[vtadmin-web] Add DataTable component with URL pagination

web/vtadmin/package.json

@@ -7,8 +7,6 @@
     "npm": ">=6.14.9"
   },
   "dependencies": {
-    "@testing-library/jest-dom": "^5.11.6",
-    "@testing-library/react": "^11.2.2",
     "@testing-library/user-event": "^12.6.0",
     "@types/classnames": "^2.2.11",
     "@types/jest": "^26.0.19",
@@ -17,8 +15,10 @@
     "@types/react-dom": "^16.9.10",
     "@types/react-router-dom": "^5.1.7",
     "classnames": "^2.2.6",
+    "history": "^5.0.0",
     "lodash-es": "^4.17.20",
     "node-sass": "^4.14.1",
+    "query-string": "^6.14.0",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-query": "^3.5.9",
@@ -60,6 +60,9 @@
     ]
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^5.11.9",
+    "@testing-library/react": "^11.2.5",
+    "@testing-library/react-hooks": "^5.0.3",
     "@types/lodash-es": "^4.17.4",
     "msw": "^0.24.4",
     "prettier": "^2.2.1",

web/vtadmin/src/components/dataTable/DataTable.tsx

@@ -0,0 +1,75 @@
+/**
+ * Copyright 2021 The Vitess Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import qs from 'query-string';
+import * as React from 'react';
+import { useLocation } from 'react-router-dom';
+
+import { useURLPagination } from '../../hooks/useURLPagination';
+import { useURLQuery } from '../../hooks/useURLQuery';
+import { PaginationNav } from './PaginationNav';
+
+interface Props<T> {
+    columns: string[];
+    data: T[];
+    pageSize?: number;
+    renderRows: (rows: T[]) => JSX.Element[];
+}
+
+// Generally, page sizes of ~100 rows are fine in terms of performance,
+// but anything over ~50 feels unwieldy in terms of UX.
+const DEFAULT_PAGE_SIZE = 50;
+
+export const DataTable = <T extends object>({ columns, data, pageSize = DEFAULT_PAGE_SIZE, renderRows }: Props<T>) => {
+    const { pathname } = useLocation();
+    const urlQuery = useURLQuery();
+
+    const totalPages = Math.ceil(data.length / pageSize);
+    const { page } = useURLPagination({ totalPages });
+
+    const startIndex = (page - 1) * pageSize;
+    const endIndex = startIndex + pageSize;
+    const dataPage = data.slice(startIndex, endIndex);
+
+    const startRow = startIndex + 1;
+    const lastRow = Math.min(data.length, startIndex + pageSize);
+
+    const formatPageLink = (p: number) => ({
+        pathname,
+        search: qs.stringify({ ...urlQuery, page: p === 1 ? undefined : p }),
+    });
+
+    return (
+        <div>
+            <table>
+                <thead>
+                    <tr>
+                        {columns.map((col, cdx) => (
+                            <th key={cdx}>{col}</th>
+                        ))}
+                    </tr>
+                </thead>
+                <tbody>{renderRows(dataPage)}</tbody>
+            </table>
+
+            <PaginationNav currentPage={page} formatLink={formatPageLink} totalPages={totalPages} />
+            {!!data.length && (
+                <p className="text-color-secondary">
+                    Showing {startRow} {lastRow > startRow ? `- ${lastRow}` : null} of {data.length}
+                </p>
+            )}
+        </div>
+    );
+};

web/vtadmin/src/components/dataTable/PaginationNav.module.scss

@@ -0,0 +1,51 @@
+/**
+ * Copyright 2021 The Vitess Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+.links {
+  display: flex;
+  list-style-type: none;
+  margin: 0;
+  padding: 0;
+}
+
+.placeholder,
+a.link {
+  border: solid 1px var(--backgroundPrimaryHighlight);
+  border-radius: 6px;
+  color: var(--textColorSecondary);
+  display: block;
+  line-height: 36px;
+  margin-right: 8px;
+  text-align: center;
+  width: 36px;
+}
+
+a.link {
+  cursor: pointer;
+  text-decoration: none;
+
+  &:hover {
+    border-color: var(--colorPrimary);
+  }
+
+  &.activeLink {
+    border-color: var(--colorPrimary);
+    color: var(--colorPrimary);
+  }
+}
+
+.placeholder::before {
+  content: '...';
+}

web/vtadmin/src/components/dataTable/PaginationNav.test.tsx

@@ -0,0 +1,99 @@
+/**
+ * Copyright 2021 The Vitess Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { render, screen, within } from '@testing-library/react';
+import { MemoryRouter } from 'react-router-dom';
+import { PaginationNav, Props } from './PaginationNav';
+
+const formatLink = (page: number) => ({
+    pathname: '/test',
+    search: `?hello=world&page=${page}`,
+});
+
+describe('PaginationNav', () => {
+    const tests: {
+        name: string;
+        props: Props;
+        expected: null | Array<number | null>;
+    }[] = [
+        {
+            name: 'renders without breaks',
+            props: { currentPage: 1, formatLink, maxVisible: 3, totalPages: 2 },
+            expected: [1, 2],
+        },
+        {
+            name: 'renders breaks on the right',
+            props: { currentPage: 1, formatLink, maxVisible: 5, totalPages: 11 },
+            expected: [1, 2, 3, null, 11],
+        },
+        {
+            name: 'renders breaks on the left',
+            props: { currentPage: 11, formatLink, maxVisible: 5, totalPages: 11 },
+            expected: [1, null, 9, 10, 11],
+        },
+        {
+            name: 'renders breaks in the middle',
+            props: { currentPage: 6, formatLink, maxVisible: 5, totalPages: 11 },
+            expected: [1, null, 6, null, 11],
+        },
+        {
+            name: 'renders widths according to the minWidth prop',
+            props: { currentPage: 6, formatLink, maxVisible: 9, minWidth: 2, totalPages: 100 },
+            expected: [1, 2, null, 5, 6, 7, null, 99, 100],
+        },
+        {
+            name: 'does not render if totalPages == 0',
+            props: { currentPage: 1, formatLink, totalPages: 0 },
+            expected: null,
+        },
+        {
+            name: 'renders even if page > totalPages',
+            props: { currentPage: 100000, formatLink, maxVisible: 5, totalPages: 11 },
+            expected: [1, null, 9, 10, 11],
+        },
+    ];
+
+    test.each(tests.map(Object.values))('%s', (name: string, props: Props, expected: Array<number | null>) => {
+        render(<PaginationNav {...props} />, { wrapper: MemoryRouter });
+
+        const nav = screen.queryByRole('navigation');
+        if (expected === null) {
+            expect(nav).toBeNull();
+            return;
+        }
+
+        const lis = screen.getAllByRole('listitem');
+        expect(lis).toHaveLength(expected.length);
+
+        lis.forEach((li, idx) => {
+            const e = expected[idx];
+            const link = within(li).queryByRole('link');
+
+            if (e === null) {
+                // Placeholders don't render links
+                expect(link).toBeNull();
+            } else {
+                expect(link).toHaveAttribute('href', `/test?hello=world&page=${e}`);
+                expect(link).toHaveTextContent(`${e}`);
+
+                if (e === props.currentPage) {
+                    expect(link).toHaveClass('activeLink');
+                } else {
+                    expect(link).not.toHaveClass('activeLink');
+                }
+            }
+        });
+    });
+});

web/vtadmin/src/components/dataTable/PaginationNav.tsx

@@ -0,0 +1,119 @@
+/**
+ * Copyright 2021 The Vitess Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import cx from 'classnames';
+import * as React from 'react';
+import { Link, LinkProps } from 'react-router-dom';
+
+import style from './PaginationNav.module.scss';
+
+export interface Props {
+    currentPage: number;
+    formatLink: (page: number) => LinkProps['to'];
+    // The maximum number of pagination elements to show. Note that this includes any placeholders.
+    // It's recommended for this value to be >= 5 to handle the case where there are
+    // breaks on either side of the list.
+    maxVisible?: number;
+    // The minimum number of pagination elements to show at the beginning/end of a sequence,
+    // adjacent to any sequence breaks.
+    minWidth?: number;
+    // The total number of pages
+    totalPages: number;
+}
+
+const DEFAULT_MAX_VISIBLE = 8;
+const DEFAULT_MIN_WIDTH = 1;
+
+// This assumes we always want to 1-index our pages, where "page 1" is the first page.
+// If we find a need for zero-indexed pagination, we can make this configurable.
+const FIRST_PAGE = 1;
+
+// PageSpecifiers with a numeric value are links. `null` is used
+// to signify a break in the sequence.
+type PageSpecifier = number | null;
+
+export const PaginationNav = ({
+    currentPage,
+    formatLink,
+    maxVisible = DEFAULT_MAX_VISIBLE,
+    minWidth = DEFAULT_MIN_WIDTH,
+    totalPages,
+}: Props) => {
+    if (totalPages <= 1) {
+        return null;
+    }
+
+    // This rather magical solution is borrowed, with gratitude, from StackOverflow
+    // https://stackoverflow.com/a/46385144
+    const leftWidth = (maxVisible - minWidth * 2 - 3) >> 1;
+    const rightWidth = (maxVisible - minWidth * 2 - 2) >> 1;
+
+    let numbers: PageSpecifier[] = [];
+    if (totalPages <= maxVisible) {
+        // No breaks in list
+        numbers = range(FIRST_PAGE, totalPages);
+    } else if (currentPage <= maxVisible - minWidth - 1 - rightWidth) {
+        // No break on left side of page
+        numbers = range(FIRST_PAGE, maxVisible - minWidth - 1).concat(
+            null,
+            range(totalPages - minWidth + 1, totalPages)
+        );
+    } else if (currentPage >= totalPages - minWidth - 1 - rightWidth) {
+        // No break on right of page
+        numbers = range(FIRST_PAGE, minWidth).concat(
+            null,
+            range(totalPages - minWidth - 1 - rightWidth - leftWidth, totalPages)
+        );
+    } else {
+        // Breaks on both sides
+        numbers = range(FIRST_PAGE, minWidth).concat(
+            null,
+            range(currentPage - leftWidth, currentPage + rightWidth),
+            null,
+            range(totalPages - minWidth + 1, totalPages)
+        );
+    }
+
+    return (
+        <nav>
+            <ul className={style.links}>
+                {numbers.map((num: number | null, idx) =>
+                    num === null ? (
+                        <li key={`placeholder-${idx}`}>
+                            <div className={style.placeholder} />
+                        </li>
+                    ) : (
+                        <li key={num}>
+                            <Link
+                                className={cx(style.link, { [style.activeLink]: num === currentPage })}
+                                to={formatLink(num)}
+                            >
+                                {num}
+                            </Link>
+                        </li>
+                    )
+                )}
+            </ul>
+        </nav>
+    );
+};
+
+// lodash-es has a `range` function but it doesn't play nice
+// with the PageSpecifier[] return type (since it's a mixed array
+// of numbers and nulls).
+const range = (start: number, end: number): PageSpecifier[] => {
+    if (isNaN(start) || isNaN(end)) return [];
+    return Array.from(Array(end - start + 1), (_, i) => i + start);
+};