Added loading state to ViewObservations

frontend/src/views/ViewObservations.vue

@@ -126,6 +126,9 @@
       </b-card>
       <b-button class="mt-2" variant="success" @click="getCSV()">CSV Dump</b-button>
     </b-container>
+    <b-container v-else-if="loading">
+      Loading...
+    </b-container>
     <b-container v-else>
       <b-row>
         <b-col>
@@ -152,7 +155,8 @@ export default {
     return {
       observationData: null,
       errorStatus: null,
-      errorMessage: null
+      errorMessage: null,
+      loading: false
     };
   },
   computed: {
@@ -175,6 +179,7 @@ export default {
   },
   methods: {
     getFiltered: function() {
+      this.loading = true
       Vue.axios
         .post("/observations", {
           site: this.$store.state.search.site,
@@ -186,11 +191,13 @@ export default {
         })
         .then(response => {
           this.observationData = response.data;
+          this.loading = false
         })
         .catch(error => {
           this.errorStatus = error.response.status;
           this.errorMessage = error.response.data;
           this.$refs.errorModal.show();
+          this.loading = false
         });
     },
     getCSV: function() {