/*
* Copyright 2009 Sven Meier
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package wicketdnd;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.protocol.http.request.WebClientInfo;
import org.apache.wicket.request.cycle.RequestCycle;
/**
* Fix for caching of background images in IE.
* <br>
* IE 6 fails to cache images if they are used as CSS backgrounds. This
* javascript enables caching by executing an IE proprietary command.
*
* @author Sven Meier
*/
public class IEBackgroundImageCacheFix extends Behavior
{
private static final long serialVersionUID = 1L;
public final void renderHead(IHeaderResponse response)
{
WebClientInfo info = new WebClientInfo(RequestCycle.get());
if (info.getProperties().isBrowserInternetExplorer())
{
String initJS = "try { document.execCommand('BackgroundImageCache', false, true); } catch (e) {};";
response.renderOnDomReadyJavaScript(initJS);
}
}
}