Web Front-end
JS Tutorial
How to Prevent \'Unchecked runtime.lastError: The Message Port Closed...\' Errors in Chrome Extensions?
How to Prevent \'Unchecked runtime.lastError: The Message Port Closed...\' Errors in Chrome Extensions?
Nov 01, 2024 pm 02:37 PM
Unveiling the Culprit: Orphaned Scripts and Extension Updates
After accidentally reloading a Chrome extension, you might encounter a pesky error: "Unchecked runtime.lastError: The message port closed before a response was received." This error stems from the creation of orphaned scripts, which breaks communication between the popup and content pages.
Grasping the Orphaned Script Concept
An orphaned script is a ghostly remnant of a previously loaded extension that continues to linger even after the extension has been updated or reloaded. This ghost script intercepts messages intended for the new content script, leading to communication disruptions.
Eradicating Orphaned Scripts
To banish this spectral script, we must first ascertain whether it's still responsive. If it is, we can dispatch a message from the new content script via the window object. Upon receiving this message, the orphaned script should deregister all event listeners and prepare for garbage collection.
Replenishing Content Scripts on Reloading
To prevent this issue from recurring, we can check for the presence of a usable content script before sending messages from the popup page. If none exists, we can inject the content script again.
Sample Code for Content Script
To implement the aforementioned solution, incorporate this amended content.js script:
<code class="javascript">var orphanMessageId = chrome.runtime.id + 'orphanCheck';
window.dispatchEvent(new Event(orphanMessageId));
window.addEventListener(orphanMessageId, unregisterOrphan);
// ... (register named functions for event listeners)
window.running = true;
function unregisterOrphan() {
// ... (deregister listeners and nullify variables)
}
function onMessage(msg, sender, sendResponse) {
// ... (handle message)
}
function onMouseMove(event) {
// ... (DOM event handler)
}</code>
Popup Page Verification
To ensure a content script is injected before message transmission, enhance the popup.js script with this snippet:
<code class="javascript">async function sendMessage(data) {
// ... (fetch active tab)
if (await ensureContentScript(tab.id)) {
return await chrome.tabs.sendMessage(tab.id, data);
}
}
async function ensureContentScript(tabId) {
// ... (check for existing content script)
if (!result) {
await chrome.scripting.executeScript({
// ... (inject content script)
});
}
return true;
}</code>
By implementing these measures, you can exorcise orphaned scripts and maintain seamless communication between your extension's popup and content pages.
The above is the detailed content of How to Prevent \'Unchecked runtime.lastError: The Message Port Closed...\' Errors in Chrome Extensions?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java vs. JavaScript: Clearing Up the Confusion
Jun 20, 2025 am 12:27 AM
Java and JavaScript are different programming languages, each suitable for different application scenarios. Java is used for large enterprise and mobile application development, while JavaScript is mainly used for web page development.
How to work with dates and times in js?
Jul 01, 2025 am 01:27 AM
The following points should be noted when processing dates and time in JavaScript: 1. There are many ways to create Date objects. It is recommended to use ISO format strings to ensure compatibility; 2. Get and set time information can be obtained and set methods, and note that the month starts from 0; 3. Manually formatting dates requires strings, and third-party libraries can also be used; 4. It is recommended to use libraries that support time zones, such as Luxon. Mastering these key points can effectively avoid common mistakes.
Why should you place tags at the bottom of the ?
Jul 02, 2025 am 01:22 AM
PlacingtagsatthebottomofablogpostorwebpageservespracticalpurposesforSEO,userexperience,anddesign.1.IthelpswithSEObyallowingsearchenginestoaccesskeyword-relevanttagswithoutclutteringthemaincontent.2.Itimprovesuserexperiencebykeepingthefocusonthearticl
JavaScript vs. Java: A Comprehensive Comparison for Developers
Jun 20, 2025 am 12:21 AM
JavaScriptispreferredforwebdevelopment,whileJavaisbetterforlarge-scalebackendsystemsandAndroidapps.1)JavaScriptexcelsincreatinginteractivewebexperienceswithitsdynamicnatureandDOMmanipulation.2)Javaoffersstrongtypingandobject-orientedfeatures,idealfor
What is event bubbling and capturing in the DOM?
Jul 02, 2025 am 01:19 AM
Event capture and bubble are two stages of event propagation in DOM. Capture is from the top layer to the target element, and bubble is from the target element to the top layer. 1. Event capture is implemented by setting the useCapture parameter of addEventListener to true; 2. Event bubble is the default behavior, useCapture is set to false or omitted; 3. Event propagation can be used to prevent event propagation; 4. Event bubbling supports event delegation to improve dynamic content processing efficiency; 5. Capture can be used to intercept events in advance, such as logging or error processing. Understanding these two phases helps to accurately control the timing and how JavaScript responds to user operations.
JavaScript: Exploring Data Types for Efficient Coding
Jun 20, 2025 am 12:46 AM
JavaScripthassevenfundamentaldatatypes:number,string,boolean,undefined,null,object,andsymbol.1)Numbersuseadouble-precisionformat,usefulforwidevaluerangesbutbecautiouswithfloating-pointarithmetic.2)Stringsareimmutable,useefficientconcatenationmethodsf
How can you reduce the payload size of a JavaScript application?
Jun 26, 2025 am 12:54 AM
If JavaScript applications load slowly and have poor performance, the problem is that the payload is too large. Solutions include: 1. Use code splitting (CodeSplitting), split the large bundle into multiple small files through React.lazy() or build tools, and load it as needed to reduce the first download; 2. Remove unused code (TreeShaking), use the ES6 module mechanism to clear "dead code" to ensure that the introduced libraries support this feature; 3. Compress and merge resource files, enable Gzip/Brotli and Terser to compress JS, reasonably merge files and optimize static resources; 4. Replace heavy-duty dependencies and choose lightweight libraries such as day.js and fetch
A definitive JS roundup on JavaScript modules: ES Modules vs CommonJS
Jul 02, 2025 am 01:28 AM
The main difference between ES module and CommonJS is the loading method and usage scenario. 1.CommonJS is synchronously loaded, suitable for Node.js server-side environment; 2.ES module is asynchronously loaded, suitable for network environments such as browsers; 3. Syntax, ES module uses import/export and must be located in the top-level scope, while CommonJS uses require/module.exports, which can be called dynamically at runtime; 4.CommonJS is widely used in old versions of Node.js and libraries that rely on it such as Express, while ES modules are suitable for modern front-end frameworks and Node.jsv14; 5. Although it can be mixed, it can easily cause problems.
