com.vaadin.flow.component.page

Class Page

java.lang.Object

com.vaadin.flow.component.page.Page

All Implemented Interfaces:

Serializable

public class Page
extends Object
implements Serializable

Represents the web page open in the browser, containing the UI it is connected to.

Since:

1.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Page.ExecutionCanceler Callback method for canceling executable javascript set with executeJavaScript(String, Serializable...).

Constructor Summary

Constructors

Constructor and Description
Page(UI ui) Creates a page instance for the given UI.

Method Summary

Modifier and Type	Method and Description
Registration	addBrowserWindowResizeListener(BrowserWindowResizeListener resizeListener) Adds a new BrowserWindowResizeListener to this UI.
void	addHtmlImport(String url) Adds the given HTML import to the page and ensures that it is loaded successfully.
void	addHtmlImport(String url, LoadMode loadMode) Adds the given HTML import to the page and ensures that it is loaded successfully.
void	addJavaScript(String url) Adds the given JavaScript to the page and ensures that it is loaded successfully.
void	addJavaScript(String url, LoadMode loadMode) Adds the given JavaScript to the page and ensures that it is loaded successfully.
void	addStyleSheet(String url) Adds the given style sheet to the page and ensures that it is loaded successfully.
void	addStyleSheet(String url, LoadMode loadMode) Adds the given style sheet to the page and ensures that it is loaded successfully.
Page.ExecutionCanceler	executeJavaScript(String expression, Serializable... parameters) Asynchronously runs the given JavaScript expression in the browser.
History	getHistory() Gets a representation of window.history for this page.
void	reload() Reloads the page in the browser.
void	setTitle(String title) Sets the page title.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Page

public Page(UI ui)

Creates a page instance for the given UI.

Parameters:

ui - the UI that this page instance is connected to

Method Detail

setTitle

public void setTitle(String title)

Sets the page title. The title is displayed by the browser e.g. as the title of the browser window or tab.

To clear the page title, use an empty string.

Parameters:

title - the page title to set, not null

addStyleSheet

public void addStyleSheet(String url)

Adds the given style sheet to the page and ensures that it is loaded successfully.

Relative URLs are interpreted as relative to the configured frontend directory location. You can prefix the URL with context:// to make it relative to the context path or use an absolute URL to refer to files outside the frontend directory.

For component related style sheet dependencies, you should use the @StyleSheet annotation.

Is is guaranteed that style sheet will be loaded before the first page load. For more options, refer to addStyleSheet(String, LoadMode)

Parameters:

url - the URL to load the style sheet from, not null

addStyleSheet

public void addStyleSheet(String url,
                          LoadMode loadMode)

Adds the given style sheet to the page and ensures that it is loaded successfully.

Relative URLs are interpreted as relative to the configured frontend directory location. You can prefix the URL with context:// to make it relative to the context path or use an absolute URL to refer to files outside the frontend directory.

For component related style sheet dependencies, you should use the @StyleSheet annotation.

Parameters:

url - the URL to load the style sheet from, not null

loadMode - determines dependency load mode, refer to LoadMode for details

addJavaScript

public void addJavaScript(String url)

Adds the given JavaScript to the page and ensures that it is loaded successfully.

Relative URLs are interpreted as relative to the configured frontend directory location. You can prefix the URL with context:// to make it relative to the context path or use an absolute URL to refer to files outside the frontend directory.

For component related JavaScript dependencies, you should use the @JavaScript annotation.

Is is guaranteed that script will be loaded before the first page load. For more options, refer to addJavaScript(String, LoadMode)

Parameters:

url - the URL to load the JavaScript from, not null

addJavaScript

public void addJavaScript(String url,
                          LoadMode loadMode)

Adds the given JavaScript to the page and ensures that it is loaded successfully.

Relative URLs are interpreted as relative to the configured frontend directory location. You can prefix the URL with context:// to make it relative to the context path or use an absolute URL to refer to files outside the frontend directory.

For component related JavaScript dependencies, you should use the @JavaScript annotation.

Parameters:

url - the URL to load the JavaScript from, not null

loadMode - determines dependency load mode, refer to LoadMode for details

addHtmlImport

public void addHtmlImport(String url)

Adds the given HTML import to the page and ensures that it is loaded successfully.

Relative URLs are interpreted as relative to the configured frontend directory location. You can prefix the URL with context:// to make it relative to the context path or use an absolute URL to refer to files outside the frontend directory.

Is is guaranteed that html import will be loaded before the first page load. For more options, refer to addHtmlImport(String, LoadMode)

Parameters:

url - the URL to load the HTML import from, not null

addHtmlImport

public void addHtmlImport(String url,
                          LoadMode loadMode)

Adds the given HTML import to the page and ensures that it is loaded successfully.

Relative URLs are interpreted as relative to the configured frontend directory location. You can prefix the URL with context:// to make it relative to the context path or use an absolute URL to refer to files outside the frontend directory.

Parameters:

url - the URL to load the HTML import from, not null

loadMode - determines dependency load mode, refer to LoadMode for details

executeJavaScript

public Page.ExecutionCanceler executeJavaScript(String expression,
                                                Serializable... parameters)

Asynchronously runs the given JavaScript expression in the browser. The given parameters will be available to the expression as variables named $0, $1, and so on. Supported parameter types are:

• String
• Integer
• Double
• Boolean
• JsonValue
• Element (will be sent as null if the server-side element instance is not attached when the invocation is sent to the client)

Note that the parameter variables can only be used in contexts where a JavaScript variable can be used. You should for instance do 'prefix' + $0 instead of 'prefix$0' and value[$0] instead of value.$0 since JavaScript variables aren't evaluated inside strings or property names.

Parameters:

expression - the JavaScript expression to invoke

parameters - parameters to pass to the expression

Returns:

a callback for canceling the execution if not yet sent to browser

getHistory

public History getHistory()

Gets a representation of window.history for this page.

Returns:

the history representation

reload

public void reload()

Reloads the page in the browser.

addBrowserWindowResizeListener

public Registration addBrowserWindowResizeListener(BrowserWindowResizeListener resizeListener)

Adds a new BrowserWindowResizeListener to this UI. The listener will be notified whenever the browser window within which this UI resides is resized.

Parameters:

resizeListener - the listener to add, not null

Returns:

a registration object for removing the listener

See Also:

BrowserWindowResizeListener.browserWindowResized(BrowserWindowResizeEvent), Registration