mgr/dashboard: improve search and pagination behavior

add a throttle to the pagination cycle so that if you repeatedly try to
cycle through the page, it increases the delay. Doing this because
unlike search the button click to change page is deliberate and the
first click to the button should respond immediately.

another thing is that the search with a keyword stores every keystroke i
do in the search field and then after the debouncce interval it sends
all those request one by one.

for eg: if i type 222 it waits 1s for the
debounce timer and then sends a request to find osd with id 2 first then
again 2 and then again 2. Instead it should only send 222 at the end.

Fixes: https://tracker.ceph.com/issues/72979
Signed-off-by: Nizamudeen A <[email protected]>

Author: nizamial09

src/pybind/mgr/dashboard/frontend/src/app/shared/datatable/table/table.component.ts

@@ -383,6 +383,7 @@ export class TableComponent implements AfterViewInit, OnInit, OnChanges, OnDestr
     });
   }
   private previousRows = new Map<string | number, TableItem[]>();
+  private debouncedSearch = this.reloadData.bind(this);
 
   constructor(
     // private ngZone: NgZone,
@@ -539,7 +540,13 @@ export class TableComponent implements AfterViewInit, OnInit, OnChanges, OnDestr
     // debounce reloadData method so that search doesn't run api requests
     // for every keystroke
     if (this.serverSide) {
-      this.reloadData = _.debounce(this.reloadData, 1000);
+      this.reloadData = _.throttle(this.reloadData.bind(this), 1000, {
+        leading: true,
+        trailing: false
+      });
+      this.debouncedSearch = _.debounce(this.reloadData.bind(this), 1000);
+    } else {
+      this.debouncedSearch = this.reloadData.bind(this);
     }
 
     // ngx-datatable triggers calculations each time mouse enters a row,
@@ -883,7 +890,8 @@ export class TableComponent implements AfterViewInit, OnInit, OnChanges, OnDestr
       });
       context.pageInfo.offset = this.userConfig.offset;
       context.pageInfo.limit = this.userConfig.limit;
-      context.search = this.userConfig.search;
+      if (this.serverSide) context.search = this.search;
+      else context.search = this.userConfig.search;
       if (this.userConfig.sorts?.length) {
         const sort = this.userConfig.sorts[0];
         context.sort = `${sort.dir === 'desc' ? '-' : '+'}${sort.prop}`;
@@ -1239,7 +1247,7 @@ export class TableComponent implements AfterViewInit, OnInit, OnChanges, OnDestr
         this.userConfig.limit = this.limit;
         this.userConfig.search = this.search;
         this.updating = false;
-        this.reloadData();
+        this.debouncedSearch();
       }
       this.rows = this.data;
     } else {