Updated pagination next/previous detection. Resolves #1063. (#1158)

Author: MillenniumFalconMechanic

spa/src/app/files/hca-table-pagination/hca-table-pagination.component.ts

@@ -112,25 +112,25 @@ export class HCATablePaginationComponent implements OnInit {
     }
 
     /**
-     * Check if there is a next page.
+     * Check if there is a next page. Use search_after_uid and not search_after as null is a valid value for
+     * search_after.
      *
      * @param {PaginationModel} pm
      * @returns {boolean}
      */
     public hasNext(pm: PaginationModel): boolean {
-        // return (pm.from + pm.count) < pm.total;
-        return pm.search_after !== null;
+        return pm.search_after_uid !== null;
     }
 
     /**
-     * Check if there is a previous page.
+     * Check if there is a previous page. Use search_before_uid and not search_before as null is a valid value for
+     * search_before.
      *
      * @param {PaginationModel} pm
      * @returns {boolean}
      */
     public hasPrevious(pm: PaginationModel): boolean {
-        // return (pm.from > 1);
-        return pm.search_before !== null;
+        return pm.search_before_uid !== null;
     }
 
     /**

spa/src/app/files/shared/files.service.ts

@@ -355,14 +355,15 @@ export class FilesService {
             paramMap["order"] = tableParams.order;
         }
 
-        // check if there is paging
-        if ( tableParams.search_after && tableParams.search_after_uid ) {
+        // check if there is paging - use search_after_uid and not search_after as null is a valid value for search_after
+        if ( tableParams.search_after_uid ) {
 
             paramMap["search_after"] = tableParams.search_after;
             paramMap["search_after_uid"] = tableParams.search_after_uid;
         }
 
-        if ( tableParams.search_before && tableParams.search_before_uid ) {
+        // Use search_before_uid and not search_before as null is a valid value for search_before
+        if ( tableParams.search_before_uid ) {
 
             paramMap["search_before"] = tableParams.search_before;
             paramMap["search_before_uid"] = tableParams.search_before_uid;