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show an announcer if page changes for a11y reasons #53

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show an announcer if page changes for a11y reasons #53

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23 changes: 23 additions & 0 deletions lib/router.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,17 @@ export class Router {
private prefetched = new Set<string>();
private observer: IntersectionObserver;

// Announces the current page title to screen readers
private announcer: HTMLDivElement;

constructor(public opts?: FlamethrowerOptions) {
this.opts = { ...defaultOpts, ...(opts ?? {}) };

if (window?.history) {
document.addEventListener('click', (e) => this.onClick(e));
window.addEventListener('popstate', (e) => this.onPop(e));
this.prefetch();
this.announcePageChanged();
} else {
console.warn(
'flamethrower router not supported in this browser or environment'
Expand Down Expand Up @@ -214,6 +218,8 @@ export class Router {

window.dispatchEvent(new CustomEvent('flamethrower:router:end'));

this.announcePageChanged();

// delay for any js rendered links
setTimeout(() => {
this.prefetch();
Expand All @@ -228,4 +234,21 @@ export class Router {
return false;
}
}
/**
* Announces the current page title to screen readers
*/
private announcePageChanged(): void {
if (!this.announcer) {
this.announcer = document.createElement('div');
this.announcer.setAttribute('id', 'flamethrower-announcer');
this.announcer.setAttribute('aria-live', 'assertive');
this.announcer.setAttribute('aria-atomic', 'true');
this.announcer.setAttribute(
'style',
'position: absolute; left: 0; top: 0; clip: rect(0 0 0 0); clip-path: inset(50%); overflow: hidden; white-space: nowrap; width: 1px; height: 1px'
);
}
this.announcer.textContent = document.title;
document.body.appendChild(this.announcer);
}
}
15 changes: 14 additions & 1 deletion test/main.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,20 @@ test('prefetching works', async ({ page }) => {

// ensure no duplicates
preAbout = page.locator('link[href="/about"]');
await expect(preAbout).toHaveCount(1)
await expect(preAbout).toHaveCount(1);


});

test('page change announcer works', async ({ page }) => {
await page.goto('http://localhost:3000');

const announcer = page.locator('#flamethrower-announcer');

await expect(announcer).toHaveText('Flamethrower');

const about = page.locator('#about');
await about.click();

await expect(announcer).toHaveText('About');
});