kiwix/kiwix-js-pwa
1
0
Fork 0
mirror of https://github.com/kiwix/kiwix-js-pwa.git synced 2025-09-09 04:06:27 -04:00
Code Issues Packages Projects Releases Wiki Activity

Fix article display race condition #634 (#636)

Browse Source
This commit is contained in:
Jaifroid 2024-08-11 14:35:08 +01:00 committed by GitHub
parent faa729cd62
commit ba01555e5d
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 72 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
www/article.html
View File

@ -5,6 +5,7 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: blob: file: about: chrome-extension: ms-appx-web: 'unsafe-inline' 'unsafe-eval';">
<meta name="description" content="Placeholder for injecting an article into the iframe or window">
<link rel="icon" href="data:,">
</head>
<body></body>
</html>

91
www/js/app.js
View File

@ -4953,6 +4953,7 @@ function readArticle (dirEntry) {
appstate.expectedArticleURLToBeDisplayed = dirEntry.namespace + '/' + dirEntry.url;
params.pagesLoaded++;
// We must remove focus from UI elements in order to deselect whichever one was clicked (in both Restricted and SW modes),
articleContainer = articleContainer || articleWindow;
if (!params.isLandingPage && articleContainer.contentWindow) articleContainer.contentWindow.focus();
uiUtil.pollSpinner()
// Show the spinner with a loading message
@ -5228,7 +5229,7 @@ function articleLoader (entry, mimeType) {
// Add event listener to iframe window to check for links to external resources
function filterClickEvent (event) {
// console.debug('filterClickEvent fired');
console.debug('filterClickEvent fired');
// Ignore click if we are dealing with an image that has not yet been extracted
if (event.target.dataset && event.target.dataset.kiwixhidden) return;
// Find the closest enclosing A tag (if any)
@ -5244,6 +5245,10 @@ function filterClickEvent (event) {
// Trap clicks in the iframe to restore Fullscreen mode
if (params.lockDisplayOrientation) refreshFullScreen(event);
if (clickedAnchor) {
// Get the window of the clicked anchor
articleWindow = clickedAnchor.ownerDocument.defaultView;
// Determine if the window is in an iframe
articleContainer = (articleWindow.self !== articleWindow.top) ? window.frames[0] : articleWindow;
// This prevents any popover from being displayed when the user clicks on a link
clickedAnchor.articleisloading = true;
// Check for Zimit links that would normally be handled by the Replay Worker
@ -5279,24 +5284,58 @@ function filterClickEvent (event) {
var decHref = decodeURIComponent(href);
if (!/^(?:#|javascript)/i.test(decHref)) {
uiUtil.pollSpinner('Loading ' + decHref.replace(/([^/]+)$/, '$1').substring(0, 18) + '...');
// uiUtil.showSlidingUIElements();
// Tear down contents of previous document -- this is needed when a link in a ZIM link in an external window hasn't had
// an event listener attached. For example, licks in popovers in external windows.
if (articleWindow && articleWindow.document && articleWindow.document.body) {
articleWindow.document.body.innerHTML = '';
}
}
}
}
};
var loaded = false;
var unhideArticleTries = 12; // Set up a repeasting loop 12 times (= 6 seconds max) to attempt to unhide the article container
// Function to unhide a hidden article
var unhideArticleContainer = function () {
console.debug('Unhiding article container...');
if (articleWindow.document) {
articleWindow.document.bgcolor = '';
if (appstate.target === 'iframe') iframe.style.display = '';
if (articleWindow.document.body && articleWindow.document.body.style) {
articleWindow.document.body.style.display = 'block';
// Some contents need this to be able to display correctly (e.g. masonry landing pages)
iframe.style.height = 'auto';
resizeIFrame();
// Scroll down and up to kickstart lazy loading which might not happen if brower has been slow to display the content
articleWindow.scrollBy(0, 5);
setTimeout(function () {
articleWindow.scrollBy(0, -5);
unhideArticleTries = 12; // Reset counter
}, 250);
}
}
}
// The main article loader for Service Worker mode
var articleLoadedSW = function (dirEntry, container) {
if (loaded) return;
console.debug('Checking if article loaded... ' + loaded);
if (loaded) {
// Last-ditch attempt to unhide
unhideArticleContainer();
return;
}
loaded = true;
// Get the container windows
var articleWindow = container.contentWindow || container;
articleWindow = container.contentWindow || container;
uiUtil.showSlidingUIElements();
var doc = articleWindow ? articleWindow.document : null;
articleDocument = doc;
var mimeType = dirEntry.getMimetype();
// If we've successfully loaded an HTML document...
if (doc && /\bx?html/i.test(mimeType)) {
console.debug('HTML appears to be available...');
if (params.rememberLastPage) {
params.lastPageVisit = dirEntry.namespace + '/' + dirEntry.url + '@kiwixKey@' + appstate.selectedArchive.file.name;
} else {
@ -5310,7 +5349,8 @@ var articleLoadedSW = function (dirEntry, container) {
settingsStore.setItem(appstate.selectedArchive.file.name, lastPage, Infinity);
}
var docBody = doc ? doc.body : null;
if (docBody) {
if (docBody && docBody.innerHTML) { // docBody must contain contents, otherwise we haven't loaded an article yet
console.debug('We appear to have a document body with HTML...');
// Trap clicks in the iframe to enable us to work around the sandbox when opening external links and PDFs
articleWindow.onclick = filterClickEvent;
// Ensure the window target is permanently stored as a property of the articleWindow (since appstate.target can change)
@ -5363,14 +5403,17 @@ var articleLoadedSW = function (dirEntry, container) {
if (/UWP/.test(params.appType)) docBody.addEventListener('pointerup', onPointerUp);
// The content is ready : we can hide the spinner
setTab();
setTimeout(function () {
doc.bgcolor = '';
if (appstate.target === 'iframe') container.style.display = '';
docBody.style.display = 'block';
// Some contents need this to be able to display correctly (e.g. masonry landing pages)
iframe.style.height = 'auto';
resizeIFrame();
}, 200);
// If the body is not yet displayed, we need to wait for it to be displayed before we can unhide the article container
const intervalId = setInterval(function () {
docBody = articleWindow.document.body;
unhideArticleTries--;
unhideArticleContainer();
// Check that the contents of docBody aren't empty and that the unhiding worked
if (unhideArticleTries < 1 || docBody.innerHTML && docBody.style.display === 'block') {
console.debug('Attempt ' + (12 - unhideArticleTries) + ' to unhide article container...');
clearInterval(intervalId);
}
}, 500);
}
uiUtil.clearSpinner();
// If we reloaded the page to print the desktop style, we need to return to the printIntercept dialogue
@ -5391,11 +5434,13 @@ var articleLoadedSW = function (dirEntry, container) {
popovers.attachKiwixPopoverCss(doc, darkTheme);
}
params.isLandingPage = false;
} else {
} else if (unhideArticleTries > 0) {
// If we havent' loaded a text-type document, we probably haven't finished loading
if (!/^text\//i.test(mimeType)) {
loaded = false;
}
loaded = false;
unhideArticleTries--;
// Try again...
console.debug('Attempt ' + (12 - unhideArticleTries) + ' to process loaded article...');
setTimeout(articleLoadedSW, 250, dirEntry, container);
}
// Show spinner when the article unloads
@ -6102,6 +6147,9 @@ function displayArticleContentInContainer (dirEntry, htmlArticle) {
htmlArticle = htmlArticle.replace(/<script\b[^>]+-\/(j\/js_modules\/)?script\.js"[^<]*<\/script>/i, '');
}
// Add a fake favicon to prevent the browser making a useless search for one
if (!/<link\s[^>]*rel=["']icon["']/.test(htmlArticle)) htmlArticle = htmlArticle.replace(/(<head\b[^>]*>)(\s*)/i, '$1<link rel="icon" href="data:,">$2');
// Gutenberg ZIMs try to initialize before all assets are fully loaded. Affect UWP app.
htmlArticle = htmlArticle.replace(/(<body\s[^<]*onload=(['"]))([^'"]*init\([^'"]+showBooks\([^'"]+)\2/i, '$1setTimeout(function () {$3}, 300);$2');
@ -6599,8 +6647,7 @@ function displayArticleContentInContainer (dirEntry, htmlArticle) {
setTab();
checkToolbar();
// Show the article
articleDocument.bgcolor = '';
docBody.style.display = 'block';
unhideArticleContainer();
// Jump to any anchor parameter
if (anchorParameter) {
var target = articleWindow.document.getElementById(anchorParameter);
@ -6619,7 +6666,7 @@ function displayArticleContentInContainer (dirEntry, htmlArticle) {
// Hide the document to avoid display flash before stylesheets are loaded; also improves performance during loading of
// assets in most browsers
// DEV: We cannot do `articleWindow.document.documentElement.hidden = true;` because documentElement gets overwritten
// during the document.write() process; and since the latter is synchronous, we get slow display rewrites before it is
// during the document.write() process (if used); and since the latter is synchronous, we get slow display rewrites before it is
// effective if we do it after document.close().
// Note that UWP apps cannot communicate to a newly opened window except via postmessage, but Service Worker can still
// control the Window. Additionally, Edge Legacy cannot build the DOM for a completely hidden document, hence we catch
@ -6940,6 +6987,10 @@ function addListenersToLink (a, href, baseUrl) {
// @TODO: We are getting double activations of the click event. This needs debugging. For now, we use a flag to prevent this.
a.newcontainer = true; // Prevents double activation
// uiUtil.showSlidingUIElements();
// Tear down contents of articleWindow.document
if (articleWindow && articleWindow.document && articleWindow.document.body) {
articleWindow.document.body.innerHTML = '';
}
goToArticle(zimUrl, downloadAttrValue, contentType, zimUrlFullEncoding);
setTimeout(reset, 1400);
};