Re: multiple AjaxFileDropBehaviour on single page
On Wed, Aug 14, 2019 at 10:19 AM Sven Meier wrote: > Hi Korbinian, > > Wicket Ajax is primarily used for UI updates, thus all requests *have* > to be sent sequentially: Otherwise user input > (click...tab...type...click...click) would not be processed in a > deterministic way! > Furthermore all requests are queued on the server too (each page is > locked separately), so developers don't need to tackle multi-threading > in their UI code. > > I'm not aware of any UI toolkit that is multi-threaded. Because of our > use of Ajax, users can still continue to use the UI while a request is > running - that's better than other solutions (e.g. Swing or Android) > where everything is halted (layout, repaint) until the processing has > finished. > > Regarding parallel file uploads: > This is clearly something that could be done asynchronously since it > doesn't interfere with user input. > For the JS side you just have to use a separate Ajax channel. But the > request has to be targeted at a resource instead of a component, since > the former is processed in parallel. > > Take a look at AjaxDownloadBehavior, it is able to target a resource > (locks the page) or a resourceReference (doesn't lock the page). > Maybe we can improve AjaxFileDropBehaviour to do something similar. > +1 After reading the last paragraph I think AjaxUploadBehavior would have been a better name for this class, since it is the opposite of AjaxDownloadBehavior. But naming has always have been hard! :-) > > Have fun > Sven > > > On 13.08.19 21:17, Korbinian Bachl wrote: > > Hi Sven, > > > > so to get this right: all wicket ajax is basically a queue where only 1 > instance is worked on at a time and nothing is possible in parallel? > > (but browsers and ajax in parallel is working since at least 2011? e.g.: > jQuery.when() ) > > > > You mention the upload to a resource - how would this change it in that > in could be parallel and could you point me an example? > > > > Best & Thanks for the answer so far, > > > > KB > > > > - Ursprüngliche Mail - > >> Von: "Sven Meier" > >> An: "users" > >> Gesendet: Dienstag, 13. August 2019 09:03:49 > >> Betreff: Re: multiple AjaxFileDropBehaviour on single page > >> Hi, > >> > >> all Ajax behaviors' requests are queued in the browser. Even if you > >> disable this (see AjaxRequestAttributes#channel), all access to the page > >> is synchronized on the server anyway. > >> > >> You could to upload to a resource instead, AjaxFileDropBehaviour doesn't > >> support this though. > >> > >> Have fun > >> Sven > >> > >> > >> On 13.08.19 08:19, Korbinian Bachl wrote: > >>> Hi, > >>> > >>> wicket 8 has this neat AjaxFileDropBehaviour and it works like charm. > However, > >>> if I have multiple components on one page with a AjaxFileDropBehaviour > each and > >>> the upload of 1 drop is running, i cant upload a 2nd one at the same > time; Any > >>> idea how to solve this? > >>> > >>> E.g.: File 1 with 100MB gets dropped onto component A, File B wiht > 50MB gets > >>> dropped onto Component B about 10 secs later - upload of a is not > working and > >>> page somehow goes stale. It might be noteworthy that during the upload > an > >>> IAjaxIndicatorAware spinner is shown on Component A (and expected on > B); > >>> > >>> Best, > >>> > >>> KB > >>> > >>> - > >>> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > >>> For additional commands, e-mail: users-h...@wicket.apache.org > >>> > >> - > >> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > >> For additional commands, e-mail: users-h...@wicket.apache.org > > - > > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > > For additional commands, e-mail: users-h...@wicket.apache.org > > > > - > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > >
Re: multiple AjaxFileDropBehaviour on single page
Hi Korbinian, Wicket Ajax is primarily used for UI updates, thus all requests *have* to be sent sequentially: Otherwise user input (click...tab...type...click...click) would not be processed in a deterministic way! Furthermore all requests are queued on the server too (each page is locked separately), so developers don't need to tackle multi-threading in their UI code. I'm not aware of any UI toolkit that is multi-threaded. Because of our use of Ajax, users can still continue to use the UI while a request is running - that's better than other solutions (e.g. Swing or Android) where everything is halted (layout, repaint) until the processing has finished. Regarding parallel file uploads: This is clearly something that could be done asynchronously since it doesn't interfere with user input. For the JS side you just have to use a separate Ajax channel. But the request has to be targeted at a resource instead of a component, since the former is processed in parallel. Take a look at AjaxDownloadBehavior, it is able to target a resource (locks the page) or a resourceReference (doesn't lock the page). Maybe we can improve AjaxFileDropBehaviour to do something similar. Have fun Sven On 13.08.19 21:17, Korbinian Bachl wrote: Hi Sven, so to get this right: all wicket ajax is basically a queue where only 1 instance is worked on at a time and nothing is possible in parallel? (but browsers and ajax in parallel is working since at least 2011? e.g.: jQuery.when() ) You mention the upload to a resource - how would this change it in that in could be parallel and could you point me an example? Best & Thanks for the answer so far, KB - Ursprüngliche Mail - Von: "Sven Meier" An: "users" Gesendet: Dienstag, 13. August 2019 09:03:49 Betreff: Re: multiple AjaxFileDropBehaviour on single page Hi, all Ajax behaviors' requests are queued in the browser. Even if you disable this (see AjaxRequestAttributes#channel), all access to the page is synchronized on the server anyway. You could to upload to a resource instead, AjaxFileDropBehaviour doesn't support this though. Have fun Sven On 13.08.19 08:19, Korbinian Bachl wrote: Hi, wicket 8 has this neat AjaxFileDropBehaviour and it works like charm. However, if I have multiple components on one page with a AjaxFileDropBehaviour each and the upload of 1 drop is running, i cant upload a 2nd one at the same time; Any idea how to solve this? E.g.: File 1 with 100MB gets dropped onto component A, File B wiht 50MB gets dropped onto Component B about 10 secs later - upload of a is not working and page somehow goes stale. It might be noteworthy that during the upload an IAjaxIndicatorAware spinner is shown on Component A (and expected on B); Best, KB - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: multiple AjaxFileDropBehaviour on single page
I would simply lock other drag and drop upload components, while upload is in progress. You can also have a look at my experiments with custom drag and drop upload fields here https://github.com/andruhon/WicketDragAndDropFileAjaxUpload I have similar implementation in my app and it does allow you to drop files into multiple drag and drop area, however, files are uploaded sequentially, one by one. On 2019/08/13 06:19:08, Korbinian Bachl wrote: > Hi, > > wicket 8 has this neat AjaxFileDropBehaviour and it works like charm. > However, if I have multiple components on one page with a > AjaxFileDropBehaviour each and the upload of 1 drop is running, i cant upload > a 2nd one at the same time; Any idea how to solve this? > > E.g.: File 1 with 100MB gets dropped onto component A, File B wiht 50MB gets > dropped onto Component B about 10 secs later - upload of a is not working and > page somehow goes stale. It might be noteworthy that during the upload an > IAjaxIndicatorAware spinner is shown on Component A (and expected on B); > > Best, > > KB > > - > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > > - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: multiple AjaxFileDropBehaviour on single page
Hi Sven, so to get this right: all wicket ajax is basically a queue where only 1 instance is worked on at a time and nothing is possible in parallel? (but browsers and ajax in parallel is working since at least 2011? e.g.: jQuery.when() ) You mention the upload to a resource - how would this change it in that in could be parallel and could you point me an example? Best & Thanks for the answer so far, KB - Ursprüngliche Mail - > Von: "Sven Meier" > An: "users" > Gesendet: Dienstag, 13. August 2019 09:03:49 > Betreff: Re: multiple AjaxFileDropBehaviour on single page > Hi, > > all Ajax behaviors' requests are queued in the browser. Even if you > disable this (see AjaxRequestAttributes#channel), all access to the page > is synchronized on the server anyway. > > You could to upload to a resource instead, AjaxFileDropBehaviour doesn't > support this though. > > Have fun > Sven > > > On 13.08.19 08:19, Korbinian Bachl wrote: >> Hi, >> >> wicket 8 has this neat AjaxFileDropBehaviour and it works like charm. >> However, >> if I have multiple components on one page with a AjaxFileDropBehaviour each >> and >> the upload of 1 drop is running, i cant upload a 2nd one at the same time; >> Any >> idea how to solve this? >> >> E.g.: File 1 with 100MB gets dropped onto component A, File B wiht 50MB gets >> dropped onto Component B about 10 secs later - upload of a is not working and >> page somehow goes stale. It might be noteworthy that during the upload an >> IAjaxIndicatorAware spinner is shown on Component A (and expected on B); >> >> Best, >> >> KB >> >> - >> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org >> For additional commands, e-mail: users-h...@wicket.apache.org >> > > - > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: multiple AjaxFileDropBehaviour on single page
Hi, all Ajax behaviors' requests are queued in the browser. Even if you disable this (see AjaxRequestAttributes#channel), all access to the page is synchronized on the server anyway. You could to upload to a resource instead, AjaxFileDropBehaviour doesn't support this though. Have fun Sven On 13.08.19 08:19, Korbinian Bachl wrote: Hi, wicket 8 has this neat AjaxFileDropBehaviour and it works like charm. However, if I have multiple components on one page with a AjaxFileDropBehaviour each and the upload of 1 drop is running, i cant upload a 2nd one at the same time; Any idea how to solve this? E.g.: File 1 with 100MB gets dropped onto component A, File B wiht 50MB gets dropped onto Component B about 10 secs later - upload of a is not working and page somehow goes stale. It might be noteworthy that during the upload an IAjaxIndicatorAware spinner is shown on Component A (and expected on B); Best, KB - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
