Formatting numbers in E notation with exponent > 20 or <-20 fails

[Luciano]

Hello.

I have stumbled upon a problem when trying to format numbers which are in E notation with very large exponents.

Please look at the example below where the first number is correctly formatted while the second one produces an exception.

kendo.toString(5e15, "#,0.00")
"5,000,000,000,000,000.00"
kendo.toString(5e25, "#,0.00")
RangeError: toFixed() digits argument must be between 0 and 20

Same behavior can be observed for negative exponents:

kendo.toString(5e-20, "#,0.00")
"0.00"
kendo.toString(5e-21, "#,0.00")
RangeError: toFixed() digits argument must be between 0 and 20

I believe the problem is in your round function where it is returning "value.toFixed(precision);" The native Number.toFixed function appears to be limited to a maximum of 20 digits which makes formatting of above numbers break.

Could you please implement a fix which removes this limitation?


Thanks.

[Kiril Nikolov]

Hi Luciano,

As this is a well known limitation of the Number.prototype.toFixed() implementation there is nothing that we can do to in order to work around it. Currently the round method relies on toFixed() to adjust the precision of the numbers. 

If you think that the current implementation needs improvement, please check our UserVoice section, where you can post this as a suggestion for improvement and if it gets popular a change will be implemented. 

Regards,
Kiril Nikolov
Telerik