Multi tool use

Clash Royale CLAN TAG

chessboard canvas , loop and get some checkers as a circles in JS canvas

I am struggling how to create multiple checkers on the checkerboard
I have this JS code so far:

<script>
$(document).ready(function() {
var gColor = "black";
var c = $("#myCanvas")[0];
var ctx = c.getContext("2d");

ctx.lineWidth = 2;
ctx.strokeStyle = "black"; //set the color, gradient, or pattern for stroke

drawBoard();
$("#color").click(function () {
gColor = $("#color").val();
if (gColor > "")
drawBoard();
});

function drawBoard() {
var x, y, step = 60, step2 = 120;
ctx.rect(0,0,480,480);
ctx.stroke();
ctx.save();

for (var k=0; k<2; k++) {
step2 -= step;
ctx.translate(0, step*k);
console.log("translate:("+0+","+step*k+")");
for (var y=0; y<4; y++) {
for (var i=0; i<4; i++) {
x = i * 2 * step + step2;
ctx.fillStyle = gColor;
ctx.fillRect(x,y*step*2,step,step);
console.log("fillRect: "+x+","+y*step*2+","+step+","+step+","+gColor);
}
}
}
ctx.restore();
}

var c = $("#myCanvas")[0];
var ctx = c.getContext("2d");

var rad = 90;
for (var i=0; i<1; i++) {
switch (i) {
case 0: ctx.fillStyle = "red";
break;
}
ctx.beginPath();

// Draw circle (x, y, radius, starting angle, ending angle in radian)
ctx.arc(30, 30, 30, 0, 2 * Math.PI);
ctx.fill();
ctx.stroke();

}

});

</script>


I have this output :

But need something like this:

I understand that I need to do some sort of looping, but because I am just learning canvas I don't know where to start. Any help or advice appreciated

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