Add value in Javascript after another input

Question

How to automatically Add value +1 after keyup?

<input id="tahun1" name="tahun1" type="number"> 
<input id="tahun2" name="tahun2" type="number" readonly>

<script>
$("#tahun1").keyup(function(){
$("#tahun2").val(this.value);});
</script>

for example if I insert "2015" in "tahun1" then in "tahun2" should be "2016" automatically

thanks in advance :)

Pranav C Balan · Accepted Answer · 2016-05-11 08:10:13Z

1

Parse the value using Number() or parseInt() then increment the value and update the input field.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input id="tahun1" name="tahun1" type="number">
<input id="tahun2" name="tahun2" type="number" readonly>

<script>
  $("#tahun1").keyup(function() {
    $("#tahun2").val(Number(this.value) + 1);
  });
</script>

edited May 11, 2016 at 8:10

answered May 11, 2016 at 8:07

Pranav C Balan

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1 Comment

Pranav C Balan Over a year ago

@afhamz : glad to help :)

Jitendra Tiwari · Accepted Answer · 2016-05-11 08:08:54Z

0

Try this

$("#tahun1").keyup(function(){
  
    $("#tahun2").val(parseInt($(this).val())+1);
  
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="tahun1" name="tahun1" type="number"> 
<input id="tahun2" name="tahun2" type="number" readonly>

answered May 11, 2016 at 8:08

Jitendra Tiwari

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