145d235094
When the error handler itself causes an exception, it falls back to a
simple document.write(). This means the proper error dialog isn't shown
when this happens.
The focus changes that were added to the error handler in e1f8232b are
not crucial for its function. If these focus changes causes an exception
we can just ignore that.
80 lines
2.6 KiB
JavaScript
80 lines
2.6 KiB
JavaScript
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2019 The noVNC Authors
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* Licensed under MPL 2.0 (see LICENSE.txt)
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*
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* See README.md for usage and integration instructions.
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*/
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// Fallback for all uncought errors
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function handleError(event, err) {
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try {
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const msg = document.getElementById('noVNC_fallback_errormsg');
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// Work around Firefox bug:
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// https://bugzilla.mozilla.org/show_bug.cgi?id=1685038
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if (event.message === "ResizeObserver loop completed with undelivered notifications.") {
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return false;
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}
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// Only show the initial error
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if (msg.hasChildNodes()) {
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return false;
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}
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let div = document.createElement("div");
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div.classList.add('noVNC_message');
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div.appendChild(document.createTextNode(event.message));
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msg.appendChild(div);
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if (event.filename) {
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div = document.createElement("div");
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div.className = 'noVNC_location';
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let text = event.filename;
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if (event.lineno !== undefined) {
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text += ":" + event.lineno;
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if (event.colno !== undefined) {
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text += ":" + event.colno;
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}
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}
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div.appendChild(document.createTextNode(text));
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msg.appendChild(div);
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}
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if (err && err.stack) {
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div = document.createElement("div");
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div.className = 'noVNC_stack';
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div.appendChild(document.createTextNode(err.stack));
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msg.appendChild(div);
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}
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document.getElementById('noVNC_fallback_error')
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.classList.add("noVNC_open");
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} catch (exc) {
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document.write("noVNC encountered an error.");
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}
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// Try to disable keyboard interaction, best effort
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try {
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// Remove focus from the currently focused element in order to
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// prevent keyboard interaction from continuing
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if (document.activeElement) { document.activeElement.blur(); }
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// Don't let any element be focusable when showing the error
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let keyboardFocusable = 'a[href], button, input, textarea, select, details, [tabindex]';
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document.querySelectorAll(keyboardFocusable).forEach((elem) => {
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elem.setAttribute("tabindex", "-1");
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});
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} catch (exc) {
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// Do nothing
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}
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// Don't return true since this would prevent the error
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// from being printed to the browser console.
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return false;
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}
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window.addEventListener('error', evt => handleError(evt, evt.error));
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window.addEventListener('unhandledrejection', evt => handleError(evt.reason, evt.reason));
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