请原谅我的任何明显错误,因为我是 Chrome 扩展的新手,但 Chrome 消息传递 API 的这个错误已经讨论过 here , here ,和here过去,常见的 react 是“禁用现有的 Chrome 扩展,其中一个导致了错误”。 这是可以实现的最好结果吗?我们是否应该翻身并接受我们的扩展将与其他扩展冲突的事实? 返回 true 或为监听器回调函数返回 Promise 并使用 sendResponse
并不能解决我的问题。
目前我只能获取 chrome.storage.local
中存储的新值(没有错误)通过禁用所有其他 chrome 扩展、删除扩展并加载备份解压的扩展。有趣的是,该代码似乎只在developer.chrome.com上工作,它根本不起作用关于 manifest.json
中的其他“匹配”URL .
我认为await
有一定的意义。和async
运营商正在解决这个问题,但我不确定如何正确实现它。
manifest.json:
{
"manifest_version": 2,
"name": "my extension",
"version": "1.0",
"description": "its my extension",
"permissions": [
"declarativeContent",
"storage",
"activeTab"
],
"content_scripts": [
{
"matches": [
"*://developer.chrome.com/*",
"*://bbc.co.uk/*",
"*://theguardian.com/*",
"*://dailymail.co.uk/*"
],
"js": ["content.js"]
}
],
"background": {
"scripts": ["background.js"],
"persistent": false
},
"content_security_policy": "script-src 'self' https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js; object-src 'self'",
"page_action": {
"default_popup": "popup.html"
},
"icons": {
"16": "images/icon16.png",
"32": "images/icon32.png",
"48": "images/icon48.png",
"128": "images/icon128.png"
}
}
popup.html:
<!DOCTYPE html>
<html>
<head>
<title>my extension</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="popup.js"></script>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<h1>my extension</h1>
<h2>Article: <span id="article-headline"></span></h2>
<button id="detect-article">Detect Article</button>
</body>
</html>
popup.js:
$(document).ready(function() {
$("#detect-article").click(function() {
chrome.tabs.query({active: true, currentWindow: true}, function(tabs){
chrome.tabs.sendMessage(tabs[0].id, {request: "Requesting headline"}, function(response) {
console.log("Requesting headline")
});
});
});
})
function getHeadline(changes) {
let changedValues = Object.keys(changes);
//console.log(changedValues);
for (var item of changedValues) {
console.log("new value: " + changes[item].newValue);
$("#article-headline").text(changes[item].newValue)
}
}
chrome.storage.onChanged.addListener(getHeadline);
content.js:
function handleRequest(message, sender, sendResponse) {
console.log("Request recieved");
let headlineList = document.getElementsByTagName("h1");
chrome.storage.local.set({headline: headlineList[0].innerText}, function() {
console.log("'" + headlineList[0].innerText + "' stored in local storage");
});
return true;
}
chrome.runtime.onMessage.addListener(handleRequest);
背景.js:
chrome.runtime.onInstalled.addListener(function() {
chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
chrome.declarativeContent.onPageChanged.addRules([{
conditions: [
new chrome.declarativeContent.PageStateMatcher({
pageUrl: { hostContains: 'developer.chrome.com' },
}),
new chrome.declarativeContent.PageStateMatcher({
pageUrl: { hostContains: 'bbc.co.uk' },
}),
new chrome.declarativeContent.PageStateMatcher({
pageUrl: { hostContains: 'theguardian.com' },
}),
new chrome.declarativeContent.PageStateMatcher({
pageUrl: { hostContains: 'dailymail.co.uk' },
}),
],
actions: [new chrome.declarativeContent.ShowPageAction()]
}]);
});
});
非常感谢您花时间查看/重新查看此问题,与上述“禁用现有扩展”相关的解决方案不是我正在寻找的。p>
最佳答案
当您为 sendMessage 指定回调时,您是在告诉 API 您需要响应,因此当您的内容脚本未使用 sendResponse 进行响应时,API 会认为发生了可怕的事情并进行报告!
Reminder: when editing content scripts make sure to reload both the extension on
chrome://extensions
page and the tabs that should have this content script.
如果您需要异步运行代码的响应,例如 chrome
API 回调:
保持
返回true
在回调中调用
sendResponse(someImportantData)
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => { chrome.storage.local.set({foo: 'bar'}, () => { sendResponse('whatever'); }); return true; });
与
Promise
相同,但不要对 onMessage 监听器使用async
,more info .chrome.runtime.onMessage.addListener((message, sender, sendResponse) => { fetch(message.url).then(r => r.text()) .then(t => sendResponse({ok: t})) .catch(e => sendResponse({err: e.message})); return true; });
如果您需要回复并且可以立即发送:
将
return true
替换为sendResponse
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => { sendResponse('whatever'); });
如果您不需要任何回复:
移除sendMessage中的回调
chrome.tabs.sendMessage(tabs[0].id, {request: "Requesting headline"});
删除
return true
- 它当前所做的只是告诉 API 无限期地保持消息传递端口打开,您永远不会使用该端口,因此它只是一个内存泄漏源。chrome.runtime.onMessage.addListener((message, sender, sendResponse) => { // do something // don't return true // ManifestV2: don't call sendResponse // ManifestV3 bug: uncomment the next line // sendResponse(); });
对于 ManifestV3 in Chrome 99, 100, 101您需要一个虚拟的 sendResponse() 调用。
关于javascript - 如何处理 "Unchecked runtime.lastError: The message port closed before a response was received"?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59914490/