JavaScript is a prototype-based, object-oriented scripting language that is dynamic, weakly typed and has first-class functions.

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138
votes
18answers
59k views

How do various JavaScript mapping libraries compare?

I am working on a web-based mapping system and I'm trying to figure out the best/most appropriate library to use. There are a few of them about and they each have pros and cons. Even after trying a ...
20
votes
5answers
11k views

Visualizing large datasets with Leaflet

When using Leaflet to visualize a large dataset (GeoJSON with 10,000 point features), not surprisingly the browser crashes or hangs. A sub-sample of 1000 features from the same dataset works ...
18
votes
4answers
29k views

How to load external GeoJSON file into Leaflet map

I would like to load a geoJSON (polygon) file into my leaflet map. I have seen examples where geoJSON is embedded into the javascript code but I can't find any examples showing how it is done with an ...
17
votes
6answers
2k views

What embeddable web-based maps exist?

Some of the ones I'm familiar with (in no particular order): Google Maps (http://code.google.com/apis/maps/index.html) Bing Maps (http://www.microsoft.com/maps/developers/) Yahoo Maps (http://...
16
votes
6answers
15k views

How to Create Animated Cluster Markers in OpenLayers/Leaflet?

I want to use Leaflet due to the smooth transitions which Openlayers seems like they can't match. I specifically require the ability to cluster markers with custom styled marker groups. The best ...
16
votes
7answers
10k views

Pure JavaScript Library for Geometry Operations

Does anyone know of a pure JavaScript library for doing geometry operations such as buffer, union, intersects, etc? I want to play with doing these operations in the browser. It looks like ...
16
votes
1answer
584 views

Are there any Javascript map labeling engines available?

Does anyone know of a javascript library containing functions that would allow me to generate labels for points on the map so that the labels don't overlap one another, and have optional leader lines ...
15
votes
2answers
23k views

Adding/Removing Leaflet GeoJSON layers

I'm trying to show different GeoJSON layers at different zoom layers using the Leaflet API. I can load and display all three layers at once (though I don't actually want them all to show at once). I ...
14
votes
6answers
29k views

OpenLayers - redrawing map after container resize

In my web application, I want to enable users to set the size of the map container. Everything worked fine when the container was expanded slightly (apparently this is because the tiles that were ...
14
votes
2answers
6k views

OpenLayers alternatives supporting more client-side features

I am considering different architectures for a system that will ideally use client-side rendering for point features and must be plugin-free. I have been using this application developed in response ...
13
votes
3answers
5k views

Open source alternatives to Google's StreetView engine?

I am looking to create an open source javascript app using either Leaflet or OpenLayers. Is there any way to implement panoramic views (similar to Google's StreetView) into either of these, or any ...
13
votes
4answers
4k views

Which framework is best to implement an application robustly, using ArcGIS Server JS API?

Over on the Esri forum, user Matt Moyles suggested that the approach used in the Esri JS samples isn't suitable for robust development of a web mapping application using HTML, JavaScript and CSS: ...
12
votes
1answer
20k views

How to Add/Remove Legend with Leaflet Layers Control?

I have two overlays http://02d0c8c.netsolhost.com/dev/lcb_census_layers3.html that can be turned on and off with a Layer Control. I’d like the legend for each layer to turn on/off along with the ...
12
votes
4answers
17k views

How to overlay lat/lon points on a Google layer in OpenLayers 2?

I'm stuck adding a vector point in lat/lon on top of a Google layer in OpenLayers. The point is moving when I pan the map. This doesn't happen if I replace the Google layer with a layer in WGS84. How ...
11
votes
3answers
3k views

Where can I find country borders data in human-readable format?

I'm trying to obtain some data representing the borders of all countries in the world. This data doesn't have to be very precise, it is to draw the countries on a computer screen. I did a bit of ...
11
votes
9answers
2k views

What is a good Javascript web API (preferably open) for building web maps that require little/no maintenance?

I have recently volunteered to make a web map for a local non-profit. The map will be pretty basic. It needs to display Lane county, Oregon split into multiple districts, with a "central office" ...
11
votes
4answers
2k views

Options for displaying PostGIS rasters in OpenLayers

This question is similar to an earlier question about displaying vector data in a web-map. I want to have a basic web interface which uses OpenLayers and can display raster data that is currently in ...
11
votes
1answer
1k views

Leaflet rendering TileMill tiles in the wrong order

I'm stumped, and quite a lot of searching has turned up nothing helpful. I'm on the first step of what will ultimately be a map with three raster layers and three layers of markers (with controls to ...
11
votes
2answers
6k views

OpenLayers 2.12 and http basic authentication woes

I am trying to use OpenLayers 2.12 to display WMS layers from a server which has HTTP Basic Authentication enabled. I have tried to handle the authentication by putting the username and password in ...
10
votes
3answers
330 views

What's a good library for displaying many small maps on a web page

I would like to create a visualization on the web similar to the following: http://namemapper.babynamewizard.com/namemapper/ Are there any good libraries for doing this? Is OpenLayers light-weight ...
10
votes
3answers
7k views

Z-index in OpenLayers 3: layer ordering in OL3

Is there a method to change Z-indexes of layers in OpenLayers3 like it was in old version? map.setLayerIndex(markers, 99); //set the marker layer to an arbitrarily high layer index I need to change ...
10
votes
2answers
4k views

Leaflet mouse wheel zoom only after click on map

I'm working with the Leaflet JavaScript Library and attached a (working) map to my HTML Document. It is in the middle of the page, and when I'm scrolling down with my mouse wheel and arrive at the map,...
10
votes
3answers
4k views

Editing PostGIS/GeoServer data via web?

I've got PostGIS installed and would like to create a web application to do some simple edits: Draw manually (over a Basemap) points, lines and polylines, using snapping points (points, end of ...
10
votes
3answers
2k views

Restrict pan and zoom in ArcGIS Javascript API? [duplicate]

I'm creating a web map of a university campus. I have the map functioning, but I don't want to be able to pan off of the basemap, into whitespace. Do you know of a function that will auto-pan the ...
10
votes
5answers
4k views

CORS issue ArcGIS 10.1 IIS (Cross Origin Resource Sharing)

I have ArcGIS 10.1 installed with the web adapter for IIS. I've added a config file to the root of IIS7 to enable Cross Origin Resource Sharing (CORS) as per this page. I've pushed the cors enabled ...
10
votes
5answers
2k views

what is the right way to delete all features from featureLayer

I have a featureLayer and I don't want to kill it and create another one. I want to delete all features from the current featureLayer. I found that I can use applyEdits method but in order to use it I ...
10
votes
3answers
3k views

Chart inside pop up window in Javascript

How to show a chart inside pop up window? I'm using Leaflet JS, which has support for raphael plugin http://dynmeth.github.com/RaphaelLayer/. Is it possible to create a div inside popup window? I was ...
9
votes
4answers
13k views

How to display mouse position as tooltip in OpenLayers?

I want map coordinates as mouse over effect in OpenLayers. I am using the following code, however it is showing pixel coordinates: map.events.register("mousemove", map, function(e) { ...
9
votes
4answers
6k views

Layer loadstart & loadend events in OpenLayers 3

OpenLayers 2 has these layer events "loadstart & loadend." What is equivalent to them in OpenLayers 3? While a vector layer loads and is rendered, I need to show a loading icon.
9
votes
2answers
6k views

How to cluster Google Maps kml overlay

I have several thousand markers stored in a kmz file that I load into a Google Maps (v3 API). I've looked around to find a way to cluster the overlay data, but to no avail. MarkerClusterer looks nice,...
9
votes
2answers
3k views

How to add a layer to SelectFeature without losing existing selections?

I'm using an OpenLayers.Control.SelectFeature for selections on multiple layers. However, when I add a layer using setLayer(), my selections on the other layers are lost. Anyone know how to work ...
9
votes
2answers
5k views

How to navigate the REST endpoints and retrieve Field information programatically

I'm adding a Dynamic Map Service to an ArcGIS Server JavaScript API map, and I need to get hold of each component layer and its fields, so I can run a query. See the sample ArcGIS Server services ...
9
votes
1answer
3k views

Possible ways to display maps offline, inside mobile hybrid app

I want to develop a mobile hybrid application to run on both Android & iPhone devices in which i want to display my own map data. I have the SHP files with the data i need. I have Geoserver and ...
9
votes
1answer
245 views

Mercator bias plot in Leaflet

I was inspired by this wikipedia image from the mercator projections page to hack around with leaflet. The idea was to interactively have your cursor move a continent and that it would be corrected ...
9
votes
2answers
356 views

Instructor led Web mapping development courses? [closed]

I have been messing around with programing for a while now and have gotten proficient with Python and have some interest in HTML 5 and Javascript. I have recently received a request for an IRD (...
8
votes
2answers
3k views

How to resize a point on zoom out?

I've added a point on map like this but it is static in size. How to resize that point on zooming? Map on zoom out Any guidance and help is appreciated.
8
votes
2answers
9k views

Trigger a click event on a leaflet map?

Is it possible to make a click event occur at a particular lat/lon on a leaflet map? I would like to make a popup appear that is associated with a point at a particular location. I have tried several ...
8
votes
1answer
4k views

Zoom further in with leaflet javascirpt API

We're using the leaflet JavaScript API with a tile layer which supports zoom level up to 19. I'd like users to be able to zoom further even if the tiles blur as they have to place markers to a high ...
8
votes
6answers
11k views

3D perspective on maps in Leaflet, CartoDB?

Are there any JS library out there that would render normal, flat maps (like Leaflet) into a perspective map like this one, on the web: Also, anyone seen anything that could turn CartoDB data into ...
8
votes
1answer
3k views

Building a custom, dynamic legend using ArcGis-server js and dynamicMapServiceLayer

I have a dynamicMapServiceLayer that I am using to build a map application. There are about 10 layers in the mapservice that I am toggling using the setVisibleLayers action. I would like to build my ...
8
votes
1answer
5k views

How to style features created by DrawFeature control?

I've been following this tutorial: http://workshop.pgrouting.org/chapters/geoext_client.html#select-the-start-and-final-destination It contains an Openlayers.Control.DrawFeatures control defined in ...
8
votes
1answer
2k views

Adding custom basemap in ArcGIS.Com that can be used in Javascript API?

It's possible to add a layer as a basemap in ArcGIS.com by checking the check box use as baselayer: But when I consume the map using: var mapDeferred = esri.arcgis.utils.createMap("<guid>", "...
8
votes
3answers
1k views

Embedding dynamic maps into PDF files?

Working in consulting, I found that sending clients PDF file with my embedded maps is one of the best ways to achieve a wow-effect from them. The latest pdf file formats all support the layers ...
8
votes
1answer
10k views

problem adding pop-up to GeoJSON layer in Leaflet

I'm new to working with the Leaflet API and am running into trouble with creating popups for a GeoJSON layer. I've looked at the following post as a reference and am still having difficulty: binding ...
8
votes
3answers
2k views

Moveable ArcGIS Identify Popup Window (Dojo)

I'm trying to get a popup window that identifies a location to be moveable. My code is similar to the API example: var popupOptions = { fillSymbol: new esri.symbol.SimpleFillSymbol(esri.symbol....
7
votes
2answers
14k views

OpenLayers: Use scales instead of resolutions

Venturing around in the OpenLayers source code, it seems like everything related to zoom-levels is done using resolutions. Fair enough since this related directly to screen space. I would like ...
7
votes
4answers
2k views

tiny JS discretization library for choropleth representation

I would like to know if a tiny stat/discretization js library ready to use exists. I do know about the existence of jStat (which I may explore a little bit more thoroughly), and I know that mapfish ...
7
votes
4answers
11k views

How to get JSON from Geoserver using AJAX request

I am building a web mapping application using Leaflet and a sort of customized WFS-T API to place and retrieve features from PostGIS. I have the script for putting features in PostGIS tables down ...
7
votes
3answers
1k views

Help needed using REGEXP for address string parsing

Using JavaScript, my aim is to create an "intelligent" address search function with a single textbox (rather than separate textboxes for house number, street name, street type, suburb, etc). I'm ...
7
votes
3answers
13k views

Accessing GPS data with JavaScript in real time

Is it possible to access GPS data in real time on a smartphone with JavaScript (without an android or ios application I mean)? Thanks