I keep getting the uncaught syntaxerror: unexpected identifier while I try writing HTML code in chrome

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Im trying to learn coding in Chrome and when i try to run the code i've written it gives the Uncaught SyntaxError: Unexpected identifier error
This is the Code i've written:

<html>

<canvas id="gameCanvas" width="800" height="600"></canvas>

<script>
var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 10;
var ballSpeedY = 4;

var paddle1Y = 250;
const PADDLE_HEIGHT = 100;

function calculateMousePos(evt) {
		var rect = canvas.getBoundingClientRect();
		var root = document.documentElement;
		var mouseX = evt.clientX - rect.left - root.scrollLeft;
		var mouseY = evt.clientY - rect.top - root.scrollTop
		return {
				x:mouseX
				y:mouseY
		};
}

window.onload = function() {
        canvas = document.getElementById('gameCanvas');
		canvasContext = canvas.getContext('2d');
		
		var framesPerSecond = 30;
		setInterval(function() {
				moveEverything();
				drawEverything();
		}, 1000/framesPerSecond ); 
		
		canvas.addEventListener('mousemove',
				function(evt) {
						var mousePos = calculateMousePos(evt);
						paddle1Y = mousePos.y-(PADDLE_HEIGHT/2);
				});
}

function moveEverything() {
		ballX = ballX + ballSpeedX;
		ballY = ballY + ballSpeedY;
		if(ballX < 0) {
				ballSpeedX = -ballSpeedX;
		}
		if(ballX > canvas.width) {
				ballSpeedX = -ballSpeedX;
		}		
		if(ballY < 0) {
				ballSpeedY = -ballSpeedY;
		}
		if(ballY > canvas.height) {
				ballSpeedY = -ballSpeedY;
		}
}

function drawEverything() {
		// next line blanks out the screen with black 
		colorRect(0,0,canvas.width,canvas.height,'black');
		
		// this is left player paddle
		colorRect(0,paddle1Y,10,PADDLE_HEIGHT,'white');
		
		// next line draws the ball
		colorCircle(ballX, ballY, 10, 'white');

function colorCircle(centerX, centerY, radius, drawColor) {
		canvasContext.fillStyle = "drawColor";
		canvasContext.beginPath();
		canvasContext.arc(centerX, centerY, radius, 0,Math.PI*2, true);
		canvasContext.fill();
} 
} 
 
 function colorRect(leftX,toyY, width,height, drawColor) {
		canvasContext.fillStyle = drawColor;
		canvasContext.fillRect(leftX,toyY, width,height);
 }
</script>

</html>

What I have tried:

I've looked through the whole code and cannot find how to fix this at all.

Posted 13-Jan-22 20:37pm

Member 15499645

Updated 13-Jan-22 22:48pm

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Comments

Richard MacCutchan 14-Jan-22 3:00am

Which line does the error message occur on?

Maybe it's the double close brace just before function colorRect

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Chris Copeland · Answer 1 · 2022-01-13T22:48:00

Solution 1

The issue lies here:

JavaScript

return {
        x:mouseX <--
        y:mouseY
};

Between properties you need to provide a comma. I'm surprised that JS complained about the issue being much further down in the code to be honest.

JavaScript

return {
        x:mouseX,
        y:mouseY
};

Posted 13-Jan-22 22:48pm

Chris Copeland