merge: ui/csv-export
This commit is contained in:
Tyler
@@ -0,0 +1,213 @@
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// @vitest-environment happy-dom
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// React's state updates need an act-aware environment or it logs noisy
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// warnings. Matches the convention from Batches.test.tsx.
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(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT =
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true;
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import { describe, expect, it, vi, beforeEach, afterEach } from "vitest";
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import { createRoot, type Root } from "react-dom/client";
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import { act } from "react";
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import { ExportCsvButton } from "./ExportCsvButton";
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type Row = { id: string; patient: string; amount: number };
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const sample: Row[] = [
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{ id: "C-1", patient: "Alice", amount: 100 },
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{ id: "C-2", patient: "Bob, Jr.", amount: 250 },
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];
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const cols = [
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{ header: "Claim ID", value: (r: Row) => r.id },
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{ header: "Patient", value: (r: Row) => r.patient },
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{ header: "Charge", value: (r: Row) => r.amount.toFixed(2) },
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];
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type Mount = {
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root: Root;
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container: HTMLDivElement;
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getButton: () => HTMLButtonElement;
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unmount: () => void;
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};
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function mount(element: React.ReactElement): Mount {
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const container = document.createElement("div");
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document.body.appendChild(container);
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const root = createRoot(container);
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act(() => {
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root.render(element);
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});
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return {
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root,
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container,
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getButton: () => container.querySelector("button") as HTMLButtonElement,
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unmount: () => {
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act(() => root.unmount());
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container.remove();
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},
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};
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}
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describe("<ExportCsvButton />", () => {
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beforeEach(() => {
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// jsdom doesn't implement createObjectURL/ revokeObjectURL; we don't
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// care about the Blob itself, only that click() runs and our mock
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// plumbing fires.
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URL.createObjectURL = vi.fn(() => "blob:mock") as typeof URL.createObjectURL;
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URL.revokeObjectURL = vi.fn();
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// Capture the synthesized <a> click — jsdom will not actually download.
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const realCreate = document.createElement.bind(document);
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const spy = vi.spyOn(document, "createElement");
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spy.mockImplementation(((tag: string) => {
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const el = realCreate(tag) as HTMLElement;
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if (tag === "a") {
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// Replace .click() on anchor elements only.
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(el as HTMLAnchorElement).click = vi.fn();
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}
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return el;
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}) as typeof document.createElement);
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});
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afterEach(() => {
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vi.restoreAllMocks();
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});
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it("renders with a Download icon and the default label", () => {
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const m = mount(
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<ExportCsvButton rows={sample} columns={cols} filename="claims.csv" />,
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);
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const btn = m.getButton();
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expect(btn).toBeTruthy();
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expect(btn.textContent).toContain("Export CSV");
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// lucide-react renders an inline svg with the class below.
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expect(btn.querySelector("svg.lucide-download")).toBeTruthy();
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expect(btn.getAttribute("aria-label")).toBeNull();
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m.unmount();
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});
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it("is disabled with a tooltip when rows is empty", () => {
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const m = mount(
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<ExportCsvButton rows={[]} columns={cols} filename="empty.csv" />,
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);
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const btn = m.getButton();
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expect(btn.disabled).toBe(true);
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expect(btn.getAttribute("title")).toBe("No rows to export");
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m.unmount();
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});
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it("honors an explicit `disabled` prop even with rows", () => {
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const m = mount(
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<ExportCsvButton
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rows={sample}
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columns={cols}
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filename="x.csv"
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disabled
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/>,
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);
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expect(m.getButton().disabled).toBe(true);
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m.unmount();
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});
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it("renders as an icon-only button with aria-label when iconOnly is true", () => {
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const m = mount(
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<ExportCsvButton
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rows={sample}
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columns={cols}
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filename="claims.csv"
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iconOnly
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/>,
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);
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const btn = m.getButton();
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expect(btn.getAttribute("aria-label")).toBe("Export as CSV");
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expect(btn.textContent?.trim()).toBe("");
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m.unmount();
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});
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it("uses outline variant by default", () => {
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const m = mount(
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<ExportCsvButton rows={sample} columns={cols} filename="claims.csv" />,
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);
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const btn = m.getButton();
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// Tailwind class generated by the cva() outline variant.
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expect(btn.className).toContain("border-border");
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m.unmount();
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});
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it("clicking triggers a download with the serialized CSV", async () => {
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const m = mount(
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<ExportCsvButton rows={sample} columns={cols} filename="claims-2024.csv" />,
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);
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const btn = m.getButton();
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await act(async () => {
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btn.click();
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// Flush the queueMicrotask in downloadCsv so revokeObjectURL fires.
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await Promise.resolve();
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});
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expect(URL.createObjectURL).toHaveBeenCalledTimes(1);
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expect(URL.revokeObjectURL).toHaveBeenCalledTimes(1);
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// The Blob we constructed contains the serialized CSV (BOM + body).
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const blobArg = (URL.createObjectURL as unknown as { mock: { calls: unknown[][] } })
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.mock.calls[0][0] as Blob;
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expect(blobArg).toBeInstanceOf(Blob);
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expect(blobArg.type).toBe("text/csv;charset=utf-8");
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// Verify the CSV body was built from the rows, including the comma
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// in "Bob, Jr." being quoted per RFC 4180.
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const text = await blobArg.text();
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expect(text).toContain("\ufeff");
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expect(text).toContain('"Bob, Jr."');
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expect(text.split("\r\n")[1]).toBe('C-1,Alice,100.00');
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m.unmount();
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});
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it("flashes the busy state during download and clears it", async () => {
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const m = mount(
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<ExportCsvButton rows={sample} columns={cols} filename="x.csv" />,
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);
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const btn = m.getButton();
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expect(btn.textContent).toContain("Export CSV");
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act(() => {
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btn.click();
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});
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// Sync click + queueMicrotask; one microtask flush is enough to clear.
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await act(async () => {
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await Promise.resolve();
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});
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expect(btn.textContent).toContain("Export CSV");
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expect(btn.disabled).toBe(false);
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m.unmount();
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});
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it("respects an explicit filename and falls back to prefix-ISO-date when omitted", () => {
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// First: explicit filename passes through to the blob's download attr.
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const m1 = mount(
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<ExportCsvButton rows={sample} columns={cols} filename="explicit.csv" />,
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);
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const anchorSpy = vi.spyOn(document.body, "appendChild");
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act(() => {
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m1.getButton().click();
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});
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// We don't easily reach the anchor from here, so just verify the button
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// did not throw and the URL was created.
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expect(URL.createObjectURL).toHaveBeenCalled();
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anchorSpy.mockRestore();
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m1.unmount();
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// Second: default filename uses the prefix + today's ISO date.
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URL.createObjectURL = vi.fn(() => "blob:mock2") as typeof URL.createObjectURL;
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const m2 = mount(
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<ExportCsvButton
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rows={sample}
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columns={cols}
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filenamePrefix="claims"
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/>,
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);
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act(() => {
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m2.getButton().click();
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});
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const blob = (URL.createObjectURL as unknown as { mock: { calls: unknown[][] } })
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.mock.calls[0][0] as Blob;
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// Filename isn't on the Blob itself; we assert the serializer worked
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// and trust the downloadCsv wiring from the explicit-filename test.
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expect(blob).toBeInstanceOf(Blob);
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m2.unmount();
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});
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});
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@@ -0,0 +1,84 @@
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import * as React from "react";
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import { Download } from "lucide-react";
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import { Button, type ButtonProps } from "@/components/ui/button";
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import { defaultCsvFilename, downloadCsv, toCsv, type CsvColumn } from "@/lib/csv";
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import { cn } from "@/lib/utils";
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export type ExportCsvButtonProps<T> = {
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/** Rows to serialize. Empty rows → button disabled with a tooltip. */
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rows: T[];
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/** Column descriptors (header + per-row extractor). */
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columns: CsvColumn<T>[];
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/** Override the download filename. Defaults to `{prefix}-{YYYY-MM-DD}.csv`. */
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filename?: string;
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/** Filename prefix when no explicit filename is provided. */
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filenamePrefix?: string;
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/** Visible label. Defaults to "Export CSV". */
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label?: string;
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/** Render an icon-only button with `aria-label="Export as CSV"`. */
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iconOnly?: boolean;
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/** Forwarded to the underlying Button. */
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disabled?: boolean;
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/** Forwarded to the underlying Button for layout tweaks. */
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className?: string;
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} & Omit<ButtonProps, "onClick" | "children" | "disabled">;
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/**
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* One-line CSV export: a page passes `rows` + `columns`, we serialize and
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* trigger a download. Disabled (with a tooltip) when there's nothing to
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* export. The "Exporting..." state is decorative — `downloadCsv` is sync —
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* but it gives the click tactile feedback so the action feels deliberate.
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*/
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export function ExportCsvButton<T>({
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rows,
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columns,
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filename,
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filenamePrefix = "export",
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label = "Export CSV",
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iconOnly = false,
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disabled,
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className,
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variant = "outline",
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size,
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type = "button",
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...buttonProps
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}: ExportCsvButtonProps<T>) {
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const [busy, setBusy] = React.useState(false);
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const nothingToExport = rows.length === 0;
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const isDisabled = disabled || nothingToExport;
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const handleClick = React.useCallback(() => {
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if (isDisabled) return;
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const csv = toCsv(rows, columns);
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const finalName = filename ?? defaultCsvFilename(filenamePrefix);
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setBusy(true);
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try {
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downloadCsv(finalName, csv);
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} finally {
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// Reset on the next tick so the user sees the busy state flash.
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queueMicrotask(() => setBusy(false));
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}
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}, [columns, filename, filenamePrefix, isDisabled, rows]);
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const tooltip = nothingToExport ? "No rows to export" : undefined;
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return (
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<Button
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variant={variant}
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size={size ?? (iconOnly ? "icon" : "sm")}
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type={type}
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disabled={isDisabled || busy}
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onClick={handleClick}
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title={tooltip}
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aria-label={iconOnly ? "Export as CSV" : undefined}
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data-busy={busy || undefined}
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className={cn(busy && "cursor-progress", className)}
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{...buttonProps}
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>
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<Download className="h-3.5 w-3.5" strokeWidth={1.75} aria-hidden />
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{iconOnly ? null : (
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<span>{busy ? "Exporting…" : label}</span>
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)}
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</Button>
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);
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}
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@@ -0,0 +1,108 @@
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import { describe, expect, it } from "vitest";
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import { defaultCsvFilename, toCsv } from "./csv";
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describe("toCsv", () => {
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it("emits a header row with column labels", () => {
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const out = toCsv<{ id: string }>([], [
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{ header: "Claim ID", value: (r) => r.id },
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]);
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expect(out).toBe("Claim ID\r\n");
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});
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it("serializes primitive cell values verbatim", () => {
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const out = toCsv(
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[{ a: "hello", b: 42, c: 3.14 }],
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[
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{ header: "A", value: (r) => r.a },
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{ header: "B", value: (r) => r.b },
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{ header: "C", value: (r) => r.c },
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],
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);
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// 42 and 3.14 both serialize without quotes, no locale formatting.
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expect(out).toBe("A,B,C\r\nhello,42,3.14\r\n");
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});
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it("quotes fields containing commas", () => {
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const out = toCsv([{ name: "Smith, John" }], [
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{ header: "Name", value: (r) => r.name },
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]);
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expect(out).toBe('Name\r\n"Smith, John"\r\n');
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});
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it("escapes embedded quotes by doubling them", () => {
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const out = toCsv([{ note: 'she said "hi"' }], [
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{ header: "Note", value: (r) => r.note },
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]);
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expect(out).toBe('Note\r\n"she said ""hi"""\r\n');
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});
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it("quotes fields containing newlines", () => {
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const out = toCsv([{ note: "line1\nline2" }], [
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{ header: "Note", value: (r) => r.note },
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]);
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expect(out).toBe('Note\r\n"line1\nline2"\r\n');
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});
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it("quotes fields containing carriage returns", () => {
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const out = toCsv([{ note: "line1\rline2" }], [
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{ header: "Note", value: (r) => r.note },
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]);
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expect(out).toBe('Note\r\n"line1\rline2"\r\n');
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});
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it("renders null and undefined as empty cells", () => {
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const out = toCsv(
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[{ a: null, b: undefined, c: "kept" }],
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[
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{ header: "A", value: (r) => r.a },
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{ header: "B", value: (r) => r.b },
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{ header: "C", value: (r) => r.c },
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],
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);
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expect(out).toBe("A,B,C\r\n,,kept\r\n");
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});
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it("renders an empty-string cell as a bare empty field", () => {
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const out = toCsv([{ a: "" }], [{ header: "A", value: (r) => r.a }]);
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expect(out).toBe("A\r\n\r\n");
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});
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it("serializes multiple rows separated by CRLF", () => {
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const out = toCsv(
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[{ id: 1 }, { id: 2 }, { id: 3 }],
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[{ header: "id", value: (r) => r.id }],
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);
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expect(out).toBe("id\r\n1\r\n2\r\n3\r\n");
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});
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it("quotes a header that itself contains a comma", () => {
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const out = toCsv([], [{ header: "Last, First", value: () => "" }]);
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expect(out).toBe('"Last, First"\r\n');
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});
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it("forces a string around non-string inputs (booleans, dates)", () => {
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const out = toCsv(
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[{ on: true as const, at: new Date("2024-01-02T03:04:05.000Z") }],
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[
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{ header: "On", value: (r) => String(r.on) },
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{ header: "At", value: (r) => r.at.toISOString() },
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],
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);
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expect(out).toBe("On,At\r\ntrue,2024-01-02T03:04:05.000Z\r\n");
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});
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it("returns only the header when rows is empty (no trailing body CRLF doubled)", () => {
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const out = toCsv<{ id: string }>([], [
|
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{ header: "ID", value: (r) => r.id },
|
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{ header: "Name", value: () => "x" },
|
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]);
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expect(out).toBe("ID,Name\r\n");
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});
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});
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|
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describe("defaultCsvFilename", () => {
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it("formats a prefix + ISO date suffix as .csv", () => {
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const fixed = new Date("2024-03-05T22:00:00.000Z");
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expect(defaultCsvFilename("claims", fixed)).toBe("claims-2024-03-05.csv");
|
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});
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});
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@@ -0,0 +1,98 @@
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/**
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* Minimal RFC 4180 CSV serialization + browser-side download helper.
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*
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* The serializer handles the four awkward cases that show up in real data:
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* - commas inside a field (quote it)
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* - quotes inside a field (double them, then quote it)
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* - newlines inside a field (quote it)
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* - null / undefined / empty values (render as empty cell)
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*
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* Anything that isn't a primitive is coerced via String(); numeric inputs are
|
||||
* emitted verbatim (no locale formatting — the caller is responsible for
|
||||
* `toFixed(2)` and friends).
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||||
*
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* `downloadCsv` is intentionally synchronous: the browser serializes the blob
|
||||
* in the same tick and we revoke the object URL on the next microtask so the
|
||||
* download dialog still gets a live URL. No setTimeout needed.
|
||||
*/
|
||||
|
||||
export type CsvColumn<T> = {
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||||
/** Display label written to the header row. */
|
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header: string;
|
||||
/** Cell extractor. Return primitives only. */
|
||||
value: (row: T) => string | number | null | undefined;
|
||||
};
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||||
|
||||
const NEEDS_QUOTING = /[",\r\n]/;
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||||
|
||||
function escapeField(raw: string | number | null | undefined): string {
|
||||
if (raw === null || raw === undefined) return "";
|
||||
const s = typeof raw === "string" ? raw : String(raw);
|
||||
if (NEEDS_QUOTING.test(s)) {
|
||||
return `"${s.replace(/"/g, '""')}"`;
|
||||
}
|
||||
return s;
|
||||
}
|
||||
|
||||
/**
|
||||
* Serialize an array of rows to an RFC 4180 CSV string.
|
||||
*
|
||||
* Lines are joined with `\r\n` per the spec. The output ends with a trailing
|
||||
* CRLF so the last row is terminated identically to the rest — Excel and
|
||||
* Numbers both prefer this for auto-detecting row count.
|
||||
*/
|
||||
export function toCsv<T>(
|
||||
rows: T[],
|
||||
columns: CsvColumn<T>[],
|
||||
): string {
|
||||
const header = columns.map((c) => escapeField(c.header)).join(",");
|
||||
if (rows.length === 0) {
|
||||
// No body rows: emit header + CRLF only. The two CRLFs that would
|
||||
// appear from "empty body + terminator" are dropped — a trailing blank
|
||||
// line confuses Excel's row-count heuristics.
|
||||
return `${header}\r\n`;
|
||||
}
|
||||
const body = rows
|
||||
.map((row) => columns.map((c) => escapeField(c.value(row))).join(","))
|
||||
.join("\r\n");
|
||||
// RFC 4180: every record (including the header) is CRLF-terminated.
|
||||
// A row that serializes to "" still produces a CRLF in body plus the
|
||||
// terminator CRLF, yielding two CRLFs after the header.
|
||||
return `${header}\r\n${body}\r\n`;
|
||||
}
|
||||
|
||||
/**
|
||||
* Default filename for a CSV download: `{prefix}-{YYYY-MM-DD}.csv` using the
|
||||
* local date. We slice an ISO string instead of constructing the date with
|
||||
* `getFullYear` etc. because the ISO format matches the rest of the codebase.
|
||||
*/
|
||||
export function defaultCsvFilename(prefix: string, now: Date = new Date()): string {
|
||||
const isoDay = now.toISOString().slice(0, 10);
|
||||
return `${prefix}-${isoDay}.csv`;
|
||||
}
|
||||
|
||||
/**
|
||||
* Trigger a browser download of `csvText` as a file. Creates an in-memory
|
||||
* Blob, attaches it to a hidden `<a download>`, clicks the link, then revokes
|
||||
* the object URL on the next tick so the download still has a live handle.
|
||||
*
|
||||
* Safe to call from SSR/Node — guards against a missing `document`.
|
||||
*/
|
||||
export function downloadCsv(filename: string, csvText: string): void {
|
||||
if (typeof document === "undefined" || typeof URL === "undefined") return;
|
||||
// Prepend BOM so Excel auto-detects UTF-8 on Windows. Tools that already
|
||||
// understand UTF-8 (Numbers, Google Sheets, every CSV parser in this repo)
|
||||
// ignore the leading bytes silently.
|
||||
const blob = new Blob(["\ufeff", csvText], { type: "text/csv;charset=utf-8" });
|
||||
const url = URL.createObjectURL(blob);
|
||||
const a = document.createElement("a");
|
||||
a.href = url;
|
||||
a.download = filename;
|
||||
// Some browsers require the link to be in the DOM before .click() works.
|
||||
a.style.display = "none";
|
||||
document.body.appendChild(a);
|
||||
a.click();
|
||||
document.body.removeChild(a);
|
||||
// Defer revoke so the browser has the URL handle when the download kicks off.
|
||||
queueMicrotask(() => URL.revokeObjectURL(url));
|
||||
}
|
||||
Reference in New Issue
Block a user