Trouble with "addeventlistener" and getting statement "if statement" to run - onclicklistener

Question

I'm trying to get my game to run based on the click of a button. Please bear with me! I'm new to coding. I want when a button is clicked, to assign a variable to that button.
To recap:
I have 3 buttons for a player to choose from, essentially rock, paper scissors.
-the player clicks a button and it is automatically played against a randomly computer generated number
-I cannot get from the button click to assigning a value to the player's choice variable.
//calls game variables
const gameChoices = ["Scalpellus","Papyrus","Lapis"];
let playerChoice = null;
let computerChoice = null;
// The computer random choice.
function computerChooses(){
const randomChoiceComputer = Math.floor(Math.random() * gameChoices.length);
//the computer chooses their "weapon" & updates computer function
CompRandoChoice = gameChoices[randomChoiceComputer];
return CompRandoChoice;
}
// Player chooses by clicking a button
// Defining variables for event listening, gets the button Id from HTML, calls the function for the computer's randomly generated choice
const scalpellusButton = document.getElementById("scalpellus").addEventListener("click", computerChooses);
const papyrusButton = document.getElementById("papyrus").addEventListener("click", computerChooses);
const lapisButton = document.getElementById("lapis").addEventListener("click", computerChooses);
// if statement to stores the choice from the button that was clicked
if (scalpellusButton === true) {
playerChoice = gameChoices[0];
}
else if (papyrusButton === true) {
playerChoice = gameChoices[1];
}
else {
playerChoice = gameChoices[2];
}