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 ...
16
votes
4answers
27k 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 ...
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 ...
5
votes
2answers
20k views

Calculate bearing between two decimal GPS coordinates

I'm building a virtual tour application that uses custom panoramas in conjunction with Google's StreetView service. With StreetView, you can have 1 to n links at each particular location to move to, ...
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 ...
4
votes
1answer
2k views

Sketch event in Openlayers 3 drawing interaction

For drawing Polygon in OpenLayers 2 we could use as follow: function drawEnd(){ ... } function putPoint(){ ... } function sketchModified(){ ... } function cancel(){ ... } var ...
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: ...
5
votes
2answers
838 views

Automate testing of web app based on ArcGIS JS API

So, there are multiple products that can let you automate testing interaction with web pages. I have used Selenium IDE for some time now and it works great for creating unit tests for HTML elements on ...
9
votes
4answers
12k 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) { ...
4
votes
4answers
10k views

How to use Google Maps V3 Geocode with Openlayers

How to use Google Maps V3 Geocode with Openlayers. Below is my code but the function does not execute when I try to integrate it with Openlayers. This works with my original google v3 file. Below is 2 ...
3
votes
1answer
2k views

Problems with gxp Print plugin via opengeosuite sdk

I am trying to import the print plugin within an application built using the Opengeo Suite sdk and I have run into issues as is described in the following thread ...
4
votes
1answer
1k views

Cartodb - SQL query of public visualization of a private table

The team at CartoDB have recently(last few days) made some useful updates that now allow public visualisation maps to reference data in private tables. The change has only been made in the last day ...
2
votes
2answers
985 views

Add a legend in an ArcGIS Javascript API

I am quite new to Javascript. I have made a html script that includes services I published to ArcGIS for server. It all does exactly what I want and I made it by copying working scripts together and ...
14
votes
2answers
22k 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
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 ...
5
votes
5answers
5k views

How to get a Leaflet app with a big GeoJSON file to work on mobile devices?

I have a leaflet app which displays a GeoJSON file as a layer. It works fine in the web browser. On the mobile browser it starts up, but quits after panning around on the map. I think the reason for ...
5
votes
3answers
9k views

Using the Proj4js library to convert from Google Maps to projected values

I'm using the proj4s javascript library (based on advice from this question I asked previously) to convert lat/long values on my webpage. This page receives the lat/long values from google maps and ...
9
votes
2answers
2k views

Restrict pan and zoom in ArcGIS Javascript API?

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 ...
7
votes
3answers
2k views

Mobile offline mapping and editing of shapefiles?

I've got a client that wants to create a mobile app that can view and edit shapefiles stored locally on the device to enable it to work offline. There is a possibility of converting the shapefiles to ...
6
votes
1answer
181 views

Making a 3D map with shapefiles, lidar and aerial image data

I want to try to make a simple 3D map for a small area (10 square miles) with some housing, some roads and some vegetation on it. My geodata is as follows: shapes with houses/roads/vegetation. ...
4
votes
4answers
3k views

How can I find closest point on a polygon from a point

I have a point that may be inside or outside of a polygon, I need to find the nearest point on the polygon boundary from the point. Point(x,y) may be inside or outside of the polygon, shortest ...
4
votes
2answers
4k views

Hiding infoWindow of ArcGIS API for JavaScript while using measure tool?

In my Javascript API Web application I'm using the infoWindow to query a parcel layer and display display information in a popup when I click the parcel. I've set this functionality to turn on and off ...
3
votes
1answer
5k views

How can GeoJson polygons be colored programmatically using OpenLayers?

I'm experimenting with dynamically setting the color values of a geojson polygon. In my geojson file, there is an attribute for each polygon called pop_den. I am trying to update the fillcolor of the ...
3
votes
3answers
7k views

How to dynamically update a KML layer in OpenLayers 2.10?

Arguably, this is a easy question for you guys GIS expert. Here is the question, how to outsource a dynamic KML file using JavaScript in OpenLayers. I want to refresh every 7 seconds. Below are ...
1
vote
2answers
6k views

How to get GeoJSON features using OpenLayers?

Can anybody explain how to get geojson features .Can somebody show way to get attributes from geojson text. OpenLayers.ProxyHost = "/gt/proxy.cgi?url="; var lon = 5; var lat = 44; var ...
4
votes
2answers
2k views

How to get layer type in OpenLayers 3?

I would like to iterate through all of the added layers in an ol.Map instance and only select the vector layers. So far I could get the individual layers with the a property of the resulting object of ...
4
votes
2answers
2k views

Identify all layers on the map without pre-designing the infoWindow

This applies to the ArcGIS Server JavaScript API 2.4. The Identify Task sample shows how IdentifyTask can be used to find features in multiple layers, as specified in the IdentifyParameters: ...
3
votes
1answer
45 views

Geotools 12.3 creating shape file from coordinates

I want to export a vector layer to a shape file (create a zip file with .dbf, .fix. prj and .shp), but when the exported .shp file is opened in a Desktop GIS it doesn't show anything. For the ...
2
votes
1answer
129 views

Create Chart from Query Task

I need to create a chart from the result of a query task using Esri JS API. Note, the chart does not have to be created with Esri API, but the query runs in that. The result is written to the DOM ...
2
votes
1answer
793 views

How to display labels - created using LabelLayer only at certain scales

I am using ESRI Javascript 3.7 framework to develop a map application, in it I am trying to display labels created using LabelLayer at certain scales only, say from 1:1 to 1:500 scale only, how can I ...
2
votes
2answers
3k views

Spatial query in ArcGIS Javascript Api 3.1

I have scenario in which I have to select features drawing a polygon and and get the attribute values in to a tables or lists.The features on the map consist of polygon, line,point at the same time so ...
2
votes
2answers
2k views

How to skip drag event to stop a feature being dragged

I am new to OpenLayers and I'm trying to drag markers and skip some markers from being dragged, I've tried dragFeature.deactivate(); it will deactivate entire features please help me. Please check ...
2
votes
1answer
986 views

Syntax of WFS request in OpenLayers

I am in need of the correct syntax for loading WFS layer using OpenLayers. I have gone through many examples on the OpenLayers site and other examples, but can't figure out how to use the necessary ...
1
vote
1answer
98 views

why doesn't show feature on map

this is fiddle Link.Feature doesn't show on map when it has been like this code : var featureVectorLayer = new ol.layer.Vector({ source: featureClusterSource, style: new ol.style.Style({ ...
1
vote
1answer
749 views

How to add a bounding box to openlayers 3 map

I have build a simple map using openlayer 3 , have a look at the code below: JS code: var map; function init(){ map = new ol.Map({ target:'map', renderer:'canvas', view: ...
1
vote
2answers
372 views

Fly To Location in Leaflet

Is it possible to 'fly to location' in Leaflet in the same way as this Mapbox GL example?
1
vote
1answer
324 views

Adding MapServer layer in Openlayers 3

As per i know that there is an API called Openlayers.MapServer in openlayers 2, which is used to show MapServer file in browser in openlayers. How can i add an MapServer file in Openlayers 3, as i ...
1
vote
1answer
5k views

How to draw a line between markers in openlayers

how to draw the line between markers, coordinates of markers undertake from a DB. whether it is possible to draw in general lines between markers, I saw examples only with points. markers = new ...
1
vote
2answers
967 views

OpenLayers.Class with OpenLayers.Control.GetFeature

I'm wondering if someone could point me in the right direction to force the BBOX of OpenLayers.Control.GetFeature to be always in long/lat coordinates. I'm trying to get this with OpenLayers.Class, so ...
1
vote
1answer
675 views

Unproject Radius with Openlayers with CRS:84 Projection

I have made a Openlayers integrated map that lets you draw a circle, On completion of the circle I have told the map to give me , Bounds, Center Long and Lats, and lastly the radius. My problem is ...
1
vote
2answers
680 views

How to prevent automatic new line when labeling point feature class?

I have a point feature class that I am labelling with the string "EXIT" for a majority of points, but some points will be longer, such as "EXIT into Pacific". I wrote a labeling script that will ...
0
votes
1answer
169 views

CartoDB layer not showing up on over mapbox layer but legend is

Currently, the legend is only displaying but not the layer. NOTE: I am trying to run the web map on a bootstrap modal, hence you will see: $('#webmap-modal').on('shown.bs.modal', function() in the ...
0
votes
0answers
72 views

browser crashes when loading legends at startup

After much perusing for solutions, I've decided to post my problem as a question. I'm trying to load the legends that are built into the ArcGIS Service Layers I'm using. I'm loading about 7 Dynamic ...
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 ...
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 ...
11
votes
1answer
19k 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 ...
7
votes
2answers
58k views

How do you get the coordinates from a click or drag event in the Google Maps API V3?

I have made a Google Version 3 Geocoder , I want to be able to pick up the coordinates of the marker when it is dragged or clicked. Below is my code: <!DOCTYPE html> <html> <head> ...
8
votes
1answer
9k 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 ...
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 ...
14
votes
6answers
28k 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 ...