I have this code below which allows me to take notes on a canvas. What I now want to do is when someone hits a submit button, to essentially upload the notes to my database. So i just need a way to read the canvas on the submit button.
<html>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<body>
<canvas id="canvas" width="400" height="400" style="position:absolute;top:10%;left:10%;border:2px solid;"></canvas>
<input type="button" value="Clear" class="canvas-clear" />
</body>
</html>
<script>
$(document).ready(function() {
var flag, dot_flag = false,
prevX, prevY, currX, currY = 0,
color = 'black', thickness = 2;
var $canvas = $('#canvas');
var ctx = $canvas[0].getContext('2d');
$canvas.on('mousemove mousedown mouseup mouseout', function(e) {
prevX = currX;
prevY = currY;
currX = e.clientX - $canvas.offset().left;
currY = e.clientY - $canvas.offset().top;
if (e.type == 'mousedown') {
flag = true;
}
if (e.type == 'mouseup' || e.type == 'mouseout') {
flag = false;
}
if (e.type == 'mousemove') {
if (flag) {
ctx.beginPath();
ctx.moveTo(prevX, prevY);
ctx.lineTo(currX, currY);
ctx.strokeStyle = color;
ctx.lineWidth = thickness;
ctx.stroke();
ctx.closePath();
}
}
});
$('.canvas-clear').on('click', function(e) {
c_width = $canvas.width();
c_height = $canvas.height();
ctx.clearRect(0, 0, c_width, c_height);
$('#canvasimg').hide();
});
});
</script>
I am not sure even where to start or if this is possible, hoping for some help here.