Draw a grid on an HTML 5 canvas element

Question

I've been searching everywhere and couldn't find how to draw a grid on an HTML5 Canvas. I'm new to HTML5 and canvas.

I know how to draw shapes but this drawing grid is taking forever to understand.

Can someone help me on this?

Answer 1

The answer is taken from here Grid drawn using a <canvas> element looking stretched

Just edited it a little, hope it helps

// Box width
var bw = 400;
// Box height
var bh = 400;
// Padding
var p = 10;

var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
function drawBoard(){
    for (var x = 0; x <= bw; x += 40) {
        context.moveTo(0.5 + x + p, p);
        context.lineTo(0.5 + x + p, bh + p);
    }

    for (var x = 0; x <= bh; x += 40) {
        context.moveTo(p, 0.5 + x + p);
        context.lineTo(bw + p, 0.5 + x + p);
    }
    context.strokeStyle = "black";
    context.stroke();
}

drawBoard();

body {
    background: lightblue;
}
#canvas {
    background: #fff;
    margin: 20px;
}

<div>
    <canvas id="canvas" width="420px" height="420px"></canvas>
</div>