Digital Workshop

Still working on using math formulas in an HTML5 pub. Ran into a problem with parseInt which is in the formula being used. Firebug shows the following on the page where parseInt is used:



The part of the math formula that would benefit from a work around is:



So far, not sure if a work around can be created? Any help appreciated.

Don't need a work around just an understanding of OOP. parseInt is a window method - so just call that object first.


</mack>

Mack,

I've got this long math formula in a page script object, not a JavaScript object. Adding the window. prefix to this single function didn't work.

Since the JavaScript has many, many functions (probably a hundred lines-AES Crypto formula for example, http://www.fourmilab.ch/javascrypt/index.html to encrypt/decrypt health-sensitive data), I'm wondering if the entire formula needs to be put into an external JS file, attached to Opus in the advanced publishing dialog through src, then calling the key functions to run it? Probably would need to re-write/prefix every function (25+) with window(.function)?

Interestingly, since its pure JS, it does work in Opus, in a standard page script object, if the Opus pub is an EXE, but not if it is published in Opus to HTML5.

So, even though watched YouTube video, still not quite sure how to do this?

Yes, the different scopes and contexts involved in adding vanilla JavaScript to Opus-converted-to-JavaScript can cause advanced code to become easily confused.

Placing it in an external JS file makes it much easier to work out what is running from where. If practical terms, I would recommend passing all values needed by the function as parameters and then returning the result to a publication variable.

</mack>

Played some more, but not getting this to work. Too complicated for me, so will try another approach to securing the few pieces of data.

Much thanks again.

Working example:

http://www.live.interaktiv.co.uk/?secti ... evine.info

</mack>

Mack,

OK, got the sample to work.

So, maybe I can just "dump" the (multi-line, multi-function) JavaScript for the crypto into a JS external file, try to run it similarly? This JavaScript does contain parseInt in one of the functions.

I will try it.

You did include the interaktiv.js file with the published files?

</mack>

Must have crossed paths in cyberspace. Yes, forgot to put the external JS in the export folder. Once done, worked fine.

But did try what I mentioned in last posting: dumped the crypto JS into an external JS file, set up (for my project) the Publishing>Advanced>Head addition the same (src...) and when viewed after publishing, got a black screen.

At this point, after struggling for a couple of days, am thinking it may be easier (though not as secure, would prfer AES 128 or higher) to find online a XOR basic JS (the data are both words and numbers, so word only substitution won't work) to encode/obfuscate the data, decode it back to plain text and numbers, as needed. Did some searching but so far haven't found a really simple XOR in JS like this.

It's the same principle as all the other examples:

Opus HTML: http://www.live.interaktiv.co.uk/?secti ... evine.info

Source: http://cryptojs.altervista.org/api/#AES

</mack>

Thank you very much! I had seen mention of Google's (?) crypto.js but had steered away because I suspected (without actually looking at it ) that it would be way beyond my capability.

From your sample IMP, actually pretty straightforward implementation. Potentially helpful to secure user-generated health-sensitive data they choose to save or share.

Again, thank you.

Thanks for sharing, but is there a way to still get this file? It seems to be broken at the moment.

Hi Jez,

Interaktiv have recently moved hosting providers and due to technical issues, some of the website features are currently unavailable. The issue is being looked into.

Regards,

Mack

Okay, it seems that if something needs doing, don't ring hosting support, do it your self

I think I've fixed it. Downloads should now work. I still need to check other parts of the site - so let me know if anything else is missing.

</mack>

Thanks Mack, I've been able to download your file now.