Maybe, just maybe, we could look at the accept header, before rendering the page...
-Matej On Dec 21, 2007 6:42 AM, Igor Vaynberg <[EMAIL PROTECTED]> wrote: > that is actually in our gotchas wiki page - images with src="" cause a > request to the page... > > -igor > > > > On Dec 20, 2007 6:54 PM, Tauren Mills <[EMAIL PROTECTED]> wrote: > > I think this problem is caused by the browser. Using Firebug, it > > looks like the browser is actually requesting the page a second time. > > Both requests go to: > > http://localhost:8080/db/app/?wicket:interface=:15:::: > > > > Here are the request headers from the first request: > > > > Host: localhost:8080 > > User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; > > rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 > > Accept: > > text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 > > Accept-Language: en-us,en;q=0.5 > > Accept-Encoding: gzip,deflate > > Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > > Keep-Alive: 300 > > Connection: keep-alive > > Referer: http://localhost:8080/db/app/?wicket:interface=:2:::: > > Cookie: JSESSIONID=1hndka1no7ub6; styleswitcher_style=small > > > > The browser then makes a second request: > > > > Host: localhost:8080 > > User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; > > rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 > > Accept: image/png,*/*;q=0.5 > > Accept-Language: en-us,en;q=0.5 > > Accept-Encoding: gzip,deflate > > Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > > Keep-Alive: 300 > > Connection: keep-alive > > Referer: http://localhost:8080/db/app/?wicket:interface=:3:::: > > Cookie: JSESSIONID=1hndka1no7ub6; styleswitcher_style=small > > Cache-Control: max-age=0 > > > > Note that the second request has a different Accept (images only?) and > > a Cache-Control. > > > > This seems to only be happening to me when the image source is empty. > > Even having any text in there works. The following wicket output > > causes the problem: > > <img wicket:id="image1" src=""/> > > > > So it looks like if there is an image on the page without a source > > (not just a broken image), that Firefox requests the page URL again. > > And by doing so, causes my DataView to refresh. But it doesn't > > refresh the DOM on the 2nd request, only images. Thus the links are > > no longer valid. > > > > To solve this problem, I just need to make sure that my image src is > > never an empty string. Here is a simple hack that I did to my > > StaticImage class: > > > > public class StaticImage extends WebComponent { > > private static final long serialVersionUID = 1L; > > > > public StaticImage(String id, IModel model) { > > super(id, model); > > } > > > > protected void onComponentTag(ComponentTag tag) { > > checkComponentTag(tag, "img"); > > String src = getModelObjectAsString(); > > tag.put("src", (!src.equals("")?src:"no_image") ); > > } > > > > } > > > > With this, img src="no_image" in the markup. It doesn't render of > > course, but it also doesn't cause a 2nd page refresh. > > > > One last thing. If I just add <img src=""/> to my page's HTML, it > > appears that it is rewritten by wicket to be this: <img src="../"/>. > > So maybe this is a problem that was already discovered and solved. > > But when I made a custom component that alters the src, I lost that > > solution. > > > > I guess in the end, this isn't a wicket problem. It isn't really even > > a problem with my application, although I can solve it in my > > application. I don't know enough about why Firefox is doing this, so > > it might not even be a browser problem. Who knows... > > > > I hope this helps someone else who runs into a similar issue. > > > > Tauren > > > > > > > > > > > > > > > > > > On Dec 20, 2007 4:16 PM, Tauren Mills <[EMAIL PROTECTED]> wrote: > > > Gwyn, > > > > > > Thanks for the guidance! The DataProvider.iterator was being executed > > > twice. I put a breakpoint in iterator() and it would pause when the > > > page first started to load. Then I'd continue running the code, and > > > the breakpoint was hit again. At that time, the full page was > > > rendered except for some images on the page, and the browser was > > > paused loading again because of the breakpoint. When I continued > > > running the code, the page would finish loading. > > > > > > The images that weren't loaded are URLs stored in my DB. I found that > > > when I had image URLs in the DB, everything worked fine. But when I > > > had NULL entries for the images, then I'd get this exception and the > > > iterator would run twice. So when the iterator would run twice, the > > > component hierarchy would change, causing the link URLs to no longer > > > be valid. > > > > > > I'm still tracking it down to figure out exactly what is going on. > > > But you got me on the right track. And now I'm thinking it is more > > > of a problem in my application or database than in wicket itself. > > > Which is what I was hoping was the case anyway! :) > > > > > > Tauren > > > > > > > > > > > > On Dec 20, 2007 7:43 AM, Gwyn Evans <[EMAIL PROTECTED]> wrote: > > > > No real idea, but I'd be tempted to stick in some diagnostic logging > > > > to log the calls to the DataProvider & the details of the lists it > > > > returns, just to check there's nothing odd happening there... > > > > > > > > /Gwyn > > > > > > > > > > > > On 20/12/2007, Tauren Mills <[EMAIL PROTECTED]> wrote: > > > > > Thanks. I will try to put together a quickstart, but I'm not sure I > > > > > can duplicate the problem in it. > > > > > > > > > > Tauren > > > > > > > > > > > > > > > On Dec 19, 2007 3:23 PM, Matej Knopp <[EMAIL PROTECTED]> wrote: > > > > > > This is definitely strange. However without posting more code (or > > > > > > preferably a complete testcase to reproduce) I don't really know how > > > > > > to help you with it. > > > > > > > > > > > > -Matej > > > > > > > > > > > > > > > > > > On Dec 20, 2007 12:05 AM, Tauren Mills <[EMAIL PROTECTED]> wrote: > > > > > > > Does anyone have any thoughts on this problem? I realize this it > > > > > > > may > > > > > > > seem unique and isolated, but are there any suggestions even on > > > > > > > how to > > > > > > > figure out what is wrong? How can I figure out why the component > > > > > > > path > > > > > > > in the URLs for the Links in the DataView are not matching the > > > > > > > component hierarchy? These are the URLs output at initial page > > > > > > > creation time: > > > > > > > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:1:actions:select::ILinkListener:: > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:2:actions:select::ILinkListener:: > > > > > > > > > > > > > > However, at the time that onClick is processed, the component > > > > > > > hierarchy seems to have changed and now have the value of 3 and 4 > > > > > > > instead of 1 and 2. The links above don't work, but the following > > > > > > > links do if I manually enter them: > > > > > > > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:3:actions:select::ILinkListener:: > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:4:actions:select::ILinkListener:: > > > > > > > > > > > > > > Its almost as if a secondary page render has occurred. But I've > > > > > > > added > > > > > > > logging to my page and don't see any extra log output. > > > > > > > > > > > > > > My project is basically done and ready to launch, but this is > > > > > > > holding > > > > > > > it up. Any ideas or suggestions? > > > > > > > > > > > > > > Thanks! > > > > > > > Tauren > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Dec 18, 2007 11:21 PM, Tauren Mills <[EMAIL PROTECTED]> wrote: > > > > > > > > I'm having an Exception that is happening before any of my > > > > > > > > Link.onClick() code is executed, making me wonder if there is a > > > > > > > > wicket > > > > > > > > bug of some sort. > > > > > > > > > > > > > > > > I have a DataView with an ActionPanel in each row that contains > > > > > > > > a > > > > > > > > Link. There is no AJAX on this page. When I load the page with > > > > > > > > the > > > > > > > > DataView for the first time, clicking the Link doesn't work and > > > > > > > > I get > > > > > > > > an Exception (see below). But if I click the browser back > > > > > > > > button, > > > > > > > > then click the same link, it works. However, this problem only > > > > > > > > occurs > > > > > > > > for some of the data records, not all of them. But the same > > > > > > > > data > > > > > > > > records always break. I thought it was a data problem because > > > > > > > > of > > > > > > > > this, but tracing back into the wicket code seems to indicate > > > > > > > > otherwise. Also, I'm running on the latest wicket trunk that I > > > > > > > > updated to about 15 minutes ago. > > > > > > > > > > > > > > > > The URLs that are output for the Links in the dataview when the > > > > > > > > page > > > > > > > > is first loaded is (dataview has only 2 data records): > > > > > > > > > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:1:actions:select::ILinkListener:: > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:2:actions:select::ILinkListener:: > > > > > > > > > > > > > > > > When I hit the back button, the URLs for that same links are: > > > > > > > > > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:5:actions:select::ILinkListener:: > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:6:reports:reports:6:actions:select::ILinkListener:: > > > > > > > > > > > > > > > > The exception that is thrown is this (only when the first links > > > > > > > > are > > > > > > > > clicked, not the links after hitting the back button): > > > > > > > > > > > > > > > > WicketMessage: component reports:reports:1:actions:select not > > > > > > > > found on > > > > > > > > page > > > > > > > > com.theseniorlist.database.web.page.site.service.ServiceDetailsPage[id > > > > > > > > = 6], listener interface = [RequestListenerInterface > > > > > > > > name=ILinkListener, method=public abstract void > > > > > > > > org.apache.wicket.markup.html.link.ILinkListener.onLinkClicked()] > > > > > > > > > > > > > > > > Root cause: > > > > > > > > > > > > > > > > org.apache.wicket.WicketRuntimeException: component > > > > > > > > reports:reports:1:actions:select not found on page > > > > > > > > com.theseniorlist.database.web.page.site.service.ServiceDetailsPage[id > > > > > > > > = 6], listener interface = [RequestListenerInterface > > > > > > > > name=ILinkListener, method=public abstract void > > > > > > > > org.apache.wicket.markup.html.link.ILinkListener.onLinkClicked()] > > > > > > > > at > > > > > > > > org.apache.wicket.request.AbstractRequestCycleProcessor.resolveListenerInterfaceTarget(AbstractRequestCycleProcessor.java:411) > > > > > > > > at > > > > > > > > org.apache.wicket.request.AbstractRequestCycleProcessor.resolveRenderedPage(AbstractRequestCycleProcessor.java:456) > > > > > > > > at > > > > > > > > org.apache.wicket.protocol.http.WebRequestCycleProcessor.resolve(WebRequestCycleProcessor.java:139) > > > > > > > > at org.apache.wicket.RequestCycle.step(RequestCycle.java:1152) > > > > > > > > at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1245) > > > > > > > > at org.apache.wicket.RequestCycle.request(RequestCycle.java:489) > > > > > > > > at > > > > > > > > org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) > > > > > > > > at > > > > > > > > org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:121) > > > > > > > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) > > > > > > > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) > > > > > > > > at > > > > > > > > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:445) > > > > > > > > at > > > > > > > > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1050) > > > > > > > > at > > > > > > > > org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174) > > > > > > > > at > > > > > > > > org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77) > > > > > > > > at > > > > > > > > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1041) > > > > > > > > at > > > > > > > > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:354) > > > > > > > > at > > > > > > > > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:226) > > > > > > > > at > > > > > > > > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:627) > > > > > > > > at > > > > > > > > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:141) > > > > > > > > at org.mortbay.jetty.Server.handle(Server.java:269) > > > > > > > > at > > > > > > > > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:430) > > > > > > > > at > > > > > > > > org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:687) > > > > > > > > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:492) > > > > > > > > at > > > > > > > > org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:199) > > > > > > > > at > > > > > > > > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:339) > > > > > > > > at > > > > > > > > org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:208) > > > > > > > > at > > > > > > > > org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475) > > > > > > > > > > > > > > > > Sure enough, when I trace the wicket code and examine the data > > > > > > > > in > > > > > > > > memory, the first time the dataview page is loaded, the > > > > > > > > component path > > > > > > > > to the actual components are values 3 and 4. In fact, if after > > > > > > > > I load > > > > > > > > the page for the first time, I manually enter the following > > > > > > > > URLs, I > > > > > > > > get the correct page without an exception: > > > > > > > > > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:8:reports:reports:3:actions:select::ILinkListener:: > > > > > > > > http://localhost:8082/db/app/?wicket:interface=:8:reports:reports:4:actions:select::ILinkListener:: > > > > > > > > > > > > > > > > Why would the URLs that are rendered the first time be wrong? > > > > > > > > Is > > > > > > > > there something in my code that could cause this? > > > > > > > > > > > > > > > > Here is a trimmed down version of the code: > > > > > > > > > > > > > > > > public ReportListPanel(String id, final Service service) { > > > > > > > > super(id); > > > > > > > > > > > > > > > > this.service = service; > > > > > > > > > > > > > > > > ReportsDataProvider dataProvider = new > > > > > > > > ReportsDataProvider(dao); > > > > > > > > Report filter = (Report) dataProvider.getFilterState(); > > > > > > > > filter.setService(service); > > > > > > > > dataProvider.setFilterState(filter); > > > > > > > > > > > > > > > > final DataView reports = new > > > > > > > > DataView("reports", dataProvider) > > > > > > > > { > > > > > > > > @Override > > > > > > > > protected void populateItem(final Item > > > > > > > > item) > > > > > > > > { > > > > > > > > Report report = (Report) > > > > > > > > item.getModelObject(); > > > > > > > > item.setModel(new > > > > > > > > CompoundPropertyModel(report)); > > > > > > > > item.add(new > > > > > > > > ActionPanel(actions",item.getModel())); > > > > > > > > }; > > > > > > > > reports.setItemsPerPage(40); > > > > > > > > add(reports); > > > > > > > > } > > > > > > > > > > > > > > > > class ActionPanel extends Panel > > > > > > > > { > > > > > > > > public ActionPanel(String id, IModel model) > > > > > > > > { > > > > > > > > super(id, model); > > > > > > > > setModel(model); > > > > > > > > > > > > > > > > Link link = new Link("select",model) { > > > > > > > > @Override > > > > > > > > public void onClick() { > > > > > > > > setResponsePage(new > > > > > > > > ReportDetailsPage(getPage(),(Report)getModelObject(),service));; > > > > > > > > } > > > > > > > > }; > > > > > > > > link.add(new Label("summary")); > > > > > > > > add(link); > > > > > > > > } > > > > > > > > } > > > > > > > > > > > > > > > > Any help would be appreciated! > > > > > > > > > > > > > > > > Thanks, > > > > > > > > Tauren > > > > > > > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > > > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > > > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
