////testSave.php////////////////
<?php
if (isset($GLOBALS["HTTP_RAW_POST_DATA"]))
{
// Get the data
$imageData=$GLOBALS['HTTP_RAW_POST_DATA'];
// Remove the headers (data:,) part.
// A real application should use them according to needs such as to check image type
$filteredData=substr($imageData, strpos($imageData, ",")+1);
// Need to decode before saving since the data we received is already base64 encoded
$unencodedData=base64_decode($filteredData);
//echo "unencodedData".$unencodedData;
//=============
$limit = 4;
$digit_str = '0123456789';
$digit = substr(str_shuffle($digit_str), 0, $limit);
//======================
$letter_str='abcdefhigklmnopqrstuvwxyz';
$letter = substr(str_shuffle($letter_str), 0, $limit);
//==================
$filename="CANVAS$digit$letter.png";
echo $filename;
// Save file. This example uses a hard coded filename for testing,
// but a real application can specify filename in POST variable
// $fp = fopen( 'test.png', 'wb' );
$fp = fopen( $filename, 'wb' );
fwrite( $fp, $unencodedData);
fclose( $fp );
}
?>
<!DOCTYPE html>
<html>
<head>
<title>
How To Save HTML5 Canvas Into File
</title>
<meta name="Keywords" content="html, html5, javascript canvas tutorial, javascript canvas, todataurl, saving, web development, ajax" />
<meta name="Description" content="html 5, html5, javascript canvas tutorial for web development, saving canvas" />
<script type="text/javascript">
//****************************************************************
// Example function save save canvas content into image file.
// www.permadi.com
//****************************************************************
function saveViaAJAX()
{
var testCanvas = document.getElementById("testCanvas");
var canvasData = testCanvas.toDataURL("image/png");
var postData = "canvasData="+canvasData;
var debugConsole= document.getElementById("debugConsole");
debugConsole.value=canvasData;
//alert("canvasData ="+canvasData );
var ajax = new XMLHttpRequest();
ajax.open("POST",'testSave.php',true);
ajax.setRequestHeader('Content-Type', 'canvas/upload');
//ajax.setRequestHeader('Content-TypeLength', postData.length);
ajax.onreadystatechange=function()
{
if (ajax.readyState == 4)
{
alert(ajax.responseText);
// Write out the filename.
document.getElementById("debugFilenameConsole").innerHTML="Saved as<br><a target='_blank' href='"+ajax.responseText+"'>"+ajax.responseText+"</a><br>Reload this page to generate new image or click the filename to open the image file.";
}
}
ajax.send(postData);
}
</script>
</head>
<body>
<div>
<canvas id="testCanvas" width="300" height="300"></canvas>
</div>
<div>
<textarea id="debugConsole" rows="10" cols="60">Data</textarea>
<p><button onclick="saveViaAJAX();">Save Via AJAX</button> <p>
<div id="debugFilenameConsole">Wait for a while after clicking the button and the filename of the image will be shown to you. </div>
</div>
<script type="text/javascript">
// This portion of the code simply draws random circles into the canvas (it has nothing todo with saving the canvas).
var canvas = document.getElementById("testCanvas");
if (canvas.getContext)
{
var canvasContext = canvas.getContext("2d");
for (i=0; i<150; i++)
{
canvasContext.fillStyle="rgb("+(parseInt(Math.random()*255))+","+(parseInt(Math.random()*255))+","+(parseInt(Math.random()*255))+")";
canvasContext.beginPath();
canvasContext.arc(Math.random()*350,Math.random()*350,Math.random()*20, 0,Math.PI*2,true);
canvasContext.fill();
}
}
</script>
</body>
</html>
