Sorry for replying to a years-old thread, but I have a solution to this
problem. The OP had a math card that generated a math problem with
JavaScript, and he wanted the randomly generated question to match the
randomly generated solution. Although Mnemosyne doesn't let the front and
back sides of a card pass data to each other, we can bypass the issue if
the front and back use identically seeded pseudo-RNGs, e.g. by using
today's date as the seed. In this manner, the front and back will always
produce matching randomly generated equations.
Here is an example for a "front-to-back only" card. First, the front:
Add these numbers:
<script language="JavaScript">
//FRONT OF CARD
function Random() { seed = seed * 48271 % 2147483647; return seed; }
//Lehmer MINSTD
const d = new Date();
_cardsalt = 879; //arbitrary card-specific number to stop other cards in
the deck from sharing RNG
seed = d.getDate()+d.getMonth()+_cardsalt; //hash today's date
Random(); Random(); //burn the first couple random numbers
aVal=Random()%900000+100000;
bVal=Random()%900000+100000;
cVal = aVal+bVal;
document.write(aVal + " + " + bVal + " = ???<br>"); //This is the only line
that differs front vs back
</script>
Then, the back:
Add these numbers:
<script language="JavaScript">
//BACK OF CARD
function Random() { seed = seed * 48271 % 2147483647; return seed; }
//Lehmer MINSTD
const d = new Date();
_cardsalt = 879; //arbitrary card-specific number to stop other cards in
the deck from sharing RNG
seed = d.getDate()+d.getMonth()+_cardsalt; //hash today's date
Random(); Random(); //burn the first couple random numbers
aVal=Random()%900000+100000;
bVal=Random()%900000+100000;
cVal = aVal+bVal;
document.write(aVal + " + " + bVal + " = " + cVal + "<br>"); //This is the
only line that differs front vs back
</script>
I believe this method generalizes to any randomized math-based flashcards.
On Saturday, March 2, 2019 at 5:25:16 AM UTC-6 [email protected] wrote:
> Hello,
>
> I was lazy and figured out that I can add the answer in the Front, if I
> simply make it invisible by using "color:white". When I need to check my
> answer, I can select the white text and see if I'm correct or not.
>
> The Back then is left either empty, or contains some general explanation
> related to the question.
>
> Best wishes,
> Ilmars
>
>
> On Friday, March 1, 2019 at 10:26:02 AM UTC+2, Peter Bienstman wrote:
>
>> Hi,
>>
>>
>>
>> I’m not sure if this will work out of the box, I suggest you try it.
>>
>>
>>
>> In any case, it’ll certainly be possible to achieve this by writing a
>> plugin for a custom Renderer and/or CardType.
>>
>>
>>
>> To see how Mnemosyne assembles html, see here:
>>
>>
>> https://github.com/mnemosyne-proj/mnemosyne/blob/master/mnemosyne/libmnemosyne/renderers/html_css.py
>>
>>
>>
>> Cheers,
>>
>>
>>
>> Peter
>>
>> *From:* [email protected] <[email protected]> *On
>> Behalf Of *Ilmars Cirulis
>> *Sent:* 28 February 2019 22:39
>> *To:* mnemosyne-proj-users <[email protected]>
>> *Subject:* [mnemosyne-proj-users] How to change card's Back from Front
>> using JavaScript?
>>
>>
>>
>> Hello!
>>
>>
>> If I want to add some element to Back, using JavaScript in Front, is it
>> possible?
>> I added an ilustration in the attachment.
>>
>>
>>
>> Best wishes,
>> Ilmars
>>
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