leaflet | 易学教程

leaflet marker not displaying in certain contexts

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问题 I am using the leaflet htmlwidget implementation to draw a web-based map using R. I was looking for a specific marker, couldn't find it, and realized it wasn't being displayed at all. However, when I subset down my dataset to just that entry, the marker displays beautifully. Here is a screenshot of the marker, with code having been run after subsetting the data to just this marker (using the simple line of R script thecounted <- thecounted[thecounted$age==6,] ): Here is the same location when

Leaflet eachLayer function does not iterate through all Layers

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问题 Created some markers using an array of GeoJSON data: $.getJSON("GetLocationsServlet", function(data) { L.geoJSON(data, { onEachFeature: onEachFeature }).addTo(mymap); }); The GeoJSON data is like this: [ { "type": "Feature", "properties": { "name": "Riverway Sport Complex", "amenity": "GYM", "popupContent": "Riverway Sport Complex" }, "geometry": { "type": "Point", "coordinates": [-123.002846, 49.205036] },"id" : "1"} , { "type": "Feature", "properties": { "name": "Imperial@Patterson",

LeaFlet加载矢量切片

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已经谢过了Openlayer的矢量切片，在这里写一篇关于LeaFlet加载矢量切片的文章，关于矢量切片的概念可以参考我写OpenLayer加载矢量切片的那篇文章传送文章一、效果图二、需要用到的插件 leaflet 需要使用插件 L.vectorGrid.protobuf 这只是插件的一个类用来加载pbf,L.VectorGrid.Slicer用来加载geojson和topojson， api文档三、全部代码 <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>LeaFlet加载矢量切片</title> <link href="../script/leaflet/leaflet.css" rel="stylesheet" /> <script src="../script/leaflet/leaflet.js"></script> <script src="https://unpkg.com/leaflet.vectorgrid@latest/dist/Leaflet.VectorGrid.bundled.js"></script> <script src="https://unpkg.com/leaflet.vectorgrid@latest/dist/Leaflet.VectorGrid.js"><

Leaflet Custom Control position: center

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问题 we are hooking up an eye-tracker to control the leaflet map (pan, zoom etc.) We would like to have a custom control that appears at the center of the map (for menu functions) Currently Leaflet does not support position: 'center') (topleft, etc. is supported) ideas? 回答1: Adding a custom control on a map on leaflet is performed like that . For instance for a logo : var logo= L.control({ position : 'topleft' }); logo.onAdd = function(map) { this._div = L.DomUtil.create('div', 'myControl'); var

Overlaying a text box on a leaflet.js map

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问题 This might seem a very simple question, but I've searched elsewhere for the answer with no luck! How do I overlay a simple text box on to a Leaflet map that loads when the map loads (not fixed to any point on a map) - for example, to give a title and more information within the actual map object. Nothing fancy. 回答1: You have two simple options, extend a new L.Control and place it in one of the four corners of the map window with content created inside the onAdd method, or place a L.DivIcon

Leaflet map with WMS and custom projection

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问题 I have implemented a map using Leaflet and tiles from a WMS-service. They offer a list of projections, where of one is usable in standard Leaflet EPSG:4326. However, the map looks a bit distorted, and I recon one of the other projections would be better. The supplier of the maps uses EPSG:32624, but I cannot seem to get that projection right. This is the complete list: EPSG:32624, EPSG:32619, EPSG:32620, EPSG:32621, EPSG:32622, EPSG:32623, EPSG:32624, EPSG:32625, EPSG:32626, EPSG:32627, EPSG

Leaflet geofence on multiple circles … detecting marker inside / outside

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问题 I have some code that detects when the market is dragged inside and outside of a circle. This works great but I was just wondering how I can have one market and multiple circles detected instead of just one. Here is the current code: var mymap = L.map('mapid', { center: [50.895763, -1.150556], zoom: 16 }); L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1Ijoic3RldmVuc2F0Y2giLCJhIjoiY2p5eDR6MWgzMHRvbjNocnJkN2d2MjRwaSJ9.wd0OtBUQQfUtNxdduQA3lg', { maxZoom: 18

How to use Leaflet flyTo() with unproject() and GeoJSON data on a large raster image?

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问题 I'm building a story map with Leaflet using a large image sliced into tiles rather than 'real world' map data. I'm using this plugin: https://commenthol.github.io/leaflet-rastercoords/ and this repo: https://github.com/jackdougherty/leaflet-storymap Loading my GeoJSON data and unprojecting the coordinates correctly plots them on my image map: $.getJSON('map.geojson', function(data) { var geojson = L.geoJson(data, { // correctly map the geojson coordinates on the image coordsToLatLng: function

How to make markers in Leaflet blinking

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问题 Is there a simple way to make a marker in Leaflet map blinking ? I mean animated blinking - something like a loop of transition from opacity 1.0 to opacity 0.5 in 1 second and then reverse, end of loop. 回答1: When you add a Marker you are able to specify an Icon - the options for which include a className. You can use this className option to animate the marker's icon via CSS. var map = L.map('map').setView([51.505, -0.09], 13); L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',

How to make markers in Leaflet blinking

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