Expand the Measured Dashboard to All Schools and Districts. [Finishes #179727798]

app/assets/javascripts/dashboard.js

@@ -0,0 +1,34 @@
+document.addEventListener("DOMContentLoaded", function() {
+  const selectSchoolElement = document.querySelector('#select-school');
+
+  selectSchoolElement.addEventListener('change', (event) => {
+    change_school(event);
+  });
+
+  const selectDistrictElement = document.querySelector('#select-district');
+
+  selectDistrictElement.addEventListener('change', (event) => {
+    change_district(event);
+  });
+});
+
+function change_school(event) {
+  const school_slug = event.target.value;
+
+  const district_regex = /districts\/(.+)\/schools/;
+  const district_slug = window.location.pathname.match(district_regex)[1];
+
+  const year_range_regex = /year=(.+)/;
+  const year_range = window.location.search.match(year_range_regex)[1];
+
+  window.location = `/districts/${district_slug}/schools/${school_slug}/dashboard?year=${year_range}`;
+};
+
+function change_district(event) {
+  const district_slug = event.target.value;
+
+  const year_range_regex = /year=(.+)/;
+  const year_range = window.location.search.match(year_range_regex)[1];
+
+  window.location = `/districts/${district_slug}/schools/first/dashboard?year=${year_range}`;
+};