javascript 内容脚本：未捕获的类型错误：无法读取未定义的属性“onRequest”
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Content Script: Uncaught TypeError: Cannot read property 'onRequest' of undefined
提问by Nick Fury
I've been searching all over SO and reading through google docs but I can't seem to find a solution.
我一直在到处搜索并阅读谷歌文档，但我似乎找不到解决方案。
My Chrome extension is injecting a content script and I want to set an onRequest.listenerin order to sendRequests to the content script. This is the scriptI used to for the onRequest.listener. The problem is I keep getting this error for some unknown reason.
我的 Chrome 扩展程序正在注入一个内容脚本，我想设置一个onRequest.listener以便向内容脚本发送请求。这是脚本用来为我onRequest.listener。问题是我由于某些未知原因不断收到此错误。
Error Message:
错误信息：
Uncaught TypeError: Cannot ready property 'onRequest' of undefined
Uncaught TypeError: Cannot ready property 'onRequest' of undefined
contentscript.js line 1;
contentscript.js line 1;
Here's the relevant code...
这是相关的代码...
Manifest.json
清单文件.json
{
"name": "Injector Extension",
"version": "1.0",
"manifest_version": 1,
"icons": { "128": "icon.png" },
"browser_action": {
"default_icon": "icon.png",
"default_title": "Injector Extension",
"default_popup": "popup.html"
},
"options_page": "options.html",
"background": {
"page": "background.html"
},
"permissions": [
"tabs",
"http://*/*",
"https://*/*",
"unlimitedStorage"],
"content_scripts": [{
"matches": [" (injector specific url) "],
"js": ["contentscript.js"]
}],
"web_accessible_resources": ["js/script.js"]
}
content script
内容脚本
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
if (request.method == "fromPopup") {
// Send JSON data back to Popup.
sendResponse({data: "from Content Script to Popup"});
} else {
sendResponse({}); // snub them.
}
});
popup
弹出
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendRequest(tab.id, {method: "fromPopup", tabid: tab.id}, function(response) {
console.log(response.data);
});
});
回答by Silviu-Marian
chrome.extension.onRequest.addListenerworks only in extension context. It won't run inside a content script.
chrome.extension.onRequest.addListener仅适用于扩展上下文。它不会在内容脚本中运行。
chrome.extension.sendRequestworks in content script context
chrome.extension.sendRequest在内容脚本上下文中工作
Update accordingly and will work.
相应地更新并将工作。
Edit: Exemplifying simple message passing:
编辑：举例说明简单的消息传递：
Extension script:
扩展脚本：
chrome.extension.onRequest.addListener(function(r,s,sr){
if(r==='HELLO') return sr.call(this,'BACK AT YOU');
});
Content script:
内容脚本：
chrome.extension.sendRequest('HELLO', function(data){ alert(data); });
// will alert "BACK AT YOU"
