javascript - 如何在边栏中加载远程 URL

Question

我正在使用下一个代码来注入(inject)侧边栏。 https://github.com/curtislacy/inject-sidebar

function handleRequest(
        //The object data with the request params
        request, 
        //These last two ones isn't important for this example, if you want know more about it visit: http://code.google.com/chrome/extensions/messaging.html
        sender, sendResponse
        ) {
        if (request.callFunction == "toggleSidebar")
                toggleSidebar();
}
chrome.extension.onRequest.addListener(handleRequest);

/*Small function wich create a sidebar(just to illustrate my point)*/
var sidebarOpen = false;
function toggleSidebar() {
        if(sidebarOpen) {
                var el = document.getElementById('mySidebar');
                el.parentNode.removeChild(el);
                sidebarOpen = false;
        }
        else {
                var sidebar = document.createElement('div');
                sidebar.id = "mySidebar";
                sidebar.innerHTML = "\
                        <h1>Hello</h1>\
                        World!\
                ";
                sidebar.style.cssText = "\
                        position:fixed;\
                        top:0px;\
                        left:0px;\
                        width:30%;\
                        height:100%;\
                        background:white;\
                        box-shadow:inset 0 0 1em black;\
                        z-index:999999;\
                ";
                document.body.appendChild(sidebar);
                sidebarOpen = true;
        }
}

如何在边栏中加载远程 URL 而不是使用 innerHTML？(对 JavaScript 非常陌生)

Answer 1

为了加载远程 URL，您必须使用 iframe。但请记住，远程网页必须允许这样做(许多网页不允许)。

这是一个示例扩展，它有一个 brwoser-action，可以在事件选项卡中切换侧边栏。
侧边栏显示 http://www.cnn.com/。

在 manifest.json 中:

{
    "manifest_version": 2,
    "name":    "Test Extension",
    "version": "0.0",

    "background": {
        "persistent": false,
        "scripts":    ["./bg/background.js"]
    },

    "content_scripts": [{
        "matches":    ["*://*/*"],
        "js":         ["./fg/content.js"],
        "run_at":     "document_idle",
        "all_frames": false
    }],

    "browser_action": {
        "default_title": "Test Extension"
        //"default_icon": {
        //    "19": "img/icon19.png",
        //    "38": "img/icon38.png"
        //}
    }
}

在 background.js 中:

chrome.browserAction.onClicked.addListener(function(tab) {
    chrome.tabs.sendMessage(tab.id, { action: "toggleSidebar" });
});

在 content.js 中:

var sidebarURL = "http://www.cnn.com/";

var isSidebarOpen = false;
var sidebar = createSidebar();

/* Create a sidebar */
function createSidebar() {
    var sb = document.createElement("iframe");
    sb.id = "mySidebar";
    sb.src = sidebarURL;
    sb.style.cssText = ""
        + "border:   3px groove;\n"
        + "width:    30%;\n"
        + "height:   100%;\n"
        + "position: fixed;\n"
        + "top:      0px;\n"
        + "left:     0px;\n"
        + "z-index:  9999;\n"
        + "";
    return sb;
}

/* Show/Hide the SideBar */
function toggleSidebar() {
    if (isSidebarOpen) {
        document.body.removeChild(sidebar);
    } else {
        document.body.appendChild(sidebar);
    }
    isSidebarOpen = !isSidebarOpen;
}

/* Listen for message from the background-page and toggle the SideBar */
chrome.runtime.onMessage.addListener(function(msg) {
    if (msg.action && (msg.action == "toggleSidebar")) {
        toggleSidebar();
    }
});