I want to add a space between every 4 characters. I'm developing a webpage about credit card numbers.
example
var x = document.getElementById("card_number").value;
example : if the value of x is 1234567890123456
I need to split this number every 4 characters and add a space. Like this
1234 5678 9012 3456
and I need this number on a variable. Because I need to set this number on the textbox. Please help me. thanks
You can use RegEx for this
const dummyTxt = '1234567890123456';
const joy = dummyTxt.match(/.{1,4}/g);
console.log(joy.join(' '));
You could look for four characters with a positive lookahead for more characters and insert a space after each block.
function format(s) {
return s.toString().replace(/\d{4}(?=.)/g, '$& ');
}
console.log(format(1234567890123456));
replace(/\w... better because IBANs sometimes start with FR or alike.Without regex, you can use map as well to achieve this
let x = '1234567890123456'
let res = [...x].map((d, i) => (i) % 4 == 0 ? ' ' + d : d).join('').trim()
console.log(res)
