Send years with HTML

static/script.js

-/**
- * Known plottable years for each station.
- */
-const fetchedYears = {};
-
 /**
  * Fetch year options and put them in one selector.
  */
 function getYears(n) {
   clearYears(n);
   const station = selectVal(suffixID('station', n));
-  fetchYears(station, years => {
+  const years = recordYears[station];
   appendYears(years, n);
-  });
 }
 
 /**
@@ -21,10 +15,9 @@ function boxplotGetYears() {
   clearYears(1);
   clearYears(2);
   const station = selectVal('station');
-  fetchYears(station, years => {
+  const years = recordYears[station];
   appendYears(years, 1);
   appendYears(years, 2);
-  });
 }
 
 /**
@@ -51,22 +44,6 @@ function clearYears(n) {
   yearSelect.options.length = 1;
 }
 
-/**
- * Call `callback(years)` after fetching years for the given station.
- */
-function fetchYears(station, callback) {
-  if (fetchedYears.hasOwnProperty(station)) {
-    callback(fetchedYears[station]);
-  } else {
-    fetch(`${$SCRIPT_ROOT}/record/years${paramString({station})}`)
-      .then(response => response.json())
-      .then(years => {
-        fetchedYears[station] = years;
-        callback(years);
-      });
-  }
-}
-
 function indexVisualize() {
   const params = {
     station: selectVal('station'),

templates/base.html

@@ -8,6 +8,7 @@
   <link rel="stylesheet" href="https://amrdc.ssec.wisc.edu/wp-test/wp-content/themes/amrdc-theme/dist/fonts/uw160/fonts.css?ver=1.0.0">
   <script>
     const $SCRIPT_ROOT = {{ request.script_root | tojson }};
+    const recordYears = {{ g.record_years | tojson }};
   </script>
   <script defer src="{{ url_for('static', filename='script.js') }}"></script>
 </head>

visualizer.py

@@ -106,14 +106,6 @@ def boxplot():
     return render_template('boxplot.html')
 
 
-@app.route('/record/years')
-def record_years():
-    """Return a list of years for the selected station."""
-    station = get_station(get_param('station'))
-    years = [i['year'] for i in station['records']]
-    return jsonify(years)
-
-
 @app.route('/record/link')
 def record_link():
     """Return the source link for the selected dataset."""
@@ -303,7 +295,14 @@ def savefig_response(fig):
 
 def populate_g():
     """Populate `g` with data for rendering page templates."""
-    g.stations = read_stations()
+    stations = read_stations()
+    g.stations = stations
+
+    def id_years(station):
+        years = [record['year'] for record in station['records']]
+        return station['id'], years
+
+    g.record_years = dict(map(id_years, stations))
 
 
 def read_stations():