How to Format Numbers as Percentage Values in Javascript?
Was Using Extjs for Formatting Numbers to Percentage Earlier. Now as We Are Not Using Extjs Anymore Same Has to Be Accomplished Using Normal Javascript. Need a...
Was using ExtJS for formatting numbers to percentage earlier. Now as we are not using ExtJS anymore same has to be accomplished using normal JavaScript.
Need a method that will take number and format (usually in %) and convert that number to that format.
0 -> 0.00% = 0.00%
25 -> 0.00% = 25.00%
50 -> 0.00% = 50.00%
150 -> 0.00% = 150.00%
6 Answers
You can use Number.toLocaleString():
var num=25;
var s = Number(num/100).toLocaleString(undefined,{style: 'percent', minimumFractionDigits:2});
console.log(s);25.00%
See documentation for toLocaleString() for more options for the format object parameter.
Here is what you need.
var x=150;
console.log(parseFloat(x).toFixed(2)+"%");
x=0;
console.log(parseFloat(x).toFixed(2)+"%");
x=10
console.log(parseFloat(x).toFixed(2)+"%");Modern JS:
For any of these, remove * 100 if you start with a whole number instead of decimal.
Basic
const displayPercent = (percent) => `${(percent * 100).toFixed(2)}%`;
Dynamic with safe handling for undefined values
const displayPercent = (percent, fallback, digits = 2) =>
(percent === null || percent === undefined) ? fallback : `${(percent * 100).toFixed(digits)}%`;
Typescript:
const displayPercent = (percent: number) => `${(percent * 100).toFixed(2)}%`;
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
function myFunction(num) {
number = num.toString();;
console.log(number)
var words2 = number.split(".");
for (var i = 0; i < words2.length; i++) {
words2[i] += " ";
}
num1 = words2[0];
num2 = words2[1];
num1 = num1.trim();
if(num2==undefined){
number1 = num1+'.00%';
return number1;
}else{
num2 = num2.trim();
number1 = num1+'.'+num2+'%';
return number1;
}
}
document.getElementById("demo").innerHTML = myFunction(50.12);
</script>
</body>
</html>
I had decimal values such as 0.01235 and 0.016858542 that I wanted to convert to percentages 1.235% and 1.6858542% respectively. I thought it was going to be easy, just calculate (0.012858542 * 100) and I'm good to go. I was wrong, (0.012858542 * 100) = 1.2858542000000002 because of decimal conversion.
Let's add toFixed() to the calculation and I end up with the right value.
(0.012858542*100).toFixed(7) // returns "1.2858542"
(0.01235*100).toFixed(7) // returns "1.2350000"
I don't like to show four trailing zeros when they're unnecessary. One solution I thought about was to use replace() to remove all trailing zeros but I ended up using Numeral.js instead because it does all the work for me while it's lightweight. I can recommend it!
import numeral from 'numeral';
numeral(0.012858542 * 100).format('0.00[0000]') // returns "1.2858542"
numeral(0.01235 * 100).format('0.00[0000]') // returns "1.235"
Transform number to percentage with X float decimal positions
function toPercent(number, float) {
var percent = parseFloat(number * 100).toFixed(float) + "%";
return percent;
}
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
