Chrome 扩展:内容脚本和 background.html 之间的通信 [英] Chrome extension: Communication between content script and background.html
问题描述
我是 Chrome 扩展程序的新手.我正在尝试在内容脚本和 background.html 页面之间进行通信.background.html 向内容脚本发送请求hello"，内容脚本应以hello background"警报响应.但它只是没有发生.我的 background.html 代码是:
I am new to Chrome extensions. I am trying to communicate between the content script and the background.html page. The background.html sends a request, "hello", to the content script and the content script should respond back with "hello background" alert. But it's just not happening. My background.html code is:
function testRequest() {
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendRequest(tab.id, {greeting: "hello"});
});
}
content.js 代码:
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
if (request.greeting == "hello")
alert("hello background");
}
);
popup.html 代码:
<!doctype html>
<html>
<head></head>
<body>
<form>
<input type="button" value="sendMessage" onclick="testRequest()" />
</form>
</body>
</html>
manifest.json:
{
"browser_action": {
"default_icon": "icon.png",
"popup": "popup.html"
},
"background": {
"page": "background.html"
},
"permissions": [
"tabs",
"http://*/*",
"https://*/*",
"notifications",
"contextMenus"
],
"content_scripts": [
{
"matches": ["http://*/*","https://*/*"],
"js": ["content.js"]
}
],
"name": "FirstExtension",
"version": "1.0"
}
请帮忙！
推荐答案
sendRequest/onRequest 替换为 sendMessage/onMessage 在 Chrome 20 中.*Message 不仅仅是 *Request 的别名，它是一个不同的 API.
sendRequest/onRequest is replaced with sendMessage/onMessage in Chrome 20. *Message is not just an alias for *Request, it's a different API.
如果你想支持 Chrome <20(很多 Ubuntu 用户还在 Chromium 18，因为 PPA 没有更新)，使用 onRequest 和 sendRequest.否则，使用 *Message 方法.
If you want to support Chrome <20 (many Ubuntu users are still at Chromium 18, because the PPA is not updated), use onRequest and sendRequest. Otherwise, use the *Message methods.
还有一个问题是你的函数位于后台页面，调用是在弹窗中进行的.这些是不同的范围，如果您想从弹出窗口调用后台页面方法，请使用 chrome.extension.getBackgroundPage():
Another problem is that your function is located in the background page, and the call is made in the pop-up. These are different scopes, if you want to call a background page method from the popup, use chrome.extension.getBackgroundPage():
chrome.extension.getBackgroundPage().testRequest();
最后一点:您使用的是清单版本 1 和内联事件处理程序.此做法已弃用，有关详细信息，请参阅 http://code.google.com/chrome/extensions/manifestVersion.html.
Final note: You're using manifest version 1 and inline event handlers. This practice is deprecated, for more information, see http://code.google.com/chrome/extensions/manifestVersion.html.
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