Re: How to display JavaScript's values in ConTeXt

[Peter Rolf <indiego@gmx.net>]

Zhichu Chen wrote:
> Thank you very much Peter.
> 
> I've inserted these code and when I open my pdf file in Acrobat
> Reader, it crashed :(. But this is not a big deal, I modified it and
> it's working, but it only tells me that:
> do_digit(7) at page 0

First thing to say: I'm also a javascript beginner (used it only once!),
so don't expect too much from me :)

In the following code the missing vars and function are added
(javascript debugger), but still the initialisation ('undefined' text)
and the reset for the result field are missing (and who knows what
else). But it's a 'working' starting point.

\startJSpreamble functions used now
  function do_digit(d)
    {console.println("do_digit("+d+") at page "+[this.pageNum]);
     Stack[Level] += String(d);
     do_refresh(Level) }

  var Stack = new Array();
  var Level = 1 ;

  function do_refresh (i) { vv = this.getField("Stack.".concat(i)) ;
  if (vv) { vv.value = Stack[i] ;
  vv.readonly = (i!=Level) ;
  this.dirty = false } }
\stopJSpreamble

> and the field never changes. I guess I have to specify some link
> between the JavaScript variant and the ConTeXt. Can you give me just
> one simplest example that shows JavaScript code
> var tempstring = "Yes";
> in pdf file? Or you could think I'm very boring so can you just
> suggest some materials that I can find these techniques?
>
I have not used text fields before (so no example code) and this is all
I have about JavaScript:

http://devedge-temp.mozilla.org/library/manuals/2000/javascript/1.3/reference/


from http://partners.adobe.com/public/developer/pdf/topic_js.html:

http://partners.adobe.com/public/developer/en/acrobat/sdk/pdf/javascript/AcroJS.pdf
http://partners.adobe.com/public/developer/en/acrobat/sdk/pdf/javascript/AcroJSGuide.pdf
http://partners.adobe.com/public/developer/en/acrobat/sdk/pdf/javascript/AcroJSRefErrata.pdf

BUT MOST IMPORTANT:

http://partners.adobe.com/public/developer/en/pdf/debugger.js

Description:
"Use this file to enable the JavaScript Debugger in Adobe Reader, as
described in the Acrobat JavaScript Scripting Guide."

Hope that helps,

Peter

> From: Peter Rolf <indiego@gmx.net>
> To: mailing list for ConTeXt users <ntg-context@ntg.nl>
> Date: Tue, 05 Sep 2006 11:42:44 +0200
> Subject: Re: [NTG-context] How to display JavaScript's values in ConTeXt
> Zhichu Chen wrote:
>> Hello everybody,
>>
>>     I want to add a clock which shows the system time to a pdf file.
>> And I have read the ``art-calc.pdf'' and ``mwidget-p.pdf'' to find
>> some approaches but failed shamely. I am indeed new at ConTeXt and
>> JavaScript. Before I'm shocked by ConTeXt, I used LaTeX for about 2
>> years, so I'm confused with the conventions between ConTeXt and LaTeX.
>> My code is here:
>>
> I don't have the time right now for more than this short tip. If you
> work with JavaScript you should open the JaveScript Debugger (CTRL-J in
> Acrobat; in the Adobe Reader hit CTRL-K and check "Show console on
> errors and messages" in the JavaScript categorie) to see the warnings
> and error messages. You also should insert some log messages in your
> code. For example
> 
> console.println("do_digit("+d+") at page "+[this.pageNum]);
> 
> at the start of your function do_digit. This helps a lot to see what is
> going on.
> 
> Greetings, Peter
> 
>> ----------------------------------------------------------------------------------
>> \setupinteraction[state=start]
>>
>> \startJSpreamble functions used now
>>   function do_digit(d)
>>     { Stack[Level] += String(d);
>>       do_refresh(Level) }
>> \stopJSpreamble
>>
>> \startJScode{digit}
>>   do_digit(JS_S_1);
>> \stopJScode
>>
>> \definefield[Stack.1][line][Results][][
>>
>> \setupfield
>>   [Results]
>>   [horizontal,frame]
>>   [width=fit,
>>    height=2cm,
>>    frame=on]
>>   [height=18pt,width=80pt,align=middle,frame=off]
>>   [height=18pt,width=80pt,color=red,align=right,style=type,frame=off]
>>
>> \setupbuttons [background=infobutton]
>>
>> \starttext
>>
>> Click \button{7}[JS(digit{7})] will get
>> \field[Stack.1]
>>
>> \stoptext
>> --------------------------------------------------------------------------------
>>
>> I only copied these codes from "art-calc.pdf" so there must be some
>> other critical concepts that I haven't realized. Please point them to
>> me. Thanks
>> _______________________________________________
>> ntg-context mailing list
>> ntg-context@ntg.nl
>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>
>>
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