# Double layer of AJAX? **URL:** \ **Category:** Rails\ **Created:** [December 6, 2006, 7:37pm UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537 "2006-12-06T19:37:37Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [December 6, 2006, 7:37pm UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537/1 "2006-12-06T19:37:37Z")
Is it possible or easy to have a double layer of ajax ? 1. Basicaly there is a page that is rendered where you can delete objects by marking them with a check box. When you click delete all marked, it deletes those objects and updates the page with ajax. 2 part 1 above is followed by another section where if you click on “update” it displays a upload form through ajax for acts\_as\_attachment where the user can browse for a file to upload. 1 & 2 are both ajax, but after 2 runs it has to redisplay the page. If there was another ajax layer that rendered both 1 & 2, and 1 & 2 where also ajax, then the ajax would have 2 layers. Is that possible or easy to do ? ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [December 6, 2006, 10:34pm UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537/2 "2006-12-06T22:34:32Z")
On 12/7/06, removed\_email\_address@domain.invalid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > where the user can browse for a file to upload. > > 1 & 2 are both ajax, but after 2 runs it has to redisplay the page. If > there was another ajax layer that rendered both 1 & 2, and 1 & 2 where > also ajax, then the ajax would have 2 layers. Is that possible or easy > to do ? If I understand you correctly, you want to reload the page after completing the file upload, right? That’s what RJS is for. RJS is a way of sending javascript commands back to the browser as the response of an Ajax request, which then gets executed by the browser instead of displayed as html. You can create a template with extension .rjs, for example ‘upload.rjs’ which is rendered after the uplaod action is complete and redirect back to the original page. This file should look something like this: page.redirect :controller=\>‘some\_controller’, :action=\>‘show’, :id=\>@some\_model Cheers, max ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [December 7, 2006, 3:49pm UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537/3 "2006-12-07T15:49:02Z")
I have some ajax working, and it renders part of the page. What I really am asking is: say you have a page A that partially renders B so that A does not refresh when the action for B is invoked. However now you have C. C is either part of B or B and C are part of something else. When the action for C is invoked which is a acts\_as\_attachment new. It renders C without refreshing B. This rendering of C shows an upload form. After the upload occurs another refresh would happen which would refresh B and C but not A. It’s a little complex and that’s the best I can explain it. I’m a little confused about it myself … ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [December 7, 2006, 4:31pm UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537/4 "2006-12-07T16:31:16Z")
wbsurfver wrote: > explain it. I’m a little confused about it myself … > State it again in terms of what a user would perceive. (That technique is the power behind Use Cases…) – Phlip [http://c2.com/cgi/wiki?ZeekLand](http://c2.com/cgi/wiki?ZeekLand) ← NOT a blog!! ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [December 7, 2006, 9:46pm UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537/5 "2006-12-07T21:46:58Z")
Ok, there is a main page, call it A. On this page there is a set of pictures (call this B) you can mark each picture for delete with check boxes and click a delete which will delete them and update the page so that only B is refreshed by removing the deleted pictures and re rendering B without rendering A. Then there is another section (call that C). Here there is a link that says “upload picture”. This is done because acts\_as\_attachement seems to work in that first there is a call to new() to create an item in the controller. so you click “upload picture” which calls new(), new() renders a new ajax through C without refreshing A or B. Now instead of seeing “upload picture” as a link, you see a browser form where you can select an image from the disk. This was rendered without refreshing A or B and is how acts\_as\_attachment works from examples I have followed. Next when you send the image back to the controller that you selected in the browser it’s through a create() call as acts\_as\_attachment works. After the create call, my code refreshes the whole page A,B, and C. I want it to just refresh B and C. ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [December 8, 2006, 3:57am UTC](https://www.ruby-forum.com/t/double-layer-of-ajax/78537/6 "2006-12-08T03:57:41Z")
On Dec 7, 2006, at 12:45 PM, removed\_email\_address@domain.invalid wrote: > to new() to create an item in the controller. so you click “upload > picture” which calls new(), new() renders a new ajax through C without > refreshing A or B. Now instead of seeing “upload picture” as a link, > you see a browser form where you can select an image from the disk. > This was rendered without refreshing A or B and is how > acts\_as\_attachment works from examples I have followed. Next when you > send the image back to the controller that you selected in the browser > it’s through a create() call as acts\_as\_attachment works. After the > create call, my code refreshes the whole page A,B, and C. I want it to > just refresh B and C. ``` You cannot do file uploads via ajax. That being said , you can do ``` what looks like ajax file uploads by targeting the upload form to submit to a hidden iframe on the page. But then responding back from the upload controller without refreshing the entire page is hard because whatever you return from the upload action goes to the iframe where the upload was sent thru. So you need a plugin called respond\_to\_parent that will let you send an rjs response back to the iframe that will get eval’d in the parent window so you can refresh just a small part of the page. ``` Phew! confused yet? ``` [http://sean.treadway.info/svn/plugins/responds\_to\_parent/README](http://sean.treadway.info/svn/plugins/responds_to_parent/README) Cheers- – Ezra Z. – Lead Rails Evangelist – removed\_email\_address@domain.invalid – Engine Y., Serious Rails Hosting – (866) 518-YARD (9273)