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));
``````

asked Dec 14, 2010 at 1:41

user357034user357034

You can use
toFixed() to do that

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

bob esponja

answered Dec 14, 2010 at 1:44

Mahesh VelagaMahesh Velaga

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

answered Aug 6, 2013 at 21:04

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

3

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

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

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

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

NimeshNimesh

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

13:09

``````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.

MattMatt

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

@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.

answered Jul 3, 2019 at 7:17

1

You can store your price as a string

You can use Number(string)

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

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);
}
``````

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

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

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

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