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Fix race condition in mermaid observer #32599

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Fix race condition in mermaid observer #32599

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19 changes: 11 additions & 8 deletions web_src/js/markup/mermaid.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,16 +58,12 @@ export async function renderMermaid(): Promise<void> {
mermaidBlock.append(btn);

const updateIframeHeight = () => {
iframe.style.height = `${iframe.contentWindow.document.body.clientHeight}px`;
const body = iframe.contentWindow?.document?.body;
if (body) {
iframe.style.height = `${body.clientHeight}px`;
}
};

// update height when element's visibility state changes, for example when the diagram is inside
// a <details> + <summary> block and the <details> block becomes visible upon user interaction, it
// would initially set a incorrect height and the correct height is set during this callback.
(new IntersectionObserver(() => {
updateIframeHeight();
}, {root: document.documentElement})).observe(iframe);

iframe.addEventListener('load', () => {
pre.replaceWith(mermaidBlock);
mermaidBlock.classList.remove('tw-hidden');
Expand All @@ -76,6 +72,13 @@ export async function renderMermaid(): Promise<void> {
mermaidBlock.classList.remove('is-loading');
iframe.classList.remove('tw-invisible');
}, 0);

// update height when element's visibility state changes, for example when the diagram is inside
// a <details> + <summary> block and the <details> block becomes visible upon user interaction, it
// would initially set a incorrect height and the correct height is set during this callback.
(new IntersectionObserver(() => {
updateIframeHeight();
}, {root: document.documentElement})).observe(iframe);
});

document.body.append(mermaidBlock);
Expand Down