Chrome扩展程序：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。我试图在内容脚本和 background.html 页面之间进行通信。 background.html 向内容脚本发送一个请求 hello ，内容脚本应该以 hello background 提醒作为回应。但这只是没有发生。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 code：
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 ：
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"
}
请帮助！
Please help!
推荐答案
sendRequest / onRequest 被替换为 sendMessage / onMessage 。 * Message 不仅仅是的请求，这是一个不同的nt API。
sendRequest/onRequest is replaced with sendMessage/onMessage in Chrome 20. *Message is not just an alias for *Request, it's a different API.
如果您要支持Chrome< 20（许多Ubuntu用户仍在Chromium 18上，因为PPA未更新），请使用 onRequest 和 sendRequest 。否则，请使用 * 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.
另一个问题是您的功能位于后台页面，并在弹出窗口中进行调用。这些是不同的范围，如果您想从弹出窗口调用背景页面方法，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();
最后说明：您正在使用清单版本1和内联事件处理程序。此做法已弃用，有关更多信息，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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