topic geoprocessing service no response with Leaflet in Open Source Mapping Libraries Ques.

geoprocessing service no response with Leaflet

GrantHaynes — Mon, 28 Aug 2023 12:59:11 GMT

Hi all,

I'm using leaflet to create a time series web map where a user can place a point on a map and the values at that lat and long will be graphed on the web page. I have a geoprocessing service that runs fine, I've tested it in arcmap and it works great it accepts lats and longs and spits out the extracted data values. I also have a web page that allows a user to create points and produces lats and longs to be passed back to the geoprocessing service. However I cannot get the two to talk to each other, can anyone here tell me what is wrong?

var map = L.map('map').setView([0, 0], 2);

L.esri.basemapLayer('Gray').addTo(map);

map.on('click', addMarker);

var MarkerLayer = new L.FeatureGroup();

map.addLayer(MarkerLayer);

var Coordinates = [];

function addMarker(e){

Marker = new L.marker(e.latlng).addTo(MarkerLayer);

Coordinates.push(e.latlng);

}

function ClearMarker(){

MarkerLayer.clearLayers();

Coordinates = [];

}

function Geoprocessing(){

// Go through coordinates generated from leaflet and split them

// up to be passed to the geoprocessing service

Coordinates.forEach(function(item){

var Results = [];

var StrItem = String(item);

var StrParts = StrItem.split(",");

var Lat = StrParts[0].slice(7);

var Long = StrParts[1].substring(0, StrParts[1].length - 1);

//execute geoprocessing service each time a lat and long are generated

var gpService = L.esri.GP.service({

url: "https://localhost:6443/arcgis/rest/services/Test/Value_Extraction_VI/GPServer",

useCors:false

});

var gpTask = gpService.createTask();

gpTask.setParam("InputX", Long);

gpTask.setParam("InputY", Lat);

gpTask.run(DataCallBack);

})

// Handle server response

function DataCallBack(error, raw, response)

{

window.alert(error.message);

}

</script>

Re: geoprocessing service no response with Leaflet

JohnGravois — Mon, 03 Dec 2018 17:19:53 GMT

> However I cannot get the two to talk to each other.

are you saying you can't get your webpage to talk to ArcMap?

or are you saying you can't figure out how to invoke the GP service using the coordinates that the user drew in the esri-leaflet app?

Re: geoprocessing service no response with Leaflet

GrantHaynes — Mon, 03 Dec 2018 18:24:57 GMT

The later. I accessed the GP service from ArcMap to test it.

Re: geoprocessing service no response with Leaflet

JohnGravois — Sun, 12 Dec 2021 10:13:59 GMT

you need to call Geoprocessing() from within your `addMarker()` function.

bonus points if you start passing through the latitude and longitude as arguments instead of relying on a global variable.

ex:

Geoprocessing(e.latlng.lng, e.latlng.lat)‍‍

// ...

function Geoprocessing(long, lat) {
})‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: geoprocessing service no response with Leaflet

GrantHaynes — Mon, 03 Dec 2018 22:55:17 GMT

Thanks, that really cleaned up the code, but I still am getting a null response from the service, I'm using a window.alert to verify the server response, could I be missing something in the DataCallBack function?

function addMarker(e){

Marker = new L.marker(e.latlng).addTo(MarkerLayer);

Geoprocessing(e.latlng.lng, e.latlng.lat);

}

// Clear markers

function ClearMarker(){

MarkerLayer.clearLayers();

}

function Geoprocessing(Long, Lat){

//execute geoprocessing service with lat and long produced by user input

var gpService = L.esri.GP.service({

url: "https://localhost:6443/arcgis/rest/services/Test/Value_Extraction_VI/GPServer",

useCors:false

});

var gpTask = gpService.createTask();

gpTask.setParam("InputX", Long);

gpTask.setParam("InputY", Lat);

gpTask.run(DataCallBack);

// Handle server response

function DataCallBack(error, raw, response)

{

window.alert(raw);

window.alert(response);

}

</script>

</div>

Re: geoprocessing service no response with Leaflet

JohnGravois — Tue, 04 Dec 2018 00:40:34 GMT

try snooping the web traffic to see the actual request and response.

Re: geoprocessing service no response with Leaflet

GrantHaynes — Fri, 21 Dec 2018 03:18:18 GMT

So I'm not much of a web guy, how do you do that? or could you point me to some resources on it?

Re: geoprocessing service no response with Leaflet

JohnGravois — Fri, 21 Dec 2018 19:32:50 GMT

i meant open the developer tools in your browser and inspect the individual requests and responses.

Re: geoprocessing service no response with Leaflet

GrantHaynes — Sat, 22 Dec 2018 03:41:23 GMT

Thanks, when I run the developer tools in chrome and place points on the page I get the following messages.

http://www.esrs.wmich.edu/arcgis/rest/services/test/Grant_Timeseries_Test_Tool/GPServer/execute?InputX=-88.9453125000000…

window._EsriLeafletCallbacks.c9({"error":{"code":400,"message":"Invalid URL","details":[]}});

http://www.esrs.wmich.edu/arcgis/rest/services/test/Grant_Timeseries_Test_Tool/GPServer/?callback=window._EsriLeafletCal…

window._EsriLeafletCallbacks.c0({"currentVersion":10.5,"serviceDescription":"","tasks":["Value Extraction Tool"],"executionType":"esriExecutionTypeSynchronous","resultMapServerName":"","maximumRecords":1000});

I'm guessing then it means that the URL to the geoprocessing service is bad, and since the URL to the service itself is fine, I'm guessing that the problem is in the constructed part of the URL that passes parameters back to the service.

Re: geoprocessing service no response with Leaflet

JohnGravois — Sat, 22 Dec 2018 17:54:44 GMT

there's no need to guess. inspect the url and the request parameters for a successful request when visiting the raw service endpoint and compare and contrast that with what's being sent from your esri-leaflet app.

Re: geoprocessing service no response with Leaflet

GrantHaynes — Thu, 27 Dec 2018 17:06:46 GMT

Thanks, I fixed the URL and I'm getting a response from the service. Do you know how synchronous geoprocessing services return non layer results? Is it dictated by the output data type of the published geoprocessing task?

Re: geoprocessing service no response with Leaflet

JohnGravois — Thu, 27 Dec 2018 17:58:10 GMT

yup. you can configure GP services to output all sorts of different results.

Re: geoprocessing service no response with Leaflet

GrantHaynes — Thu, 27 Dec 2018 20:58:41 GMT

That's what I thought, this service as it stands returns a text file, I want the values in the text file for graphing in the web browser. I'm pretty sure I need to change the script and republish the service with a result data type that is more suitable, but is there a way to achieve that with the existing service?