I'm trying to put the image file "sticky.png" into a canvas box, but all I'm getting is a blank canvas. Can anyone point out what I'm doing wrong and/or give me code that works?
<canvas id="myCanvas" width="200" height="100"
style="border:1px solid #000000;">
</canvas>
<body>
<script>
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
var sticky = new Image();
sticky.onload = function() {
context.drawImage(sticky, 0, 0);
sticky.src = "sticky.png";
};
</script>
</body>
I'm trying to put the image file "sticky.png" into a canvas box, but all I'm getting is a blank canvas. Can anyone point out what I'm doing wrong and/or give me code that works?
<canvas id="myCanvas" width="200" height="100"
style="border:1px solid #000000;">
</canvas>
<body>
<script>
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
var sticky = new Image();
sticky.onload = function() {
context.drawImage(sticky, 0, 0);
sticky.src = "sticky.png";
};
</script>
</body>
- Draw it after the image has loaded. See here html5canvastutorials./tutorials/html5-canvas-images – elclanrs Commented Oct 3, 2014 at 20:34
- Thank you! that was exactly what I was doing wrong. This is resolved now. – user3150635 Commented Oct 3, 2014 at 20:45
2 Answers
Reset to default 5You need to include the sticky.src before sticky.onload.
<body>
<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
var sticky = new Image();
sticky.src = "sticky.png";
sticky.onload = function() {
context.drawImage(sticky, 0, 0);
};
</script>
</body>
Fiddle
sometimes as a workAround we have to load the image before the canvas. It's very unusual, but it WORKS. And then you just hide the image. Don't forget to use setTimeOut to wait till image is loaded!
setTimeout("paintStar()", 2000);
function paintStar() {
var canva3 = document.getElementById('canvas3');
canva3.width = 640;
canva3.height = 480;
var ct3 = canva3.getContext('2d');
var img = new Image();
img.src = 'https://encrypted-tbn0.gstatic./images?q=tbn:ANd9GcQ3DlDGTyfaFMtUf9GYykLglqfS8GzHbeKRV5vDfHraV1ihNIYo';
ct3.drawImage(img, 0, 0);
ct3.drawImage(img, 0, 0, 20, 20, 10, 200, 20, 20);
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CANVAS</title>
<style>
.canvas-1 {
width: 640px;
height: 480px;
border: 1px solid #777;
}
.img-1 {
display: none;
}
</style>
<script src="canva3.js" defer></script>
</head>
<body>
<div class="img-1"><img src="https://encrypted-tbn0.gstatic./images?q=tbn:ANd9GcQ3DlDGTyfaFMtUf9GYykLglqfS8GzHbeKRV5vDfHraV1ihNIYo" alt=""></div>
<canvas id="canvas3" style="border: 2px solid #444;">Doesn't work!</canvas>
</body>
</html>