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JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM Selecting by Id

Charlie lol
Charlie lol
8,963 Points

Why does this give undefined error? const button = document.getElementByID('sayPhrase');

The error correcting on this site is a bit strange, clues would be a good idea

js/app.js
const button = document.getElementByID('sayPhrase');
const input = document.getElementByID('phraseText');

button.addEventListener('click', () => {
  alert(input.value);
});
index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Phrase Sayer</title>
  </head>
  <body>
    <p><input type="text" id="phraseText"></p>
    <p><button id="sayPhrase">Say Phrase</button></p>
    <script src="js/app.js"></script>
  </body>
</html>

2 Answers

you need to include the script for jQuery - something like this <script src="js/jquery-1.11.2.min.js"></script>

next, the getElementByID, should be getElementById

This isn't using any jQuery, but the second part is correct.

Yes indeed just the second part,