我需要能够将Chrome应用程序中的postMessage通过webview发送到主页并返回。
我已经将Chrome应用程序中的PostMessage建立到主页，并且主页也捕获了PostMessage，并且发回了新的PostMessage，但Chrome应用程序未捕获此PostMessage回复。
我可以看到Chrome-App API上有可能：
访客将能够通过在收到的消息事件上向event.source发送消息来向嵌入者发送回复。
所以问题是我无法让Chrome应用程序从主页上收到回复，即使我使用event.source.postMessage（''，event.origin）发送回复。 是window.addEventListener（'message'，messageHandler，false）; 在background.js结尾错了？
我在下面包含了我的代码：
background.js （初始化Chrome应用）：
var myAppWin = null;
var webview = null;
chrome.app.runtime.onLaunched.addListener(function() {
// Center window on screen.
var screenWidth = screen.availWidth/2;
var screenHeight = screen.availHeight;
var chromeWindow = chrome.app.window.create('webview-embed.html', {
id: "helloWorldID",
bounds: {
width: screenWidth,
height: screenHeight,
}
}, function(win) {
myAppWin = win;
myAppWin.contentWindow.addEventListener('DOMContentLoaded', function() {
webview = myAppWin.contentWindow.document.getElementById('webview');
try{
webview.addEventListener("contentload", function () {
console.log("webview content is now loaded");
try{
console.log("Trying to post message");
webview.contentWindow.postMessage("Message from Chrome APP!", "*");
}catch(error){
console.log("postMessage error: " + error);
}
});
}
catch(err) {
console.log("Webview error: " + err);
}
});
});
//Event listnener for the PostMessage reply
var messageHandler = function(event) {
console.log("got message from page back: " + event.data);
};
window.addEventListener('message', messageHandler, false);
});
webview-embed.html （带有webview标签的html文件）：
<!DOCTYPE html>
<head>
<title>webview</title>
</head>
<body style='margin:0;padding:0;' >
<webview src="http://localhost" style="width:100%;height:100%;" id="webview" ></webview>
</body>
</html>
index.html （网络上的主页，需要捕获第一个PostMessage并将回复发送回Chrome-app）：
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>title</title>
</head>
<body >
<div id="wrapper" >
//body
</div>
//Used to catch messages from the Chrome App and reply back
var messageHandler = function(event) {
console.log('Message received fom APP!');
try{
console.log(event);
event.source.postMessage("Message from page", event.origin);
console.log("Sent massage back to APP");
}catch(error){
console.log("Error on postMessage back to APP" + error);
}
};
window.addEventListener('message', messageHandler, false);
</script>
</body>
</html>
感谢您的投入。 找到了解决方案！
我制作了一个webview.js并将其加载到webview-embed.html中
var messageHandler = function(event) {
console.log("Got message from webpage back: " + event.data);
};
webview = document.getElementById('webview');
webview.addEventListener("contentload", function () {
try{
console.log("Trying to post message");
webview.contentWindow.postMessage("Message from Chrome APP!", "*");
}catch(error){
console.log("postMessage error: " + error);
}
});
window.addEventListener('message', messageHandler, false);
清理了我的background.js
chrome.app.runtime.onLaunched.addListener(function() {
// Center window on screen.
var screenWidth = screen.availWidth;
var screenHeight = screen.availHeight;
var chromeWindow = chrome.app.window.create('webview-embed.html', {
id: "helloWorldID",
bounds: {
width: screenWidth,
height: screenHeight,
}
});
});
和网站上的index.html：
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>title</title>
</head>
<body >
<div id="wrapper" >
//body
</div>
<script>
var messageHandler = function(event) {
console.log('Message received fom APP!');
try {
event.source.postMessage("Message from webpage", "*");
console.log('message send back to get catched by webview');
} catch(error) {
console.log("Error on postMessage back to APP" + error);
}
};
window.addEventListener('message', messageHandler, false);
</script>
</body>
</html>