I have been trying to load Map using ArcGIS Services but getting some errors which I am unable to fix - salesforce-lightning

Our requirement is to load Map using ArcGIS JS in the Salesforce. I tried to implement the sample code mentioned at the link (https://developers.arcgis.com/javascript/latest/display-a-map/) using LWC. After implementing the code in LWC , when I was trying to load the map, it was giving me the errors like shown below.
enter image description here
In the Javascript file of LWC bundle, there is a logic like below.
require(["esri/config","esri/Map","esri/views/View"], function (esriConfig,map1,view1) {
esriConfig.apiKey = "AAPK5f40f4c3fea2450bab57cb033d6730dfV4SOorOlBpDGRBnkbgikiNIP2kSnYcybTJ9qkTSHPBegoYNlxKYLqMSnSo0fDtjZ";
const map2 = new map1({
basemap: "arcgis-topographic" // Basemap layer service
});
console.log('viewDiv Node');
console.log(viewDiv);
const view2 = new view1({
map: map2,
center: [-118.805, 34.027], // Longitude, latitude
zoom: 13, // Zoom level
container: viewDiv
});
console.log('all the lines are executed successfully inside the require callback function');
});
All the function inside the require callback function seems to be working fine in the LWC because I am able to get the line 'all the lines are executed successfully inside the require callback function' printed successfully in the console. when the map view is about to get rendered in the UI, it shows the error message as shown in the above screenshot attached.
How can I fix the issue?

Related

Flask-Admin GeoAlchemy2 example doesn't show a map

I'm trying to run this example about how to use Flask-Admin displaying maps: https://github.com/flask-admin/flask-admin/tree/master/examples/geo_alchemy.
In README.rst, there's this instruction:
You will notice that the maps are not rendered. To see them, you will have to register for a free account at Mapbox and set the MAPBOX_MAP_ID and MAPBOX_ACCESS_TOKEN config variables accordingly.
I already have a valid MAPBOX_ACCESS_TOKEN, and I went to MapBox to look for a MAPBOX_MAP_ID. There I read that MAP_ID was deprecated, and now I'll have to obtain a tileset ID, and it's described as a label composed by <my_mapbox_user_name>.the_tileset_ID itself.
So I located the code as they described in the instructions (in my case, mapbox-streets-v8) and fulfilled the config.py parameters:
MAPBOX_MAP_ID = '<my_mapbox_user_name>.mapbox-streets-v8'
MAPBOX_ACCESS_TOKEN = 'pk.eyJ1...'
However, I couldn't see any map displayed or any error message.
How can I fix it?
I think there is a small bug in file Lib\site-packages\flask_admin\static\admin\js\form.js. The original URL generated to get a tile is:
https://api.mapbox.com/styles/v1/mapbox/<MAPBOX_MAP_ID parameter>/tiles/12/2258/2457?access_token=<MAPBOX_ACCESS_TOKEN parameter>
However, the correct one is:
https://api.mapbox.com/styles/v1/<MAPBOX_MAP_ID parameter>/tiles/12/2258/2457?access_token=<MAPBOX_ACCESS_TOKEN parameter>
That is, I had to remove the mapbox word from the URL.
To do that I made some changes in form.js file:
//var mapboxUrl = 'https://api.mapbox.com/styles/v1/mapbox/'+window.MAPBOX_MAP_ID+'/tiles/{z}/{x}/{y}?access_token='+window.MAPBOX_ACCESS_TOKEN
var mapboxUrl = 'https://api.mapbox.com/styles/v1/'+window.MAPBOX_MAP_ID+'/tiles/{z}/{x}/{y}?access_token='+window.MAPBOX_ACCESS_TOKEN
Then, it's working now:

How to test leaflet based maps using testcafe?

We are building a series of tests using TestCafe. How do we test if a point or path in a leaflet control is rendered correctly? To be more specific we are trying to test the lat-lon data of a circle marker in the map. But, we do not have any leaflet map/marker object available in the scope of testcafe scripts.
References:
Unit testing leaflet maps
I created a simple example of an assertion for a path element in a leaflet control on the getting started demo page https://leafletjs.com/examples/quick-start/
import { Selector } from 'testcafe';
fixture `fixture`
.page `https://leafletjs.com/examples/quick-start/`;
test('test', async t => {
await t
.switchToIframe('iframe')
.expect(Selector('path').withAttribute('stroke', 'red').getAttribute('d')).eql('M141.20355555554852,171.94704600190744a42,42 0 1,0 84,0 a42,42 0 1,0 -84,0 ');
});
Please provide us with an example of your testing page so we will be able to offer you something more specific for your scenario.

Mapbox WMTS support in OpenLayers

I have created a Mapbox style using Mapbox Studio and set it to be used over WMTS. The URL of the style is:
https://api.mapbox.com/styles/v1/username/styleId/wmts?access_token=token
where styleId, username and token are variable fields.
When I try to create a WMTS layer in OpenLayers using the url above, the tileGrid is created successfully using createFromCapabilitiesMatrixSet but I get a response error Invalid query param layer from Mapbox.
After some investigation, I noticed that:
The response error persists for all query parameters that are appended from OpenLayers when creating the tile load function. It looks like that Mapbox does not recognise them properly.
OpenLayers website and Mapbox also give examples on using XYZ layers for integration between them.
So, is this some kind of unsupported feature of OpenLayers or do I need to configure anything additional when creating the WMTS OpenLayers?
It's much simpler to set up as a standard OpenLayers XYZ layer using
url: 'https://api.mapbox.com/styles/v1/username/styleId/tiles/{z}/{x}/{y}?access_token=token'
as in the examples.
Mapbox provides WMTS support for compatibility with some other systems. It can also be used in OpenLayers, the setup would be
var parser = new ol.format.WMTSCapabilities();
fetch('https://api.mapbox.com/styles/v1/username/styleId/wmts?access_token=token').then(function(response) {
return response.text();
}).then(function(text) {
var layer = new ol.layer.Tile({
source: new ol.source.WMTS(
ol.source.WMTS.optionsFromCapabilities(parser.read(text), {
layer: 'styleId',
matrixSet: 'EPSG:3857'
})
)
});
....
....
....
....
});
Both methods will ultimately load the same tile urls, so there's no advantage in using WMTS where XYZ is supported.

Leaflet offline map without map tiles

We developed a web page where we are showing health facility locations of a country on a map. We used Leaflet for the map display. We actually do not need to display the online map tiles in the background. If we can only show a vector country map that would also be OK. I came to know that tiles can be downloaded and saved offline in Leaflet etc, but not interested in that direction.
What I want is available in this page
Where Leaflet is used but the world map online tiles are not displayed. But the code is quite complex to understand. Is there any easy example or guidance to do what I need?
This is actually quite easy when using a L.GeoJSON layer. First off you would need to find the correct GeoJSON for the region you want to display. For instance, here are some for the US: http://eric.clst.org/Stuff/USGeoJSON. Next create a map like you would normally do:
var map = new L.Map('map', {
'center': [0, 0],
'zoom': 0
});
Then you would need to fetch/load your GeoJSON data into your script using ajax via jQuery or something else and use that to initialize a GeoJSON layer and add that to your map:
// jQuery ajax request
$.ajax({
// url with your geojson data file
'url': 'my.geo.json',
// return json object, not as string
'dataType': 'json',
// on success handle result
'success': function (result) {
// Initialize GeoJSON layer and add to map
var layer = new L.GeoJSON(result).addTo(map);
// Fit map to bounds of your GeoJSON
map.fitBounds(layer.getBounds());
}
});
That's it. You can find lots of GeoJSON datasets online and if you want to know more about the L.GeoJSON i would recommend reading the reference i linked earlier and this tutorial: http://leafletjs.com/examples/geojson.html

Use topoJSON in Leaflet map

I'm learning how to use Leaflet to make online interactive maps for public health purposes (experienced ArcGIS user, Mapbox TileMill). I'm taking it slow so I understand each piece of code, and I'm working from the Leaflet choropleth example as I want to make choropleth maps. The current task I'm stuck on is how to correctly add topoJSON data to a Leaflet map. I've tried the following code to convert the us states geoJSON to topoJSON, but it hasn't worked. Any suggestions?
var geojson;
var test = topojson.feature(us-states-topo, us-states-topo.objects.layer1 );
geojson = L.geoJson(test, {
style: style,
onEachFeature: onEachFeature
}).addTo(map);
I've reviewed the topoJSON API reference, but I'm sure I must be making a simple error as I am a beginner to JavaScript in general. Thank you all for your help!
Best
Eli
I'd recommend using your browser debug tools to start through debugging this.
var test = topojson.feature(us-states-topo, us-states-topo.objects.layer1 );
This is not valid JavaScript: us-states-topo is not a valid variable name, since -s are not permitted.