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[MERGE] adding a rounding method that is compliant with the server side rounding method 

bzr revid: fva@openerp.com-20130409154129-gul9hkn0p4nt24md
This commit is contained in:
Frédéric van der Essen 2013-04-09 17:41:29 +02:00
parent e2e851dd07 a5e4d757a1
commit 174ef7b490
1 changed files with 30 additions and 0 deletions
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30
addons/web/static/src/js/formats.js
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@ -314,4 +314,34 @@ instance.web.auto_date_to_str = function(value, type) {
}
};
/**
* performs a half up rounding with arbitrary precision, correcting for float loss of precision
* See the corresponding float_round() in server/tools/float_utils.py for more info
* @param {Number} the value to be rounded
* @param {Number} a non zero precision parameter. eg: 0.01 rounds to two digits.
*/
instance.web.round_precision = function(value, precision){
if(!value){
return 0;
}else if(!precision){
throw new Error('round_precision(...): Cannot round value: '+value+' with a precision of zero (or undefined)');
}
var normalized_value = value / precision;
var epsilon_magnitude = Math.log(Math.abs(normalized_value))/Math.log(2);
var epsilon = Math.pow(2, epsilon_magnitude - 53);
normalized_value += normalized_value >= 0 ? epsilon : -epsilon;
var rounded_value = Math.round(normalized_value);
return rounded_value * precision;
};
/**
* performs a half up rounding with a fixed amount of decimals, correcting for float loss of precision
* See the corresponding float_round() in server/tools/float_utils.py for more info
* @param {Number} the value to be rounded
* @param {Number} the number of decimals. eg: round_decimals(3.141592,2) -> 3.14
*/
instance.web.round_decimals = function(value, decimals){
return instance.web.round_precision(value, Math.pow(10,-decimals));
};
};