Validate 2 decimal places javascript

I currently have a number input script that behaves similar to a calculator with the way numbers are displayed, but I want to stop the adding of additional numbers to the series after two numbers past the decimal point.

Here is what I have so far, though the limiting doesn't occur correctly.

It should work like this:

1.25 - Allowed

12.5 - Allowed

125.5 - Allowed

125.55 - Allowed

123.555 - Not Allowed

rText = document.getElementById["resultText"];

function selectNumber[num] {
if [!rText.value || rText.value == "0"] {
    rText.value = num;
}
else {

this part works...

        rText.value += num;

    }
  }
}

but this part doesn't work... Any ideas???

if [rText.value.length - [rText.value.indexOf["."] + 1] > 2] {

        return false;
    } else {
        rText.value += num;

    }
  }
}

asked Sep 20, 2017 at 12:08

var validate = function[e] {
  var t = e.value;
  e.value = [t.indexOf["."] >= 0] ? [t.substr[0, t.indexOf["."]] + t.substr[t.indexOf["."], 3]] : t;
}

answered Sep 20, 2017 at 12:32

Brahma DevBrahma Dev

1,8451 gold badge12 silver badges18 bronze badges

1

Save the previous value in some data attribute and if it exceeds 2 decimal places then restore the previous value

The 2 decimal places can be checked using Math.round[tis.value*100]/100!=tis.value

Note:

I have used oninputto validate even in copy paste scenarios

function restrict[tis] {
  var prev = tis.getAttribute["data-prev"];
  prev = [prev != ''] ? prev : '';
  if [Math.round[tis.value*100]/100!=tis.value]
  tis.value=prev;
  tis.setAttribute["data-prev",tis.value]
}

answered Sep 20, 2017 at 12:24

jafarbtechjafarbtech

6,4871 gold badge34 silver badges53 bronze badges

1

I love to use Math.floor and toFixed[] to resolve my decimal issues.

Here is a example:

var value = 123.5555
var roundedNumber = [Math.floor[value * 100] / 100].toFixed[2]

roundedNumber will be "123.55" as a string. So if you want as a number just add:

var value = 123.5555
var roundedNumber = Number[[Math.floor[value * 100] / 100].toFixed[2]]

and now you have value as a number and fixed to up 2 decimal places.

answered Sep 20, 2017 at 12:21

marquesm91marquesm91

5256 silver badges22 bronze badges

2

Just copy paste this method and call this method on your respective button on which button you have to check this decimal validation.

function CheckDecimal[inputtxt]   
  {   
  var decimal=  /^[-+]?[0-9]+\.[0-9]+$/;   
  if[inputtxt.value.match[decimal]]   
    {   
    alert['Correct, try another...']  
    return true;  
    }  
  else  
    {   
    alert['Wrong...!']  
    return false;  
    }  
  }

Mister Jojo

17.8k3 gold badges16 silver badges39 bronze badges

answered Sep 20, 2017 at 12:40

I need validation on Rate like example

1-True

1.00-True

1.56-True

Means I need numeric values + point only

Validate two Decimal numbers with two decimal places using RegularExpression in JavaScript and jQuery

Download FREE API for Word, Excel and PDF in ASP.Net: Download

Hi amar,

Refer below sample code.

Javascript

    
    
        function ValidateDecimal[ele] {
            //var regex = /^\d+[\.\d{1,2}]?$/;
            var regex = /[?:\d*\.\d{1,2}|\d+]$/;
            if [regex.test[ele.value]] {
                alert["Valid"];
            } else {
                alert["Invalid"];
            }
        }
    


    
    

        
    
    

Demo

jQuery

    
    
    
        $[function [] {
            $["#txtText"].on["blur", function [] {
                //var regex = /^\d+[\.\d{1,2}]?$/;
                var regex = /[?:\d*\.\d{1,2}|\d+]$/;
                if [regex.test[$[this].val[]]] {
                    alert["Valid"];
                } else {
                    alert["Invalid"];
                }
            }];
        }];
    


    
    

        
    
    

Demo

How do I get 2 decimal places in JavaScript?

How do I limit decimal places in JavaScript?

What is the use of toFixed 2 in JavaScript?

How do you round a double value to 2 decimal places in JavaScript?