com.vaadin.client

Class ResourceLoader

java.lang.Object

com.vaadin.client.ResourceLoader

public class ResourceLoader
extends Object

ResourceLoader lets you dynamically include external scripts and styles on the page and lets you know when the resource has been loaded.

Since:

7.0.0

Author:

Vaadin Ltd

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ResourceLoader.ResourceLoadEvent Event fired when a resource has been loaded.
static interface	ResourceLoader.ResourceLoadListener Event listener that gets notified when a resource has been loaded.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ResourceLoader() Creates a new resource loader.

Method Summary

Modifier and Type	Method and Description
static void	addOnloadHandler(com.google.gwt.dom.client.Element element, ResourceLoader.ResourceLoadListener listener, ResourceLoader.ResourceLoadEvent event) Adds an onload listener to the given element, which should be a link or a script tag.
static ResourceLoader	get() Returns the default ResourceLoader.
void	loadHtmlImport(String htmlUrl, ResourceLoader.ResourceLoadListener resourceLoadListener) Loads an HTML import and notify a listener when the HTML import is loaded.
void	loadScript(String scriptUrl, ResourceLoader.ResourceLoadListener resourceLoadListener) Load a script and notify a listener when the script is loaded.
void	loadStylesheet(String stylesheetUrl, ResourceLoader.ResourceLoadListener resourceLoadListener) Load a stylesheet and notify a listener when the stylesheet is loaded.
protected void	runWhenHtmlImportsReady(Runnable runnable) Executes a Runnable when all HTML imports are ready.

Methods inherited from class java.lang.Object

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

Constructor Detail

ResourceLoader

protected ResourceLoader()

Creates a new resource loader. You should generally not create you own resource loader, but instead use get() to get an instance.

Method Detail

get

public static ResourceLoader get()

Returns the default ResourceLoader.

Returns:

the default ResourceLoader

loadScript

public void loadScript(String scriptUrl,
                       ResourceLoader.ResourceLoadListener resourceLoadListener)

Load a script and notify a listener when the script is loaded. Calling this method when the script is currently loading or already loaded doesn't cause the script to be loaded again, but the listener will still be notified when appropriate.

Parameters:

scriptUrl - the url of the script to load

resourceLoadListener - the listener that will get notified when the script is loaded

loadHtmlImport

public void loadHtmlImport(String htmlUrl,
                           ResourceLoader.ResourceLoadListener resourceLoadListener)

Loads an HTML import and notify a listener when the HTML import is loaded. Calling this method when the HTML import is currently loading or already loaded doesn't cause the HTML import to be loaded again, but the listener will still be notified when appropriate.

Parameters:

htmlUrl - url of HTML import to load

resourceLoadListener - listener to notify when the HTML import is loaded

addOnloadHandler

public static void addOnloadHandler(com.google.gwt.dom.client.Element element,
                                    ResourceLoader.ResourceLoadListener listener,
                                    ResourceLoader.ResourceLoadEvent event)

Adds an onload listener to the given element, which should be a link or a script tag. The listener is called whenever loading is complete or an error occurred.

Parameters:

element - the element to attach a listener to

listener - the listener to call

event - the event passed to the listener

Since:

7.3

loadStylesheet

public void loadStylesheet(String stylesheetUrl,
                           ResourceLoader.ResourceLoadListener resourceLoadListener)

Load a stylesheet and notify a listener when the stylesheet is loaded. Calling this method when the stylesheet is currently loading or already loaded doesn't cause the stylesheet to be loaded again, but the listener will still be notified when appropriate.

Parameters:

stylesheetUrl - the url of the stylesheet to load

resourceLoadListener - the listener that will get notified when the stylesheet is loaded

runWhenHtmlImportsReady

protected void runWhenHtmlImportsReady(Runnable runnable)

Executes a Runnable when all HTML imports are ready. If the browser does not support triggering an event when HTML imports are ready, the Runnable is executed immediately.

Parameters:

runnable - the code to execute

Since:

8.1