问题
While running a Flash app, if I open a new or existing Facebook chat window, my Flash content disappears. I can continue to hear music playing from the app and when I close/minimize the Facebook chat window, my Flash content reappears. Is this a known issue?
This is happening in Google Chrome 15 and Internet Explorer 9 on Windows 7 with Flash Player 11.
I checked this on my own Flash app as well as on another Flash app made by someone else and the same behaviour is occurring. It does not however hide non-Flash content.
It seems to be a bug with Facebook chat and Flash content.
回答1:
from http://developers.facebook.com/docs/appsonfacebook/tutorial/:
If you are hosting an Adobe Flash application within Canvas, it is recommended that you set the wmode of the Flash object to "opaque":
... Other modes (including the default mode, wmode="window", wmode="direct", and wmode="gpu") require us to hide your flash object when dialogs, popups, chat tabs, and ticker flyouts occur. This can be unpleasant or confusing for users.
回答2:
From the documentation:
If you must use wmode values of window or direct, Canvas will automatically hide and display the Flash object when Dialogs, Ticket flyouts, Chat Tabs and Notifications display.
Developers who wish to provide a custom hide and display experience may pass a JavaScript function in the hideFlashCallback option for FB.init. This function will be executed whenever the Flash object is hidden or displayed due to user behavior (clicking on a Notification, etc.) and can be used by a developer to take the appropriate actions: hiding or displaying their Flash object.
FB.init({
...,
hideFlashCallback: function(params) {
if (params.state == 'opened') {
$('#some-image').show();
FB.Canvas.hideFlashElement(params.elem);
} else {
$('#some-image').hide();
FB.Canvas.showFlashElement(params.elem);
}
});
来源：https://stackoverflow.com/questions/8202256/facebook-chat-hides-flash-apps-when-open