Mẹo về Javascript format number to 2 decimal places Mới Nhất
Họ tên bố (mẹ) đang tìm kiếm từ khóa Javascript format number to 2 decimal places được Cập Nhật vào lúc : 2022-09-27 23:54:22 . Với phương châm chia sẻ Kinh Nghiệm Hướng dẫn trong nội dung bài viết một cách Chi Tiết Mới Nhất. Nếu sau khi đọc Post vẫn ko hiểu thì hoàn toàn có thể lại phản hồi ở cuối bài để Mình lý giải và hướng dẫn lại nha.I would like to format my numbers to always display 2 decimal places, rounding where applicable.
Nội dung chính- RegExp - alternative approachHow do I get 2 decimal places in JavaScript?How do you move a number to 2 decimal places?How do I limit decimal places in JavaScript?How do you write to 2 decimal places in Java?
Examples:
number display ------ ------- 1 1.00 1.341 1.34 1.345 1.35I have been using this:
parseFloat(num).toFixed(2);But it's displaying 1 as 1, rather than 1.00.
drudge
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asked May 26, 2011 5:22
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(Math.round(num * 100) / 100).toFixed(2);Live Demo
Note that it will round to 2 decimal places, so the input 1.346 will return 1.35.
Corey
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answered May 26, 2011 5:27
drudgedrudge
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Number(1).toFixed(2); // 1.00 Number(1.341).toFixed(2); // 1.34 Number(1.345).toFixed(2); // 1.34 NOTE: See andy's comment below. Number(1.3450001).toFixed(2); // 1.35
Florian
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answered Nov 8, 2012 16:06
Abel ANEIROSAbel ANEIROS
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This answer will fail if value = 1.005.
As a better solution, the rounding problem can be avoided by using numbers represented in exponential notation:
Number(Math.round(1.005+'e2')+'e-2'); // 1.01Cleaner code as suggested by @Kon, and the original author:
Number(Math.round(parseFloat(value + 'e' + decimalPlaces)) + 'e-' + decimalPlaces)You may add toFixed() the end to retain the decimal point e.g: 1.00 but note that it will return as string.
Number(Math.round(parseFloat(value + 'e' + decimalPlaces)) + 'e-' + decimalPlaces).toFixed(decimalPlaces)Credit: Rounding Decimals in JavaScript
answered Aug 24, 2015 9:30
razurazu
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For modern browsers, use toLocaleString:
var num = 1.345; num.toLocaleString(undefined, maximumFractionDigits: 2, minimumFractionDigits: 2 );Specify a locale tag as first parameter to control the decimal separator. For a dot, use for example English U.S. locale:
num.toLocaleString("en-US", maximumFractionDigits: 2, minimumFractionDigits: 2 );which gives:
1.35
Most countries in Europe use a comma as decimal separator, so if you for example use Swedish/Sweden locale:
num.toLocaleString("sv-SE", maximumFractionDigits: 2, minimumFractionDigits: 2 );it will give:
1,35
answered Nov 19, 2022 15:43
holmis83holmis83
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var num = new Number(14.12); console.log(num.toPrecision(2)); //outputs 14 console.log(num.toPrecision(3)); //outputs 14.1 console.log(num.toPrecision(4)); //outputs 14.12 console.log(num.toPrecision(5)); //outputs 14.120
mplungjan
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answered Sep 7, 2012 13:16
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I would suggest you use
new Intl.NumberFormat('de-DE', minimumFractionDigits: 2, maximumFractionDigits: 2 ).format(num)that way you will also have the local format of a country you specify, plus it would garantee to show exact 2 decimals (whether when num is 1 or 1.12345, it will show 1.00 and 1.12 respectively)
In this example I used German localization, because I wanted my numbers show with thousands delimiter, so this would be some outputs:
1 => 1,00 1.12 => 1,12 1.1234 => 1,12 1234 => 1.234,00 1234.1234 => 1.234,12answered Oct 20, 2022 13:42
ImbroImbro
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For the most accurate rounding, create this function and use it to round to 2 decimal places:
function round(value, decimals) return Number(Math.round(value + 'e' + decimals) + 'e-' + decimals).toFixed(decimals); console.log("seeked to " + round(1.005, 2));> 1.01Thanks to Razu, this article, and MDN's Math.round reference.
mplungjan
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answered Jan 14, 2022 18:24
NateNate
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Simplest answer:
var num = 1.2353453; num.toFixed(2); // 1.24Example: ://jsfiddle/E2XU7/
answered Apr 8, 2013 18:37
macio.Junmacio.Jun
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A much more generic solution for rounding to N places
function roundN(num,n) return parseFloat(Math.round(num * Math.pow(10, n)) /Math.pow(10,n)).toFixed(n); console.log(roundN(1,2)) console.log(roundN(1.34,2)) console.log(roundN(1.35,2)) console.log(roundN(1.344,2)) console.log(roundN(1.345,2)) console.log(roundN(1.344,3)) console.log(roundN(1.345,3)) console.log(roundN(1.3444,3)) console.log(roundN(1.3455,3)) Output 1.00 1.34 1.35 1.34 1.35 1.344 1.345 1.344 1.346answered Sep 6, 2022 12:31
PirateAppPirateApp
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You are not giving us the whole picture.
javascript:alert(parseFloat(1).toFixed(2)) shows 1.00 in my browsers when I paste it into the location bar. However if you do something to it afterwards, it will revert.
alert(parseFloat(1).toFixed(2)) var num = 2 document.getElementById('spanId').innerHTML = (parseFloat(num).toFixed(2) - 1)shows 1 and not 1.00answered May 26, 2011 5:39
mplungjanmplungjan
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If you're already using jQuery, you could look using the jQuery Number Format plugin.
The plugin can return formatted numbers as a string, you can set decimal, and thousands separators, and you can choose the number of decimals to show.
$.number( 123, 2 ); // Returns '123.00'You can also get jQuery Number Format from GitHub.
answered Nov 8, 2012 23:47
Sam SehnertSam Sehnert
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Is this what you mean?
[edit 20200530] The answer @razu provided is the best imho. So here's a slightly refactored version.
The snippet code will still not return the right value for something like showAsFloat(2.3346) (result 2.33, but should be 2.34). So, see also.
const showAsFloat = (input, decimals = 2, asString = false) => if (input === null ; document.querySelector('#result').textContent = [ 'command | result', '-----------------------------------------------', 'showAsFloat(1); | ' + showAsFloat(1), 'showAsFloat(1.314); | ' + showAsFloat(1.314), 'showAsFloat('notanumber') | ' + showAsFloat('notanumber'), 'showAsFloat('23.44567', 3) | ' + showAsFloat('23.44567', 3), 'showAsFloat(2456198, 5, true)| ' + showAsFloat('24568', 5, true), 'showAsFloat(2456198, 5) | ' + showAsFloat('24568', 5), 'showAsFloat(0, 2, true); | ' + showAsFloat(0, 2, true), 'showAsFloat(1.345); | ' + showAsFloat(1.345), 'showAsFloat(0.005); | ' + showAsFloat(0.005), 'showAsFloat(null); | ' + showAsFloat(null), ].join('n');answered May 26, 2011 6:17
KooiIncKooiInc
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Are you looking for floor?
var num = 1.42482; var num2 = 1; var fnum = Math.floor(num).toFixed(2); var fnum2 = Math.floor(num2).toFixed(2); console.log(fnum + " and " + fnum2); //both values will be 1.00
mplungjan
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answered May 26, 2011 5:26
samwisesamwise
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Convert a number into a string, keeping only two decimals:
var num = 5.56789; var n = num.toFixed(2);The result of n will be:
5.57answered Jun 21, 2022 5:58
Just run into this one of longest thread, below is my solution:
parseFloat(Math.round((parseFloat(num * 100)).toFixed(2)) / 100 ).toFixed(2)Let me know if anyone can poke a hole
dota2pro
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answered May 28, 2022 20:29
function currencyFormat (num)
return "$" + num.toFixed(2).replace(/(d)(?=(d3)+(?!d))/g, "$1,")
console.info(currencyFormat(2665)); // $2,665.00
console.info(currencyFormat(102665)); // $102,665.00
answered Aug 19, 2015 4:49
ArNoArNo
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Here's also a generic function that can format to any number of decimal places:
function numberFormat(val, decimalPlaces) var multiplier = Math.pow(10, decimalPlaces); return (Math.round(val * multiplier) / multiplier).toFixed(decimalPlaces);answered Sep 18, 2015 12:50
Minas MinaMinas Mina
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Where specific formatting is required, you should write your own routine or use a library function that does what you need. The basic ECMAScript functionality is usually insufficient for displaying formatted numbers.
A thorough explanation of rounding and formatting is here: ://www.merlyn.demon.co.uk/js-round.htm#RiJ
As a general rule, rounding and formatting should only be peformed as a last step before output. Doing so earlier may introduce unexpectedly large errors and destroy the formatting.
answered May 26, 2011 5:58
RobGRobG
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here is another solution to round only using floor, meaning, making sure calculated amount won't be bigger than the original amount (sometimes needed for transactions):
Math.floor(num* 100 )/100;
answered Dec 9, 2022 12:51
NatyNaty
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function number_format(string,decimals=2,decimal=",",thousands=".",pre="R$ ",pos=" Reais") var numbers = string.toString().match(/d+/g).join([]); numbers = numbers.padStart(decimals+1, "0"); var splitNumbers = numbers.split("").reverse(); var mask = ''; splitNumbers.forEach(function(d,i) if (i == decimals) mask = decimal + mask; if (i>(decimals+1) && ((i-2)%(decimals+1))==0) mask = thousands + mask; mask = d + mask; ); return pre + mask + pos; var element = document.getElementById("format"); var money= number_format("10987654321",2,',','.'); element.innerHTML = money;#format display:inline-block; padding:10px; border:1px solid #ddd; background:#f5f5f5;answered Oct 20, 2022 18:26
Try below code:
function numberWithCommas(number) var newval = parseFloat(Math.round(number * 100) / 100).toFixed(2); return newval.toString().replace(/B(?=(d3)+(?!d))/g, ",");
Nayana_Das
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answered Apr 30, 2022 8:45
Tsuna SawadaTsuna Sawada
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var quantity = 12; var import1 = 12.55; var total = quantity * import1; var answer = parseFloat(total).toFixed(2); document.write(answer);
answered Sep 18, 2014 11:46
I had to decide between the parseFloat() and Number() conversions before I could make toFixed() call. Here's an example of a number formatting post-capturing user input.
HTML:
Event handler:
$('.dec-number').on('change', function () const value = $(this).val(); $(this).val(value.toFixed(2)); );The above code will result in TypeError exception. Note that although the html input type is "number", the user input is actually a "string" data type. However, toFixed() function may only be invoked on an object that is a Number.
My final code would look as follows:
$('.dec-number').on('change', function () const value = Number($(this).val()); $(this).val(value.toFixed(2)); );The reason I favor to cast with Number() vs. parseFloat() is because I don't have to perform an extra validation neither for an empty input string, nor NaN value. The Number() function would automatically handle an empty string and covert it to zero.
answered Oct 12, 2022 19:18
vitekvitek
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var num1 = "0.1"; document.getElementById('num1').innerHTML = (Math.round(num1 * 100) / 100).toFixed(2); var num2 = "1.341"; document.getElementById('num2').innerHTML = (Math.round(num2 * 100) / 100).toFixed(2); var num3 = "1.345"; document.getElementById('num3').innerHTML = (Math.round(num3 * 100) / 100).toFixed(2);span border: 1px solid #000; margin: 5px; padding: 5px;
ksav
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answered Feb 5, 2022 10:09
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RegExp - alternative approach
On input you have string (because you use parse) so we can get result by using only string manipulations and integer number calculations
let toFix2 = (n) => n.replace(/(-?)(d+).(dd)(d+)/, (_,s,i,d,r)=> let k= (+r[0]>=5)+ +d - (r==5 && s=='-'); return s + (+i+(k>99)) + "." + ((k>99)?"00":(k>9?k:"0"+k)); ) // TESTs console.log(toFix2("1")); console.log(toFix2("1.341")); console.log(toFix2("1.345")); console.log(toFix2("1.005"));Explanation
- s is sign, i is integer
part, d are first two digits after dot, r are other digits (we use r[0] value to calc rounding)k contains information about last two digits (represented as integer number)if r[0] is >=5 then we add 1 to d - but in case when we have minus number (s=='-') and r is exact equal to 5 then in this case we substract 1 (for compatibility reasons - in same way Math.round works for minus numbers e.g Math.round(-1.5)==-1)after that if
last two digits k are greater than 99 then we add one to integer part i
answered Oct 16, 2022 9:06
Kamil KiełczewskiKamil Kiełczewski
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I do like:
var num = 12.749; parseFloat((Math.round(num * 100) / 100).toFixed(2)); // 123.75Round the number with 2 decimal points, then make sure to parse it with parseFloat() to return Number, not String unless you don't care if it is String or Number.
answered Oct 16, 2022 3:38
YL3YL3
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Extend Math object with precision method
Object.defineProperty(Math, 'precision', value: function (value,precision,type)'round'; return (Math[t](v*Math.pow(10,p))/Math.pow(10,p)).toFixed(p); ); console.log( Math.precision(3.1,3), // round 3 digits Math.precision(0.12345,2,'ceil'), // ceil 2 digits Math.precision(1.1) // integer part )answered Feb 1, 2022 7:37
bortunacbortunac
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You can use numeral.js.
numeral(1.341).format('0.00') // 1.34 numeral(1.345).format('0.00') // 1.35answered Oct 8, 2022 12:33
lefrostlefrost
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How do I get 2 decimal places in JavaScript?
To limit the number of digits up to 2 places after the decimal, the toFixed() method is used. The toFixed() method rounds up the floating-point number up to 2 places after the decimal.How do you move a number to 2 decimal places?
Rounding a decimal number to two decimal places is the same as rounding it to the hundredths place, which is the second place to the right of the decimal point. For example, 2.83620364 can be round to two decimal places as 2.84, and 0.7035 can be round to two decimal places as 0.70.How do I limit decimal places in JavaScript?
To limit decimal places in JavaScript, use the toFixed() method by specifying the number of decimal places.. Rounds the number.. Converts it into a string.. Returns the number as a string..How do you write to 2 decimal places in Java?
Just use %. 2f as the format specifier. This will make the Java printf format a double to two decimal places. Tải thêm tài liệu liên quan đến nội dung bài viết Javascript format number to 2 decimal places programming javascript Format number JavaScript toFixed js toLocaleString format number Round number JavaScript Jquery float value Float js round