Menu
I have a canvas element on my page. I draw an image over it and some data that the user entered. On a press of a button I want to send the canvas to printer, to print it on paper. I tried to use this plug-in: jQuery.printElement, like that:
the button code:
<a href="javascript:print_voucher()">PRINT</a>
'print_voucher()' function:
function print_voucher()
{
$("#canvas_voucher").printElement();
}
canvas_voucher is the ID of my canvas element. It printed the page, but didn't print the canvas. I tried to use it like that as well:
$("#canvas_voucher img").printElement();
But that didn't even start the printer.
So how can I do that? How can I print the content of the canvas?
**EDIT** Here's the code that creates my canvas and tries to create an image with it:
function create_voucher(visitor_name, visitor_identity_num, unique_number)
{
var canvas = $("#canvas_voucher")[0];
if (canvas.getContext)
{
var ctx = canvas.getContext('2d');
// Draw image
var img = new Image();
img.src = 'https://someurl.com/image.jpg';
img.onload = function(){
ctx.drawImage(img,0,0);
ctx.fillStyle="#CCC";
ctx.font="bold 20px Arial";
ctx.fillText(visitor_name, 750, 270);
ctx.fillText(visitor_identity_num, 750, 295);
ctx.font="bold 25px Arial";
ctx.fillText(unique_number, 620, 325);
}
var voucher = canvas.toDataURL("image/png");
$("#voucher_img").attr("src", voucher);
} else {
alert('You need Safari or Firefox 1.5+ to see this.');
}
}
487
This will convert the canvas to a .png image URL and open it in a new browser window
The Print Dialog is triggered to let the user print the page.
function print_voucher(){
var win=window.open();
win.document.write("<br><img src='"+canvas.toDataURL()+"'/>");
win.print();
win.location.reload();
}
Here is example code:
<style>
body{ background-color: ivory; }
canvas{border:1px solid red;}
</style>
<script>
$(function(){
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
ctx.fillStyle="gold";
ctx.strokeStyle="blue";
ctx.lineWidth=5;
ctx.rect(50,50,100,100);
ctx.fill();
ctx.stroke();
function print_voucher(){
var win=window.open();
win.document.write("<br><img src='"+canvas.toDataURL()+"'/>");
win.print();
win.location.reload();
}
$("#printVoucher").click(function(){ print_voucher(); });
}); // end $(function(){});
</script>
</head>
<body>
<canvas id="canvas" width=300 height=300></canvas><br>
<button id="printVoucher">Print</button>
</body>
</html>
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
