I have modified you JSFiddle code - https://jsfiddle.net/pjf17exa/
As per your code, i have fixed some error and modified you code to make it dynamic input action.
// your code
var wrapper = $(".select-editable"); //Fields wrapper
$(wrapper).on('keypress', '#input1', function () {
var cs = $(this).val().length+1;
console.log( "total caracters:" + cs);
$('#mytext1').html('<option value="dummy01">dummy01</option><option
value="dummy02">dummy02</option><option
value="dummy03">dummy03</option>')
});
-- which assigns event for the current row, not for the dynamic elements. So instead take parent element and assign event for the input. Where you can access current element using $(this) instance inside the function.
// do like this
var wrapper = $("#table-editable");
wrapper.on('keypress', 'input', function () {
var cs = $(this).val().length+1;
console.log( "total caracters:" + cs, $(this));
$(this).prev().html('<option value="dummy01">dummy01</option><option value="dummy02">dummy02</option><option value="dummy03">dummy03</option>')
});