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Fix case where "ready" message is received before frame "load" event (#1822)

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toasted-nutbread 2021-07-10 21:37:37 -04:00 committed by GitHub
parent 2387ed43d9
commit 437b588411
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 2 deletions
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18
ext/js/templates/template-renderer-proxy.js
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@ -67,20 +67,32 @@ class TemplateRendererProxy {
_loadFrame(frame, url, timeout=5000) {
return new Promise((resolve, reject) => {
let state = 0x0; // 0x1 = frame added; 0x2 = frame loaded; 0x4 = frame ready
const cleanup = () => {
frame.removeEventListener('load', onLoad, false);
window.removeEventListener('message', onWindowMessage, false);
if (timer !== null) {
clearTimeout(timer);
timer = null;
}
};
const updateState = (flags) => {
state |= flags;
if (state !== 0x7) { return; }
cleanup();
resolve();
};
const onLoad = () => {
if ((state & 0x3) !== 0x1) { return; }
updateState(0x2);
};
const onWindowMessage = (e) => {
if ((state & 0x5) !== 0x1) { return; }
const frameWindow = frame.contentWindow;
if (frameWindow === null || frameWindow !== e.source) { return; }
const {data} = e;
if (!(typeof data === 'object' && data !== null && data.action === 'ready')) { return; }
cleanup();
resolve();
updateState(0x4);
};
let timer = setTimeout(() => {
@ -91,9 +103,11 @@ class TemplateRendererProxy {
frame.removeAttribute('src');
frame.removeAttribute('srcdoc');
frame.addEventListener('load', onLoad, false);
window.addEventListener('message', onWindowMessage, false);
try {
document.body.appendChild(frame);
state = 0x1;
frame.contentDocument.location.href = url;
} catch (e) {
cleanup();