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Top Forums Web Development Javascript to force decimals in 0.25 steps Post 302918538 by barrydocks on Wednesday 24th of September 2014 03:40:46 AM
Old 09-24-2014
Javascript to force decimals in 0.25 steps

I have a few input values on a form that must be in 0.25 steps, how do I force this ? alternatively how do I automatically enter the correct vales as the user types and disallow any other values ie: as the firstnumber is typed (say 3) then .00 is added, then as the decimal point and the first decimal value is entered which must be either 0, 2, 5 or 7 then the appropriate second decimal is added which would be 0 or 5 as appropriate. I guess I will need an alert for any other values that might be entered in error?

I have googled and there are plenty of solutions to round to the nearest decimal but not to actually force 0.25 steps
I am sorry, I have absolutely no idea where to startSmilie
 

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fe_dec_setround(3M)													       fe_dec_setround(3M)

NAME
fe_dec_setround() - set decimal floating-point rounding direction mode SYNOPSIS
DESCRIPTION
The function establishes the decimal rounding direction represented by its argument round. The round argument must equal one of the macros (defined in and If the argument does not match a decimal rounding direction macro, the decimal rounding direction is not changed. The default decimal rounding direction mode is round to nearest with half-way cases away from zero These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward. USAGE
To use this function, compile with the option. Make sure your program defines and then includes Specify on the compiler command line or place the call to this function under the effect of an affirmative pragma: If the pragma is placed outside of any top-level declarations in a file, the pragma will apply until another pragma is encountered or until the end of the file is reached. If the pragma is placed at the beginning of a block (compound statement), the pragma will apply until another pragma is encountered or until the end of the block is reached. Link in the math library by specifying or on the linking command line. For more information, see the at the following site: RETURN VALUE
The function returns a zero value if and only if the argument is equal to a decimal rounding direction macro. SEE ALSO
fe_dec_getround(3M), fenv(5). STANDARDS CONFORMANCE
This function conforms to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic". fe_dec_setround(3M)
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