Topic: how to handle btc in javascript (Read 3767 times)
This is an old thread people! Issue was solved...
maybe this helps: https://en.bitcoin.it/wiki/Proper_Money_Handling_(JSON-RPC)
not directly related to javascript but I store as decimal ( 16, 8 ) on MySQL
not directly related to javascript but I store as decimal ( 16, 8 ) on MySQL
Also, consider using one of the Bitcoin javascript frameworks. Bitcore is pretty cool, works both server-side and client-side.
maybe this helps: https://en.bitcoin.it/wiki/Proper_Money_Handling_(JSON-RPC)
not directly related to javascript but I store as decimal ( 16, 8 ) on MySQL
not directly related to javascript but I store as decimal ( 16, 8 ) on MySQL
Using integers is the correct way. You only use floats if you don;t know how many decimal places there are.
Update: for your above..
parseFloat("15854420.40053001").toFixed(
;
parseFloat("15854420.40053001").toFixed(
;
your toFixed8 got converted to a smiley. I've used both methods, the float and just integer and count satoshis. I like the satoshi approach more when storing in my DB IMO. I agree. Usually use integers too. And I think I remember blockchain.info's API also works that way.
Update: for your above..
parseFloat("15854420.40053001").toFixed(;
parseFloat("15854420.40053001").toFixed(
; your toFixed8 got converted to a smiley. I've used both methods, the float and just integer and count satoshis. I like the satoshi approach more when storing in my DB IMO.
Update: for your above..
parseFloat("15854420.40053001").toFixed(;
parseFloat("15854420.40053001").toFixed(
;
I know this is kind of something you can google yourself (or probably have), but here's a couple SO links with some more info.
http://stackoverflow.com/questions/1458633/elegant-workaround-for-javascript-floating-point-number-problem
http://stackoverflow.com/questions/2876536/precise-financial-calculation-in-javascript-what-are-the-gotchas
http://floating-point-gui.de/languages/javascript/
FWIW, I typically use parseFloat, then toFixed(2) when trying to convert to currency format. Of course this depends on the precision required though.
Example: parseFloat("23432.234324").toFixed(2); //"23432.23"
http://stackoverflow.com/questions/1458633/elegant-workaround-for-javascript-floating-point-number-problem
http://stackoverflow.com/questions/2876536/precise-financial-calculation-in-javascript-what-are-the-gotchas
http://floating-point-gui.de/languages/javascript/
FWIW, I typically use parseFloat, then toFixed(2) when trying to convert to currency format. Of course this depends on the precision required though.
Example: parseFloat("23432.234324").toFixed(2); //"23432.23"
Seems like parseFloat is good:
parseFloat("15854420.40053001")
Outputs the correct value and then I can multiply this value for 100,000,000 to make operations, right?
parseFloat("15854420.40053001")
Outputs the correct value and then I can multiply this value for 100,000,000 to make operations, right?
Multiply it up by 100,000,000 and use integers to just count satoshis. If you're handling > 10 BTC you'll want to check that it's using 64bit integers or equivalent.
In Javascript everything is floating point and I believe you get 53 bits of integer range so you'll safely handle 90,071,992 bitcoins (52bits) which should be more than enough for the 21 million out there.
alert([Number.MAX_VALUE, Number.MIN_VALUE]);
In Javascript everything is floating point and I believe you get 53 bits of integer range so you'll safely handle 90,071,992 bitcoins (52bits) which should be more than enough for the 21 million out there.
alert([Number.MAX_VALUE, Number.MIN_VALUE]);
Internally bitcoin are handled as satoshi, thus there are no "float-problems". A division could still result in problems because e.g. 100k Satoshi / 3 would result in 333333 which might not be correct depending on your use case.
And so, how can be resolved this issue ? Thank you 
Internally bitcoin are handled as satoshi, thus there are no "float-problems". A division could still result in problems because e.g. 100k Satoshi / 3 would result in 333333 which might not be correct depending on your use case.
If I have a string like "0.059" and I want to convert it to a number to do some operations like a division, can I in javascript simply convert it with parseFloat("0.059") or it could have some precisions problems, while executing a division for example ?
Secondly, how to correctly save and handle bitcoins values in php and mysql ?
Secondly, how to correctly save and handle bitcoins values in php and mysql ?
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