How to convert string into float in JavaScript?

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I am trying to parse two values from a datagrid. The fields are numeric, and when they have a comma (ex. 554,20), I can't get the numbers after the comma. I've tried parseInt and parseFloat. How can I do this?

If they're meant to be separate values, try this:

var values = "554,20".split(",")
var v1 = parseFloat(values[0])
var v2 = parseFloat(values[1])

If they're meant to be a single value (like in French, where one-half is written 0,5)

var value = parseFloat("554,20".replace(",", "."));

How to convert string into float in JavaScript?, Method 1: In this method we will use the Type Conversion feature of JavaScript which will convert the string value into float. Example: Below� If you extend String object like this.. String.prototype.float = function() { return parseFloat(this.replace(',', '.')); } .. you can run it like this "554,20".float() > 554.20 works with dot as well "554.20".float() > 554.20 typeof "554,20".float() > "number"

Have you ever tried to do this? :p

var str = '3.8';ie
alert( +(str) + 0.2 );

+(string) will cast string into float.

Handy!

So in order to solve your problem, you can do something like this:

var floatValue = +(str.replace(/,/,'.'));

How to convert string into float in JavaScript?, The parseFloat() function is used to accept the string and convert it into a floating- point number. If the string does not contain a numeral value or� Javascript has provided a method called parseFloat () to convert a string into a floating poin t number. Floating numbers are nothing but decimals. We also have another method called parseInt () to do the same task but it will not deal with decimals. It returns only integers.

Replace the comma with a dot.

This will only return 554:

var value = parseFloat("554,20")

This will return 554.20:

var value = parseFloat("554.20")

So in the end, you can simply use:

var fValue = parseFloat(document.getElementById("textfield").value.replace(",","."))

Don't forget that parseInt() should only be used to parse integers (no floating points). In your case it will only return 554. Additionally, calling parseInt() on a float will not round the number: it will take its floor (closest lower integer).


Extended example to answer Pedro Ferreira's question from the comments:

If the textfield contains thousands separator dots like in 1.234.567,99 those could be eliminated beforehand with another replace:

var fValue = parseFloat(document.getElementById("textfield").value.replace(/\./g,"").replace(",","."))

JavaScript parseFloat() Function, parses an argument (converting it to a string first if needed) and returns a floating point number. JavaScript Demo: Standard built-in objects - parseFloat() Leading and trailing spaces in the argument are ignored. We use the parseFloat method which is an embedded function in JavaScript to accept the string and transform it into a floating dot number. If there is no numeric value in the string, or if the first string character is not a number, then the string returns NaN value, i.e. not a number.

If you extend String object like this..

String.prototype.float = function() { 
  return parseFloat(this.replace(',', '.')); 
}

.. you can run it like this

"554,20".float()
> 554.20

works with dot as well

"554.20".float()
> 554.20

typeof "554,20".float()
> "number"

parseFloat(), In the case you need to parse a string with decimal separators, use Intl. NumberFormat Duration: 1:56 Posted: May 14, 2018 The parseFloat () function parses a string and returns a floating point number. This function determines if the first character in the specified string is a number. If it is, it parses the string until it reaches the end of the number, and returns the number as a number, not as a string. Note: Only the first number in the string is returned!

@GusDeCool or anyone else trying to replace more than one thousands separators, one way to do it is a regex global replace: /foo/g. Just remember that . is a metacharacter, so you have to escape it or put it in brackets (\. or [.]). Here's one option:

var str = '6.000.000';
str.replace(/[.]/g,",");

How to convert a string to a number in JavaScript, Math.ceil() can be used to round an integer or floating point number. Unary Operator By adding a + sign before a String, it will be converted into a number if it � How could I convert from float to string or string to float? In my case I need to make the assertion between 2 values string (value that I have got from table) and float value that I have calculated. String valueFromTable = "25"; Float valueCalculated =25.0; I tried from float to string: String sSelectivityRate = String.valueOf(valueCalculated );

JavaScript Convert String to Number, Javascript has provided a method called parseFloat() to convert a string into a floating point number. Floating numbers are nothing but� First, it is just a presentation of the float number you see in the debugger. The real value is approximately exact (as much as it's possible). Note: Use always CultureInfo information when dealing with floating point numbers versus strings. float.Parse("41.00027357629127", System.Globalization.CultureInfo.InvariantCulture);

How to convert a string to a floating point number in JavaScript?, 1. How to Convert a String into Point Number�. Use parseFloat() function, which purses a string and returns a floating point number. The argument of parseFloat� There are various methods to convert float number to the whole number in JavaScript. Math.floor (floating argument): Round off the number passed as parameter to its nearest integer in Downward direction .

How to Convert String to Number in JavaScript, Here we discuss how to convert string to float in JS using various methods Let assume if the data we have in float and we want to convert in the string or we� To convert a string to an integer parseInt() function is used in javascript.parseInt() function returns Nan( not a number) when the string doesn’t contain number.If a string with a number is sent then only that number will be returned as the output.

Comments
  • see also: stackoverflow.com/questions/24318654
  • What about where you have a comma used as a thousand seperator? E.g. 1234 written as 1,234
  • You could just remove the comma, then parse it. (eg. replace it with "")
  • it's not very safe, as sconto = parseFloat("5,,5".replace(",", ".")); returns 5 leading one to believe it's a valid number, but you loose the .5 part or you could consider it is not a valid number
  • @max4ever If you're worried about silently accepting invalid numbers, you can use +(string) instead of parseString(string) as suggested by @Stev below. So, the first example would be v1 = +(values[0]); v2 = +(values[1]);.
  • FAIL, what if my number is 6.000.000. Function replace only replace first comma separator
  • I really like the +(str) solution - parseFloat ignores invalid characters after the number, +(str) returns NaN in those cases, which is exactly what I need.
  • What about the "." thousands separator? Like 4.554,20 what would return...?
  • Although usually it's considered bad form to modify the base object prototypes. What if another framework also tried to do that but the functionality differed?
  • yea, a replace without a regex only replaces one occurrence of the character.