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Recursively handle change spans in shadow DOM #2

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Recursively handle change spans in shadow DOM #2

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a6acbcd
Recursively handle spans in shadow DOM
ogierMontanus Sep 12, 2025
505faac
Handle anchors in nested shadow roots
ogierMontanus Sep 12, 2025
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93 changes: 47 additions & 46 deletions templates/pages/andersen-single.html
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Original file line number Diff line number Diff line change
Expand Up @@ -130,54 +130,55 @@
};

function markSpans(span) {
const content = span.querySelector('#content');
const walker = document.createTreeWalker(
content,
NodeFilter.SHOW_ALL | NodeFilter.SHOW_TEXT
);


const delNodes = [];
content.querySelectorAll('a.delSpan').forEach((anchor) => {
walker.currentNode = anchor;
const end = content.querySelector(anchor.hash);
while (walker.nextNode()) {
if (walker.currentNode === end) {
break;
}
if (walker.currentNode.nodeType === Node.TEXT_NODE) {
delNodes.push(walker.currentNode);
}
let content = span.querySelector('#content');
if (!content && span.shadowRoot) {
content = span.shadowRoot.querySelector('#content');
}
if (!content) {
return;
}

function process(root) {
const wrapBetweenAnchors = (cls, name) => {
root.querySelectorAll(`a.${cls}`).forEach((anchor) => {
const nodes = [];
const walker = document.createTreeWalker(root, NodeFilter.SHOW_ALL);
walker.currentNode = anchor;
const end = root.querySelector(anchor.hash);
if (!end) {
return;
}
while (walker.nextNode()) {
if (walker.currentNode === end) {
break;
}
if (walker.currentNode.nodeType === Node.TEXT_NODE) {
nodes.push(walker.currentNode);
}
}
nodes.forEach((node) => {
const wrapper = document.createElement('span');
wrapper.className = name;
wrapper.appendChild(node.cloneNode());
node.replaceWith(wrapper);
});
});
};

wrapBetweenAnchors('delSpan', 'deleted');
wrapBetweenAnchors('addSpan', 'added');

if (root instanceof Element && root.shadowRoot) {
process(root.shadowRoot);
}

delNodes.forEach((node) => {
const wrapper = document.createElement('span');
wrapper.className = 'deleted';
wrapper.appendChild(node.cloneNode());
node.replaceWith(wrapper);
});
});

const addNodes = [];
content.querySelectorAll('a.addSpan').forEach((anchor) => {
walker.currentNode = anchor;
const end = content.querySelector(anchor.hash);
while (walker.nextNode()) {
if (walker.currentNode === end) {
break;
}
if (walker.currentNode.nodeType === Node.TEXT_NODE) {
addNodes.push(walker.currentNode);
root.querySelectorAll('*').forEach((el) => {
if (el.shadowRoot) {
process(el.shadowRoot);
}
}

addNodes.forEach((node) => {
const wrapper = document.createElement('span');
wrapper.className = 'added';
wrapper.appendChild(node.cloneNode());
node.replaceWith(wrapper);
});
});
}

process(content);
};

window.addEventListener('load', () => {
Expand All @@ -191,4 +192,4 @@
});
</script>
</body>
</html>
</html>