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Add tree state functionality

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aaron.axvig
2026-07-11 21:46:23 -05:00
parent e812fe8b72
commit 20cd4ba6a0
6 changed files with 1435 additions and 6 deletions
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README.md
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@@ -2,7 +2,8 @@
A dependency-free, instance-based checkbox tree for browser ES modules. It A dependency-free, instance-based checkbox tree for browser ES modules. It
supports cascading selection, indeterminate parent states, expandable branches, supports cascading selection, indeterminate parent states, expandable branches,
multiple independent instances, and optional local-storage persistence. multiple independent instances, optional local-storage persistence, and compact
shareable URL state backed by an append-only node manifest.
## Install ## Install
@@ -65,6 +66,9 @@ flags.
- `setSelectedIds(ids, { notify })` replaces the selection. - `setSelectedIds(ids, { notify })` replaces the selection.
- `restoreState()` restores selection and expansion state. - `restoreState()` restores selection and expansion state.
- `destroy()` removes listeners, markup, and the root CSS class. - `destroy()` removes listeners, markup, and the root CSS class.
- `serializeStateToFragment(manifest)` returns `#v=1&c=...&x=...` state.
- `restoreStateFromLocation(manifest, location)` safely applies URL state.
- `validateManifest(manifest)` reports unregistered and missing paths.
Options: Options:
@@ -72,6 +76,32 @@ Options:
- `initiallySelected` defaults to `false`. - `initiallySelected` defaults to `false`.
- `storageKey` defaults to `null`, which disables persistence. - `storageKey` defaults to `null`, which disables persistence.
- `onSelectionChange` receives `{ selectedIds, selectedNodes }`. - `onSelectionChange` receives `{ selectedIds, selectedNodes }`.
- `manifest` optionally supplies a parsed manifest and automatically restores
state from `window.location.hash` after `setData()`.
## Shareable URL state
Create a JSON manifest whose array positions are permanent slots. Canonical node
paths join ancestor IDs with `>`:
```json
{ "schema": 1, "nodes": ["fruit", "fruit>apple", "fruit>pear", null] }
```
Import `loadManifest`, pass its result as the `manifest` option, and call
`tree.serializeStateToFragment()` when creating a share link. Existing entries
must never be reordered. Append new paths, replace removed paths with `null`, and
edit a path in place for a logical rename or move. Node IDs therefore cannot
contain `>`.
The fragment contains independently trimmed checked (`c`) and expanded (`x`)
bitsets. Bits are least-significant-bit first within each byte. Missing bits
default to unchecked and collapsed; malformed or unsupported state is ignored.
The helpers `encodeTreeState`, `decodeTreeState`, `applyTreeState`, and
`restoreStateFromLocation` are also exported for custom integrations.
Use `validateManifestEvolution(previous, next)` in a build check to reject
removed slots and tombstone reuse; path changes are reported for deliberate
rename/move review.
Styling is namespaced under `.checkbox-tree`. Override the custom properties Styling is namespaced under `.checkbox-tree`. Override the custom properties
`--checkbox-tree-indent`, `--checkbox-tree-toggle-size`, and `--checkbox-tree-indent`, `--checkbox-tree-toggle-size`, and
demo/index.html
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@@ -8,20 +8,25 @@
<style> <style>
body { max-width: 40rem; margin: 2rem auto; padding: 0 1rem; font-family: system-ui, sans-serif; } body { max-width: 40rem; margin: 2rem auto; padding: 0 1rem; font-family: system-ui, sans-serif; }
#selection { padding: 0.75rem; background: #f3f3f3; } #selection { padding: 0.75rem; background: #f3f3f3; }
#share-status { min-height: 1.5em; }
</style> </style>
</head> </head>
<body> <body>
<h1>Checkbox Tree</h1> <h1>Checkbox Tree</h1>
<p>A representative sample of countries, U.S. states, and North Dakota counties.</p> <p>A representative sample of countries, U.S. states, and North Dakota counties.</p>
<div id="tree"></div> <div id="tree"></div>
<p><button id="share" type="button">Copy shareable URL</button></p>
<p id="share-status" role="status"></p>
<h2>Selected places</h2> <h2>Selected places</h2>
<pre id="selection">[]</pre> <pre id="selection">[]</pre>
<script type="module"> <script type="module">
import { CheckboxTree } from "../src/checkbox-tree.js"; import { CheckboxTree, loadManifest } from "../src/checkbox-tree.js";
const output = document.querySelector("#selection"); const output = document.querySelector("#selection");
const manifest = loadManifest(await fetch("./manifest.json").then(response => response.json()));
const tree = new CheckboxTree(document.querySelector("#tree"), { const tree = new CheckboxTree(document.querySelector("#tree"), {
initiallySelected: true, initiallySelected: true,
manifest,
onSelectionChange({ selectedIds }) { onSelectionChange({ selectedIds }) {
output.textContent = JSON.stringify(selectedIds, null, 2); output.textContent = JSON.stringify(selectedIds, null, 2);
}, },
@@ -72,6 +77,35 @@
{ id: "country:south-africa", label: "South Africa" }, { id: "country:south-africa", label: "South Africa" },
]); ]);
output.textContent = JSON.stringify(tree.getSelectedIds(), null, 2); output.textContent = JSON.stringify(tree.getSelectedIds(), null, 2);
function updateUrl() {
const url = new URL(window.location.href);
url.hash = tree.serializeStateToFragment();
if (url.href !== window.location.href) history.pushState(null, "", url);
}
document.querySelector("#tree").addEventListener("change", updateUrl);
document.querySelector("#tree").addEventListener("click", event => {
if (event.target.closest('.checkbox-tree__toggle')) updateUrl();
});
window.addEventListener("popstate", () => {
tree.restoreStateFromLocation();
output.textContent = JSON.stringify(tree.getSelectedIds(), null, 2);
document.querySelector("#share-status").textContent = "";
});
document.querySelector("#share").addEventListener("click", async () => {
const url = new URL(window.location.href);
url.hash = tree.serializeStateToFragment();
const status = document.querySelector("#share-status");
try {
await navigator.clipboard.writeText(url.href);
status.textContent = "Shareable URL copied.";
} catch {
status.textContent = `Share this URL: ${url.href}`;
}
});
</script> </script>
</body> </body>
</html> </html>
demo/manifest.json
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@@ -0,0 +1,37 @@
{
"schema": 1,
"nodes": [
"country:argentina",
"country:australia",
"country:brazil",
"country:canada",
"country:france",
"country:germany",
"country:india",
"country:japan",
"country:mexico",
"country:united-kingdom",
"country:usa",
"country:usa>state:california",
"country:usa>state:florida",
"country:usa>state:illinois",
"country:usa>state:minnesota",
"country:usa>state:montana",
"country:usa>state:north-dakota",
"country:usa>state:north-dakota>county:adams-nd",
"country:usa>state:north-dakota>county:barnes-nd",
"country:usa>state:north-dakota>county:burleigh-nd",
"country:usa>state:north-dakota>county:cass-nd",
"country:usa>state:north-dakota>county:grand-forks-nd",
"country:usa>state:north-dakota>county:mckenzie-nd",
"country:usa>state:north-dakota>county:morton-nd",
"country:usa>state:north-dakota>county:ramsey-nd",
"country:usa>state:north-dakota>county:stark-nd",
"country:usa>state:north-dakota>county:ward-nd",
"country:usa>state:new-york",
"country:usa>state:south-dakota",
"country:usa>state:texas",
"country:usa>state:washington",
"country:south-africa"
]
}
docs/tree-state-serialization.md
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src/checkbox-tree.js
+222 -3
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@@ -2,9 +2,200 @@ const DEFAULT_OPTIONS = {
initiallyCollapsed: true, initiallyCollapsed: true,
initiallySelected: false, initiallySelected: false,
storageKey: null, storageKey: null,
onSelectionChange: null onSelectionChange: null,
manifest: null
}; };
const SERIALIZATION_VERSION = 1;
const PATH_DELIMITER = '>';
export function loadManifest(source) {
let records;
let schema = 1;
if (typeof source === 'string') {
records = source.split(/\r?\n/)
.map(line => line.trim())
.filter(line => line && !line.startsWith('#'))
.map(line => line === '!deleted' ? null : line);
} else if (source && typeof source === 'object' && Array.isArray(source.nodes)) {
schema = source.schema;
records = source.nodes;
} else if (source && Array.isArray(source.slots)) {
return normalizeManifest(source.schema, source.slots.map(slot => slot?.deleted ? null : slot?.path));
} else {
throw new TypeError('CheckboxTree manifest must be text or an object with a nodes array.');
}
return normalizeManifest(schema, records);
}
function normalizeManifest(schema, records) {
if (schema !== 1) {
throw new Error(`Unsupported CheckboxTree manifest schema: ${schema}`);
}
const pathToSlot = new Map();
const slots = records.map((record, index) => {
if (record === null || record === '!deleted') {
return { path: null, deleted: true };
}
if (typeof record !== 'string' || !record || record.trim() !== record) {
throw new TypeError(`Invalid CheckboxTree manifest entry at slot ${index}.`);
}
if (pathToSlot.has(record)) {
throw new Error(`Duplicate CheckboxTree manifest path: ${record}`);
}
pathToSlot.set(record, index);
return { path: record, deleted: false };
});
return { schema: 1, slots, pathToSlot };
}
export function setBit(bytes, bitIndex, value) {
const byteIndex = Math.floor(bitIndex / 8);
const mask = 1 << (bitIndex % 8);
if (value) bytes[byteIndex] |= mask;
else bytes[byteIndex] &= ~mask;
}
export function getBit(bytes, bitIndex) {
const byteIndex = Math.floor(bitIndex / 8);
return byteIndex < bytes.length && (bytes[byteIndex] & (1 << (bitIndex % 8))) !== 0;
}
export function bytesToBase64Url(bytes) {
let binary = '';
for (const byte of bytes) binary += String.fromCharCode(byte);
return btoa(binary).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '');
}
export function base64UrlToBytes(value, maximumLength = Infinity) {
if (typeof value !== 'string' || !/^[A-Za-z0-9_-]*$/.test(value) || value.length % 4 === 1) {
throw new Error('Invalid Base64URL value.');
}
const base64 = value.replace(/-/g, '+').replace(/_/g, '/');
const binary = atob(base64 + '='.repeat((4 - base64.length % 4) % 4));
if (binary.length > maximumLength) throw new Error('Encoded tree state exceeds the manifest size.');
return Uint8Array.from(binary, character => character.charCodeAt(0));
}
function trimTrailingZeroBytes(bytes) {
let end = bytes.length;
while (end && bytes[end - 1] === 0) end--;
return bytes.slice(0, end);
}
function asManifest(manifest) {
return manifest?.pathToSlot instanceof Map ? manifest : loadManifest(manifest);
}
export function validateManifest(manifest, tree) {
const normalized = asManifest(manifest);
const treePaths = new Set(tree.nodesByPath.keys());
return {
valid: Array.from(treePaths).every(path => normalized.pathToSlot.has(path)),
unregisteredPaths: Array.from(treePaths).filter(path => !normalized.pathToSlot.has(path)),
missingPaths: normalized.slots
.filter(slot => !slot.deleted && !treePaths.has(slot.path))
.map(slot => slot.path)
};
}
export function validateManifestEvolution(previous, next) {
const oldManifest = asManifest(previous);
const newManifest = asManifest(next);
const errors = [];
if (newManifest.slots.length < oldManifest.slots.length) {
errors.push('Manifest slots cannot be removed; use tombstones.');
}
oldManifest.slots.forEach((oldSlot, index) => {
const newSlot = newManifest.slots[index];
if (!newSlot) return;
if (oldSlot.deleted && !newSlot.deleted) {
errors.push(`Tombstoned slot ${index} cannot be reused.`);
}
if (!oldSlot.deleted && !newSlot.deleted && oldSlot.path !== newSlot.path) {
errors.push(`Slot ${index} changed path; confirm this is a logical rename or move.`);
}
});
return { valid: errors.length === 0, errors };
}
export function encodeTreeState(tree, manifest) {
const normalized = asManifest(manifest);
const byteLength = Math.ceil(normalized.slots.length / 8);
const checked = new Uint8Array(byteLength);
const expanded = new Uint8Array(byteLength);
for (const [path, node] of tree.nodesByPath) {
const slot = normalized.pathToSlot.get(path);
if (slot === undefined) continue;
const item = tree.itemForNode(node.id);
const checkbox = item && tree.directCheckbox(item);
const toggle = item?.querySelector(':scope > .checkbox-tree__row > .checkbox-tree__toggle');
setBit(checked, slot, Boolean(checkbox?.checked));
setBit(expanded, slot, toggle?.getAttribute('aria-expanded') === 'true');
}
const checkedValue = bytesToBase64Url(trimTrailingZeroBytes(checked));
const expandedValue = bytesToBase64Url(trimTrailingZeroBytes(expanded));
return { version: SERIALIZATION_VERSION, checked: checkedValue || null, expanded: expandedValue || null };
}
export function decodeTreeState(fragment, manifest) {
const normalized = asManifest(manifest);
const value = fragment.startsWith('#') ? fragment.slice(1) : fragment;
const params = new URLSearchParams(value);
if (params.get('v') !== String(SERIALIZATION_VERSION)) {
return { applied: false, version: params.get('v'), warnings: ['Missing or unsupported serialization version.'] };
}
const maximumLength = Math.ceil(normalized.slots.length / 8);
try {
return {
applied: true,
version: SERIALIZATION_VERSION,
checked: base64UrlToBytes(params.get('c') ?? '', maximumLength),
expanded: base64UrlToBytes(params.get('x') ?? '', maximumLength),
warnings: []
};
} catch (error) {
return { applied: false, version: SERIALIZATION_VERSION, warnings: [error.message] };
}
}
export function applyTreeState(tree, manifest, state) {
if (!state?.applied) return false;
const normalized = asManifest(manifest);
for (const [path, node] of tree.nodesByPath) {
const slot = normalized.pathToSlot.get(path);
if (slot === undefined) continue;
const item = tree.itemForNode(node.id);
const checkbox = item && tree.directCheckbox(item);
if (checkbox && !checkbox.disabled) checkbox.checked = getBit(state.checked, slot);
tree.setExpanded(item, getBit(state.expanded, slot));
}
tree.updateAllParentCheckboxes();
return true;
}
export function serializeStateToFragment(tree, manifest) {
const state = encodeTreeState(tree, manifest);
const params = new URLSearchParams({ v: String(state.version) });
if (state.checked) params.set('c', state.checked);
if (state.expanded) params.set('x', state.expanded);
return `#${params}`;
}
export function restoreStateFromLocation(tree, manifest, location = window.location) {
const state = decodeTreeState(location.hash ?? '', manifest);
if (state.applied) applyTreeState(tree, manifest, state);
return state;
}
export class CheckboxTree { export class CheckboxTree {
constructor(container, options = {}) { constructor(container, options = {}) {
if (!(container instanceof Element)) { if (!(container instanceof Element)) {
@@ -14,6 +205,7 @@ export class CheckboxTree {
this.container = container; this.container = container;
this.options = { ...DEFAULT_OPTIONS, ...options }; this.options = { ...DEFAULT_OPTIONS, ...options };
this.nodesById = new Map(); this.nodesById = new Map();
this.nodesByPath = new Map();
this.rootNodes = []; this.rootNodes = [];
this.handleChange = this.handleChange.bind(this); this.handleChange = this.handleChange.bind(this);
this.handleClick = this.handleClick.bind(this); this.handleClick = this.handleClick.bind(this);
@@ -29,11 +221,13 @@ export class CheckboxTree {
} }
this.nodesById.clear(); this.nodesById.clear();
this.nodesByPath.clear();
this.rootNodes = nodes; this.rootNodes = nodes;
this.indexNodes(nodes); this.indexNodes(nodes);
this.render(); this.render();
this.updateAllParentCheckboxes(); this.updateAllParentCheckboxes();
this.restoreState(); this.restoreState();
if (this.options.manifest) this.restoreStateFromLocation();
} }
getSelectedIds() { getSelectedIds() {
@@ -66,9 +260,10 @@ export class CheckboxTree {
this.container.classList.remove('checkbox-tree'); this.container.classList.remove('checkbox-tree');
this.container.replaceChildren(); this.container.replaceChildren();
this.nodesById.clear(); this.nodesById.clear();
this.nodesByPath.clear();
} }
indexNodes(nodes) { indexNodes(nodes, parentPath = '') {
nodes.forEach(node => { nodes.forEach(node => {
if (!node || typeof node.id !== 'string' || !node.id || typeof node.label !== 'string') { if (!node || typeof node.id !== 'string' || !node.id || typeof node.label !== 'string') {
throw new TypeError('Each CheckboxTree node requires non-empty string id and label properties.'); throw new TypeError('Each CheckboxTree node requires non-empty string id and label properties.');
@@ -77,12 +272,18 @@ export class CheckboxTree {
throw new Error(`Duplicate CheckboxTree node id: ${node.id}`); throw new Error(`Duplicate CheckboxTree node id: ${node.id}`);
} }
if (node.id.includes(PATH_DELIMITER)) {
throw new Error(`CheckboxTree node id cannot contain "${PATH_DELIMITER}": ${node.id}`);
}
this.nodesById.set(node.id, node); this.nodesById.set(node.id, node);
const path = parentPath ? `${parentPath}${PATH_DELIMITER}${node.id}` : node.id;
this.nodesByPath.set(path, node);
if (node.children !== undefined) { if (node.children !== undefined) {
if (!Array.isArray(node.children)) { if (!Array.isArray(node.children)) {
throw new TypeError(`CheckboxTree node children must be an array: ${node.id}`); throw new TypeError(`CheckboxTree node children must be an array: ${node.id}`);
} }
this.indexNodes(node.children); this.indexNodes(node.children, path);
} }
}); });
} }
@@ -191,6 +392,7 @@ export class CheckboxTree {
} }
setExpanded(item, expanded) { setExpanded(item, expanded) {
if (!item) return;
const toggle = item.querySelector(':scope > .checkbox-tree__row > .checkbox-tree__toggle'); const toggle = item.querySelector(':scope > .checkbox-tree__row > .checkbox-tree__toggle');
const children = this.directChildrenContainer(item); const children = this.directChildrenContainer(item);
if (!toggle || !children) { if (!toggle || !children) {
@@ -211,6 +413,11 @@ export class CheckboxTree {
return item.querySelector(':scope > .checkbox-tree__row .checkbox-tree__checkbox'); return item.querySelector(':scope > .checkbox-tree__row .checkbox-tree__checkbox');
} }
itemForNode(id) {
return Array.from(this.container.querySelectorAll('.checkbox-tree__item'))
.find(item => item.dataset.nodeId === id) ?? null;
}
updateAncestorCheckboxes(item) { updateAncestorCheckboxes(item) {
let parentItem = item.parentElement?.closest('.checkbox-tree__item'); let parentItem = item.parentElement?.closest('.checkbox-tree__item');
while (parentItem && this.container.contains(parentItem)) { while (parentItem && this.container.contains(parentItem)) {
@@ -286,4 +493,16 @@ export class CheckboxTree {
}); });
} }
} }
validateManifest(manifest = this.options.manifest) {
return validateManifest(manifest, this);
}
serializeStateToFragment(manifest = this.options.manifest) {
return serializeStateToFragment(this, manifest);
}
restoreStateFromLocation(manifest = this.options.manifest, location = window.location) {
return restoreStateFromLocation(this, manifest, location);
}
} }
test/checkbox-tree.test.js
+106 -1
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@@ -8,7 +8,16 @@ globalThis.document = dom.window.document;
globalThis.Element = dom.window.Element; globalThis.Element = dom.window.Element;
globalThis.localStorage = dom.window.localStorage; globalThis.localStorage = dom.window.localStorage;
const { CheckboxTree } = await import('../src/checkbox-tree.js'); const {
CheckboxTree,
base64UrlToBytes,
bytesToBase64Url,
decodeTreeState,
getBit,
loadManifest,
setBit,
validateManifestEvolution
} = await import('../src/checkbox-tree.js');
function createTree(options = {}) { function createTree(options = {}) {
const container = document.createElement('div'); const container = document.createElement('div');
@@ -103,3 +112,99 @@ test('rejects duplicate node ids', () => {
/Duplicate CheckboxTree node id/ /Duplicate CheckboxTree node id/
); );
}); });
test('bit operations use least-significant-bit-first byte ordering', () => {
const bytes = new Uint8Array(2);
setBit(bytes, 0, true);
setBit(bytes, 7, true);
setBit(bytes, 8, true);
assert.deepEqual(Array.from(bytes), [129, 1]);
assert.equal(getBit(bytes, 0), true);
assert.equal(getBit(bytes, 7), true);
assert.equal(getBit(bytes, 8), true);
assert.equal(getBit(bytes, 16), false);
setBit(bytes, 7, false);
assert.deepEqual(Array.from(bytes), [1, 1]);
});
test('Base64URL encoding is unpadded, URL-safe, and round trips', () => {
const bytes = Uint8Array.from([251, 255, 0]);
const encoded = bytesToBase64Url(bytes);
assert.equal(encoded, '-_8A');
assert.deepEqual(Array.from(base64UrlToBytes(encoded)), Array.from(bytes));
assert.equal(bytesToBase64Url(new Uint8Array()), '');
assert.throws(() => base64UrlToBytes('not valid!'), /Invalid Base64URL/);
});
test('loads text and JSON manifests while retaining tombstone slots', () => {
const text = loadManifest('# tree-state-manifest\nroot\n!deleted\nroot>child\n');
assert.equal(text.slots.length, 3);
assert.equal(text.slots[1].deleted, true);
assert.equal(text.pathToSlot.get('root>child'), 2);
const json = loadManifest({ schema: 1, nodes: ['renamed', null, 'renamed>child', 'new'] });
assert.equal(json.pathToSlot.get('renamed>child'), 2);
assert.equal(json.pathToSlot.get('new'), 3);
assert.throws(() => loadManifest({ schema: 1, nodes: ['same', 'same'] }), /Duplicate/);
});
test('manifest evolution rejects slot removal and tombstone reuse', () => {
const original = { schema: 1, nodes: ['root', null, 'root>child'] };
assert.equal(validateManifestEvolution(original, {
schema: 1,
nodes: ['root', null, 'root>child', 'new']
}).valid, true);
assert.match(validateManifestEvolution(original, {
schema: 1,
nodes: ['root', 'reused', 'root>child']
}).errors[0], /cannot be reused/);
assert.match(validateManifestEvolution(original, {
schema: 1,
nodes: ['root']
}).errors[0], /cannot be removed/);
});
test('serializes and restores checked and expanded state through a fragment', () => {
const manifest = loadManifest({ schema: 1, nodes: ['parent', 'parent>first', null, 'parent>second'] });
const first = createTree();
checkbox(first.container, 'first').click();
first.container.querySelector('.checkbox-tree__toggle').click();
const fragment = first.tree.serializeStateToFragment(manifest);
assert.equal(fragment, '#v=1&c=Ag&x=AQ');
const second = createTree({ manifest });
const result = second.tree.restoreStateFromLocation(manifest, { hash: fragment });
assert.equal(result.applied, true);
assert.deepEqual(second.tree.getSelectedIds(), ['first']);
assert.equal(second.container.querySelector('.checkbox-tree__toggle').getAttribute('aria-expanded'), 'true');
});
test('compatible manifest changes preserve slots and default appended nodes', () => {
const oldManifest = loadManifest({ schema: 1, nodes: ['parent', 'parent>first', 'parent>second'] });
const first = createTree();
checkbox(first.container, 'first').click();
const fragment = first.tree.serializeStateToFragment(oldManifest);
const evolved = loadManifest({ schema: 1, nodes: ['parent', 'parent>first', null, 'parent>second', 'future'] });
const second = createTree();
const result = second.tree.restoreStateFromLocation(evolved, { hash: fragment });
assert.equal(result.applied, true);
assert.deepEqual(second.tree.getSelectedIds(), ['first']);
assert.deepEqual(second.tree.validateManifest(evolved), {
valid: true,
unregisteredPaths: [],
missingPaths: ['future']
});
});
test('malformed, oversized, and unsupported URL state fails safely', () => {
const manifest = loadManifest({ schema: 1, nodes: ['parent', 'parent>first', 'parent>second'] });
assert.equal(decodeTreeState('#v=2&c=AQ', manifest).applied, false);
assert.equal(decodeTreeState('#v=1&c=!', manifest).applied, false);
assert.equal(decodeTreeState('#v=1&c=AQA', manifest).applied, false);
const { tree } = createTree({ initiallySelected: true });
const result = tree.restoreStateFromLocation(manifest, { hash: '#v=1&c=!' });
assert.equal(result.applied, false);
assert.deepEqual(tree.getSelectedIds(), ['parent', 'first', 'second']);
});