javascript Chrome 扩展程序 sendMessage
声明:本页面是StackOverFlow热门问题的中英对照翻译,遵循CC BY-SA 4.0协议,如果您需要使用它,必须同样遵循CC BY-SA许可,注明原文地址和作者信息,同时你必须将它归于原作者(不是我):StackOverFlow
原文地址: http://stackoverflow.com/questions/11531139/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Chrome extension sendMessage
提问by Tom B
The documentation here seems terrible: http://code.google.com/chrome/extensions/messaging.html
这里的文档看起来很糟糕:http: //code.google.com/chrome/extensions/messaging.html
I want my content script, simply to show a pageIcon if there is a textarea on the page.
我想要我的内容脚本,如果页面上有文本区域,只需显示一个 pageIcon。
My content.js (using jquery) does this:
我的 content.js(使用 jquery)这样做:
$('textarea').each(function() {
chrome.extension.sendMessage({greeting: "hello"}, function(response) {
console.log(response);
});
});
Then my background.js has this:
然后我的 background.js 有这个:
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
chrome.pageAction.show(sender.tab.id);
}
});
Which should be incredibly simple. If there's a textarea, show the icon.
这应该非常简单。如果有文本区域,则显示图标。
I have tried all kinds of variations from sample code and nothing works. All I ever get is:
我已经尝试了示例代码中的各种变体,但没有任何效果。我得到的只是:
Port error: Could not establish connection. Receiving end does not exist.
端口错误:无法建立连接。接收端不存在。
in the console.
在控制台中。
Any ideas where I'm going wrong?
任何想法我哪里出错了?
回答by ron
I think you have an extra curly bracket in the background script.
我认为您在后台脚本中有一个额外的大括号。
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
chrome.pageAction.show(sender.tab.id);
}
});
should be
应该
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
chrome.pageAction.show(sender.tab.id);
}
);