG',
    },
  },
  text: { // If you need translate
    title: "Import a layer", // Plugin Button Text
  },
}

Events

Event Name	Data	Description
bfl:layerloaded	{ layer: L.Layer }	Event fired when the data is sucessfuly loaded on map. It returns the layer reference
bfl:layerloaderror	{ layer: string }	Event fired when the loader fails to load your file. It returns the name of the file
bfl:filenotsupported	{ layer: string }	Event fired when the loader does not support the file type of your file. It returns the name of the file
bfl:layerisempty	{ layer: string }	Event fired when the layer haven't any features. It returns the name of the file
bfl:filesizelimit	{ layer: string }	Event fired when the file's size exceeds the file size limit (fileSizeLimit option). It returns the name of the file

Custom html button

If you are developing a web application and you want to use your own html button outside the map container, you can use the following code:

// Note: The button have to be type "file"
// Example: <input type="file" accept=".gpx,.kml,.geojson,.json" multiple />
const options = {
  button: document.getElementById('my-button'), // Your button HTML reference
}

const control = L.Control.betterFileLayer(options)
  .addTo(map);

After that, the plugin will bind an "on change" event on this button, waiting for files.

You can see the example here

Note: The Drag and Drop event listener will bind it self automatically

Development

Install the development dependencies

npm install --save-dev

Start the webpack watch to compile and save at dist/ after any change

npm run dev

Open index.html in your browser and start editing

Test

To run unity tests:

npm run test

Authors

• Gabriel Russo

Credits

• Copyright (c) 2014, Mapbox
• Copyright (c) 2012, Michael Bostock
• Copyright (c) 2012 Makina Corpus

See License for more details