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import {POST} from '../modules/fetch.ts';
import {showErrorToast} from '../modules/toast.ts';
const preventListener = (e: Event) => e.preventDefault();
/**
* Attaches `input` handlers to markdown rendered tasklist checkboxes in comments.
*
* When a checkbox value changes, the corresponding [ ] or [x] in the markdown string
* is set accordingly and sent to the server. On success, it updates the raw-content on
* error it resets the checkbox to its original value.
*/
export function initMarkupTasklist(elMarkup: HTMLElement): void {
if (!elMarkup.matches('[data-can-edit=true]')) return;
const container = elMarkup.parentNode;
const checkboxes = elMarkup.querySelectorAll<HTMLInputElement>(`.task-list-item input[type=checkbox]`);
for (const checkbox of checkboxes) {
if (checkbox.hasAttribute('data-editable')) {
return;
}
checkbox.setAttribute('data-editable', 'true');
checkbox.addEventListener('input', async () => {
const checkboxCharacter = checkbox.checked ? 'x' : ' ';
const position = parseInt(checkbox.getAttribute('data-source-position')) + 1;
const rawContent = container.querySelector('.raw-content');
const oldContent = rawContent.textContent;
const encoder = new TextEncoder();
const buffer = encoder.encode(oldContent);
// Indexes may fall off the ends and return undefined.
if (buffer[position - 1] !== '['.codePointAt(0) ||
buffer[position] !== ' '.codePointAt(0) && buffer[position] !== 'x'.codePointAt(0) ||
buffer[position + 1] !== ']'.codePointAt(0)) {
// Position is probably wrong. Revert and don't allow change.
checkbox.checked = !checkbox.checked;
throw new Error(`Expected position to be space or x and surrounded by brackets, but it's not: position=${position}`);
}
buffer.set(encoder.encode(checkboxCharacter), position);
const newContent = new TextDecoder().decode(buffer);
if (newContent === oldContent) {
return;
}
// Prevent further inputs until the request is done. This does not use the
// `disabled` attribute because it causes the border to flash on click.
for (const checkbox of checkboxes) {
checkbox.addEventListener('click', preventListener);
}
try {
const editContentZone = container.querySelector<HTMLDivElement>('.edit-content-zone');
const updateUrl = editContentZone.getAttribute('data-update-url');
const context = editContentZone.getAttribute('data-context');
const contentVersion = editContentZone.getAttribute('data-content-version');
const requestBody = new FormData();
requestBody.append('ignore_attachments', 'true');
requestBody.append('content', newContent);
requestBody.append('context', context);
requestBody.append('content_version', contentVersion);
const response = await POST(updateUrl, {data: requestBody});
const data = await response.json();
if (response.status === 400) {
showErrorToast(data.errorMessage);
return;
}
editContentZone.setAttribute('data-content-version', data.contentVersion);
rawContent.textContent = newContent;
} catch (err) {
checkbox.checked = !checkbox.checked;
console.error(err);
}
// Enable input on checkboxes again
for (const checkbox of checkboxes) {
checkbox.removeEventListener('click', preventListener);
}
});
// Enable the checkboxes as they are initially disabled by the markdown renderer
for (const checkbox of checkboxes) {
checkbox.disabled = false;
}
}
}
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