Hướng dẫn parsefloat javascript 2 decimal

I have the following code. I would like to have it such that if price_result equals an integer, let’s say 10, then I would like to add two decimal places. So 10 would be 10.00. Or if it equals 10.6 would be 10.60. Not sure how to do this.

price_result = parseFloat(test_var.split('$')[1].slice(0,-1));
Hướng dẫn parsefloat javascript 2 decimal

asked Dec 14, 2010 at 1:41

user357034user357034

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You can use
toFixed() to do that

var twoPlacedFloat = parseFloat(yourString).toFixed(2)

bob esponja

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answered Dec 14, 2010 at 1:44

Mahesh VelagaMahesh Velaga

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9

When you use toFixed, it always returns the value as a string. This sometimes complicates
the code. To avoid that, you can make an alternative method for Number.

Number.prototype.round = function(p) {
  p = p || 10;
  return parseFloat( this.toFixed(p) );
};

and use:

var n = 22 / 7; // 3.142857142857143
n.round(3); // 3.143

or simply:

(22/7).round(3); // 3.143

kangax

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answered Aug 6, 2013 at 21:04

VladaVlada

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5

To return a number, add another layer of parentheses. Keeps it clean.

var twoPlacedFloat = parseFloat((10.02745).toFixed(2));

answered Nov 19, 2014 at 22:07

pvanallenpvanallen

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If your objective is to parse, and your input might be a literal, then you’d expect a float and toFixed won’t provide that, so here are two simple functions to
provide this:

function parseFloat2Decimals(value) {
    return parseFloat(parseFloat(value).toFixed(2));
}

function parseFloat2Decimals(value,decimalPlaces) {
    return parseFloat(parseFloat(value).toFixed(decimalPlaces));
}

answered Nov 17, 2017 at 9:54

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SavageSavage

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3

ceil from lodash is probably the best

_.ceil("315.9250488",2) 
_.ceil(315.9250488,2) 
_.ceil(undefined,2)
_.ceil(null,2)
_.ceil("",2)

will work also with a number and it’s safe

answered Apr 27, 2018 at 8:36

Antonio TerrenoAntonio Terreno

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1

You can use .toFixed() to for float value 2 digits

Exampale

let newValue = parseFloat(9.990000).toFixed(2)

//output
9.99

answered Apr 20, 2020 at 0:00

RizwanRizwan

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1

Please use below function if you don’t want to round off.

function ConvertToDecimal(num) {
    num = num.toString(); //If it's not already a String
    num = num.slice(0, (num.indexOf(".")) + 3); //With 3 exposing the hundredths place
   alert('M : ' +  Number(num)); //If you need it back as a Number    
}

answered Apr 19, 2016 at 9:29

Hướng dẫn parsefloat javascript 2 decimal

NimeshNimesh

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1

I have tried this for my case and it’ll work fine.

var multiplied_value = parseFloat(given_quantity*given_price).toFixed(3);

Sample output:

9.007

derloopkat

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answered Jul 25, 2020 at
13:09

Hướng dẫn parsefloat javascript 2 decimal
parseFloat(parseFloat(amount).toFixed(2))

You have to parse it twice. The first time is to convert the string to a float, then fix it to two decimals (but the toFixed returns a string), and finally parse it again.

answered Aug 29 at 5:34

MattMatt

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For what its worth: A decimal number, is a decimal number, you either round it to some other value or not. Internally, it will approximate a decimal fraction according to the rule of floating point
arthmetic and handling. It stays a decimal number (floating point, in JS a double) internally, no matter how you many digits you want to display it with.

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To present it for display, you can choose the precision of the display to whatever you want by string conversion. Presentation is a display issue, not a storage thing.

answered Aug 8, 2016 at 10:37

andoraandora

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@sd Short Answer: There is no way in JS to have Number datatype value with trailing zeros after a decimal.

Long Answer: Its the property of toFixed
or toPrecision function of JavaScript, to return the String. The reason for this is that the Number datatype cannot have value like a = 2.00, it will always remove the trailing zeros after the decimal, This is the inbuilt property of Number Datatype. So to achieve the above in JS we have 2 options

  1. Either use data as a string or
  2. Agree to have truncated value with case ‘0’ at the end ex 2.50 -> 2.5.
    Hướng dẫn parsefloat javascript 2 decimal

answered Jul 3, 2019 at 7:17

1

You can store your price as a string

You can use Number(string)

for your calculations.

example

Number("34.50") == 34.5

also

Number("35.65") == 35.65

If you’re comfortable with the Number function , you can go with it.

answered Mar 16, 2021 at 15:25

Hướng dẫn parsefloat javascript 2 decimal

1

Try this (see comments in code):

function fixInteger(el) {
    // this is element's value selector, you should use your own
    value = $(el).val();
    if (value == '') {
        value = 0;
    }
    newValue = parseInt(value);
    // if new value is Nan (when input is a string with no integers in it)
    if (isNaN(newValue)) {
        value = 0;
        newValue = parseInt(value);
    }
    // apply new value to element
    $(el).val(newValue);
}

function fixPrice(el) {
    // this is element's value selector, you should use your own
    value = $(el).val();
    if (value == '') {
        value = 0;
    }
    newValue = parseFloat(value.replace(',', '.')).toFixed(2);
    // if new value is Nan (when input is a string with no integers in it)
    if (isNaN(newValue)) {
        value = 0;
        newValue = parseFloat(value).toFixed(2);
    }
    // apply new value to element
    $(el).val(newValue);
}
Hướng dẫn parsefloat javascript 2 decimal

arghtype

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answered Jul 23, 2014 at 10:26

Solution for FormArray controllers 

Initialize FormArray form Builder

  formInitilize() {
    this.Form = this._formBuilder.group({
      formArray: this._formBuilder.array([this.createForm()])
    });
  }

Create Form

  createForm() {
    return (this.Form = this._formBuilder.group({
      convertodecimal: ['']
    }));
  }

Set Form Values into Form Controller

  setFormvalues() {
    this.Form.setControl('formArray', this._formBuilder.array([]));
    const control = <FormArray>this.resourceBalanceForm.controls['formArray'];
    this.ListArrayValues.forEach((x) => {
      control.push(this.buildForm(x));
    });
  }

  private buildForm(x): FormGroup {
    const bindvalues= this._formBuilder.group({
      convertodecimal: x.ArrayCollection1? parseFloat(x.ArrayCollection1[0].name).toFixed(2) : '' // Option for array collection
// convertodecimal: x.number.toFixed(2)    --- option for two decimal value 
    });

    return bindvalues;
  }

answered Dec 30, 2018 at 8:45

Hướng dẫn parsefloat javascript 2 decimal

Simple JavaScript, string to float:

var it_price = chief_double($("#ContentPlaceHolder1_txt_it_price").val());

function chief_double(num){
    var n = parseFloat(num);
    if (isNaN(n)) {
        return "0";
    }
    else {
        return parseFloat(num);
    }
}

answered Oct 30, 2015 at 6:20

Hướng dẫn parsefloat javascript 2 decimal

Arun Prasad E SArun Prasad E S

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I’ve got other solution.

You can use
round() to do that instead toFixed()

var twoPlacedFloat = parseFloat(yourString).round(2)

answered Aug 20, 2012 at 16:36

4

The solution that work for me is the following

parseFloat(value)

answered Sep 11, 2018 at 18:00

Hướng dẫn parsefloat javascript 2 decimal

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