$(document).on('keyup','.input-text input',function (e) { code example

Example 1: check when keyup an input from a specific form jquery

var inputs = $('#formID').find('input[type="text"]');
inputs.keyup(function() {
   console.log($(this));
});

Example 2: javascript on keypu

<input type="text" onkeyup="myFunction()">