问题是,默认情况下,Web 视图不会让访客打开任意窗口。相反,它会发出一个“newwindow”事件,您可以拦截该事件并决定如何处理它。以一种不那么可怕的形式,这看起来像:
chrome.app.runtime.onLaunched.addListener(function() {
chrome.app.window.create(
'main.html',
{ 'width': 1000, 'height': 1000 },
function(win) {
win.contentWindow.onload = function() {
var webview = win.contentWindow.document.querySelector('#my_webview');
webview.addEventListener('newwindow', function(e) {
e.preventDefault();
// e.targetUrl contains the target URL of the original link click
// or window.open() call: use it to open your own window to it.
// Something to keep in mind: window.open() called from the
// app's event page is currently (Nov 2013) handicapped and buggy
// (e.g. it doesn't have access to local storage, including cookie
// store). You can try to use it here and below, but be prepare that
// it may sometimes produce bad results.
chrome.app.window.create(e.targetUrl, ...);
});
};
}
);
});
鉴于您所描述的条件,我认为这应该对您有用。
在更糟糕的情况下,某些网站可能会打开新的窗口/选项卡,如下所示:
function open(href) {
var w = window.open('', '_blank');
w.opener = null;
w.document.write(
'<META HTTP-EQUIV="refresh" content="0; url=' + href + '">');
w.document.close();
}
如果这样的网站被包裹在 webview 中,一切都会变得更加困难:上面“newwindow”处理程序中的 e.targetUrl 将包含“about:blank”,因此无需修改,代码将打开一个空白窗口/选项卡。要拦截来自访客的后续重定向,应用程序还必须使用chrome.webRequest API(该文档似乎仅适用于扩展,但该 API 也已可用于稳定渠道中的打包应用程序):
chrome.app.runtime.onLaunched.addListener(function() {
chrome.app.window.create(
'main.html',
{ 'width': 2000, 'height': 1000 },
function(win) {
win.contentWindow.onload = function() {
var webview = win.contentWindow.document.querySelector('#webview');
webview.addEventListener('newwindow', function(e) {
e.preventDefault();
if (e.targetUrl !== 'about:blank') {
// Easy case where the original link or window.open()
// already contains a target URL.
newWindow_openInTab(e.targetUrl);
} else {
// Harder case where the guest first opens a blank
// window and then redirects it via a
// 'META HTTP-EQUIV="refresh"'.
newWindow_openInTabAndInterceptRedirect(e.window);
});
};
}
);
});
function newWindow_openInTab(url) {
chrome.app.window.create(url, ...);
}
function newWindow_openInTabAndInterceptRedirect(newWindow) {
// Create an invisible proxy webview to listen to redirect
// requests from |newWindow| (the window that the guest is
// trying to open). NOTE: The proxy webview currently has to
// live somewhere in the DOM, so we append it to the body.
// This requirement is in the process of being eliminated.
var proxyWebview = document.createElement('webview');
document.body.appendChild(proxyWebview);
// Listen to onBeforeRequest event (chrome.webRequest API)
// on proxyWebview in order to intercept newWindow's redirects.
var onBeforeRequestListener = function(e) {
// Only consider top-level non-blank redirects.
if (e.type === "main_frame" && e.url !== 'about:blank') {
chrome.app.window.create(e.url, ...);
// Don't need proxyWebview anymore.
document.body.removeChild(proxyWebview);
// Handled this redirect: cancel further processing.
return { cancel: true };
} else {
// Ignored this redirect: proceed with default processing.
return { cancel: false };
}
};
proxyWebview.onBeforeRequest.addListener(
onBeforeRequestListener,
{ urls: [ "*://*/*" ] },
[ 'blocking' ]
);
// Attach |newWindow| to proxyWebview. From the original
// webview guest's point of view, the window is now opened
// and ready to be redirected: when it does so, the redirect
// will be intercepted by |onBeforeRequestListener|.
newWindow.attach(proxyWebview);
}