Update scatter plot chart

Improve logic for drawing scatter plot chart

public/js/dropDownList.js

@@ -7,14 +7,14 @@ import {
   getDatastreamUrl,
   getObservationsUrl,
   axiosGetRequest,
-  getDatastreamMetadata,
+  getMetadataFromSingleDatastream,
   formatDatastreamMetadataForChart,
   formatSTAResponseForHeatMap,
   drawHeatMapHC,
-  formatSTAResponseForLineChart,
+  formatSTAResponseForLineChartOrScatterPlot,
   drawLineChartHC,
   getCombinedObservationsFromAllNextLinks,
-  getMetadataPlusObservationsForChart,
+  getMetadataPlusObservationsFromSingleDatastream,
 } from "./appChart.js";
 
 const buildingsAvailableSensorsArr = [
@@ -289,16 +289,18 @@ const selectChartTypeFromDropDown = async function () {
     const URL_OBSERVATIONS = getObservationsUrl(BASE_URL, selectedDatastream);
 
     // Create promises
-    const promiseDatastreamMetadata = getDatastreamMetadata(URL_DATASTREAM);
+    const promiseDatastreamMetadata =
+      getMetadataFromSingleDatastream(URL_DATASTREAM);
     const promiseCombinedObservations = getCombinedObservationsFromAllNextLinks(
       axiosGetRequest(URL_OBSERVATIONS, QUERY_PARAMS_COMBINED)
     );
 
     // Pass promises to our async function
-    const metadataPlusObservations = await getMetadataPlusObservationsForChart([
-      promiseCombinedObservations,
-      promiseDatastreamMetadata,
-    ]);
+    const metadataPlusObservations =
+      await getMetadataPlusObservationsFromSingleDatastream([
+        promiseCombinedObservations,
+        promiseDatastreamMetadata,
+      ]);
 
     // Extract the metadata and the observations from resulting array
     const combinedObs = metadataPlusObservations[0];
@@ -306,7 +308,7 @@ const selectChartTypeFromDropDown = async function () {
 
     if (selectedChartType === "Line") {
       drawLineChartHC(
-        formatSTAResponseForLineChart(combinedObs),
+        formatSTAResponseForLineChartOrScatterPlot(combinedObs),
         formatDatastreamMetadataForChart(datastreamMetadata)
       );
     } else if (selectedChartType === "Heatmap") {