Send canvas image and form data to server to name png - php

Question

Hi I need to get the form data to be submitted along with the canvas image. Then use that form data to name the file saving on the server. I am just getting to grips with PHP, so any help would be amazing.
This is my working example which will save the same named file to the server.
HTML
<form action="name.php" method="post">
Name: <input type="text" name="fname">
Age: <input type="text" name="age">
<input type="button" onclick="saveImage();formSubmit();" value="Submit form">
</form>
JS
function saveImage(){
var xmlhttp;
xmlhttp=((window.XMLHttpRequest)?new XMLHttpRequest():new ActiveXObject("Microsoft.XMLHTTP"));
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
//do something with the response
}
}
xmlhttp.open("POST","upload.php",true);
var oldCanvas = document.getElementById('colors_sketch').toDataURL("image/png");
var img = new Image();
img.src = oldCanvas;
xmlhttp.setRequestHeader("Content-type", "application/upload")
xmlhttp.send(oldCanvas);
}
PHP
$data = file_get_contents('php://input');
$canvasImg = imagecreatefrompng($data);
$width = imagesx($canvasImg);
$height = imagesy($canvasImg);
$outImg = imagecreatetruecolor($width, $height);
$color = imagecolorallocatealpha($outImg, 255, 255, 255, 127);
imagefill($outImg, 0, 0, $color);
imagecopy($outImg, $canvasImg, 0, 0, 0, 0, $width, $height);
imagepng($outImg, 'test.png');

Answer 1

Here are steps to send your form and image to upload.php
First create a data package to send that includes your serialized image and form. Here I use jquery to serialize your form (or serialize it yourself without jquery).
// serialize and concatenate both form and canvas image
var package=$("form").serialize() + "&imageDataURL="+canvas.toDataURL();
Then POST it with AJAX to your PHP server:
// ajax it
postImagePlusForm();
function postImagePlusForm(){
$.ajax({
type: "POST",
url: "upload.php",
data: package,
success: function(value) {
// ...we have success!
}
});
}
And finally catch it and process it in php:
<?php
if ( isset($_POST["imageDataURL"]) && !empty($_POST["imageDataURL"]) ) {
// create $dataURL
$dataURL = $_POST["imageDataURL"];
// Extract base64 data
// we have an unneeded header, zap it
$parts = explode(',', $dataURL);
$data = $parts[1];
// Decode
$data = base64_decode($data);
// Save
$fp = fopen('newImage.png', 'w');
fwrite($fp, $data);
fclose($fp);
}
if ( isset($_POST["formData"]) && !empty($_POST["formData"]) ) {
$formData = $_POST['formData'];
foreach ($formValue as $x) {
// do whatever you need to do with each form value ($x)
}
}

Answer 2

This question was asked numerous times on SO.
I already answered the same question here:
https://stackoverflow.com/a/13198699/1090562
In short, this can be achieved with this, for more details - read the link
$.ajax({
type: "POST",
url: "script.php",
data: {
imgBase64: canvas.toDataURL();
}
}).done(function(o) {
console.log('saved');
});