Wicket download link - wicket

Question

On the Wicket page I have an image (AbstractDefaultAjaxBehavior.INDICATOR) which is shown on submit and then i start a AjaxSelfUpdatingTimerBehavior to monitor a file.
Now I also have a DownloadLink to download the same file. However after download the image which I mentioned above (which is rotating) stops rotating. Is there a solution to this issue? I am new to wicket. Please suggest.
public LoggingPage() {
Form<Void> form;
this.add(form = new Form<Void>("resourceForm") {
private static final long serialVersionUID = 1L;
#Override
protected void onSubmit() {
submit();
}
});
add(new DownloadLink("downloadButton", new AbstractReadOnlyModel<File>()
{
private static final long serialVersionUID = 1L;
#Override
public File getObject()
{
File file;
try
{
file = new File(LoggingPage.this.fileDetail.getLocation());
}
catch (Exception e)
{
throw new RuntimeException(e);
}
return file;
}
}));
}//cons ends
private void submit() {
if (this.serverDetail != null && this.fileType != null && this.fileDetail != null)
{
if (this.fileViewer != null)
{
this.repeater.removeAll();
}
File file = new File(this.fileDetail.getLocation());
file = new File("C:/ueshome/logs/safe.log");
this.fileViewer = new FileViewer(file);
this.fileViewer.startTailing();
log.debug("load of allLog: " + this.fileViewer.getOldLog());
buildItem(this.fileViewer.getOldLog().getLog().toString());
this.container.add(new AjaxSelfUpdatingTimerBehavior(Duration.seconds(1))
{
#Override
protected void onPostProcessTarget(final AjaxRequestTarget target)
{
target.appendJavascript("$('#container').scrollTop( 999999999 )");
log.debug("onPostProcessTarget: " + LoggingPage.this.fileViewer.hashCode() + "at: " + System.currentTimeMillis());
final FileAttributes fileAttributes = LoggingPage.this.fileViewer.getNewLog();
String newLog = fileAttributes.getLog().toString();
log.debug("nextlog inside load()");
if (newLog != null && newLog.trim().length() > 0)
{
log.debug("~~~~~~~~~~~~~~~~~~~~````*****:" + newLog);
log.debug("String.valueOf(fileAttributes.getSize()))~~~~~~~~~~~~~~~~~~~~````*****:" + String.valueOf(fileAttributes.getSize()));
log.debug("String.valueOf(fileAttributes.getLastModified()): " + String.valueOf(fileAttributes.getLastModified()));
if (LoggingPage.this.repeater.getSizeInBytes() >= logSize)
{
LoggingPage.this.repeater.removeAll();
}
Component item = buildItem(newLog);
target.prependJavascript(String.format(
"var item=document.createElement('%s');item.id='%s';Wicket.$('%s').appendChild(item);",
"div", item.getMarkupId(), LoggingPage.this.container.getMarkupId()));
// LoggingPage.this.imgContainer.setVisible(true);
// target.addComponent(LoggingPage.this.imgContainer);
target.addComponent(item);
target.appendJavascript("$('#fileAttributesContainer').show(); ");
target.appendJavascript("$('#container').scrollTop( 999999999 )");
target.appendJavascript("$('#imageContainer').show(); ");
}
else
{
target.appendJavascript("$('#fileAttributesContainer').show(); ");
target.appendJavascript("$('#container').scrollTop( 999999999 )");
target.appendJavascript("$('#imageContainer').show(); ");
}
target.appendJavascript("alert('You are in Ajax Self')");
}

Answer 1

First I have to admit that I have no idea right now what could be wrong with your code. It looks rather different than how I would solve your task.
As I understand you want to have a image (an animated gif) that is animated after the user hits the submit button, right. And it should stop the animation after a certain condition is met (file generation finished etc.). Also you want to have a download link for your file.
What I would do is
use a animated gif that will be shown
add a AjaxSelfUpdatingTimerBehavior that checks your file and if a certain condition is met it changes the image (maybe by changing the image itself, sets the visibility of the image or by changing some css attribute for the image container)
for the file download I would use an ajax button or if nothing should be changed on your side a normal link that delivers an resource stream for your file
Hope this helps a little bit.