Reputation: 32402
How to format numbers as currency strings
I would like to format a price in JavaScript. I'd like a function which takes a float as an argument and returns a string formatted like this:
"$ 2,500.00"
How can I do this?
Upvotes: 2519
Views: 2931789
Answers (30)
Reputation: 17647
Here are some solutions and all pass the test suite. The test suite and benchmark are included. If you want copy and paste to test, try this gist.
Method 0 (RegExp)
It is based on VisioN's answer, but it fixes if there isn't a decimal point.
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision = 2) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.');
a[0] = a[0].replace(/\d(?=(\d{3})+$)/g, '$&,');
return a.join('.');
}
}
console.log((-123456789.0134).format());Method 1
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision = 2) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.'),
// Skip the '-' sign
head = Number(this < 0);
// Skip the digits that's before the first thousands separator
head += (a[0].length - head) % 3 || 3;
a[0] = a[0].slice(0, head) + a[0].slice(head).replace(/\d{3}/g, ',$&');
return a.join('.');
};
}
console.log((-123456789.0134).format());Method 2 (Split to Array)
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
const a = this.toFixed(precision).split('.');
a[0] = a[0]
.split('').reverse().join('')
.replace(/\d{3}(?=\d)/g, '$&,')
.split('').reverse().join('');
return a.join('.');
};
}
Method 3 (Loop)
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('');
a.push('.');
var i = a.indexOf('.') - 3;
while (i > 0 && a[i-1] !== '-') {
a.splice(i, 0, ',');
i -= 3;
}
a.pop();
return a.join('');
};
}
Usage Example
console.log('======== Demo ========')
console.log(
(1234567).format(0),
(1234.56).format(2),
(-1234.56).format(0)
);
var n = 0;
for (var i=1; i<20; i++) {
n = (n * 10) + (i % 10)/100;
console.log(n.format(2), (-n).format(2));
}
Separator
If we want custom a thousands separator or decimal separator, use replace():
123456.78.format(2).replace(',', ' ').replace('.', ' ');
Test suite
function assertEqual(a, b) {
if (a !== b) {
throw a + ' !== ' + b;
}
}
function test(format_function) {
console.log(format_function);
assertEqual('NaN', format_function.call(NaN, 0))
assertEqual('Infinity', format_function.call(Infinity, 0))
assertEqual('-Infinity', format_function.call(-Infinity, 0))
assertEqual('0', format_function.call(0, 0))
assertEqual('0.00', format_function.call(0, 2))
assertEqual('1', format_function.call(1, 0))
assertEqual('-1', format_function.call(-1, 0))
// Decimal padding
assertEqual('1.00', format_function.call(1, 2))
assertEqual('-1.00', format_function.call(-1, 2))
// Decimal rounding
assertEqual('0.12', format_function.call(0.123456, 2))
assertEqual('0.1235', format_function.call(0.123456, 4))
assertEqual('-0.12', format_function.call(-0.123456, 2))
assertEqual('-0.1235', format_function.call(-0.123456, 4))
// Thousands separator
assertEqual('1,234', format_function.call(1234.123456, 0))
assertEqual('12,345', format_function.call(12345.123456, 0))
assertEqual('123,456', format_function.call(123456.123456, 0))
assertEqual('1,234,567', format_function.call(1234567.123456, 0))
assertEqual('12,345,678', format_function.call(12345678.123456, 0))
assertEqual('123,456,789', format_function.call(123456789.123456, 0))
assertEqual('-1,234', format_function.call(-1234.123456, 0))
assertEqual('-12,345', format_function.call(-12345.123456, 0))
assertEqual('-123,456', format_function.call(-123456.123456, 0))
assertEqual('-1,234,567', format_function.call(-1234567.123456, 0))
assertEqual('-12,345,678', format_function.call(-12345678.123456, 0))
assertEqual('-123,456,789', format_function.call(-123456789.123456, 0))
// Thousands separator and decimal
assertEqual('1,234.12', format_function.call(1234.123456, 2))
assertEqual('12,345.12', format_function.call(12345.123456, 2))
assertEqual('123,456.12', format_function.call(123456.123456, 2))
assertEqual('1,234,567.12', format_function.call(1234567.123456, 2))
assertEqual('12,345,678.12', format_function.call(12345678.123456, 2))
assertEqual('123,456,789.12', format_function.call(123456789.123456, 2))
assertEqual('-1,234.12', format_function.call(-1234.123456, 2))
assertEqual('-12,345.12', format_function.call(-12345.123456, 2))
assertEqual('-123,456.12', format_function.call(-123456.123456, 2))
assertEqual('-1,234,567.12', format_function.call(-1234567.123456, 2))
assertEqual('-12,345,678.12', format_function.call(-12345678.123456, 2))
assertEqual('-123,456,789.12', format_function.call(-123456789.123456, 2))
}
console.log('======== Testing ========');
test(Number.prototype.format);
test(Number.prototype.format1);
test(Number.prototype.format2);
test(Number.prototype.format3);
Benchmark
function benchmark(f) {
var start = new Date().getTime();
f();
return new Date().getTime() - start;
}
function benchmark_format(f) {
console.log(f);
time = benchmark(function () {
for (var i = 0; i < 100000; i++) {
f.call(123456789, 0);
f.call(123456789, 2);
}
});
console.log(time.format(0) + 'ms');
}
// If not using async, the browser will stop responding while running.
// This will create a new thread to benchmark
async = [];
function next() {
setTimeout(function () {
f = async.shift();
f && f();
next();
}, 10);
}
console.log('======== Benchmark ========');
async.push(function () { benchmark_format(Number.prototype.format); });
next();
Upvotes: 11
Reputation: 3606
Intl.NumberFormat
JavaScript has a number formatter (part of the Internationalization API).
// Create our number formatter.
const formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
// These options can be used to round to whole numbers.
trailingZeroDisplay: 'stripIfInteger' // This is probably what most people
// want. It will only stop printing
// the fraction when the input
// amount is a round number (int)
// already. If that's not what you
// need, have a look at the options
// below.
//minimumFractionDigits: 0, // This suffices for whole numbers, but will
// print 2500.10 as $2,500.1
//maximumFractionDigits: 0, // Causes 2500.99 to be printed as $2,501
});
// Use the formatter with the value of an input.
let input = document.getElementById('amount');
input.addEventListener('keyup', e => {
document.getElementById('result').innerText = formatter.format(e.target.value);
});
input.dispatchEvent(new Event('keyup'));<label>
Amount
<input id="amount" value="2500">
</label>
Result:
<span id="result"></span>Use undefined in place of the first argument ('en-US' in the example) to use the system locale (the user locale in case the code is running in a browser). Further explanation of the locale code.
Here's a list of the currency codes.
Intl.NumberFormat vs Number.prototype.toLocaleString
A final note comparing this to the older .toLocaleString. They both offer essentially the same functionality. However, toLocaleString in its older incarnations (pre-Intl) does not actually support locales: it uses the system locale. So when debugging old browsers, be sure that you're using the correct version (MDN suggests to check for the existence of Intl). There isn't any need to worry about this at all if you don't care about old browsers or just use the shim.
Also, the performance of both is the same for a single item, but if you have a lot of numbers to format, using Intl.NumberFormat is ~70 times faster. Therefore, it's usually best to use Intl.NumberFormat and instantiate only once per page load. Anyway, here's the equivalent usage of toLocaleString:
console.log((2500).toLocaleString('en-US', {
style: 'currency',
currency: 'USD',
})); /* $2,500.00 */Some notes on browser support and Node.js
- Browser support is no longer an issue nowadays with 99+% support globally
- There is a shim to support it on fossilized browsers (like Internet Explorer 8), should you really need to
- Node.js before v13 only supports
en-USout of the box. One solution is to install full-icu, see here for more information - Have a look at CanIUse for more information
Upvotes: 2839
Reputation: 140973
Number.prototype.toFixed
This solution is compatible with every single major browser:
const profits = 2489.8237;
profits.toFixed(3) // Returns 2489.824 (rounds up)
profits.toFixed(2) // Returns 2489.82
profits.toFixed(7) // Returns 2489.8237000 (pads the decimals)
All you need is to add the currency symbol (e.g. "$" + profits.toFixed(2)) and you will have your amount in dollars.
Custom function
If you require the use of , between each digit, you can use this function:
function formatMoney(number, decPlaces, decSep, thouSep) {
decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
decSep = typeof decSep === "undefined" ? "." : decSep;
thouSep = typeof thouSep === "undefined" ? "," : thouSep;
var sign = number < 0 ? "-" : "";
var i = String(parseInt(number = Math.abs(Number(number) || 0).toFixed(decPlaces)));
var j = (j = i.length) > 3 ? j % 3 : 0;
return sign +
(j ? i.substr(0, j) + thouSep : "") +
i.substr(j).replace(/(\decSep{3})(?=\decSep)/g, "$1" + thouSep) +
(decPlaces ? decSep + Math.abs(number - i).toFixed(decPlaces).slice(2) : "");
}
document.getElementById("b").addEventListener("click", event => {
document.getElementById("x").innerText = "Result was: " + formatMoney(document.getElementById("d").value);
});<label>Insert your amount: <input id="d" type="text" placeholder="Cash amount" /></label>
<br />
<button id="b">Get Output</button>
<p id="x">(press button to get output)</p>Use it like so:
(123456789.12345).formatMoney(2, ".", ",");
If you're always going to use '.' and ',', you can leave them off your method call, and the method will default them for you.
(123456789.12345).formatMoney(2);
If your culture has the two symbols flipped (i.e., Europeans) and you would like to use the defaults, just paste over the following two lines in the formatMoney method:
d = d == undefined ? "," : d,
t = t == undefined ? "." : t,
Custom function (ES6)
If you can use modern ECMAScript syntax (i.e., through Babel), you can use this simpler function instead:
function formatMoney(amount, decimalCount = 2, decimal = ".", thousands = ",") {
try {
decimalCount = Math.abs(decimalCount);
decimalCount = isNaN(decimalCount) ? 2 : decimalCount;
const negativeSign = amount < 0 ? "-" : "";
let i = parseInt(amount = Math.abs(Number(amount) || 0).toFixed(decimalCount)).toString();
let j = (i.length > 3) ? i.length % 3 : 0;
return negativeSign +
(j ? i.substr(0, j) + thousands : '') +
i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousands) +
(decimalCount ? decimal + Math.abs(amount - i).toFixed(decimalCount).slice(2) : "");
} catch (e) {
console.log(e)
}
};
document.getElementById("b").addEventListener("click", event => {
document.getElementById("x").innerText = "Result was: " + formatMoney(document.getElementById("d").value);
});<label>Insert your amount: <input id="d" type="text" placeholder="Cash amount" /></label>
<br />
<button id="b">Get Output</button>
<p id="x">(press button to get output)</p>Upvotes: 1971
Reputation: 36
just use the native javascript Intl
you just use the options to format its value
const number = 1233445.5678
console.log(new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' }).format(number));Upvotes: 42
Reputation: 1311
Please try the below code
"250000".replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,');
Ans: 250,000
Upvotes: 31
Reputation: 27382
Take a look at the JavaScript Number object and see if it can help you.
toLocaleString()will format a number using location specific thousands separator.toFixed()will round the number to a specific number of decimal places.
To use these at the same time the value must have its type changed back to a number because they both output a string.
Example:
Number((someNumber).toFixed(1)).toLocaleString()
EDIT
One can just use toLocaleString directly and its not necessary to recast to a number:
someNumber.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
Multiple numbers
If you need to frequently format numbers similarly you can create a specific object for reuse. Like for German (Switzerland):
const money = new Intl.NumberFormat('de-CH',
{ style:'currency', currency: 'CHF' });
const percent = new Intl.NumberFormat('de-CH',
{ style:'percent', maximumFractionDigits: 1, signDisplay: "always"});
which than can be used as:
money.format(1234.50); // output CHF 1'234.50
percent.format(0.083); // output +8.3%
Pretty nifty.
Upvotes: 358
Reputation: 60424
Here's another attempt, just for fun:
function formatDollar(num) {
var p = num.toFixed(2).split(".");
return "$" + p[0].split("").reverse().reduce(function(acc, num, i, orig) {
return num + (num != "-" && i && !(i % 3) ? "," : "") + acc;
}, "") + "." + p[1];
}
And some tests:
formatDollar(45664544.23423) // "$45,664,544.23"
formatDollar(45) // "$45.00"
formatDollar(123) // "$123.00"
formatDollar(7824) // "$7,824.00"
formatDollar(1) // "$1.00"
formatDollar(-1345) // "$-1,345.00
formatDollar(-3) // "$-3.00"
Upvotes: 89
Reputation: 609
Please find in the below code what I have developed to support internationalization.
It formats the given numeric value to language specific format. In the given example I have used ‘en’ while have tested for ‘es’, ‘fr’ and other countries where in the format varies. It not only stops the user from keying characters, but it formats the value on tab out.
I have created components for Number as well as for Decimal format. Apart from this, I have created parseNumber(value, locale) and parseDecimal(value, locale) functions which will parse the formatted data for any other business purposes. The said function will accept the formatted data and will return the non-formatted value. I have used the jQuery validator plugin in the below shared code.
HTML:
<tr>
<td>
<label class="control-label">
Number Field:
</label>
<div class="inner-addon right-addon">
<input type="text" id="numberField"
name="numberField"
class="form-control"
autocomplete="off"
maxlength="17"
data-rule-required="true"
data-msg-required="Cannot be blank."
data-msg-maxlength="Exceeding the maximum limit of 13 digits. Example: 1234567890123"
data-rule-numberExceedsMaxLimit="en"
data-msg-numberExceedsMaxLimit="Exceeding the maximum limit of 13 digits. Example: 1234567890123"
onkeydown="return isNumber(event, 'en')"
onkeyup="return updateField(this)"
onblur="numberFormatter(this,
'en',
'Invalid character(s) found. Please enter valid characters.')">
</div>
</td>
</tr>
<tr>
<td>
<label class="control-label">
Decimal Field:
</label>
<div class="inner-addon right-addon">
<input type="text" id="decimalField"
name="decimalField"
class="form-control"
autocomplete="off"
maxlength="20"
data-rule-required="true"
data-msg-required="Cannot be blank."
data-msg-maxlength="Exceeding the maximum limit of 16 digits. Example: 1234567890123.00"
data-rule-decimalExceedsMaxLimit="en"
data-msg-decimalExceedsMaxLimit="Exceeding the maximum limit of 16 digits. Example: 1234567890123.00"
onkeydown="return isDecimal(event, 'en')"
onkeyup="return updateField(this)"
onblur="decimalFormatter(this,
'en',
'Invalid character(s) found. Please enter valid characters.')">
</div>
</td>
</tr>
JavaScript:
/*
* @author: dinesh.lomte
*/
/* Holds the maximum limit of digits to be entered in number field. */
var numericMaxLimit = 13;
/* Holds the maximum limit of digits to be entered in decimal field. */
var decimalMaxLimit = 16;
/**
*
* @param {type} value
* @param {type} locale
* @returns {Boolean}
*/
parseDecimal = function(value, locale) {
value = value.trim();
if (isNull(value)) {
return 0.00;
}
if (isNull(locale)) {
return value;
}
if (getNumberFormat(locale)[0] === '.') {
value = value.replace(/\./g, '');
} else {
value = value.replace(
new RegExp(getNumberFormat(locale)[0], 'g'), '');
}
if (getNumberFormat(locale)[1] === ',') {
value = value.replace(
new RegExp(getNumberFormat(locale)[1], 'g'), '.');
}
return value;
};
/**
*
* @param {type} element
* @param {type} locale
* @param {type} nanMessage
* @returns {Boolean}
*/
decimalFormatter = function (element, locale, nanMessage) {
showErrorMessage(element.id, false, null);
if (isNull(element.id) || isNull(element.value) || isNull(locale)) {
return true;
}
var value = element.value.trim();
value = value.replace(/\s/g, '');
value = parseDecimal(value, locale);
var numberFormatObj = new Intl.NumberFormat(locale,
{ minimumFractionDigits: 2,
maximumFractionDigits: 2
}
);
if (numberFormatObj.format(value) === 'NaN') {
showErrorMessage(element.id, true, nanMessage);
setFocus(element.id);
return false;
}
element.value = numberFormatObj.format(value);
return true;
};
/**
*
* @param {type} element
* @param {type} locale
* @param {type} nanMessage
* @returns {Boolean}
*/
numberFormatter = function (element, locale, nanMessage) {
showErrorMessage(element.id, false, null);
if (isNull(element.id) || isNull(element.value) || isNull(locale)) {
return true;
}
var value = element.value.trim();
var format = getNumberFormat(locale);
if (hasDecimal(value, format[1])) {
showErrorMessage(element.id, true, nanMessage);
setFocus(element.id);
return false;
}
value = value.replace(/\s/g, '');
value = parseNumber(value, locale);
var numberFormatObj = new Intl.NumberFormat(locale,
{ minimumFractionDigits: 0,
maximumFractionDigits: 0
}
);
if (numberFormatObj.format(value) === 'NaN') {
showErrorMessage(element.id, true, nanMessage);
setFocus(element.id);
return false;
}
element.value =
numberFormatObj.format(value);
return true;
};
/**
*
* @param {type} id
* @param {type} flag
* @param {type} message
* @returns {undefined}
*/
showErrorMessage = function(id, flag, message) {
if (flag) {
// only add if not added
if ($('#'+id).parent().next('.app-error-message').length === 0) {
var errorTag = '<div class=\'app-error-message\'>' + message + '</div>';
$('#'+id).parent().after(errorTag);
}
} else {
// remove it
$('#'+id).parent().next(".app-error-message").remove();
}
};
/**
*
* @param {type} id
* @returns
*/
setFocus = function(id) {
id = id.trim();
if (isNull(id)) {
return;
}
setTimeout(function() {
document.getElementById(id).focus();
}, 10);
};
/**
*
* @param {type} value
* @param {type} locale
* @returns {Array}
*/
parseNumber = function(value, locale) {
value = value.trim();
if (isNull(value)) {
return 0;
}
if (isNull(locale)) {
return value;
}
if (getNumberFormat(locale)[0] === '.') {
return value.replace(/\./g, '');
}
return value.replace(
new RegExp(getNumberFormat(locale)[0], 'g'), '');
};
/**
*
* @param {type} locale
* @returns {Array}
*/
getNumberFormat = function(locale) {
var format = [];
var numberFormatObj = new Intl.NumberFormat(locale,
{ minimumFractionDigits: 2,
maximumFractionDigits: 2
}
);
var value = numberFormatObj.format('132617.07');
format[0] = value.charAt(3);
format[1] = value.charAt(7);
return format;
};
/**
*
* @param {type} value
* @param {type} fractionFormat
* @returns {Boolean}
*/
hasDecimal = function(value, fractionFormat) {
value = value.trim();
if (isNull(value) || isNull(fractionFormat)) {
return false;
}
if (value.indexOf(fractionFormat) >= 1) {
return true;
}
};
/**
*
* @param {type} event
* @param {type} locale
* @returns {Boolean}
*/
isNumber = function(event, locale) {
var keyCode = event.which ? event.which : event.keyCode;
// Validating if user has pressed shift character
if (keyCode === 16) {
return false;
}
if (isNumberKey(keyCode)) {
return true;
}
var numberFormatter = [32, 110, 188, 190];
if (keyCode === 32
&& isNull(getNumberFormat(locale)[0]) === isNull(getFormat(keyCode))) {
return true;
}
if (numberFormatter.indexOf(keyCode) >= 0
&& getNumberFormat(locale)[0] === getFormat(keyCode)) {
return true;
}
return false;
};
/**
*
* @param {type} event
* @param {type} locale
* @returns {Boolean}
*/
isDecimal = function(event, locale) {
var keyCode = event.which ? event.which : event.keyCode;
// Validating if user has pressed shift character
if (keyCode === 16) {
return false;
}
if (isNumberKey(keyCode)) {
return true;
}
var numberFormatter = [32, 110, 188, 190];
if (keyCode === 32
&& isNull(getNumberFormat(locale)[0]) === isNull(getFormat(keyCode))) {
return true;
}
if (numberFormatter.indexOf(keyCode) >= 0
&& (getNumberFormat(locale)[0] === getFormat(keyCode)
|| getNumberFormat(locale)[1] === getFormat(keyCode))) {
return true;
}
return false;
};
/**
*
* @param {type} keyCode
* @returns {Boolean}
*/
isNumberKey = function(keyCode) {
if ((keyCode >= 48 && keyCode <= 57) ||
(keyCode >= 96 && keyCode <= 105)) {
return true;
}
var keys = [8, 9, 13, 35, 36, 37, 39, 45, 46, 109, 144, 173, 189];
if (keys.indexOf(keyCode) !== -1) {
return true;
}
return false;
};
/**
*
* @param {type} keyCode
* @returns {JSON@call;parse.numberFormatter.value|String}
*/
getFormat = function(keyCode) {
var jsonString = '{"numberFormatter" : [{"key":"32", "value":" ", "description":"space"}, {"key":"188", "value":",", "description":"comma"}, {"key":"190", "value":".", "description":"dot"}, {"key":"110", "value":".", "description":"dot"}]}';
var jsonObject = JSON.parse(jsonString);
for (var key in jsonObject.numberFormatter) {
if (jsonObject.numberFormatter.hasOwnProperty(key)
&& keyCode === parseInt(jsonObject.numberFormatter[key].key)) {
return jsonObject.numberFormatter[key].value;
}
}
return '';
};
/**
*
* @type String
*/
var jsonString = '{"shiftCharacterNumberMap" : [{"char":")", "number":"0"}, {"char":"!", "number":"1"}, {"char":"@", "number":"2"}, {"char":"#", "number":"3"}, {"char":"$", "number":"4"}, {"char":"%", "number":"5"}, {"char":"^", "number":"6"}, {"char":"&", "number":"7"}, {"char":"*", "number":"8"}, {"char":"(", "number":"9"}]}';
/**
*
* @param {type} value
* @returns {JSON@call;parse.shiftCharacterNumberMap.number|String}
*/
getShiftCharSpecificNumber = function(value) {
var jsonObject = JSON.parse(jsonString);
for (var key in jsonObject.shiftCharacterNumberMap) {
if (jsonObject.shiftCharacterNumberMap.hasOwnProperty(key)
&& value === jsonObject.shiftCharacterNumberMap[key].char) {
return jsonObject.shiftCharacterNumberMap[key].number;
}
}
return '';
};
/**
*
* @param {type} value
* @returns {Boolean}
*/
isShiftSpecificChar = function(value) {
var jsonObject = JSON.parse(jsonString);
for (var key in jsonObject.shiftCharacterNumberMap) {
if (jsonObject.shiftCharacterNumberMap.hasOwnProperty(key)
&& value === jsonObject.shiftCharacterNumberMap[key].char) {
return true;
}
}
return false;
};
/**
*
* @param {type} element
* @returns {undefined}
*/
updateField = function(element) {
var value = element.value;
for (var index = 0; index < value.length; index++) {
if (!isShiftSpecificChar(value.charAt(index))) {
continue;
}
element.value = value.replace(
value.charAt(index),
getShiftCharSpecificNumber(value.charAt(index)));
}
};
/**
*
* @param {type} value
* @param {type} element
* @param {type} params
*/
jQuery.validator.addMethod('numberExceedsMaxLimit', function(value, element, params) {
value = parseInt(parseNumber(value, params));
if (value.toString().length > numericMaxLimit) {
showErrorMessage(element.id, false, null);
setFocus(element.id);
return false;
}
return true;
}, 'Exceeding the maximum limit of 13 digits. Example: 1234567890123.');
/**
*
* @param {type} value
* @param {type} element
* @param {type} params
*/
jQuery.validator.addMethod('decimalExceedsMaxLimit', function(value, element, params) {
value = parseFloat(parseDecimal(value, params)).toFixed(2);
if (value.toString().substring(
0, value.toString().lastIndexOf('.')).length > numericMaxLimit
|| value.toString().length > decimalMaxLimit) {
showErrorMessage(element.id, false, null);
setFocus(element.id);
return false;
}
return true;
}, 'Exceeding the maximum limit of 16 digits. Example: 1234567890123.00.');
/**
* @param {type} id
* @param {type} locale
* @returns {boolean}
*/
isNumberExceedMaxLimit = function(id, locale) {
var value = parseInt(parseNumber(
document.getElementById(id).value, locale));
if (value.toString().length > numericMaxLimit) {
setFocus(id);
return true;
}
return false;
};
/**
* @param {type} id
* @param {type} locale
* @returns {boolean}
*/
isDecimalExceedsMaxLimit = function(id, locale) {
var value = parseFloat(parseDecimal(
document.getElementById(id).value, locale)).toFixed(2);
if (value.toString().substring(
0, value.toString().lastIndexOf('.')).length > numericMaxLimit
|| value.toString().length > decimalMaxLimit) {
setFocus(id);
return true;
}
return false;
};
Upvotes: 1
Reputation: 147216
Because every problem deserves a one-line solution:
Number.prototype.formatCurrency = function() { return this.toFixed(2).toString().split(/[-.]/).reverse().reduceRight(function (t, c, i) { return (i == 2) ? '-' + t : (i == 1) ? t + c.replace(/(\d)(?=(\d{3})+$)/g, '$1,') : t + '.' + c; }, '$'); }
This is easy enough to change for different locales. Just change the '$1,' to '$1.' and '.' to ',' to swap , and . in numbers. The currency symbol can be changed by changing the '$' at the end.
Or, if you have ES6, you can just declare the function with default values:
Number.prototype.formatCurrency = function(thou = ',', dec = '.', sym = '$') { return this.toFixed(2).toString().split(/[-.]/).reverse().reduceRight(function (t, c, i) { return (i == 2) ? '-' + t : (i == 1) ? t + c.replace(/(\d)(?=(\d{3})+$)/g, '$1' + thou) : t + dec + c; }, sym); }
console.log((4215.57).formatCurrency())
$4,215.57
console.log((4216635.57).formatCurrency('.', ','))
$4.216.635,57
console.log((4216635.57).formatCurrency('.', ',', "\u20AC"))
€4.216.635,57
Oh and it works for negative numbers too:
console.log((-6635.574).formatCurrency('.', ',', "\u20AC"))
-€6.635,57
console.log((-1066.507).formatCurrency())
-$1,066.51
And of course you don't have to have a currency symbol:
console.log((1234.586).formatCurrency(',','.',''))
1,234.59
console.log((-7890123.456).formatCurrency(',','.',''))
-7,890,123.46
console.log((1237890.456).formatCurrency('.',',',''))
1.237.890,46
Upvotes: 3
Reputation: 2304
Here's a straightforward formatter in vanilla JavaScript:
function numberFormatter (num) {
console.log(num)
var wholeAndDecimal = String(num.toFixed(2)).split(".");
console.log(wholeAndDecimal)
var reversedWholeNumber = Array.from(wholeAndDecimal[0]).reverse();
var formattedOutput = [];
reversedWholeNumber.forEach( (digit, index) => {
formattedOutput.push(digit);
if ((index + 1) % 3 === 0 && index < reversedWholeNumber.length - 1) {
formattedOutput.push(",");
}
})
formattedOutput = formattedOutput.reverse().join('') + "." + wholeAndDecimal[1];
return formattedOutput;
}
Upvotes: 2
Reputation: 971
I had a hard time finding a simple library to work with date and currency, so I created my own: https://github.com/dericeira/slimFormatter.js
Simple as that:
var number = slimFormatter.currency(2000.54);
Upvotes: 3
Reputation: 6282
The following is concise, easy to understand, and doesn't rely on any overly complicated regular expressions.
function moneyFormat(price, sign = '$') {
const pieces = parseFloat(price).toFixed(2).split('')
let ii = pieces.length - 3
while ((ii-=3) > 0) {
pieces.splice(ii, 0, ',')
}
return sign + pieces.join('')
}
console.log(
moneyFormat(100),
moneyFormat(1000),
moneyFormat(10000.00),
moneyFormat(1000000000000000000)
)Here is a version with more options in the final output to allow formatting different currencies in different locality formats.
// higher order function that takes options then a price and will return the formatted price
const makeMoneyFormatter = ({
sign = '$',
delimiter = ',',
decimal = '.',
append = false,
precision = 2,
round = true,
custom
} = {}) => value => {
const e = [1, 10, 100, 1000, 10000, 100000, 1000000, 10000000]
value = round
? (Math.round(value * e[precision]) / e[precision])
: parseFloat(value)
const pieces = value
.toFixed(precision)
.replace('.', decimal)
.split('')
let ii = pieces.length - (precision ? precision + 1 : 0)
while ((ii-=3) > 0) {
pieces.splice(ii, 0, delimiter)
}
if (typeof custom === 'function') {
return custom({
sign,
float: value,
value: pieces.join('')
})
}
return append
? pieces.join('') + sign
: sign + pieces.join('')
}
// create currency converters with the correct formatting options
const formatDollar = makeMoneyFormatter()
const formatPound = makeMoneyFormatter({
sign: '£',
precision: 0
})
const formatEuro = makeMoneyFormatter({
sign: '€',
delimiter: '.',
decimal: ',',
append: true
})
const customFormat = makeMoneyFormatter({
round: false,
custom: ({ value, float, sign }) => `SALE:$${value}USD`
})
console.log(
formatPound(1000),
formatDollar(10000.0066),
formatEuro(100000.001),
customFormat(999999.555)
)Upvotes: 28
Reputation: 41
toLocaleString is good, but it doesn't work in all browsers. I usually use currencyFormatter.js (https://osrec.github.io/currencyFormatter.js/). It's pretty lightweight and contains all the currency and locale definitions right out of the box. It's also good at formatting unusually formatted currencies, such as the INR (which groups numbers in lakhs, crores, etc.). Also, there aren't any dependencies!
OSREC.CurrencyFormatter.format(2534234, { currency: 'INR' }); // Returns ₹ 25,34,234.00
OSREC.CurrencyFormatter.format(2534234, { currency: 'EUR' }); // Returns 2.534.234,00 €
OSREC.CurrencyFormatter.format(2534234, { currency: 'EUR', locale: 'fr' }); // Returns 2 534 234,00 €
Upvotes: 4
Reputation: 86
I want to contribute with this:
function toMoney(amount) {
neg = amount.charAt(0);
amount = amount.replace(/\D/g, '');
amount = amount.replace(/\./g, '');
amount = amount.replace(/\-/g, '');
var numAmount = new Number(amount);
amount = numAmount.toFixed(0).replace(/./g, function(c, i, a) {
return i > 0 && c !== "," && (a.length - i) % 3 === 0 ? "." + c : c;
});
if(neg == '-')
return neg + amount;
else
return amount;
}
This allows you to convert numbers in a text box where you are only supposed to put numbers (consider this scenario).
This is going to clean a textbox where there are only supposed to be numbers, even if you paste a string with numbers and letters or any character
<html>
<head>
<script language=="Javascript">
function isNumber(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode(key);
if (key.length == 0)
return;
var regex = /^[0-9\-\b]+$/;
if (!regex.test(key)) {
theEvent.returnValue = false;
if (theEvent.preventDefault)
theEvent.preventDefault();
}
}
function toMoney(amount) {
neg = amount.charAt(0);
amount = amount.replace(/\D/g, '');
amount = amount.replace(/\./g, '');
amount = amount.replace(/\-/g, '');
var numAmount = new Number(amount);
amount = numAmount.toFixed(0).replace(/./g, function(c, i, a) {
return i > 0 && c !== "," && (a.length - i) % 3 === 0 ? "." + c : c;
});
if(neg == '-')
return neg + amount;
else
return amount;
}
function clearText(inTxt, newTxt, outTxt) {
inTxt = inTxt.trim();
newTxt = newTxt.trim();
if(inTxt == '' || inTxt == newTxt)
return outTxt;
return inTxt;
}
function fillText(inTxt, outTxt) {
inTxt = inTxt.trim();
if(inTxt != '')
outTxt = inTxt;
return outTxt;
}
</script>
</head>
<body>
$ <input name=reca2 id=reca2 type=text value="0" onFocus="this.value = clearText(this.value, '0', '');" onblur="this.value = fillText(this.value, '0'); this.value = toMoney(this.value);" onKeyPress="isNumber(event);" style="width:80px;" />
</body>
</html>
Upvotes: 2
Reputation: 410
I found this from: accounting.js. It's very easy and perfectly fits my need.
// Default usage:
accounting.formatMoney(12345678); // $12,345,678.00
// European formatting (custom symbol and separators), can also use options object as second parameter:
accounting.formatMoney(4999.99, "€", 2, ".", ","); // €4.999,99
// Negative values can be formatted nicely:
accounting.formatMoney(-500000, "£ ", 0); // £ -500,000
// Simple `format` string allows control of symbol position (%v = value, %s = symbol):
accounting.formatMoney(5318008, { symbol: "GBP", format: "%v %s" }); // 5,318,008.00 GBP
// Euro currency symbol to the right
accounting.formatMoney(5318008, {symbol: "€", precision: 2, thousand: ".", decimal : ",", format: "%v%s"}); // 1.008,00€ Upvotes: 11
Reputation: 2445
tggagne is correct. My solution below is not good due to float rounding. And the toLocaleString function lacks some browser support. I'll leave the below comments for archival purposes of what not to do. :)
Date.prototype.toLocaleString()
(Old Solution) Use Patrick Desjardins' solution instead.
This is a terse solution that uses toLocaleString(), which has been supported since JavaScript version 1.0. This example designates the currency to U.S. Dollars, but could be switched to pounds by using 'GBP' instead of 'USD'.
var formatMoney = function (value) {
// Convert the value to a floating point number in case it arrives as a string.
var numeric = parseFloat(value);
// Specify the local currency.
return numeric.toLocaleString('USD', { style: 'currency', currency: "USD", minimumFractionDigits: 2, maximumFractionDigits: 2 });
}
See Internationalization and localization, Currencies for additional details.
Upvotes: 7
Reputation: 4144
There are already good answers. Here's a simple attempt for fun:
function currencyFormat(no) {
var ar = (+no).toFixed(2).split('.');
return [
numberFormat(ar[0] | 0),
'.',
ar[1]
].join('');
}
function numberFormat(no) {
var str = no + '';
var ar = [];
var i = str.length -1;
while(i >= 0) {
ar.push((str[i-2] || '') + (str[i-1] || '') + (str[i] || ''));
i = i-3;
}
return ar.reverse().join(',');
}
Then run some examples:
console.log(
currencyFormat(1),
currencyFormat(1200),
currencyFormat(123),
currencyFormat(9870000),
currencyFormat(12345),
currencyFormat(123456.232)
)
Upvotes: 2
Reputation: 79
Many of the answers had helpful ideas, but none of them could fit my needs. So I used all the ideas and build this example:
function Format_Numb(fmt){
var decimals = isNaN(decimals) ? 2 : Math.abs(decimals);
if(typeof decSgn === "undefined") decSgn = ".";
if(typeof kommaSgn === "undefined") kommaSgn= ",";
var s3digits = /(\d{1,3}(?=(\d{3})+(?=[.]|$))|(?:[.]\d*))/g;
var dflt_nk = "00000000".substring(0, decimals);
//--------------------------------
// handler for pattern: "%m"
var _f_money = function(v_in){
var v = v_in.toFixed(decimals);
var add_nk = ",00";
var arr = v.split(".");
return arr[0].toString().replace(s3digits, function ($0) {
return ($0.charAt(0) == ".")
? ((add_nk = ""), (kommaSgn + $0.substring(1)))
: ($0 + decSgn);
})
+ ((decimals > 0)
? (kommaSgn
+ (
(arr.length > 1)
? arr[1]
: dflt_nk
)
)
: ""
);
}
// handler for pattern: "%<len>[.<prec>]f"
var _f_flt = function(v_in, l, prec){
var v = (typeof prec !== "undefined") ? v_in.toFixed(prec) : v_in;
return ((typeof l !== "undefined") && ((l=l-v.length) > 0))
? (Array(l+1).join(" ") + v)
: v;
}
// handler for pattern: "%<len>x"
var _f_hex = function(v_in, l, flUpper){
var v = Math.round(v_in).toString(16);
if(flUpper) v = v.toUpperCase();
return ((typeof l !== "undefined") && ((l=l-v.length) > 0))
? (Array(l+1).join("0") + v)
: v;
}
//...can be extended..., just add the function, for example: var _f_octal = function( v_in,...){
//--------------------------------
if(typeof(fmt) !== "undefined"){
//...can be extended..., just add the char, for example "O": MFX -> MFXO
var rpatt = /(?:%([^%"MFX]*)([MFX]))|(?:"([^"]*)")|("|%%)/gi;
var _qu = "\"";
var _mask_qu = "\\\"";
var str = fmt.toString().replace(rpatt, function($0, $1, $2, $3, $4){
var f;
if(typeof $1 !== "undefined"){
switch($2.toUpperCase()){
case "M": f = "_f_money(v)"; break;
case "F": var n_dig0, n_dig1;
var re_flt =/^(?:(\d))*(?:[.](\d))*$/;
$1.replace(re_flt, function($0, $1, $2){
n_dig0 = $1;
n_dig1 = $2;
});
f = "_f_flt(v, " + n_dig0 + "," + n_dig1 + ")"; break;
case "X": var n_dig = "undefined";
var re_flt = /^(\d*)$/;
$1.replace(re_flt, function($0){
if($0 != "") n_dig = $0;
});
f = "_f_hex(v, " + n_dig + "," + ($2=="X") + ")"; break;
//...can be extended..., for example: case "O":
}
return "\"+"+f+"+\"";
} else if(typeof $3 !== "undefined"){
return _mask_qu + $3 + _mask_qu;
} else {
return ($4 == _qu) ? _mask_qu : $4.charAt(0);
}
});
var cmd = "return function(v){"
+ "if(typeof v === \"undefined\")return \"\";" // null returned as empty string
+ "if(!v.toFixed) return v.toString();" // not numb returned as string
+ "return \"" + str + "\";"
+ "}";
//...can be extended..., just add the function name in the 2 places:
return new Function("_f_money,_f_flt,_f_hex", cmd)(_f_money,_f_flt,_f_hex);
}
}
First, I needed a C-style format-string-definition that should be flexible, but very easy to use and I defined it in following way; patterns:
%[<len>][.<prec>]f float, example "%f", "%8.2d", "%.3f"
%m money
%[<len>]x hexadecimal lower case, example "%x", "%8x"
%[<len>]X hexadecimal upper case, example "%X", "%8X"
Because there isn't any need to format others than to euro for me, I implemented only "%m".
But it's easy to extend this... Like in C, the format string is a string containing the patterns. For example, for euro: "%m €" (returns strings like "8.129,33 €")
Besides the flexibility, I needed a very fast solution for processing tables. That means that, when processing thousands of cells, the processing of format string must not be done more than once. A call like "format( value, fmt)" is not acceptable for me, but this must be split into two steps:
// var formatter = Format_Numb( "%m €");
// simple example for Euro...
// but we use a complex example:
var formatter = Format_Numb("a%%%3mxx \"zz\"%8.2f°\" >0x%8X<");
// formatter is now a function, which can be used more than once (this is an example, that can be tested:)
var v1 = formatter(1897654.8198344);
var v2 = formatter(4.2);
... (and thousands of rows)
Also for performance, _f_money encloses the regular expression;
Third, a call like "format( value, fmt)" is not acceptable because:
Although it should be possible to format different collections of objects (for example, cells of a column) with different masks, I don't want to have something to handle format strings at the point of processing. At this point I only want to use formatting, like in
for( var cell in cells){ do_something( cell.col.formatter( cell.value)); }
What format - maybe it's defined in an .ini file, in an XML for each column or somewhere else ..., but analyzing and setting formats or dealing with internationalizaton is processed in totally another place, and there I want to assign the formatter to the collection without thinking about performance issues:
col.formatter = Format_Numb( _getFormatForColumn(...) );
Fourth, I wanted an "tolerant" solution, so passing, for example, a string instead of a number should return simply the string, but "null" should return en empty string.
(Also formatting "%4.2f" must not cut something if the value is too big.)
And last, but not least - it should be readable and easy extendable, without having any effects in performance... For example, if somebody needs "octal values", please refer to lines with "...can be extended..." - I think that should be a very easy task.
My overall focus lay on performance. Each "processing routine" (for example, _f_money) can be encapsulated optimized or exchanged with other ideas in this or other threads without change of the "prepare routines" (analyze format strings and creation of the functions), which must only be processed once and in that sense are not so performance critical like the conversion calls of thousands of numbers.
For all, who prefer methods of numbers:
Number.prototype.format_euro = (function(formatter){
return function(){ return formatter(this); }})
(Format_Numb( "%m €"));
var v_euro = (8192.3282).format_euro(); // results: 8.192,33 €
Number.prototype.format_hex = (function(formatter){
return function(){ return formatter(this); }})
(Format_Numb( "%4x"));
var v_hex = (4.3282).format_hex();
Although I tested some, there may be a lot of bugs in the code. So it's not a ready module, but just an idea and a starting point for non-JavaScript experts like me.
The code contains many and little modified ideas from a lot of Stack Overflow posts; sorry I can't reference all of them, but thanks to all the experts.
Upvotes: 3
Reputation: 6689
I like the shortest answer by VisionN except when I need to modify it for a number without a decimal point ($123 instead of $123.00). It does not work, so instead of quick copy/paste I need to decipher the arcane syntax of the JavaScript regular expression.
Here is the original solution
n.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
I'll make it a bit longer:
var re = /\d(?=(\d{3})+\.)/g;
var subst = '$&,';
n.toFixed(2).replace(re, subst);
The re part here (search part in string replace) means
- Find all digits (
\d) - Followed by (
?=...) (lookahead) - One or more groups
(...)+ - Of exactly three digits (
\d{3}) - Ending with a dot (
\.) - Do it for all occurrences (
g)
The subst part here means:
- Every time there is a match, replace it with itself (
$&), followed by a comma.
As we use string.replace, all other text in the string remains the same and only found digits (those that are followed by 3, 6, 9, etc. other digits) get an additional comma.
So in a number, 1234567.89, digits 1 and 4 meet the condition (1234567.89) and are replaced with "1," and "4," resulting in 1,234,567.89.
If we don't need the decimal point in dollar amount at all (i.e., $123 instead of $123.00), we may change the regular expression like this:
var re2 = /\d(?=(\d{3})+$)/g;
It relies on the end of line ($) instead of a dot (\.) and the final expression will be (notice also toFixed(0)):
n.toFixed(0).replace(/\d(?=(\d{3})+$)/g, '$&,');
This expression will give
1234567.89 -> 1,234,567
Also instead of end of line ($) in the regular expression above, you may opt for a word boundary as well (\b).
My apology in advance if I misinterpreted any part of the regular expression handling.
Upvotes: 3
Reputation: 778
var number = 3500;
alert(new Intl.NumberFormat().format(number));
// → "3,500" if in US English locale
Or PHP's number_format in JavaScript.
Upvotes: 5
Reputation: 83
The code from Jonathan M looked too complicated for me, so I rewrote it and got about 30% on Firefox v30 and 60% on Chrome v35 speed boost (http://jsperf.com/number-formating2):
Number.prototype.formatNumber = function(decPlaces, thouSeparator, decSeparator) {
decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces;
decSeparator = decSeparator == undefined ? "." : decSeparator;
thouSeparator = thouSeparator == undefined ? "," : thouSeparator;
var n = this.toFixed(decPlaces);
if (decPlaces) {
var i = n.substr(0, n.length - (decPlaces + 1));
var j = decSeparator + n.substr(-decPlaces);
} else {
i = n;
j = '';
}
function reverse(str) {
var sr = '';
for (var l = str.length - 1; l >= 0; l--) {
sr += str.charAt(l);
}
return sr;
}
if (parseInt(i)) {
i = reverse(reverse(i).replace(/(\d{3})(?=\d)/g, "$1" + thouSeparator));
}
return i + j;
};
Usage:
var sum = 123456789.5698;
var formatted = '$' + sum.formatNumber(2, ',', '.'); // "$123,456,789.57"
Upvotes: 4
Reputation: 507
Here is the short and best one to convert numbers into a currency format:
function toCurrency(amount){
return amount.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
}
// usage: toCurrency(3939920.3030);
Upvotes: 4
Reputation: 25942
Works for all current browsers
Use toLocaleString to format a currency in its language-sensitive representation (using ISO 4217 currency codes).
(2500).toLocaleString("en-GB", {style: "currency", currency: "GBP", minimumFractionDigits: 2})
Example South African Rand code snippets for avenmore:
console.log((2500).toLocaleString("en-ZA", {style: "currency", currency: "ZAR", minimumFractionDigits: 2}))
// -> R 2 500,00
console.log((2500).toLocaleString("en-GB", {style: "currency", currency: "ZAR", minimumFractionDigits: 2}))
// -> ZAR 2,500.00Upvotes: 87
Reputation: 3249
This answer meets the following criteria:
- Does not depend on an external dependency.
- Does support localization.
- Does have tests/proofs.
- Does use simple and best coding practices (no complicated regex's and uses standard coding patterns).
This code is built on concepts from other answers. Its execution speed should be among the better posted here if that's a concern.
var decimalCharacter = Number("1.1").toLocaleString().substr(1,1);
var defaultCurrencyMarker = "$";
function formatCurrency(number, currencyMarker) {
if (typeof number != "number")
number = parseFloat(number, 10);
// if NaN is passed in or comes from the parseFloat, set it to 0.
if (isNaN(number))
number = 0;
var sign = number < 0 ? "-" : "";
number = Math.abs(number); // so our signage goes before the $ symbol.
var integral = Math.floor(number);
var formattedIntegral = integral.toLocaleString();
// IE returns "##.00" while others return "##"
formattedIntegral = formattedIntegral.split(decimalCharacter)[0];
var decimal = Math.round((number - integral) * 100);
return sign + (currencyMarker || defaultCurrencyMarker) +
formattedIntegral +
decimalCharacter +
decimal.toString() + (decimal < 10 ? "0" : "");
}
These tests only work on a US locale machine. This decision was made for simplicity and because this could cause of crappy input (bad auto-localization) allowing for crappy output issues.
var tests = [
// [ input, expected result ]
[123123, "$123,123.00"], // no decimal
[123123.123, "$123,123.12"], // decimal rounded down
[123123.126, "$123,123.13"], // decimal rounded up
[123123.4, "$123,123.40"], // single decimal
["123123", "$123,123.00"], // repeat subset of the above using string input.
["123123.123", "$123,123.12"],
["123123.126", "$123,123.13"],
[-123, "-$123.00"] // negatives
];
for (var testIndex=0; testIndex < tests.length; testIndex++) {
var test = tests[testIndex];
var formatted = formatCurrency(test[0]);
if (formatted == test[1]) {
console.log("Test passed, \"" + test[0] + "\" resulted in \"" + formatted + "\"");
} else {
console.error("Test failed. Expected \"" + test[1] + "\", got \"" + formatted + "\"");
}
}
Upvotes: 4
Reputation: 2496
I based this heavily on the answer from VisioN:
function format (val) {
val = (+val).toLocaleString();
val = (+val).toFixed(2);
val += "";
return val.replace(/(\d)(?=(\d{3})+(?:\.\d+)?$)/g, "$1" + format.thousands);
}
(function (isUS) {
format.decimal = isUS ? "." : ",";
format.thousands = isUS ? "," : ".";
}(("" + (+(0.00).toLocaleString()).toFixed(2)).indexOf(".") > 0));
I tested with inputs:
[ ""
, "1"
, "12"
, "123"
, "1234"
, "12345"
, "123456"
, "1234567"
, "12345678"
, "123456789"
, "1234567890"
, ".12"
, "1.12"
, "12.12"
, "123.12"
, "1234.12"
, "12345.12"
, "123456.12"
, "1234567.12"
, "12345678.12"
, "123456789.12"
, "1234567890.12"
, "1234567890.123"
, "1234567890.125"
].forEach(function (item) {
console.log(format(item));
});
And got these results:
0.00
1.00
12.00
123.00
1,234.00
12,345.00
123,456.00
1,234,567.00
12,345,678.00
123,456,789.00
1,234,567,890.00
0.12
1.12
12.12
123.12
1,234.12
12,345.12
123,456.12
1,234,567.12
12,345,678.12
123,456,789.12
1,234,567,890.12
1,234,567,890.12
1,234,567,890.13
Just for fun.
Upvotes: 3
Reputation: 779
This might be a little late, but here's a method I just worked up for a coworker to add a locale-aware .toCurrencyString() function to all numbers. The internalization is for number grouping only, not the currency sign - if you're outputting dollars, use "$" as supplied, because $123 4567 in Japan or China is the same number of USD as $1,234,567 is in the US. If you're outputting euro, etc., then change the currency sign from "$".
Declare this anywhere in your HTML <head> section or wherever necessary, just before you need to use it:
Number.prototype.toCurrencyString = function(prefix, suffix) {
if (typeof prefix === 'undefined') { prefix = '$'; }
if (typeof suffix === 'undefined') { suffix = ''; }
var _localeBug = new RegExp((1).toLocaleString().replace(/^1/, '').replace(/\./, '\\.') + "$");
return prefix + (~~this).toLocaleString().replace(_localeBug, '') + (this % 1).toFixed(2).toLocaleString().replace(/^[+-]?0+/,'') + suffix;
}
Then you're done! Use (number).toCurrencyString() anywhere you need to output the number as currency.
var MyNumber = 123456789.125;
alert(MyNumber.toCurrencyString()); // alerts "$123,456,789.13"
MyNumber = -123.567;
alert(MyNumber.toCurrencyString()); // alerts "$-123.57"
Upvotes: 14
Reputation: 48893
http://code.google.com/p/javascript-number-formatter/:
- Short, fast, flexible yet stand-alone. Only 75 lines including MIT license info, blank lines & comments.
- Accept standard number formatting like #,##0.00 or with negation -000.####.
- Accept any country format like # ##0,00, #,###.##, #'###.## or any type of non-numbering symbol.
- Accept any numbers of digit grouping. #,##,#0.000 or #,###0.## are all valid.
- Accept any redundant/fool-proof formatting. ##,###,##.# or 0#,#00#.###0# are all OK.
- Auto number rounding.
- Simple interface, just supply mask & value like this: format( "0.0000", 3.141592)
UPDATE This is my home-grown pp utilities for most common tasks:
var NumUtil = {};
/**
Petty print 'num' wth exactly 'signif' digits.
pp(123.45, 2) == "120"
pp(0.012343, 3) == "0.0123"
pp(1.2, 3) == "1.20"
*/
NumUtil.pp = function(num, signif) {
if (typeof(num) !== "number")
throw 'NumUtil.pp: num is not a number!';
if (isNaN(num))
throw 'NumUtil.pp: num is NaN!';
if (num < 1e-15 || num > 1e15)
return num;
var r = Math.log(num)/Math.LN10;
var dot = Math.floor(r) - (signif-1);
r = r - Math.floor(r) + (signif-1);
r = Math.round(Math.exp(r * Math.LN10)).toString();
if (dot >= 0) {
for (; dot > 0; dot -= 1)
r += "0";
return r;
} else if (-dot >= r.length) {
var p = "0.";
for (; -dot > r.length; dot += 1) {
p += "0";
}
return p+r;
} else {
return r.substring(0, r.length + dot) + "." + r.substring(r.length + dot);
}
}
/** Append leading zeros up to 2 digits. */
NumUtil.align2 = function(v) {
if (v < 10)
return "0"+v;
return ""+v;
}
/** Append leading zeros up to 3 digits. */
NumUtil.align3 = function(v) {
if (v < 10)
return "00"+v;
else if (v < 100)
return "0"+v;
return ""+v;
}
NumUtil.integer = {};
/** Round to integer and group by 3 digits. */
NumUtil.integer.pp = function(num) {
if (typeof(num) !== "number") {
console.log("%s", new Error().stack);
throw 'NumUtil.integer.pp: num is not a number!';
}
if (isNaN(num))
throw 'NumUtil.integer.pp: num is NaN!';
if (num > 1e15)
return num;
if (num < 0)
throw 'Negative num!';
num = Math.round(num);
var group = num % 1000;
var integ = Math.floor(num / 1000);
if (integ === 0) {
return group;
}
num = NumUtil.align3(group);
while (true) {
group = integ % 1000;
integ = Math.floor(integ / 1000);
if (integ === 0)
return group + " " + num;
num = NumUtil.align3(group) + " " + num;
}
return num;
}
NumUtil.currency = {};
/** Round to coins and group by 3 digits. */
NumUtil.currency.pp = function(amount) {
if (typeof(amount) !== "number")
throw 'NumUtil.currency.pp: amount is not a number!';
if (isNaN(amount))
throw 'NumUtil.currency.pp: amount is NaN!';
if (amount > 1e15)
return amount;
if (amount < 0)
throw 'Negative amount!';
if (amount < 1e-2)
return 0;
var v = Math.round(amount*100);
var integ = Math.floor(v / 100);
var frac = NumUtil.align2(v % 100);
var group = integ % 1000;
integ = Math.floor(integ / 1000);
if (integ === 0) {
return group + "." + frac;
}
amount = NumUtil.align3(group);
while (true) {
group = integ % 1000;
integ = Math.floor(integ / 1000);
if (integ === 0)
return group + " " + amount + "." + frac;
amount = NumUtil.align3(group) + " " + amount;
}
return amount;
}
Upvotes: 5
Reputation: 209
I suggest the NumberFormat class from Google Visualization API.
You can do something like this:
var formatter = new google.visualization.NumberFormat({
prefix: '$',
pattern: '#,###,###.##'
});
formatter.formatValue(1000000); // $ 1,000,000
Upvotes: 15
Reputation: 191
Numeral.js - a JavaScript library for easy number formatting by @adamwdraper
numeral(23456.789).format('$0,0.00'); // = "$23,456.79"
Upvotes: 29
Reputation: 3503
CoffeeScript for Patrick's popular answer:
Number::formatMoney = (decimalPlaces, decimalChar, thousandsChar) ->
n = this
c = decimalPlaces
d = decimalChar
t = thousandsChar
c = (if isNaN(c = Math.abs(c)) then 2 else c)
d = (if d is undefined then "." else d)
t = (if t is undefined then "," else t)
s = (if n < 0 then "-" else "")
i = parseInt(n = Math.abs(+n or 0).toFixed(c)) + ""
j = (if (j = i.length) > 3 then j % 3 else 0)
s + (if j then i.substr(0, j) + t else "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (if c then d + Math.abs(n - i).toFixed(c).slice(2) else "")
Upvotes: 2
Related Questions
- Javascript How To Format An Integer As A Currency String?
- Format as currency in Javascript
- Formatting numbers for currency in js
- Currency formatting of JavaScript created numbers
- converting the number to the required currency format
- How do I print currency format in JavaScript
- Javascript currency formatting
- Format number to dollar
- Javascript to format number as currency
- Format currency using javascript