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---
title: Accessing Web Page And Browser Information
order: 27
layout: page
---
[[accessing-web-page-and-browser-information]]
= Accessing web page and browser information
Vaadin 7 includes a new *Page* class offering access to various
client-side information and events concerning the web page and browser
window in which the Vaadin UI resides. The Page instance corresponding
to a given UI is accessed via the `getPage()` method of the UI or using
a static method `Page.getCurrent()`.
You can access the browser window size and add size change listeners:
[source,java]
....
Page page = someUI.getPage();
page.addBrowserWindowResizeListener(new BrowserWindowResizeListener() {
public void browserWindowResized(BrowserWindowResizeEvent event) {
Notification.show("Window width=" + event.getWidth() + ", height=" + event.getHeight());
}
});
....
You can access the optional fragment part of the location URI and add
fragment change listeners:
[source,java]
....
page.setUriFragment(page.getUriFragment() + "foo");
page.addUriFragmentChangedListener(new UriFragmentChangedListener() {
public void uriFragmentChanged(UriFragmentChangedEvent event) {
Notification.show("Fragment=" + event.getUriFragment());
}
});
....
You can access client browser details:
[source,java]
....
Notification.show("IP" + browser.getAddress() +
"User-Agent:" + browser.getBrowserApplication() +
"Linux: " + browser.isLinux());
....
https://demo.vaadin.com/sampler/#foundation/advanced/browser-information[Live
Demo]
Note: If you are using a reverse proxy, you must get the value
`X-Forwarded-For` from request headers. You cannot get a browser name,
but you can check which browser are using.
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