CODEWITHSUNDEEP
javascriptfloating-accuracy
Laziale
Laziale

Reputation: 8225

Round float values in JavaScript

I am trying to round a value in JS but I am getting not rounded value, this is what I have:

  $(document).on("click", ".open-AddBookDialog", function () {
              var agentPercentage = parseFloat($('#<%=ddlSplitPerc.ClientID%>').val()).toFixed(2);
              var percMod = 1.0 - agentPercentage;
              percMod = Math.ceil(percMod * 100) / 100;
              var dropdownAgentPerc = $('#<%=ddlPercSplitAgent.ClientID %>');
              dropdownAgentPerc.val(percMod);
             dropdownAgentPerc.change();           
             $('#AddNewSplitAgentLife').modal('show');
          });

For example, the agentPercentage is 0.7 and when I am subtracting 1 - 0.7 I am getting this value:

0.30000000000000004

What do you think I should change? I tried the Math.cell example as well but I am getting 0.31 as a result.

Upvotes: 0

Views: 1014

Answers (2)

ken8367
ken8367

Reputation: 1

It should work if you subtract .5 from the value you pass to Math.ceil

percMod = Math.ceil((percMod * 100) -.5 )/ 100;

Math.ceil will round up for any decimal above .000

So to simulate the typical rounding behavior of only rounding decimals above .500 you should subtract .5

Upvotes: 0

jerone
jerone

Reputation: 16861

The solution is in another question already asked: Dealing with float precision in Javascript

(Math.floor(y/x) * x).toFixed(2);

Upvotes: 3

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