Is there a simple way to format numbers in JavaScript, similar to the formatting methods available in C# (or VB.NET) via ToString("format_provider") or String.Format()?
Generally
Formatting numbers in JavaScript
Formatting numbers for currency display and more.
In jQuery
autoNumeric (a decent number formatter & input helper with locale support for jQuery 1.5+)
jQuery Format (a clientSide implementation of Java's SimpleDateFormat and NumberFormat)
jquery-numberformatter (number formatter with locale support)
Yes, there is definitely a way to format numbers properly in javascript, for example:
var val=2489.8237
val.toFixed(3) //returns 2489.824 (round up)
val.toFixed(2) //returns 2489.82
val.toFixed(7) //returns 2489.8237000 (padding)
With the use of variablename.toFixed .
And there is another function toPrecision() .
For more detail you also can visit
http://raovishal.blogspot.com/2012/01/number-format-in-javascript.html
Here's a simple JS function to add commas to an integer number in string format. It will handle whole numbers or decimal numbers. You can pass it either a number or a string. It obviously returns a string.
function addCommas(str) {
var parts = (str + "").split("."),
main = parts[0],
len = main.length,
output = "",
first = main.charAt(0),
i;
if (first === '-') {
main = main.slice(1);
len = main.length;
} else {
first = "";
}
i = len - 1;
while(i >= 0) {
output = main.charAt(i) + output;
if ((len - i) % 3 === 0 && i > 0) {
output = "," + output;
}
--i;
}
// put sign back
output = first + output;
// put decimal part back
if (parts.length > 1) {
output += "." + parts[1];
}
return output;
}
Here's a set of test cases: http://jsfiddle.net/jfriend00/6y57j/
You can see it being used in this previous jsFiddle: http://jsfiddle.net/jfriend00/sMnjT/. You can find functions that will handle decimal numbers too with a simple Google search for "javascript add commas".
Converting a number to a string can be done many ways. The easiest is just to add it to a string:
var myNumber = 3;
var myStr = "" + myNumber; // "3"
Within, the context of your jsFiddle, you'd get commas into the counter by changing this line:
jTarget.text(current);
to this:
jTarget.text(addCommas(current));
You can see it working here: http://jsfiddle.net/jfriend00/CbjSX/
I wrote a simple function (not yet another jQuery plugin needed!!) that converts a number to a decimal separated string or an empty string if the number wasn't a number to begin with:
function format(x) {
return isNaN(x)?"":x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
format(578999); results in 578,999
format(10); results in 10
if you want to have a decimal point instead of a comma simply replace the comma in the code with a decimal point.
One of the comments correctly stated this only works for integers, with a few small adaptions you can make it work for floating points as well:
function format(x) {
if(isNaN(x))return "";
n= x.toString().split('.');
return n[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")+(n.length>1?"."+n[1]:"");
}
Here are some solutions, all pass the test suite, test suite and benchmark included, if you want copy and paste to test, try This Gist.
Method 0 (RegExp)
Base on https://stackoverflow.com/a/14428340/1877620, but fix if there is no decimal point.
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.');
a[0] = a[0].replace(/\d(?=(\d{3})+$)/g, '$&,');
return a.join('.');
}
}
Method 1
if (typeof Number.prototype.format1 === 'undefined') {
Number.prototype.format1 = function (precision) {
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, ',$&');
return a.join('.');
};
}
Method 2 (Split to Array)
if (typeof Number.prototype.format2 === 'undefined') {
Number.prototype.format2 = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.');
a[0] = a[0]
.split('').reverse().join('')
.replace(/\d{3}(?=\d)/g, '$&,')
.split('').reverse().join('');
return a.join('.');
};
}
Method 3 (Loop)
if (typeof Number.prototype.format3 === 'undefined') {
Number.prototype.format3 = 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('');
};
}
Example
console.log('======== Demo ========')
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 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');
}
async = [];
function next() {
setTimeout(function () {
f = async.shift();
f && f();
next();
}, 10);
}
console.log('======== Benchmark ========');
async.push(function () { benchmark_format(Number.prototype.format); });
async.push(function () { benchmark_format(Number.prototype.format1); });
async.push(function () { benchmark_format(Number.prototype.format2); });
async.push(function () { benchmark_format(Number.prototype.format3); });
next();
If you don't want to use jQuery, take a look at Numeral.js
Firstly, converting an integer into string in JS is really simple:
// Start off with a number
var number = 42;
// Convert into a string by appending an empty (or whatever you like as a string) to it
var string = 42+'';
// No extra conversion is needed, even though you could actually do
var alsoString = number.toString();
If you have a number as a string and want it to be turned to an integer, you have to use the parseInt(string) for integers and parseFloat(string) for floats. Both of these functions then return the desired integer/float. Example:
// Start off with a float as a string
var stringFloat = '3.14';
// And an int as a string
var stringInt = '42';
// typeof stringInt would give you 'string'
// Get the real float from the string
var realFloat = parseFloat(someFloat);
// Same for the int
var realInt = parseInt(stringInt);
// but typeof realInt will now give you 'number'
What exactly are you trying to append etc, remains unclear to me from your question.
http://code.google.com/p/javascript-number-formatter/ :
Short, fast, flexible yet standalone. 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
As say Tomáš Zato here one line solution:
(666.0).toLocaleString()
numObj.toLocaleString([locales [, options]])
which described in ECMA-262 5.1 Edition:
http://www.ecma-international.org/ecma-262/5.1/#sec-15.7.4.3
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
and will work in future versions of browsers...
For example:
var flt = '5.99';
var nt = '6';
var rflt = parseFloat(flt);
var rnt = parseInt(nt);
Using JQuery.
$(document).ready(function()
{
//Only number and one dot
function onlyDecimal(element, decimals)
{
$(element).keypress(function(event)
{
num = $(this).val() ;
num = isNaN(num) || num === '' || num === null ? 0.00 : num ;
if ((event.which != 46 || $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57))
{
event.preventDefault();
}
if($(this).val() == parseFloat(num).toFixed(decimals))
{
event.preventDefault();
}
});
}
onlyDecimal("#TextBox1", 3) ;
});
To get a decimal with 2 numbers after the comma, you could just use:
function nformat(a) {
var b = parseInt(parseFloat(a)*100)/100;
return b.toFixed(2);
}
May I suggest numbro for locale based formatting and number-format.js for the general case. A combination of the two depending on use-case may help.
Here's another version:
$.fn.digits = function () {
return this.each(function () {
var value = $(this).text();
var decimal = "";
if (value) {
var pos = value.indexOf(".");
if (pos >= 0) {
decimal = value.substring(pos);
value = value.substring(0, pos);
}
if (value) {
value = value.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
if (!String.isNullOrEmpty(decimal)) value = (value + decimal);
$(this).text(value);
}
}
else {
value = $(this).val()
if (value) {
var pos = value.indexOf(".");
if (pos >= 0) {
decimal = value.substring(pos);
value = value.substring(0, pos);
}
if (value) {
value = value.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
if (!String.isNullOrEmpty(decimal)) value = (value + decimal);
$(this).val(value);
}
}
}
})
};
I made a simple function, maybe someone can use it
function secsToTime(secs){
function format(number){
if(number===0){
return '00';
}else {
if (number < 10) {
return '0' + number
} else{
return ''+number;
}
}
}
var minutes = Math.floor(secs/60)%60;
var hours = Math.floor(secs/(60*60))%24;
var days = Math.floor(secs/(60*60*24));
var seconds = Math.floor(secs)%60;
return (days>0? days+"d " : "")+format(hours)+':'+format(minutes)+':'+format(seconds);
}
this can generate the followings outputs:
5d 02:53:39
4d 22:15:16
03:01:05
00:00:00
In case you want to format number for view rather than for calculation you can use this
function numberFormat( number ){
var digitCount = (number+"").length;
var formatedNumber = number+"";
var ind = digitCount%3 || 3;
var temparr = formatedNumber.split('');
if( digitCount > 3 && digitCount <= 6 ){
temparr.splice(ind,0,',');
formatedNumber = temparr.join('');
}else if (digitCount >= 7 && digitCount <= 15) {
var temparr2 = temparr.slice(0, ind);
temparr2.push(',');
temparr2.push(temparr[ind]);
temparr2.push(temparr[ind + 1]);
// temparr2.push( temparr[ind + 2] );
if (digitCount >= 7 && digitCount <= 9) {
temparr2.push(" million");
} else if (digitCount >= 10 && digitCount <= 12) {
temparr2.push(" billion");
} else if (digitCount >= 13 && digitCount <= 15) {
temparr2.push(" trillion");
}
formatedNumber = temparr2.join('');
}
return formatedNumber;
}
Input: {Integer} Number
Outputs: {String} Number
22,870 => if number 22870
22,87 million => if number 2287xxxx (x can be whatever)
22,87 billion => if number 2287xxxxxxx
22,87 trillion => if number 2287xxxxxxxxxx
You get the idea
To further jfriend00's answer (I dont't have enough points to comment) I have extended his/her answer to the following:
function log(args) {
var str = "";
for (var i = 0; i < arguments.length; i++) {
if (typeof arguments[i] === "object") {
str += JSON.stringify(arguments[i]);
} else {
str += arguments[i];
}
}
var div = document.createElement("div");
div.innerHTML = str;
document.body.appendChild(div);
}
Number.prototype.addCommas = function (str) {
if (str === undefined) {
str = this;
}
var parts = (str + "").split("."),
main = parts[0],
len = main.length,
output = "",
first = main.charAt(0),
i;
if (first === '-') {
main = main.slice(1);
len = main.length;
} else {
first = "";
}
i = len - 1;
while(i >= 0) {
output = main.charAt(i) + output;
if ((len - i) % 3 === 0 && i > 0) {
output = "," + output;
}
--i;
}
// put sign back
output = first + output;
// put decimal part back
if (parts.length > 1) {
output += "." + parts[1];
}
return output;
}
var testCases = [
1, 12, 123, -1234, 12345, 123456, -1234567, 12345678, 123456789,
-1.1, 12.1, 123.1, 1234.1, -12345.1, -123456.1, -1234567.1, 12345678.1, 123456789.1
];
for (var i = 0; i < testCases.length; i++) {
log(testCases[i].addCommas());
}
/*for (var i = 0; i < testCases.length; i++) {
log(Number.addCommas(testCases[i]));
}*/
You can do it in the following way:
So you will not only format the number but you can also pass as a parameter how many decimal digits to display, you set a custom decimal and mile separator.
function format(number, decimals = 2, decimalSeparator = '.', thousandsSeparator = ',') {
const roundedNumber = number.toFixed(decimals);
let integerPart = '', fractionalPart = '';
if (decimals == 0) {
integerPart = roundedNumber;
decimalSeparator = '';
} else {
let numberParts = roundedNumber.split('.');
integerPart = numberParts[0];
fractionalPart = numberParts[1];
}
integerPart = integerPart.replace(/(\d)(?=(\d{3})+(?!\d))/g, `$1${thousandsSeparator}`);
return `${integerPart}${decimalSeparator}${fractionalPart}`;
}
Use:
let min = 1556454.0001;
let max = 15556982.9999;
console.time('number format');
for (let i = 0; i < 15000; i++) {
let randomNumber = Math.random() * (max - min) + min;
let formated = format(randomNumber, 4, ',', '.'); // formated number
console.debug('number: ', randomNumber, 'formated: ', formated);
}
console.timeEnd('number format');
<script type="text/javascript">
var t;
function startTimer(){
t=setTimeout("document.location='../login/logout.php'", 50000);
}
function stopTimer(){
clearTimeout(t);
}
</script>
This is my script for auto logout,
i want to show the countdown timer, How to create and show the timer,
Also i want to make alive when the user hit the body of the page,
Also timer should reset and then restart again when system is idle,
How to make it,
(Timer should show , that is ,
timer should run when people not touching the system ,
if user touch the system then counter should restart )
Use this function:
function timer(elem, starttime, endtime, speed, funktion, count) {
if (!endtime) endtime = 0;
if (!starttime) starttime = 10;
if (!speed) speed = 1;
speed = speed * 1000;
if ($(elem).html() || $(elem).val()) {
if (count == "next" && starttime > endtime) starttime--;
else if (count == "next" && starttime < endtime) starttime++;
if ($(elem).html()) $(elem).html(starttime);
else if ($(elem).val()) $(elem).val(starttime);
if (starttime != endtime && $(elem).html()) setTimeout(function() {
timer(elem, $(elem).html(), endtime, speed / 1000, funktion, 'next');
}, speed);
if (starttime != endtime && $(elem).val()) setTimeout(function() {
timer(elem, $(elem).val(), endtime, speed / 1000, funktion, 'next');
}, speed);
if (starttime == endtime && funktion) funktion();
} else return;
}
Example
timer("#timer", 50, 0, 1, function() {
location.href = "../login/logout.php";
});
my example:
Updated to check if the user is Idle (is set to 2 seconds, this makes testing easier, i'd recommend at least 5 or 10 minutes).
<body onload="setTimeout('startCountDown()',2000);" onmousemove="resetTimer();">
<form name="counter"><input type="text" size="5" name="timer" disabled="disabled" /></form>
<script type="text/javascript">
<!--
// edit startSeconds as you see fit
// simple timer example provided by Thomas
var startSeconds = 10;
var milisec = 0;
var seconds=startSeconds;
var countdownrunning = false
var idle = false;
document.counter.timer.value=startSeconds;
function CountDown()
{
if(idle == true)
{
if (milisec<=0)
{
milisec=9
seconds-=1
}
if (seconds<=-1)
{
document.location='../login/logout.php';
milisec=0
seconds+=1
return;
}
else
milisec-=1;
document.counter.timer.value=seconds+"."+milisec;
setTimeout("CountDown()",100);
}
else
{
return;
}
}
function startCountDown()
{
document.counter.timer.value=startSeconds;
seconds = startSeconds;
milisec = 0
document.counter.timer.style.display = 'block';
idle = true;
CountDown();
document.getElementById("alert").innerHTML = 'You are idle. you will be logged out after ' + startSeconds + ' seconds.';
countdownrunning = false;
}
function resetTimer()
{
document.counter.timer.style.display = 'none';
idle = false;
document.getElementById("alert").innerHTML = '';
if(!countdownrunning)
setTimeout('startCountDown()',2000);
countdownrunning = true;
}
-->
</script>
my code here...after modified a bit...it works for me...
var startSeconds = 10;
var milisec = 0;
var seconds=startSeconds;
var countdownrunning = false
var idle = false;
document.counter.timer.value=startSeconds;
function CountDown()
{
if(idle == true)
{
if (milisec<=0)
{
milisec=9
seconds-=1
}
if (seconds<=-1)
{
document.location='../login/logout.php';
milisec=0
seconds+=1
return;
}
else
seconds-=1;
setTimeout("CountDown()",1000);
}
else
{
return;
}
}
function startCountDown()
{
seconds = startSeconds;
milisec = 0
idle = true;
CountDown();
document.getElementById("alert").innerHTML = 'You are idle. you will be logged out after ' + startSeconds + ' seconds.';
countdownrunning = false;
}
function resetTimer()
{
idle = false;
if(countdownrunning)
setTimeout('startCountDown()',2000);
countdownrunning = true;
}