trim to 2 decimals_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-03-16 12:18 出处：网络

I have: onclick=\"document.getElementById(\'field1\').value = Math.round((parseFloat(document.getElementById(\'field2\').value,2)*100))/100 +

相关专题：javascript

I have:

onclick="document.getElementById('field1').value = 
Math.round((parseFloat(document.getElementById('field2').value,2)*100))/100 + 
Math.round((parseFloat(document.getElementById('field3').value,2)*100))/100;"

Most numbers round ok to 2 decimal points which is what I need.

However, with an example like

onclick="document.getElementById('field1').value = 
Math.round((parseFloat(document.getElementById('21.29').value,2)*100))/100 + 
Math.round((parseFloat(document.getElementById('54.70').value,2)*100))/100;"

Field 1 is returning 75.99000000000001 How can I trim to 75.99 con开发者_运维技巧sistently?

var num = 5 / 6;

var display = num.toFixed(2)

num outputs: 0.8333333333333334

display outputs: "0.83"

How about this:

parseFloat(document.getElementById('21.29').toFixed(2));

The toFixed method should take care of the rounding nicely for you.

Use the method toFixed(2) to fix it at 2 decimal places:

(Math.round((parseFloat(document.getElementById('21.29').value,2)*100))/100 + 
  Math.round((parseFloat(document.getElementById('54.70').value,2)*100))/100).toFixed(2);

I had a similar issue - where I do not wanted to round the value but trim upto 2 decimals

I got the perfect solution for by writing this function and using where ever needed to trim upto 2 decimals

function upto2Decimal(num) {
    if (num > 0)
      return Math.floor(num * 100) / 100;
    else
      return Math.ceil(num * 100) / 100;
  }

if you call

upto2Decimal(2.3699) or upto2Decimal(-2.3699)
// returns 2.36 or -2.36

check this solution using your JS console of the browser

You can use :

function myFunction() 
{
      var num = "-54.987656";
    var roundedValue = roundMethod(num,5);   
    document.getElementById("demo").innerHTML = roundedValue;
}
function roundMethod(numberVal, roundLimit) // This method will not add any additional 0, if decimal places are less than the round limit
{
    var isDecimal = numberVal.indexOf(".") != -1;    
  if(isDecimal)
  {
      if(numberVal.split(".")[1].length > roundLimit)
      {
        return parseFloat(numberVal).toFixed(roundLimit).toString();    
      }else
      {
          return numberVal;
      }
  }else
  {
      return numberVal;
  } 
}

<html>
<body>

<p>Click the button to display the fixed number.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>
</body>
</html>

trim to 2 decimals

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