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How to strip off decimal numbers in js?

Posted on 2009-04-10
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Medium Priority
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Last Modified: 2012-05-06
Hi

I have a aspx and js. I need to let the calculated result of the textbox to strip off the number to have 6 decimal places.

How can I strip off objRec.Fields("countervalue").value ?
e.g. 1/0.9 * 1 = 1.111111111111111

How can it be 1.111111 ?


function Calc(obj) {
          var objRec = xmlindata.recordset;
          if ( objRec ) {
            objRec.absolutePosition = obj.recordNumber;
            var amountVal = eval( objRec.Fields("amount").value )
            var rateVal   = eval( objRec.Fields("rate").value )
            objRec.Fields("countervalue").value = amountVal * rateVal
          }
        }

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Question by:techques
5 Comments
 
LVL 3

Accepted Solution

by:
QualitySoftwareDevelopment earned 150 total points
ID: 24117846
I think this will do it
var num = 10;
var result = num.toFixed(6);  (should return 10.000000)
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LVL 5

Assisted Solution

by:xtravagan
xtravagan earned 150 total points
ID: 24117908
Or if you want to work with a string.

    var dot = n.indexOf('.');
    var str = n;
    if ( dot > 0 )
      str = n.substr(0, dot + 7);

This will truncate, toFixed will round. To use toFixed on a string do this

    var ii = new Number(n);
    var str = "" + ii.toFixed(6);
0
 
LVL 41

Assisted Solution

by:HonorGod
HonorGod earned 150 total points
ID: 24118040
If you would prefer to not lose information, you may want to make use of

Math.round( )..

For example, with something like:

So, if we did:

alert( format( 3.14159, 4 ) )

the output would be 3.1416
function format( val, places ) {
  var mul = Math.pow( 10, places )
  return ( Math.round( val * mul ) / mul ).toFixed( places )
}

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Author Comment

by:techques
ID: 24118081
all are good solution
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LVL 41

Expert Comment

by:HonorGod
ID: 24118121
If all are good, then why a "B"?

Thanks for the assist and points.

Good luck & have a Happy Easter.
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