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static/js/admin.js

8d1bb5bfdd2cba82488775b46308efed740132a8 · 2.0 KB · 60 lines raw

1 // Progressive enhancement for the notices admin form.
2 //
3 // Without JavaScript the server-rendered checkbox removes a row and the
4 // single blank row is how you add one. This script only makes those two
5 // actions interactive: it turns the checkbox into a Remove button and
6 // clones the blank row for an Add button. It never changes what the form
7 // submits, so a JS-on submit and a JS-off submit build the same document.
8 (function () {
9 'use strict';
10
11 var form = document.querySelector('form.admin-form');
12 if (!form) return;
13 document.body.classList.add('has-js');
14
15 var tbody = form.querySelector('tbody');
16 if (!tbody) return;
17
18 // Capture the server-rendered blank "add" row before anyone types in it,
19 // and use its markup as the template for rows the Add button creates.
20 var seed = tbody.lastElementChild;
21 if (!seed) return;
22 var seedHTML = seed.outerHTML;
23
24 function enhance(row) {
25 var cell = row.querySelector('.admin-del');
26 if (!cell || cell.dataset.enhanced) return;
27 cell.dataset.enhanced = '1';
28
29 // The checkbox stays in the DOM (hidden) so a form that is somehow
30 // submitted without JS still means what it did before.
31 var box = cell.querySelector('input[type=checkbox]');
32 if (box) box.hidden = true;
33
34 var btn = document.createElement('button');
35 btn.type = 'button';
36 btn.className = 'chip row-remove';
37 btn.textContent = 'Remove';
38 btn.addEventListener('click', function () {
39 row.parentNode.removeChild(row);
40 });
41 cell.appendChild(btn);
42 }
43
44 function addRow() {
45 var wrap = document.createElement('tbody');
46 wrap.innerHTML = seedHTML;
47 var row = wrap.firstElementChild;
48 row.querySelectorAll('input, textarea').forEach(function (el) {
49 if (el.type === 'checkbox') el.checked = false;
50 else el.value = '';
51 });
52 tbody.appendChild(row);
53 enhance(row);
54 }
55
56 Array.prototype.forEach.call(tbody.querySelectorAll('tr'), enhance);
57
58 var add = document.getElementById('add-notice');
59 if (add) add.addEventListener('click', addRow);
60 })();