TanStack · KevinVandy · Jun 29, 2024 · Jun 12, 2024 · Jun 12, 2024 · Jun 12, 2024
diff --git a/docs/config.json b/docs/config.json
@@ -463,6 +463,10 @@
             {
               "to": "framework/lit/examples/sorting",
               "label": "Sorting"
+            },
+            {
+              "to": "framework/lit/examples/virtualized-rows",
+              "label": "Virtualized Rows"
             }
           ]
         },

diff --git a/examples/lit/virtualized-rows/.gitignore b/examples/lit/virtualized-rows/.gitignore
@@ -0,0 +1,5 @@
+node_modules
+.DS_Store
+dist
+dist-ssr
+*.local
diff --git a/examples/lit/virtualized-rows/README.md b/examples/lit/virtualized-rows/README.md
@@ -0,0 +1,6 @@
+# Example
+
+To run this example:
+
+- `npm install` or `yarn`
+- `npm run start` or `yarn start`
diff --git a/examples/lit/virtualized-rows/index.html b/examples/lit/virtualized-rows/index.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Vite App</title>
+    <script type="module" src="https://cdn.skypack.dev/twind/shim"></script>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.ts"></script>
+    <lit-table-example></lit-table-example>
+  </body>
+</html>
diff --git a/examples/lit/virtualized-rows/package.json b/examples/lit/virtualized-rows/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "tanstack-lit-table-virtualized-rows",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "serve": "vite preview",
+    "start": "vite"
+  },
+  "dependencies": {
+    "@faker-js/faker": "^8.4.1",
+    "@lit-labs/virtualizer": "^2.0.13",
+    "@tanstack/lit-table": "^8.19.1",
+    "lit": "^3.1.3"
+  },
+  "devDependencies": {
+    "@rollup/plugin-replace": "^5.0.5",
+    "typescript": "5.4.5",
+    "vite": "^5.2.10"
+  }
+}
diff --git a/examples/lit/virtualized-rows/src/main.ts b/examples/lit/virtualized-rows/src/main.ts
@@ -0,0 +1,211 @@
+import { customElement } from 'lit/decorators.js'
+import { html, LitElement } from 'lit'
+import { repeat } from 'lit/directives/repeat.js'
+import {
+  ColumnDef,
+  flexRender,
+  getCoreRowModel,
+  getSortedRowModel,
+  TableController,
+} from '@tanstack/lit-table'
+import config from '../twind.config'
+import { styleMap } from 'lit/directives/style-map.js'
+import { virtualize, virtualizerRef } from '@lit-labs/virtualizer/virtualize.js'
+import { makeData, Person } from './makeData.ts'
+
+const columns: ColumnDef<Person>[] = [
+  {
+    accessorKey: 'id',
+    header: 'ID',
+    size: 60,
+  },
+  {
+    accessorKey: 'firstName',
+    cell: info => info.getValue(),
+  },
+  {
+    accessorFn: row => row.lastName,
+    id: 'lastName',
+    cell: info => info.getValue(),
+    header: () => html`<span>Last Name</span>`,
+  },
+  {
+    accessorKey: 'age',
+    header: () => 'Age',
+    size: 50,
+  },
+  {
+    accessorKey: 'visits',
+    header: () => html`<span>Visits</span>`,
+    size: 50,
+  },
+  {
+    accessorKey: 'status',
+    header: 'Status',
+  },
+  {
+    accessorKey: 'progress',
+    header: 'Profile Progress',
+    size: 80,
+  },
+  {
+    accessorKey: 'createdAt',
+    header: 'Created At',
+    cell: info => info.getValue<Date>().toLocaleString(),
+    size: 250,
+  },
+]
+const data = makeData(50_000)
+
+@customElement('lit-table-example')
+class LitTableExample extends LitElement {
+  private tableController = new TableController<Person>(this)
+
+  protected render(): unknown {
+    const table = this.tableController.table({
+      columns,
+      data,
+      getSortedRowModel: getSortedRowModel(),
+      getCoreRowModel: getCoreRowModel(),
+    })
+    const { rows } = table.getRowModel()
+    return html`
+      <div class="app">
+        (${data.length} rows)
+        <div
+          class="container"
+          style="${styleMap({
+            overflow: 'auto', //our scrollable table container
+            position: 'relative', //needed for sticky header
+            height: '800px', //should be a fixed height
+          })}"
+        >
+          <table style="display: grid">
+            <thead
+              style="${styleMap({
+                display: 'grid',
+                position: 'sticky',
+                top: 0,
+                zIndex: 1,
+              })}"
+            >
+              ${repeat(
+                table.getHeaderGroups(),
+                headerGroup => headerGroup.id,
+                headerGroup => html`
+                  <tr style="${styleMap({ display: 'flex', width: '100%' })}">
+                    ${repeat(
+                      headerGroup.headers,
+                      header => header.id,
+                      header => html`
+                        <th
+                          style="${styleMap({
+                            display: 'flex',
+                            width: `${header.getSize()}px`,
+                          })}"
+                          @click="${header.column.getToggleSortingHandler()}"
+                        >
+                          ${flexRender(
+                            header.column.columnDef.header,
+                            header.getContext()
+                          )}
+                          ${{ asc: ' 🔼', desc: ' 🔽' }[
+                            header.column.getIsSorted() as string
+                          ] ?? null}
+                        </th>
+                      `
+                    )}
+                  </tr>
+                `
+              )}
+            </thead>
+            <tbody
+              style=${styleMap({
+                display: 'grid',
+                height: 500,
+                // height: `${rowVirtualizer.getTotalSize()}px`, //tells scrollbar how big the table is
+                position: 'relative', //needed for absolute positioning of rows
+              })}
+            >
+              ${virtualize({
+                items: data,
+                renderItem: (_, index) => {
+                  const row = rows[index]
+                  return html`
+                    <tr
+                      style=${styleMap({
+                        display: 'flex',
+                        width: '100%',
+                      })}
+                    >
+                      ${repeat(
+                        row.getVisibleCells(),
+                        cell => cell.id,
+                        cell => html`
+                          <td
+                            style=${styleMap({
+                              display: 'flex',
+                              width: `${cell.column.getSize()}px`,
+                            })}
+                          >
+                            ${flexRender(
+                              cell.column.columnDef.cell,
+                              cell.getContext()
+                            )}
+                          </td>
+                        `
+                      )}
+                    </tr>
+                  `
+                },
+              })}
+            </tbody>
+          </table>
+        </div>
+      </div>
+
+      <style>
+        html {
+          font-family: sans-serif;
+          font-size: 14px;
+        }
+
+        table {
+          border-collapse: collapse;
+          border-spacing: 0;
+          font-family: arial, sans-serif;
+          table-layout: fixed;
+        }
+
+        thead {
+          background: lightgray;
+        }
+
+        tr {
+          border-bottom: 1px solid lightgray;
+        }
+
+        th {
+          border-bottom: 1px solid lightgray;
+          border-right: 1px solid lightgray;
+          padding: 2px 4px;
+          text-align: left;
+        }
+
+        td {
+          padding: 6px;
+        }
+
+        .container {
+          border: 1px solid lightgray;
+          margin: 1rem auto;
+        }
+
+        .app {
+          margin: 1rem auto;
+          text-align: center;
+        }
+      </style>
+    `
+  }
+}
diff --git a/examples/lit/virtualized-rows/src/makeData.ts b/examples/lit/virtualized-rows/src/makeData.ts
@@ -0,0 +1,50 @@
+import { faker } from '@faker-js/faker'
+
+export type Person = {
+  id: number
+  firstName: string
+  lastName: string
+  age: number
+  visits: number
+  progress: number
+  status: 'relationship' | 'complicated' | 'single'
+  createdAt: Date
+}
+
+const range = (len: number) => {
+  const arr: number[] = []
+  for (let i = 0; i < len; i++) {
+    arr.push(i)
+  }
+  return arr
+}
+
+const newPerson = (index: number): Person => {
+  return {
+    id: index + 1,
+    firstName: faker.person.firstName(),
+    lastName: faker.person.lastName(),
+    age: faker.number.int(40),
+    visits: faker.number.int(1000),
+    progress: faker.number.int(100),
+    createdAt: faker.date.anytime(),
+    status: faker.helpers.shuffle<Person['status']>([
+      'relationship',
+      'complicated',
+      'single',
+    ])[0]!,
+  }
+}
+
+export function makeData(...lens: number[]) {
+  const makeDataLevel = (depth = 0): Person[] => {
+    const len = lens[depth]!
+    return range(len).map((d): Person => {
+      return {
+        ...newPerson(d),
+      }
+    })
+  }
+
+  return makeDataLevel()
+}
diff --git a/examples/lit/virtualized-rows/tsconfig.json b/examples/lit/virtualized-rows/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "emitDecoratorMetadata": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "experimentalDecorators": true,
+    "useDefineForClassFields": false,
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"]
+}
diff --git a/examples/lit/virtualized-rows/twind.config.ts b/examples/lit/virtualized-rows/twind.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from '@twind/core'
+import presetAutoprefix from '@twind/preset-autoprefix'
+import presetTailwind from '@twind/preset-tailwind/base'
+
+export default defineConfig({
+  presets: [presetAutoprefix(), presetTailwind()],
+})
diff --git a/examples/lit/virtualized-rows/vite.config.js b/examples/lit/virtualized-rows/vite.config.js
@@ -0,0 +1,15 @@
+import { defineConfig } from 'vite'
+import rollupReplace from '@rollup/plugin-replace'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [
+    rollupReplace({
+      preventAssignment: true,
+      values: {
+        __DEV__: JSON.stringify(true),
+        'process.env.NODE_ENV': JSON.stringify('development'),
+      },
+    }),
+  ],
+})