| 1 | // TodoMVC behaviour on top of the server-rendered page. Every change is |
| 2 | // still one of the page's own form POSTs; this script sends it with |
| 3 | // fetch and an `X-Fragment: 1` header, and the server answers with the |
| 4 | // fresh section.main and footer.footer, which replace the old ones. |
| 5 | // Without this script the same forms submit normally. |
| 6 | |
| 7 | const app = document.querySelector('.todoapp'); |
| 8 | const header = app.querySelector('.header'); |
| 9 | |
| 10 | let queue = Promise.resolve(); |
| 11 | |
| 12 | function render(html) { |
| 13 | for (const el of app.querySelectorAll(':scope > .main, :scope > .footer')) el.remove(); |
| 14 | header.insertAdjacentHTML('afterend', html); |
| 15 | } |
| 16 | |
| 17 | // POSTs run one after another, in the order they were made. |
| 18 | function send(form) { |
| 19 | const body = new URLSearchParams(new FormData(form)); |
| 20 | queue = queue.then(async () => { |
| 21 | try { |
| 22 | const res = await fetch(form.action, { |
| 23 | method: 'POST', |
| 24 | body, |
| 25 | headers: { 'X-Fragment': '1' }, |
| 26 | credentials: 'same-origin', |
| 27 | }); |
| 28 | if (!res.ok) throw new Error(`${res.status}`); |
| 29 | render(await res.text()); |
| 30 | } catch { |
| 31 | location.reload(); |
| 32 | } |
| 33 | }); |
| 34 | return queue; |
| 35 | } |
| 36 | |
| 37 | app.addEventListener('submit', (e) => { |
| 38 | const form = e.target; |
| 39 | e.preventDefault(); |
| 40 | if (form.classList.contains('edit-form')) { |
| 41 | const li = form.closest('li'); |
| 42 | if (!li.classList.contains('editing')) return; |
| 43 | li.classList.remove('editing'); |
| 44 | } |
| 45 | send(form); |
| 46 | const input = form.querySelector('.new-todo'); |
| 47 | if (input) input.value = ''; |
| 48 | }); |
| 49 | |
| 50 | // The checkboxes belong to their item's toggle form (and the toggle-all |
| 51 | // form) through the `form` attribute; a change submits that form. |
| 52 | app.addEventListener('change', (e) => { |
| 53 | const box = e.target; |
| 54 | if (box.matches('.toggle, .toggle-all') && box.form) box.form.requestSubmit(); |
| 55 | }); |
| 56 | |
| 57 | app.addEventListener('dblclick', (e) => { |
| 58 | const label = e.target.closest('.todo-list li label'); |
| 59 | if (!label) return; |
| 60 | const li = label.closest('li'); |
| 61 | const input = li.querySelector('.edit'); |
| 62 | input.value = label.textContent; |
| 63 | li.classList.add('editing'); |
| 64 | input.focus(); |
| 65 | input.setSelectionRange(input.value.length, input.value.length); |
| 66 | }); |
| 67 | |
| 68 | app.addEventListener('keydown', (e) => { |
| 69 | if (e.key !== 'Escape' || !e.target.matches('.edit')) return; |
| 70 | const li = e.target.closest('li'); |
| 71 | e.target.value = li.querySelector('label').textContent; |
| 72 | li.classList.remove('editing'); |
| 73 | }); |
| 74 | |
| 75 | // Leaving the editor saves, as in TodoMVC. focusout bubbles; blur doesn't. |
| 76 | app.addEventListener('focusout', (e) => { |
| 77 | if (!e.target.matches('.edit')) return; |
| 78 | const li = e.target.closest('li'); |
| 79 | if (li && li.classList.contains('editing')) e.target.form.requestSubmit(); |
| 80 | }); |
| 81 | |
amadan