Fix issues when smoothing value set to 0, it goes back to default 0.6. Tooltip...

Fix issues when smoothing value set to 0, it goes back to default 0.6. Tooltip sorting does not work because string mismatching. (#323)

frontend/src/scalars/ui/Chart.vue

@@ -55,7 +55,6 @@ import moment from 'moment';
 import {getPluginScalarsScalars} from '../../service';
 
 const originLinesOpacity = 0.3;
-const defaultSmoothWeight = 0.6;
 const lineWidth = 1.5;
 const minQuantile = 0.05;
 const maxQuantile = 0.95;
@@ -320,7 +319,7 @@ export default {
 
         transformDataset(seriesData) {
             // smooth
-            this.transformData(seriesData, this.smoothing || defaultSmoothWeight);
+            this.transformData(seriesData, this.smoothing);
         },
 
         /**
@@ -543,11 +542,11 @@ export default {
             }
             let sortedPoints;
             switch (sortingMethod) {
-                case 'desc':
+                case 'descending':
                     sortedPoints = sortBy(points, one => one.item[3]);
                     sortedPoints.reverse();
                     break;
-                case 'asc':
+                case 'ascending':
                     sortedPoints = sortBy(points, one => one.item[3]);
                     break;
                 case 'nearest':