[Datasource selector] Sort datasource option list alphabetically

CHANGELOG.md

@@ -30,6 +30,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Discover] Added customizable pagination options based on Discover UI settings [#5610](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5610)
 - [Chrome] Introduce registerCollapsibleNavHeader to allow plugins to customize the rendering of nav menu header ([#5244](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5244))
 - [Custom Branding] Relative URL should be allowed for logos ([#5572](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5572))
+- [Discover] Enhanced the data source selector with added sorting functionality ([#5609](https://github.com/opensearch-project/OpenSearch-Dashboards/issues/5609))
 
 ### 🐛 Bug Fixes
 

src/plugins/data/public/data_sources/datasource_selector/datasource_selectable.test.tsx

@@ -4,7 +4,7 @@
  */
 
 import React from 'react';
-import { render, act } from '@testing-library/react';
+import { render, act, screen, fireEvent } from '@testing-library/react';
 import { DataSourceSelectable } from './datasource_selectable';
 import { DataSourceType, GenericDataSource } from '../datasource_services';
 import { DataSourceGroup, DataSourceOption } from './types';
@@ -81,4 +81,104 @@ describe('DataSourceSelectable', () => {
 
     expect(onFetchDataSetErrorMock).toHaveBeenCalledWith(new Error('Fetch error'));
   });
+
+  it('should sort index patterns list alphabetically', async () => {
+    const mockDataSourceOptionList = [
+      {
+        label: 'Index patterns',
+        options: [
+          { label: 'logstash-*' },
+          { label: '000-*' },
+          { label: 'p000-1' },
+          { label: 'pattern_archive' },
+          { label: 'index_main' },
+          { label: 'index-2024' },
+        ],
+      },
+    ] as any;
+
+    render(
+      <DataSourceSelectable
+        dataSources={[
+          ({
+            getDataSet: jest.fn().mockResolvedValue([]),
+            getType: jest.fn().mockReturnValue('DEFAULT_INDEX_PATTERNS'),
+            getName: jest.fn().mockReturnValue('Index patterns'),
+          } as unknown) as DataSourceType,
+        ]}
+        dataSourceOptionList={mockDataSourceOptionList}
+        selectedSources={selectedSourcesMock}
+        onDataSourceSelect={setSelectedSourcesMock}
+        setDataSourceOptionList={setDataSourceOptionListMock}
+        onGetDataSetError={onFetchDataSetErrorMock}
+      />
+    );
+
+    const button = screen.getByLabelText('Open list of options');
+    fireEvent.click(button);
+    expect(
+      screen.getByTestId('comboBoxOptionsList dataExplorerDSSelect-optionsList')
+    ).toBeInTheDocument();
+    const defaultDSOptions = document.querySelectorAll('.euiComboBoxOption__content');
+    const optionTexts = Array.from(defaultDSOptions).map((option) => option.innerHTML);
+    const expectedIndexPatternSortedOrder = [
+      '000-*',
+      'index_main',
+      'index-2024',
+      'logstash-*',
+      'p000-1',
+      'pattern_archive',
+    ];
+    expect(optionTexts).toEqual(expectedIndexPatternSortedOrder);
+  });
+
+  it('should sort non index patterns list alphabetically', async () => {
+    const mockDataSourceOptionList = [
+      {
+        label: 'Amazon S3',
+        options: [
+          { label: 'mys3' },
+          { label: '*starred' },
+          { label: 'alpha-test-s3' },
+          { label: '@special' },
+          { label: 's3-2024' },
+          { label: 'S3_Archive' },
+        ],
+      },
+    ] as any;
+
+    render(
+      <DataSourceSelectable
+        dataSources={[
+          ({
+            getDataSet: jest.fn().mockResolvedValue([]),
+            getType: jest.fn().mockReturnValue('s3glue'),
+            getName: jest.fn().mockReturnValue('Amazon S3'),
+          } as unknown) as DataSourceType,
+        ]}
+        dataSourceOptionList={mockDataSourceOptionList}
+        selectedSources={selectedSourcesMock}
+        onDataSourceSelect={setSelectedSourcesMock}
+        setDataSourceOptionList={setDataSourceOptionListMock}
+        onGetDataSetError={onFetchDataSetErrorMock}
+      />
+    );
+
+    const button = screen.getByLabelText('Open list of options');
+    fireEvent.click(button);
+    expect(
+      screen.getByTestId('comboBoxOptionsList dataExplorerDSSelect-optionsList')
+    ).toBeInTheDocument();
+    const defaultDSOptions = document.querySelectorAll('.euiComboBoxOption__content');
+    const optionTexts = Array.from(defaultDSOptions).map((option) => option.innerHTML);
+    const expectedIndexPatternSortedOrder = [
+      '@special',
+      '*starred',
+      'alpha-test-s3',
+      'mys3',
+      'S3_Archive',
+      's3-2024',
+    ];
+    expect(optionTexts).toEqual(expectedIndexPatternSortedOrder);
+  });
 });

src/plugins/data/public/data_sources/datasource_selector/datasource_selectable.tsx

@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import React, { useEffect, useCallback } from 'react';
+import React, { useEffect, useCallback, useMemo } from 'react';
 import { EuiComboBox } from '@elastic/eui';
 import { i18n } from '@osd/i18n';
 import { ISourceDataSet, IndexPatternOption } from '../datasource';
@@ -118,13 +118,24 @@ export const DataSourceSelectable = ({
     [onDataSourceSelect]
   );
 
+  const memorizedDataSourceOptionList = useMemo(() => {
+    return dataSourceOptionList.map((dsGroup: DataSourceGroup) => {
+      return {
+        ...dsGroup,
+        options: [...dsGroup.options].sort((ds1, ds2) => {
+          return ds1.label.localeCompare(ds2.label, undefined, { sensitivity: 'base' });
+        }),
+      };
+    });
+  }, [dataSourceOptionList]);
+
   return (
     <EuiComboBox
       data-test-subj="dataExplorerDSSelect"
       placeholder={i18n.translate('data.datasource.selectADatasource', {
         defaultMessage: 'Select a datasource',
       })}
-      options={dataSourceOptionList as any}
+      options={memorizedDataSourceOptionList as any}
       selectedOptions={selectedSources as any}
       onChange={handleSourceChange}
       singleSelection={singleSelection}