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

Posted by Rupa Ramraj
Rupa Ramraj
3,089 Points

There is a variable named button in app.js. Set its value to contain a reference to the button element in index.html wit

There is a variable named button in app.js. Set its value to contain a reference to the button element in index.html with the ID of sayPhras

js/app.js 
let button;
let input;


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>

1 Answer

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

You have several equally valid choices to accomplish this task. You can see from the HTML code that he button has an "id" property, so it might be convenient to use the "document.getElementById" method to get the required reference. Another possible method might be to use "document.querySelector", which can work with the id or the tag name.