[Seaside] Dynamically serving contents for an iFrame

jtuchel at objektfabrik.de jtuchel at objektfabrik.de
Tue May 12 14:25:01 UTC 2015

Hi there,

I am having trouble changing the contents of an iFrame with contents are 
generated "dynamically".

What I want the page to do is change the contents of an iFrame when the 
user clicks a link. There is an unorderedList of links that each 
represent a document that can be displayed in the iFrame. The use of 
iFrames seems to be the only way to display PDF documents inline in the 

Here is how far I got after quite some fiddling and trial&error:

first, in my renderContentOn: I bind an onclick handler to each link 
that updates the src attribute of the iFrame:

     fileCallback :=

         html callbacks store: (WAActionCallback on: [self deliverFile]).

     html document addLoadScript: (

         '$(".documentLink").each(function(idx) {$(this).click(function(event){

                 $(".documentView iFrame").attr("src", "%1" + "&file=" + $(this).text());


             bindWith: (html actionUrl withField: fileCallback))

The callback method looks like this:


     |  dateiName fields req aWAFile response document |

     req := self requestContext request.

     fields := req fields.

     dateiName := (fields at: 'file').

     aWAFile := "stuff that fetches the WAFile from a DB"


     self requestContext respond: [:resp |


             document: aWAFile contents mimeType: aWAFile contentType fileName: aWAFile fileName]

This almost works.

When I click on the link, the src attribute of the iframe is being 
updated and the callback method is invoked. The file is served and is 
exactly the PDF document I expect.

BUT: instead of the iframe updating with the contents, the web browser 
asks me whether I want to save the file or open it with an some local 
application. That is of course not the expected behavior.

I see two areas which could be wrong:

a) The way the callback method changes the response to server the images 
/ pdfs
   I found some old messages on this list 
(http://forum.world.st/Usage-of-WAIframeTag-tp88208.html) that use 
returnResponse: , which is deprecated and even is not present in Pharo 3 
any more.

b) the way I try to update the iframe by changing its src attribute

     If I use set a static url in the .attr("src", someStaticUrl), the 
new contents are shown as expected, so I guess the problem lies in the 
callback somewhere...

Any ideas?


Objektfabrik Joachim Tuchel          mailto:jtuchel at objektfabrik.de
Fliederweg 1                         http://www.objektfabrik.de
D-71640 Ludwigsburg                  http://joachimtuchel.wordpress.com
Telefon: +49 7141 56 10 86 0         Fax: +49 7141 56 10 86 1

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