How to get the choice(value) out of datalist in javascript?

I am developing a probability calculator and I can't manage to get the 'value' out of the datalist. I'm very new to javascript so maybe it's very easy but I don't know how to do it yet.

I tried using object.value but it does not seem to work. Do you have any ideas?

Here's my javascript code:

//test
let test = document.getElementById("name");
test.addEventListener("input", () => console.log(test.value));

// variables
let q = document.getElementById("submit");
let q1 = document.getElementById("q1");

q.addEventListener('click', () => console.log("works"));
q.addEventListener('click', probability_calculation()));

function probability_calculation() {
  if (q1.value === 'Rap') {
    alert("works");
    console.log("works well");
  } else if (q1.value === 'Alter') {
    console.log('33%');
  } else if (q1.value === 'Pop') {
    console.log('97%');
  }
}

<h1 class="header">Probability Calculator</h1>
<div>
  <input type="text" placeholder="Enter your name" id="name">
  <input list="q1" placeholder="What is your favourite type of music?">
</div>
<panel class="center-q">
  <datalist id="q1">
            <option>Rap</option>
            <option>Alter</option>
            <option>Pop</option>
        </datalist>
</panel>
<input type="submit" id="submit">

Solution

In this line

q.addEventListener('click', probability_calculation()));

You have an extra closing parentheses character
You should not call probability_calculation function but just pass it itself as a callback handler to event listener

The correct version is

q.addEventListener('click', probability_calculation);

Also, you have two tags with the same identifier q1.

I simplified your datalist stuff to simple select in order to show the working version.

See jsfiddle