Develop Reference

VectorLayer not showing with OpenLayers

I'm basically trying to reproduce the center example in my own JsFiddle
const geoJSON = {};
const features = new ol.format.GeoJSON().readFeatures(geoJSON);
const vectorSource = new ol.source.Vector({
features: features,
});
const style = new ol.style.Style({});
const vectorLayer = new ol.layer.Vector({
source: vectorSource,
style: style,
});
let olView = new ol.View({
center: ol.proj.fromLonLat([6.6339863, 46.5193823]),
zoom: 4,
});
let olLayers = [
new ol.layer.Tile({
source: new ol.source.OSM(),
}),
vectorLayer
];
new ol.Map({
layers: olLayers,
view: olView,
target: 'app',
});
I must be missing somethig obvious, as the vector layer isn't showing in my fiddle.

If you pan down you will see the vector for Switzerland is in the wrong place
If using readFeatures you need to specify the feature projection so the geojson Lon/Lat coordinates are transformed to view projection
const features = new ol.format.GeoJSON().readFeatures(geoJSON, {featureProjection: olView.getProjection()});
https://jsfiddle.net/apowe4gj/

how to display TMS layer in Open Layers 3?

I want to display tms layer in ol3.
var layer = 'india:Indian_gdp_119';
var projection_epsg_no = '4326';
var map = new ol.Map({
target: 'map',
view: new ol.View({
center: ol.proj.transform([77.39907,28.58920], 'EPSG:4326', 'EPSG:3857'),
zoom:2 }),
layers: [new ol.layer.VectorTile({
style:simpleStyle,
source: new ol.source.VectorTile({
tilePixelRatio:1 ,
tileGrid: ol.tilegrid.createXYZ({maxZoom: 19}),
format: new ol.format.MVT(),
url: 'http://localhost/geoserver/gwc/service/tms/1.0.0/' + layer +
'#EPSG%3A'+projection_epsg_no+'#pbf/{z}/{x}/{-y}.pbf' }) })]});
In geoserver and ol3 pbf format is not working,getting same error in geoserver and ol3.
Error::
http://localhost/geoserver/gwc/service/tms/1.0.0/india:Indian_gdp_119#EPSG%3A4326#pbf/2/1/1.pbf 404 (Not Found)
Is there any mistake in this code.Thanks

How do I trigger an on demand refresh/redraw of ol.Map

I have a function called "LoadMap"
rcisWebMapLoad.prototype.LoadMap = function (param1, param2) {
//Get some vector objects and create layers
var fieldVectorObjs = rcisWebMapVectorObjs.GetFieldVectorObjects(param1, param2);
var objectVectorLines = rcisWebMapVectorObjs.GetLinesVectorObjects(param1, param2, 1);
//Create Map object and add layers then insert into map div
control.map = new ol.Map({
target: 'map',
renderer: 'canvas',
layers: layers,
view: new ol.View({
projection: 'EPSG:4326',
center: [0, 0],
zoom: 8
})
});
//******* MapServer imagery ***************
var aerial = new ol.layer.Tile({
name: 'Imagery',
source: new ol.source.TileWMS({
url: mapServerPath.ResponseString,
params: { 'LAYERS': 'aerial', 'FORMAT': 'image/png', 'TILED': true },
serverType: 'mapserver'
})
});
control.map.addLayer(aerial);
}
This loads the map great!!
I have my imagery and vector objects on the map...however the problem comes when I want to switch to a different map ie.(Different imagery and vector objects)...
UPDATE:
originally I thought the map was not getting updated but in reality another map get's generated and added right under the original map...How do I reuse or replace the map object that is already there to display another map?
Because I'm using AngularJS and passing the maps parameters through a service I can not just call the page again and get the parameters from the query string as someone suggested to me before.
This seems like something that would be a main function for an online map.
Any help is greatly appreciated

Okay, so I was not able to force an on-demand refresh of the map object for OpenLayers 3.
So what I ended up doing was to destroy the map object and create a new one each time.
so for the example above it would look like this...
For angularJS users you also need to make sure that you create an empty map in your .factory load function (so there is something to destroy initially)...if you're not using angular you would just need to create the map on page load.
function rcisWebMapLoad() {
this.map = new ol.Map({});
}
rcisWebMapLoad.prototype.LoadMap = function (param1, param2) {
//Get some vector objects and create layers
var fieldVectorObjs = rcisWebMapVectorObjs.GetFieldVectorObjects(param1, param2);
var objectVectorLines = rcisWebMapVectorObjs.GetLinesVectorObjects(param1, param2, 1);
var layers = [];
Destroy map object before creating a new one
control.map.setTarget(null);
control.map = null;
//Create Map object and add layers then insert into map div
control.map = new ol.Map({
target: 'map',
renderer: 'canvas',
layers: layers,
view: new ol.View({
projection: 'EPSG:4326',
center: [0, 0],
zoom: 8
})
});
//******* MapServer imagery ***************
var aerial = new ol.layer.Tile({
name: 'Imagery',
source: new ol.source.TileWMS({
url: mapServerPath.ResponseString,
params: { 'LAYERS': 'aerial', 'FORMAT': 'image/png', 'TILED': true },
serverType: 'mapserver'
})
});
control.map.addLayer(aerial);
}

Getting typeError after adding layer to map

I go tthis type of error:
"Cannot read property 'closure_uid_521373967' of null".
This occures after i make source that contain no features yet.
var vectorSource = new ol.source.Vector({
});
after that i make a Layer
var vectorLayer = new ol.layer.Vector({
source: vectorSource
});
and then i init the map:
var map = new ol.Map({
layers: [new ol.layer.Tile({ source: new ol.source.OSM({url:"http://tile.openstreetmap.org/{z}/{x}/{y}.png"}) }), vectorLayer],
target: document.getElementById('map'),
view: new ol.View({
center: [0, 0],
zoom: 3
})
});
its seems to work fine in my home when it is simple as here , but when i try to make it work in my job , that the scanario is kind a bit more complicated , i lack that type of error that i mention before.

Please view this Snippet.
It is a good idea to separate layer definition from map instantiation. The latter makes things very convenient, but it makes things difficult for debugging.
With that in mind, I defined an OSM Layer and your Vector layer and added both to a map.
You don't need to use getElementById. You can simply supply the id of the div as the target of the map.
I'm not able to replicate your TypeError. My suspicion is that it came from the addition of the unnecessary getElementById, though.
Can you post a link to the code that's not working?
// layers
var vectorSource = new ol.source.Vector({
});
var vectorLayer = new ol.layer.Vector({
source: new ol.source.Vector({
url: vectorSource,
})
});
var osmLayer = new ol.layer.Tile({
source: new ol.source.OSM()
});
var map = new ol.Map({
layers: [osmLayer, vectorLayer],
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 3
})
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.6.0/ol.js"></script>
<body>
<div id='map'>
</div>
</body>

how can i dynamically update a ol.Features geometry property ( coordinates ) in OpenLayers 3

Im just getting started with OpenLayers 3 and i am trying to dynamically update a Features geometry property with coordinates, obviously there is something that i am missing out because the Feature is not moving. Here is what i god so far:
Socket.IO
socket.on('mapData', function(mapData) {
if (mapisloaded) {
latLon = ol.proj.transform([mapData.lon, mapData.lat], 'EPSG:4326', 'EPSG:3857');
// Initiate latlong object with mapData
if (centerIsRequested) {
//Center map with mapData
};
// Update marker with latlong from mapData
};
});
OpenLayers 3 based on the Vector Icon Example
var latLon = ol.proj.transform([10.904108, 59.788187], 'EPSG:4326', 'EPSG:3857');
var iconFeature = new ol.Feature({
geometry: new ol.geom.Point(latLon),
name: 'Null Island',
population: 4000,
rainfall: 500
});
var iconStyle = new ol.style.Style({
image: new ol.style.Icon(/** #type {olx.style.IconOptions} */ ({
anchor: [0.5, 46],
anchorXUnits: 'fraction',
anchorYUnits: 'pixels',
opacity: 0.75,
src: 'imgs/lc.png'
}))
});
iconFeature.setStyle(iconStyle);
var vectorSource = new ol.source.Vector({
features: [iconFeature]
});
var vectorLayer = new ol.layer.Vector({
source: vectorSource
});
var baseLayer = new ol.layer.Tile({
source: new ol.source.OSM()
});
var view = new ol.View({
center: latLon,
zoom: 18,
});
var map = new ol.Map({
target: 'map-canvas',
layers: [ baseLayer, vectorLayer ],
view: view
});
The changes are obviously not changing, but i know that magic does not exist it was just to put something down to start with.
How wouldi go forward accomplish this simple task? The only thing i want is the icon to update its position on the map when socket.io detects the new mapdata (mapData.lat, mapData.lon).
I have tried to dig into the different objects and read their properties both in the console and in the documentation, and i have searched here on Stackoverflow but sadly without luck. Do i hook into the iconFeature, or do i have to do this another way? Maybe something really easy is built in? Any help is much appreciated.

If you want to move an icon over the map, it's better you use an ol.Overlay for this. You can use marker.setPosition(coord) on each change.
A working fiddle. Click on map to change marker's position.