是否可以确定第二个分机是否存在分机？
首先，有点背景知识：我有一个覆盖书签管理器的扩展程序。客户还需要一位历史经理，我知道这不能在一个扩展中完成。
我的建议是创建两个扩展，其中一个也充当“核心”，使用客户端的API处理身份验证。我已经让两个人在一起谈话了，auth工作正常，但我正在努力应对未安装核心扩展的情况。我想显示安装核心的提示，如果不存在的话。
我可以发送消息并捕获chrome.extension.lastError，但有更优雅的方式吗？
同样的消息在我想象中也是一个福音......
答案 0 :(得分：2)
使用Cross-extension messaging API将邮件从分机2发送到分机1.如果分机1没有响应，则可以提示用户安装分机1.我构建了两个Chrome扩展来测试这个想法，它工作得很好。
如果您想要下载并自行试用，请将以下文件压缩起来。以下是在YouTube http://youtu.be/6u4tIH6Xfcg
上显示工作示例的截屏视频{
"name": "Subordinate Chrome Extension Example",
"manifest_version": 2,
"version": "0.1",
"description": "This is an example extension for StackOverflow that requires a master/companion Google Chrome extension to be installed for it to work",
"browser_action": {
"default_popup": "popup.html"
},
"background": {
"scripts": ["background.js"]
}
}
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
switch (request.directive) {
case "popup-click":
// check to see if master extension 1 is installed
chrome.extension.sendMessage('jfhngkelgcildagdkgenelgaaaphlghb', {directive: "ping"}, function(extensionResponse) {
if (extensionResponse && extensionResponse.data == 'pong') {
console.log("The master extension 1 is installed!");
} else {
console.log("The master extension 1 is not installed");
}
sendResponse({});
});
return true; // required to return true if we want to sendResponse() later since the cross chrome extension message passing is asynchronus
break;
default:
// helps debug when request directive doesn't match
alert("Unmatched request of '" + request + "' from script to background.js from " + sender);
}
}
);
<html>
<head>
<script src="popup.js"></script>
<style type="text/css" media="screen">
body { min-width:250px; text-align: center; }
#click-me { font-size: 20px; }
</style>
</head>
<body>
<button id='click-me'>Click Me!</button>
</body>
</html>
function clickHandler(e) {
chrome.extension.sendMessage({directive: "popup-click"}, function(response) {
this.close(); // close the popup when the background finishes processing request
});
}
document.addEventListener('DOMContentLoaded', function () {
document.getElementById('click-me').addEventListener('click', clickHandler);
})
{
"name": "Master Chrome Extension Example",
"manifest_version": 2,
"version": "0.1",
"description": "This is an example extension for StackOverflow that is required for a subordinate/companion Google Chrome extension to work",
"background": {
"scripts": ["background.js"]
}
}
chrome.extension.onMessageExternal.addListener(function(request, sender, sendResponse) {
if (sender.id == 'ikofjngppooeeendkfenaiedmlmfjmkb') { // restricting cross extension api to known extension
if (request.directive == 'ping') {
sendResponse({
data: 'pong'
});
}
}
});