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serviço de geoprocessamento sem resposta com Leaflet

GrantHaynes

Olá a todos,

Estou usando leaflet para criar um mapa web de séries temporais onde um usuário pode colocar um ponto no mapa e os valores naquela latitude e longitude serão exibidos em gráfico na página web. Eu tenho um serviço de geoprocessamento que funciona bem, testei no arcmap e funciona perfeitamente, ele aceita latitudes e longitudes e retorna os valores extraídos dos dados. Também tenho uma página web que permite ao usuário criar pontos e gera latitudes e longitudes para serem passadas de volta ao serviço de geoprocessamento. No entanto, não consigo fazer os dois se comunicarem, alguém aqui pode me dizer o que está errado?

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(){

// Percorrer as coordenadas geradas pelo leaflet e separá-las

// para serem passadas ao serviço de geoprocessamento

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);

// executar o serviço de geoprocessamento cada vez que uma latitude e longitude são geradas

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);

} )

// Tratar resposta do servidor

function DataCallBack(error, raw, response)

{

window.alert(error.message);

}

</script>

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JohnGravois

> 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?

GrantHaynes

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

JohnGravois

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:

<SPAN class="token function">Geoprocessing</SPAN><SPAN class="punctuation token">(</SPAN>e<SPAN class="punctuation token">.</SPAN>latlng<SPAN class="punctuation token">.</SPAN>lng<SPAN class="punctuation token">,</SPAN> e<SPAN class="punctuation token">.</SPAN>latlng<SPAN class="punctuation token">.</SPAN>lat<SPAN class="punctuation token">)</SPAN>‍‍

<SPAN class="comment token">// ...</SPAN>

<SPAN class="keyword token">function</SPAN> <SPAN class="token function">Geoprocessing</SPAN><SPAN class="punctuation token">(</SPAN>long<SPAN class="punctuation token">,</SPAN> lat<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

GrantHaynes

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>

JohnGravois

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

GrantHaynes

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

JohnGravois

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

GrantHaynes

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.

JohnGravois

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.

GrantHaynes

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?

JohnGravois

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

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