Skip to content

fix: Mermaid tab UI never rendered (wrong sibling lookup) #20

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We鈥檒l occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
jwsung91 merged 1 commit into from
Jul 3, 2026
Merged

fix: Mermaid tab UI never rendered (wrong sibling lookup) #20

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
158 changes: 82 additions & 76 deletions src/pages/blog/[...slug].astro
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -270,85 +270,91 @@ const blogPostingStructuredData = {

<script>
const enhanceMermaidTabs = () => {
document.querySelectorAll('.mermaid').forEach((diagram, index) => {
if (diagram.closest('.mermaid-tabs')) {
return;
}
document
.querySelectorAll('figure.mermaid-figure')
.forEach((figure, index) => {
if (figure.closest('.mermaid-tabs')) {
return;
}

const previousElement = diagram.previousElementSibling;
const codeBlock = previousElement?.matches(
'pre[data-language="mermaid"]',
)
? previousElement
: previousElement?.classList.contains('code-copy-wrapper') &&
previousElement.querySelector('pre[data-language="mermaid"]')
? previousElement
: null;
const diagram = figure.querySelector('.mermaid');
const detailsBlock = figure.nextElementSibling;

if (!codeBlock) {
return;
}
if (!diagram || !detailsBlock?.matches('details.mermaid-source')) {
return;
}

const tabId = `mermaid-tab-${index}`;
const wrapper = document.createElement('div');
wrapper.className = 'mermaid-tabs not-prose';

const tabList = document.createElement('div');
tabList.className = 'mermaid-tab-list';
tabList.setAttribute('role', 'tablist');
tabList.setAttribute('aria-label', 'Mermaid display mode');

const diagramButton = document.createElement('button');
diagramButton.type = 'button';
diagramButton.className = 'mermaid-tab-button is-active';
diagramButton.id = `${tabId}-diagram-tab`;
diagramButton.textContent = 'Mermaid';
diagramButton.setAttribute('role', 'tab');
diagramButton.setAttribute('aria-controls', `${tabId}-diagram-panel`);
diagramButton.setAttribute('aria-selected', 'true');

const codeButton = document.createElement('button');
codeButton.type = 'button';
codeButton.className = 'mermaid-tab-button';
codeButton.id = `${tabId}-code-tab`;
codeButton.textContent = 'Code';
codeButton.setAttribute('role', 'tab');
codeButton.setAttribute('aria-controls', `${tabId}-code-panel`);
codeButton.setAttribute('aria-selected', 'false');

const diagramPanel = document.createElement('div');
diagramPanel.className = 'mermaid-tab-panel';
diagramPanel.id = `${tabId}-diagram-panel`;
diagramPanel.setAttribute('role', 'tabpanel');
diagramPanel.setAttribute('aria-labelledby', diagramButton.id);

const codePanel = document.createElement('div');
codePanel.className = 'mermaid-tab-panel';
codePanel.id = `${tabId}-code-panel`;
codePanel.setAttribute('role', 'tabpanel');
codePanel.setAttribute('aria-labelledby', codeButton.id);
codePanel.hidden = true;

codeBlock.parentNode?.insertBefore(wrapper, codeBlock);
tabList.append(diagramButton, codeButton);
diagramPanel.append(diagram);
codePanel.append(codeBlock);
wrapper.append(tabList, diagramPanel, codePanel);

const activateTab = (mode: 'diagram' | 'code') => {
const showDiagram = mode === 'diagram';

diagramPanel.hidden = !showDiagram;
codePanel.hidden = showDiagram;
diagramButton.classList.toggle('is-active', showDiagram);
codeButton.classList.toggle('is-active', !showDiagram);
diagramButton.setAttribute('aria-selected', String(showDiagram));
codeButton.setAttribute('aria-selected', String(!showDiagram));
};

diagramButton.addEventListener('click', () => activateTab('diagram'));
codeButton.addEventListener('click', () => activateTab('code'));
});
const codeBlock =
detailsBlock.querySelector('.code-copy-wrapper') ??
detailsBlock.querySelector('pre');

if (!codeBlock) {
return;
}

const tabId = `mermaid-tab-${index}`;
const wrapper = document.createElement('div');
wrapper.className = 'mermaid-tabs not-prose';

const tabList = document.createElement('div');
tabList.className = 'mermaid-tab-list';
tabList.setAttribute('role', 'tablist');
tabList.setAttribute('aria-label', 'Mermaid display mode');

const diagramButton = document.createElement('button');
diagramButton.type = 'button';
diagramButton.className = 'mermaid-tab-button is-active';
diagramButton.id = `${tabId}-diagram-tab`;
diagramButton.textContent = 'Mermaid';
diagramButton.setAttribute('role', 'tab');
diagramButton.setAttribute('aria-controls', `${tabId}-diagram-panel`);
diagramButton.setAttribute('aria-selected', 'true');

const codeButton = document.createElement('button');
codeButton.type = 'button';
codeButton.className = 'mermaid-tab-button';
codeButton.id = `${tabId}-code-tab`;
codeButton.textContent = 'Code';
codeButton.setAttribute('role', 'tab');
codeButton.setAttribute('aria-controls', `${tabId}-code-panel`);
codeButton.setAttribute('aria-selected', 'false');

const diagramPanel = document.createElement('div');
diagramPanel.className = 'mermaid-tab-panel';
diagramPanel.id = `${tabId}-diagram-panel`;
diagramPanel.setAttribute('role', 'tabpanel');
diagramPanel.setAttribute('aria-labelledby', diagramButton.id);

const codePanel = document.createElement('div');
codePanel.className = 'mermaid-tab-panel';
codePanel.id = `${tabId}-code-panel`;
codePanel.setAttribute('role', 'tabpanel');
codePanel.setAttribute('aria-labelledby', codeButton.id);
codePanel.hidden = true;

figure.parentNode?.insertBefore(wrapper, figure);
tabList.append(diagramButton, codeButton);
diagramPanel.append(diagram);
codePanel.append(codeBlock);
wrapper.append(tabList, diagramPanel, codePanel);

figure.remove();
detailsBlock.remove();

const activateTab = (mode: 'diagram' | 'code') => {
const showDiagram = mode === 'diagram';

diagramPanel.hidden = !showDiagram;
codePanel.hidden = showDiagram;
diagramButton.classList.toggle('is-active', showDiagram);
codeButton.classList.toggle('is-active', !showDiagram);
diagramButton.setAttribute('aria-selected', String(showDiagram));
codeButton.setAttribute('aria-selected', String(!showDiagram));
};

diagramButton.addEventListener('click', () => activateTab('diagram'));
codeButton.addEventListener('click', () => activateTab('code'));
});
};

if (document.querySelectorAll('.mermaid').length) {
Expand Down