[Laszlo-dev] How can I use fscommand in Laszlo?

[P T Withington]

Calling flash built-ins is not a supported feature, but I believe:

   {
     #pragma 'flashCompilerCompatibility=true'
     fscommand(command, arg);
   }

Will work.

On 7 Nov 2005, at 09:42, Asger Alstrup wrote:

> Hi,
>
> We're working on a mind-mapping application in Laszlo, where the  
> users can create mindmaps`on the web. As part of this, we need to  
> communicate between the browser and flash. We currently do this  
> using the Laszlo API for this, which translated into a  
> "getUrl:javascript" call. This works well, and we are happy about it.
>
> At the same time, we use the HTML browser feature "onbeforeunload"  
> which allows you to prevent the user from navigating away from a  
> web-page by accident. This is great for making sure that users do  
> not loose their work: Before the browser "unloads" a page, it asks  
> the user for confirmation.
>
> The problem is that the Laszlo browser API (the getUrl call) is  
> considered an "unload" event by the browser, so each time we  
> communicate with the browser from Laszlo, the warning pops up. In  
> browser-side javascript, it is possible to remove the  
> unbeforeunload handler, to prevent this from happying, but we need  
> a way to communicate from flash to the browser, that does not  
> interfere with this flag.
>
> Now, flash 7 provides the fscommand which also allows you to  
> communicate with the browser. This method is very much crippled  
> compared to the geturl- javascript solution, but nevertheless we  
> would very much like to use this in this particular case, because  
> it would allow us to disable the onbeforeunload handler, and then  
> use the geturl method to do the browser-communication, which could  
> then afterwards re-enable the onbeforeunload handler in the browser.
>
> So the question is simply:
>
> How can I use fscommand from Laszlo?
>
> In the forums, there have been some examples posted, but none of  
> these work with Laszlo 3.0.2 - either they do not do anything, or  
> they crash the browser in an infinite loop. We are ready to do some  
> lifting to get this to work, since it is a crucial feature in our  
> application, but how can it be done?
>
> Alternatively, Flash 8 provides much more extensive browser  
> integration features (http://www.communitymx.com/content/ 
> article.cfm?cid=0922A). Are there plans to support this in Laszlo  
> as an alternative to the getUrl method?
>
> Thanks in advance,
> Asger Ottar Alstrup
> Laerdal Sophus
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