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Sort layers in Leaflet https://stackoverflow.com/questions/51194461/sort-order-of-layers-in-leaflet-layer-control
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Layers Control Tutorial - Leaflet</title> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <link rel="shortcut icon" type="image/x-icon" href="docs/images/favicon.ico" /> | |
| <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ==" crossorigin=""/> | |
| <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js" integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw==" crossorigin=""></script> | |
| <style> | |
| html, body { | |
| height: 100%; | |
| margin: 0; | |
| } | |
| #map { | |
| width: 600px; | |
| height: 400px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id='map'></div> | |
| <script> | |
| // 4 in first group | |
| var cities = L.layerGroup(undefined, {optionTosort: 9}); | |
| L.marker([39.61, -105.02]).bindPopup('This is Littleton, CO.').addTo(cities), | |
| L.marker([39.74, -104.99]).bindPopup('This is Denver, CO.').addTo(cities), | |
| L.marker([39.73, -104.8]).bindPopup('This is Aurora, CO.').addTo(cities), | |
| L.marker([39.77, -105.23]).bindPopup('This is Golden, CO.').addTo(cities); | |
| // 1 in second group | |
| var otherlayer1 = L.layerGroup(undefined, {optionTosort: 3}); | |
| L.marker([39.7253, -104.96]).bindPopup('This is somewhere').addTo(otherlayer1); | |
| // 1 in third group | |
| var otherlayer2 = L.layerGroup(undefined, {optionTosort: 4}); | |
| L.marker([39.763, -104.86]).bindPopup('This is somewhere else').addTo(otherlayer2); | |
| // add the OpenStreetMap tiles | |
| var grayscale = L.tileLayer('http://{s}.tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png', { | |
| maxZoom: 18, | |
| attribution: '© <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>' | |
| }); | |
| var streets = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { | |
| maxZoom: 19, | |
| attribution: '© <a href="https://openstreetmap.org/copyright">OpenStreetMap contributors</a>' | |
| }); | |
| var map = L.map('map', { | |
| center: [39.73, -104.99], | |
| zoom: 10, | |
| layers: [grayscale, cities, otherlayer1, otherlayer2] | |
| }); | |
| var baseLayers = { | |
| "Grayscale": grayscale, | |
| "Streets": streets | |
| }; | |
| var overlays = { | |
| "Cities": cities, | |
| "otherlayer1": otherlayer1, | |
| "otherlayer2": otherlayer2 | |
| }; | |
| // Config borrowed mainly from https://github.com/Leaflet/Leaflet/blob/922593addb7ba4a7f5f8a2793d53e03cd04c0b9c/spec/suites/control/Control.LayersSpec.js#L342 | |
| L.control.layers(baseLayers, overlays, { | |
| sortLayers: true, | |
| sortFunction: function (a, b) { | |
| return a.options.optionTosort - b.options.optionTosort; | |
| } | |
| }).addTo(map); | |
| </script> | |
| </body> | |
| </html> |
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