全双工通信

Question

来自popup.js的消息被发送两次到background.js，但我从background.js中得到的一切都没有。

background.js

function login(username,password){

    console.log(username);
var xhr = new XMLHttpRequest();

xhr.open("POST", "http://localhost:3000/login/", true);
xhr.setRequestHeader('Content-type','application/json; charset=utf-8');
data = {"username":username,"password":password};
console.log(JSON.stringify(data));
xhr.send(JSON.stringify(data));
xhr.onreadystatechange = function() {
  if (xhr.readyState == 4) {
    // JSON.parse does not evaluate the attacker's scripts.
    var resp = JSON.parse(xhr.responseText);
    console.log(resp);
    var lStorage = localStorage;
    localStorage.setItem("username",resp["username"]);
    localStorage.setItem("apiKey",resp["apiKey"]);
    localStorage.setItem("password",resp["password"]);
    console.log(localStorage.getItem("username"));



  }
};


}


chrome.extension.onRequest.addListener(
    function(request, sender, sendResponse){
        console.log("hello");
        if(request.msg == "login") {
            //alert(request.password);
            login(request.username,request.password);}
    }
);

  chrome.extension.onConnect.addListener(function(port) {
  console.log("Connected .....");
  port.onMessage.addListener(function(msg) {
        console.log("message recieved "+ msg);
        port.postMessage("Hi Popup.js");
  });
});

popup.js：

function login(){
alert(document.login.username.value);
chrome.extension.sendRequest({ msg: "login",username:document.login.username.value,password:document.login.password.value});
document.getElementById('openBackgroundWindow').visbility = "hidden";

}

$(document).ready(function (){

checkUserAuth();
console.log("Inside");
$("#openBackgroundWindow").click(login);

});


function checkUserAuth(){
console.log(localStorage.getItem("apiKey"));
if(localStorage.getItem("apiKey") != null)
    {
        $("#openBackgroundWindow").visbility ="hidden";
    }
}


var port = chrome.extension.connect({name: "Sample Communication"});
port.postMessage("Hi BackGround");
port.onMessage.addListener(function(msg) {
        console.log("message recieved"+ msg);
});

Answer 1

方法 - 答：
使用Long Lived Connections 您可以从background.js与扩展页面的popup.js进行通信对于任何活动（这里我已经将popup.js中的popup.html和only initiated示例通信作为示例包含在内）

<强> background.js

 chrome.extension.onConnect.addListener(function(port) {
      console.log("Connected .....");
      port.onMessage.addListener(function(msg) {
           console.log("message recieved" + msg);
           port.postMessage("Hi Popup.js");
      });
 })

<强> popup.js

 var port = chrome.extension.connect({
      name: "Sample Communication"
 });
 port.postMessage("Hi BackGround");
 port.onMessage.addListener(function(msg) {
      console.log("message recieved" + msg);
 });

方法 - B：
直接操作DOM *如果您的最终结果是修改DOM，您可以用此实现

<强> popup.html

<html>
    <head>
        <script src="popup.js"></script>
    </head>
    <body>
        <div id="x" value="m">Some thing</div>
    </body>
</html>

<强> background.js

var views = chrome.extension.getViews({
    type: "popup"
});
for (var i = 0; i < views.length; i++) {
    views[i].document.getElementById('x').innerHTML = "My Custom Value";
}

方法 - C：

使用Long Lived Connections 您可以从background.js传播到任何活动的扩展页面的popup.js（这里我没有包含popup.html并从background.js启动了示例通信; < / p>

<强> background.js

chrome.browserAction.onClicked.addListener(function(tab) {

    var port = chrome.extension.connect({
        name: "Sample Communication"
    });
    port.postMessage("Hi BackGround");
    port.onMessage.addListener(function(msg) {
        console.log("message recieved" + msg);
    });

});

我已经更改了你的代码，并在删除了一些东西并使其成为简单版本后使其运行。 在此框架上添加AJAX请求和HTML DOM的代码（确保在head部分添加<script>标记，并将chrome.extension.onConnect.addListener放在(xhr.readyState == 4)代码之外;）

<强> popup.html

<html >
    <head>
        <script src="popup.js"></script>
    </head>
    <body></body>
</html>

<强> 的manifest.json

{
    "name": "Demo",
    "version": "1.0",
    "manifest_version": 2,
    "description": "This is a demo",
    "browser_action": {
        "default_popup": "popup.html"
    },
    "background": {
        "scripts": ["background.js"]
    },
    "permissions": ["<all_urls>",
        "storage",
        "tabs"
    ]
}

<强> background.js

chrome.extension.onConnect.addListener(function(port) {
    console.log("Connected .....");
    port.onMessage.addListener(function(msg) {
        console.log("message recieved " + msg);
        port.postMessage("Hi Popup.js");
    });
});

<强> popup.js

var port = chrome.extension.connect({
    name: "Sample Communication"
});
port.postMessage("Hi BackGround");
port.onMessage.addListener(function(msg) {
    console.log("message recieved" + msg);
});

Answer 2

这可以用于双向通信。两个文件都有相同的代码。

popup.js＆amp; background.js

//for sending a message chrome.runtime.sendMessage({greeting: "hello"}, function(response) { }); //for listening any message which comes from runtime chrome.runtime.onMessage.addListener(messageReceived); function messageReceived(msg) { // Do your work here }

参考：https://developer.chrome.com/extensions/runtime#method-sendMessage

Answer 3

全双工通信

从background.js异步调用popup.js个方法并获取回复：

<强> Popup.js：

// wrapper method 
function getContent() {
    callEventPageMethod('getContent', 'some parameter', function (response) {
        doSomethingWith(response);
    });

}

//generic method
function callEventPageMethod(method, data, callback) {
    chrome.runtime.sendMessage({ method: method, data: data }, function (response) {
        if(typeof callback === "function") callback(response);
    });
}

Background.js / eventPage.js：

chrome.runtime.onMessage.addListener(callback);
function callback(obj, sender, sendResponse) {
    if (obj) {
        if (obj.method == 'getContent') {
            getContent(sendResponse);
        } else if (obj.method == 'othermethod') {

        }
    }
    return true; // remove this line to make the call sync!
}


//some async method
function getContent(sendResponse) {
    chrome.storage.local.get(["mydata"], function (obj) {
        var mydata = $.trim(obj["mydata"]);
        sendResponse(mydata);
    });
}

如果需要从 background.js 调用 popup.js 方法，请在文件中交换上述代码。

方法2： 您可以在变量中加载背景页面的引用并访问所有方法。

var bgPage = chrome.extension.getBackgroundPage();
 var response =  bgPage.someMethodInBGPage();

如何在chrome扩展中的popup.js和background.js之间进行通信？

3 个答案:

全双工通信