how to assign value to input field in jquery code example

Example 1: jquery change value of input

$('selector').val('new value');

Example 2: jquery set input value

$("button").click(function(){
  $("input:text").val("Glenn Quagmire");
 })

Example 3: javascript change input value jquery

$('#IdOfTheField').on('change', function() {
  alert( this.value );
});