Question

what i want is that changing textbox value with checkbox. when checkbox is checked, textbox must be ‘2020-01-01’

I did this

$('#checkPub').click(function() {
   $("#demo1").val('2020-01-01');
});

It gives only me the checkbox as output why? It does not change the textbox value

Answer 1

$('#checkPub').click(function() {
  if($(this).is(':checked')) 
  $("#demo1").val('2020-01-01');
  else
  $("#demo1").val('');
});