display result in textbox javascript code example

Example: How to display output in textbox in JavaScript

<!DOCTYPE html>
<html lang = "en-US">
 <head>
 <meta charset = "UTF-8">
 <title>textBoxes.html</title>
 <script type = "text/javascript">
  // from textBoxes.html
  function sayHi(){
  var txtName = document.getElementById("txtName");
  var txtOutput = document.getElementById("txtOutput");
  var name = txtName.value;
  txtOutput.value = "Hi there, " + name + "!"
  } // end sayHi
 </script>
 <link rel = "stylesheet"
   type = "text/css"
   href = "textBoxes.css" />
 </head>
 <body>
 <h1>Text Box Input and Output</h1>
 <form action = ">
  <fieldset>
  <label>Type your name: </label>
  <input type = "text"
    id = "txtName" />
  <input type = "button"
    value = "click me"
    onclick = "sayHi()"/>
  <input type = "text"
    id = "txtOutput" />
  </fieldset>
 </form>
 </body>
</html>