How to clone typing to every input from the first box with jquery on checkbox checked?

I want to clone/duplicate the typing of the first input of each column in to the child boxes of the same class/id.

For example, there're 5 columns of data. Each column has its own class and specific ids. Once I start typing on the top input of each column and the checkbox checked. The following/child inputs of that column start typing the same stroke.

JS

var $input1 = $(document).find('input[id^="box"]').filter(':visible:first'); //find the first input begins with *box or other same id???
$($input1).keypress(function() { //duplicate the first box typing
  var $this = $(this);
  window.setTimeout(function() { //delay a bit
    if ($('#cloneAll').is(':checked')) { //if checkbox empty
      $('*[id^="box"]').val($this.val()).attr('readonly', true); //clone all inputs and set them readonly
    }
  }, 0);
});

html

 1.<input type="text" value="" id="box1" /><label><input type="checkbox" id="cloneAll" />clone all</label>
<br /> 2.<input type="text" value="" id="box2" />
<br /> 3.<input type="text" value="" id="box3" />
<br /> 4.<input type="text" value="" id="box4" />
<br /> 5.<input type="text" value="" id="box5" />
<br /> .
<br /> .
<br /> .
<br /> 100.<input type="text" value="" id="box100" /><br />

The questions are:

  1. How to find the first input of each set of class/id and set it as a prototype?
  2. How to continue typing the following input without stuck when a checkbox checked?

Fiddle or

var $input1 = $(document).find('input[id^="box"]').filter(':visible:first'); //find the first input begins with *box or other same id???
$($input1).keypress(function() { //duplicate the first box typing
  var $this = $(this);
  window.setTimeout(function() { //delay a bit
    if ($('#cloneAll').is(':checked')) { //if checkbox empty
      $('*[id^="box"]').val($this.val()).attr('readonly', true); //clone all inputs and set them readonly
    }
  }, 0);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
1.
<input type="text" value="" id="box1" />
<label>
  <input type="checkbox" id="cloneAll" />clone all</label>
<br /> 2.
<input type="text" value="" id="box2" />
<br /> 3.
<input type="text" value="" id="box3" />
<br /> 4.
<input type="text" value="" id="box4" />
<br /> 5.
<input type="text" value="" id="box5" />
<br /> .
<br /> .
<br /> .
<br /> 100.
<input type="text" value="" id="box100" />
<br />

Answers:

Answer

This line in your code is setting all the input boxes to readonly and preventing you from typing in the first box as well.

$('*[id^="box"]').val($this.val()).attr('readonly', true); //clone all inputs and set them readonly

If you add this line beneath it, it will allow you to continue typing in the first box.

$input1.attr('readonly', false);

Updated Fiddle: http://jsfiddle.net/be9br09j/2/

Updated Snippet

var $input1 = $(document).find('input[id^="box"]').filter(':visible:first'); //find the first input begins with *box or other same id???
$($input1).keypress(function() { //duplicate the first box typing
  var $this = $(this);
  window.setTimeout(function() { //delay a bit
    if ($('#cloneAll').is(':checked')) { //if checkbox empty
      $('*[id^="box"]').val($this.val()).attr('readonly', true); //clone all inputs and set them readonly
      $input1.attr('readonly', false);
    }
  }, 0);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
1.
<input type="text" value="" id="box1" />
<label>
  <input type="checkbox" id="cloneAll" />clone all</label>
<br /> 2.
<input type="text" value="" id="box2" />
<br /> 3.
<input type="text" value="" id="box3" />
<br /> 4.
<input type="text" value="" id="box4" />
<br /> 5.
<input type="text" value="" id="box5" />
<br /> .
<br /> .
<br /> .
<br /> 100.
<input type="text" value="" id="box100" />
<br />

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