how to transfer session.variables between Javascript on HTML-page?

[Ren� Stout]

Hello,
I need a Javascript tot calculate a SHA-1 hash.
Problem is: I have no knowledge in this aresa. Please tell me how to accomplish that the script uses a session.variable for input and how I get the output into another session.variable.

<!-- Java script for SHA-1 calculation -->
<!-- Session.__Protected__SHAString contains the string to be hashed ('msg' in the Javascript) -->
<!-- Session.__protected__SHAHash must contain the resulting hash from the script (the returned string) --> 

<script type="text/javascript"> 
        /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
/*  SHA-1 implementation in JavaScript | (c) Chris Veness 2002-2010 | www.movable-type.co.uk      */
/*   - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html                             */
/*         http://csrc.nist.gov/groups/ST/toolkit/examples.html                                   */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */

var Sha1 = {};  // Sha1 namespace

/**
 * Generates SHA-1 hash of string
 *
 * @param {String} msg                String to be hashed
 * @param {Boolean} [utf8encode=true] Encode msg as UTF-8 before generating hash
 * @returns {String}                  Hash of msg as hex character string
 */
Sha1.hash = function(msg, utf8encode) {
... the script itself...

[Ren� Stout]

Re: how to transfer session.variables between Javascript on HTML-page?

I Found the way to use a session.variable in Java Script here.

But how do I transfer the output of the script to a session.variable?

The script ends like this:

       return String.fromCharCode(cc); }
    );
  return strUni;
}

[Ren� Stout]

Re: how to transfer session.variables between Javascript on HTML-page?

But how do I transfer the output of the script to a session.variable?

Or to a HTML hidden name field?

[frankbicknell]

Re: how to transfer session.variables between Javascript on HTML-page?

What I do is do an ajax callback to a user defined function that sets a session variable. I am not sure this is the best way. It seems like a lot of work just to set a variable, but it does work. This is assuming you have to get the variable from the client to the server. Hopefully you can make this work for your process.

Here is an example of the javascript event. Note you have to add an under-bar to the beginning variable you want to sent to the xbasic function.

var rowNum = {Grid.Object}._selectedRow;
var vsnJID ={grid.Object}.getValue('G','JID',rowNum);
{grid.Object}.ajaxCallback('G',rowNum,'SetJIDSessionVariable','','_vsnJID='+vsnJID);

Here if the xbasic function. The variable passed from the javascript event is contained in the e object.

FUNCTION SetJIDSessionVariable as c (e as p)
	dim e.session.snJID as n
	IF eval_valid("e._vsnJID")
		e.session.snJID = e._vsnJID
'		SetJIDSessionVariable = "alert('You submitted a value of: " + js_escape(e.session.snJID) + "');"
	END IF
END FUNCTION

[Davidk]

Re: how to transfer session.variables between Javascript on HTML-page?

Depending on your needs, getting at the session.variables through <%a5 ?session.variables %> may work for you, but the value in this session.variable gets sets only when the page gets rendered, and not again.

Once you've done your work in JS you could then do a {grid.Object}.setValue to set a hidden field on your grid.

The grid Events can then be used to get at that hidden field.

[Ren� Stout]

Re: how to transfer session.variables between Javascript on HTML-page?

Thanks guys,
I'm mixing up things, I guess. What I want to achieve: in a grid CanUpdate event I want to use session.vars. Some feed a javascript function, another should get the value of the output of the function.
After that, the session.vars are used in fields in a form on a HTML-page.
My challenge is:
I have no knowledge of how to implement a javascript function in an Event and how to retrieve the result into a session.var.