How to find out about the User Agent in GWT

问题

I am trying to write browser specific code. Is there a GWT API to find out which browser the client is using?

回答1:

The GWT Developer's Guide page on Cross-Browser Support gives a JSNI function that returns the UserAgent string.

Note, however, that you probably want to use Deferred Binding to write browser-specific code, instead of detecting the UserAgent.

Edit: Kasturi points out Window.Navigator.getUserAgent(), which is implemented like so:

/**
 * Gets the navigator.appName.
 *
 * @return the window's navigator.appName.
 */
public static native String getAppName() /*-{
  return $wnd.navigator.appName;
}-*/;

So yes, this should do what the function mentioned on the Cross-Browser Support page does (except that it doesn't call toLowerCase() on it), though again you may be better off using deferred binding.

来源：https://stackoverflow.com/questions/2759321/how-to-find-out-about-the-user-agent-in-gwt