Sorting by date only if no search string

src/app/datasets/components/results/results.component.ts

@@ -94,7 +94,6 @@ export class ResultsComponent implements OnInit, OnDestroy {
       // We need to make an initial request to get the aggregations and subaggregations
       this._datasetResearchService.getResults().subscribe(() => {
         // Create the ESOptions
-        
         const options = this._researchUrlService.getOptionsFromParameters(params);
         this._datasetResearchService.elasticSearchOptions.setElasticsearchOptions(options);
         // Force to recalculate the aggregate counts

src/app/datasets/components/sort/sort.component.ts

-import { Component, OnInit } from '@angular/core';
+import {Component, OnDestroy, OnInit} from '@angular/core';
 import { DatasetResearchService } from '../../services';
 import { geosource } from '../../../../i18n/traductions';
+import { Subscription } from 'rxjs';
 
 interface IDropdownOptions {
   'label': string;
@@ -14,13 +15,15 @@ interface IDropdownOptions {
   templateUrl: './sort.component.html',
   styleUrls: ['./sort.component.scss'],
 })
-export class SortComponent implements OnInit {
+export class SortComponent implements OnInit, OnDestroy {
 
   // Options list for the sort dropdown
   options: IDropdownOptions[];
   // Selected value of the dropdown
   selectedOption: IDropdownOptions;
 
+  searchChangeSubscription: Subscription;
+
   dropDownFormatsToggle: boolean = false;
 
   constructor(
@@ -61,14 +64,20 @@ export class SortComponent implements OnInit {
   }
 
   ngOnInit() {
-    this.selectedOption = this.options.find(
-      e => (
-        e.value === this._datasetResearchService.sortOptions.value &&
-        e.order === this._datasetResearchService.sortOptions.order
-      ),
+    this.selectedOption = this.getOptionFromValueAndOrder(this._datasetResearchService.sortOptions);
+    this.searchChangeSubscription = this._datasetResearchService.searchChange$.subscribe(
+      (sortOption: any) => {
+        if (sortOption && sortOption.value && sortOption.order) {
+          this.sortValueChanged(this.getOptionFromValueAndOrder(sortOption));
+        }
+      },
     );
   }
 
+  ngOnDestroy(): void {
+    this.searchChangeSubscription.unsubscribe();
+  }
+
   sortValueChanged(option) {
     this.selectedOption = option;
     this._datasetResearchService.sortChanged({
@@ -81,4 +90,12 @@ export class SortComponent implements OnInit {
     return this._datasetResearchService.isLoading;
   }
 
+  private getOptionFromValueAndOrder(sortOption) {
+    return this.options.find(
+      e => (
+        e.value === sortOption.value &&
+        e.order === sortOption.order
+      ),
+    );
+  }
 }

src/app/datasets/services/dataset-research.service.ts

@@ -463,6 +463,8 @@ export class DatasetResearchService {
     this._elasticsearchOptions.searchString = value;
     this._elasticsearchOptions.pageIndex = 0;
     this._elasticsearchOptions.shouldAggregateResultCount = true;
+    this._elasticsearchOptions.sortOptions.value = (value && true) ? 'relevance' : 'date';
+    this._elasticsearchOptions.sortOptions.order = 'desc';
     if (this._router.url.split('/').pop() !== AppRoutes.research.uri) {
       if (value === '') {
         this._router.navigate(['/', `${AppRoutes.research.uri}`]);
@@ -472,7 +474,7 @@ export class DatasetResearchService {
     }
 
     this._researchUrlService.setParameter('q', value);
-    this._searchChangeSubject.next();
+    this._searchChangeSubject.next(this._elasticsearchOptions.sortOptions);
   }
 
   scopeChanged(scope: IScope) {

src/app/elasticsearch/models/elasticsearch-options.model.ts

@@ -66,7 +66,7 @@ export class ElasticsearchOptions {
 
     // Need to be done in order to avoid object reference copy
     this._sortOptions = {
-      value: 'date',
+      value: (data && data.searchString != null) ? 'relevance' : 'date',
       order: 'desc',
     };
     if (data && data.sortOptions != null) {
@@ -149,7 +149,7 @@ export class ElasticsearchOptions {
 
     // Need to be done in order to avoid object reference copy
     this._sortOptions = {
-      value: 'date',
+      value: (data && data.searchString != null) ? 'relevance' : 'date',
       order: 'desc',
     };
     if (data && data.sortOptions != null) {