OpenEuphoria

1. wxEuphoria: how can I INTERCEPT html link clicks?

• Posted by DanM Jan 07, 2009
• 1046 views
• Last edited Jan 08, 2009

I should preface this question with a demur:
I am NOT trying to build any kind of web "spoof" page, and if that possibility seems too onerous to reply to publicly, then please consider replying directly, to:
euph2005-eudan (atNoSpam) yahoo.com

My question is, in wxEuphoria, using the html window control, is there some way I can intercept a users click on a text link, so program logic can decide what to actually do with the click action, rather than immediately causing a browser to jump to the clicked link?

Dan

3. Re: wxEuphoria: how can I INTERCEPT html link clicks?

• Posted by DanM Jan 08, 2009
• 977 views

Sigh, I spoke too soon. It may be obvious, but it doesn't work.

In the html example, the following code does not actually execute, though it appears to:

procedure on_link_clicked( atom html_win, sequence href, sequence target ) 
   load_html_page( html, href )  
    return  
end procedure 
set_link_event( html, routine_id("on_link_clicked") ) 

That is, if I comment out the "load_html_page" line, it still DOES jump to whatever link is clicked on, and if I put a status bar message output in that procedure, the message doesn't display; those two together tell me that the event handler isn't actually functioning, something else is, and it's the something else that I want to intercept or prevent from occurring, so I can use the clicking on a "link" make something else occur instead.

So, any ideas how I can actually intercept a clicked link?

Dan

5. Re: wxEuphoria: how can I INTERCEPT html link clicks?

• Posted by ghaberek (admin) Jan 09, 2009
• 1028 views

Okay, I got it now...

From wxHtmlWindow docs:

[quote=wxWidgets] Called when user clicks on hypertext link. Default behaviour is to emit a wxHtmlLinkEvent and, if the event was not processed or skipped, call LoadPage and do nothing else. Overloading this method is deprecated; intercept the event instead. [/quote]

So we must do this instead:

procedure on_link_click( atom this, atom event_type, atom id, atom event ) 
 
    atom link 
    sequence href, target 
     
    link = get_link_event_info( event )  -- wxHtmlLinkInfo object 
    href = get_link_href( link )         -- clicked url href 
    target = get_link_target( link )     -- target frame, unused 
     
    -- if the event was not processed or skipped, 
    -- call load_html_page and do nothing else 
     
    load_html_page( html, href ) 
     
end procedure 
set_event_handler( html, get_id(html), wxEVT_COMMAND_HTML_LINK_CLICKED, routine_id("on_link_click") ) 

I had to update wxEuphoria to support this. I've made some other addtions/revisions as well. I'll try to push out a new version ASAP. I guess one release per month wouldn't be too bad...

-Greg

7. Re: wxEuphoria: how can I INTERCEPT html link clicks?

• Posted by ghaberek (admin) Jan 09, 2009
• 965 views

I'm afraid I don't quite get what you're saying. Let me explain the three possible scenarios:

• You handle the event, fetch the href, and pass it to load_html_page. (As my example demonstrates).
  The wxHtmlWindow operates correctly.
• You handle the event, but do not call load_html_page.
  Nothing will happen when the user clicks a link.
• You do not handle the event.
  The wxHtmlWindow operates correctly.

Your event handler may perform any other action to react to the link. The main point is calling load_html_page to allow the link to pass, and not calling it to have it do nothing.

-Greg

9. Re: wxEuphoria: how can I INTERCEPT html link clicks?

• Posted by DanM Jan 09, 2009
• 1001 views

ok, looks like it will do exactly what I want, disregard my immediately previous post

Dan