one click both check code example

Example 1: one click both check

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<h4>This is a domo to show check box is checked
if you enter value 1 else check box will be unchecked </h4>
Enter a value:
<input type="text" value="" class="customvalue">
<br>checkbox output :
<input type="checkbox" class="customcheckbox">

Example 2: one click both check

$(document).ready(function() {
  var chkbox = $('.customcheckbox');
  $(".customvalue").keyup(function() {
    chkbox.prop('checked', this.value==1);
  });
});