How to track the event of adding text to input?

Question

JavaScript

I create a form, it is necessary that when entering text in the input, the function works, it is when entering, when deleting the text, no actions should occur. How can this be implemented? Thank you in advance.

Answer 1

like this, in principle, to increase the number of characters

var start_length = $( ".target" ).val().length;
$( ".target" ).keyup(function() {
  if($( ".target" ).val().length > start_lenght) {
     start_length = $( ".target" ).val().length;
     alert('добавлен текст');
  }
});

Answer 2

no action should be taken when deleting text

that is, you can’t delete the text at all, or how is it?

Answer 3

Maybe try this:

$( ".target" ).change(function() {
  //
});

You can read here: https://ruseller.com/jquery.php?id=154