javascript pick random line from a textarea

I’m trying to get a javascript pick a random line from a textarea. Sorry, big noob here.

Currently my code looks like this, and I’m quite sure there are silly mistakes in it. I’m just kinda stuck. First, how do I connect this function to the textarea? Secondly, how do I even output the result? I think I’ve done too much there with making it two functions. I don’t mind making it smaller somehow.

<body>
<div class="container">
<h3>
    Enter all of the names on a seperate line. <br />
</h3>
<textarea id="textarea" placeholder="Enter names here..."></textarea>   
</div>
<h3>The winner is: <span id = "winner"></span></h3>
<button onclick="randomSelect()">Click me</button>

<script>
function randomSelect() {
    
const lines = input.split('n');
const randomLine = lines[Math.floor(Math.random() * lines.length))];

selectOutput();}
}
function selectOutput() {
document.getElementById("winner").innerHTML = ;
}
</script>
</body>
</html>

Answer

Your codes should look like bellow:

<html>
<body>
<div class="container">
 <h3>
  Enter all of the names on a seperate line. <br />
 </h3>
 <textarea id="textarea" placeholder="Enter names here..."></textarea>   
</div>
<h3>The winner is: <span id = "winner"></span></h3>
<button onclick="randonSelect()">Click me</button>

<script>
 function randonSelect() {
    const input = document.getElementById('textarea').value;
    const lines = input.split('n');
    const randomLine = lines[Math.floor(Math.random() * lines.length)];
    
    //Display your line
    document.getElementById('winner').innerHTML = randomLine;
 }
</script>
 </body>
</html>

You just forgotten to get the element from which you are getting the value. But you did well.