How to insert space every 4 characters for IBAN registering?

Question

I\'m really new in JavaScript and I would like to add to my input text, space insertion for IBAN account registering.

Answer 1

You have to capture each group of 4 digits and then put a space between each group.

  $('input').blur(function () {
  //Replace each group 4 digits  with a group plus a space
        var reformat = this.value.replace(/(\d{4})/g, function(match){
        return match + " ";
        });
        this.value = reformat;
    })

And this one updates the element while typing

 //Keys pressed 0 times
var downed = 0; 
$('#test').keydown(function (g) {
    if(g.code.match("^Digit")){
        downed++;
      console.log(g)
    }

    if(downed == 1){
        var reformat = this.value.replace(/(\d{4}\s*)/g, function(match){
            //Strip spaces
            if(match.match(/\s/)){return match;}
            return match + " ";
    });
    console.log(reformat);
    this.value = reformat; 
    //Start recount
        downed = 0;
    }
});

Check out the fiddle