How can I send my converted exif coordinates (in decimals) to my db using php and mysql? I'm using one file for this (addnew.php)
I'm sending information through a form in php like:
if(isset($_POST['btn_submit'])){
$username = $_POST['userName'];
$watervisibility = $_POST ['waterVisibility'];
$divinglocation = $_POST['divingLocation'];
$imgFile = $_FILES['user_art']['name'];
$tmp_dir = $_FILES['user_art']['tmp_name'];
$imgSize = $_FILES['user_art']['size'];
I also use libraries to convert exif to decimals ( on change ) to avoid clicking submit. This is all still in the same php file (addnew.php) (this is where i'm having a problem)
var lat;
var latref;
var long;
var longref;
var dec;
var myLatLng;
document.getElementById("input-group").onchange = function(e) {
EXIF.getData(e.target.files[0], function() {
//console.log(EXIF.pretty(this));
long = EXIF.getTag(this, 'GPSLongitude');
longref = EXIF.getTag(this, 'GPSLongitudeRef');
lat = EXIF.getTag(this, 'GPSLatitude');
latref = EXIF.getTag(this, 'GPSLatitudeRef');
dec = dms2dec(long, longref, lat, latref);
console.log("Decimal 1: " + dec[0] + " Decimal 2: " + dec[1]);
console.log("Longref: " + longref);
console.log("Latref: " + latref);
console.log("Long Length: " + long.length);
console.log("Longtitude: " + long);
console.log("Latitude: " + lat);
myLatLng = {lat: dec[1], lng: dec[0]}
myLat = {lat: dec[1]}
myLng = {lng: dec[0]}
console.log(myLat);
console.log(myLng);
});
}
Now I got the decimals and basically just want to send
myLat = {lat: dec[1]}
myLng = {lng: dec[0]}
to my db through php at the same time i'm submitting everything else.
I've tried Send JSON data from Javascript to PHP but I can't seem to get the hang of it
Any ideas?
Thanks!
To send javascript obj to php using json and ajax:
js:
var dataPost = {
"var": "foo"
};
var dataString = JSON.stringify(dataPost);
$.ajax({
url: 'server.php',
data: {myData: dataString},
type: 'POST',
success: function(response) {
alert(response);
}
});
to use that object in php:
$obj = json_decode($_POST["myData"]);
echo $obj->var;
I'm trying to capture audiorecorder (https://github.com/cwilso/AudioRecorder) and send the blob through Ajax a php file, which will receive the blob content and create the file(the wave file in this case).
Ajax call:
audioRecorder.exportWAV(function(blob) {
var url = (window.URL || window.webkitURL).createObjectURL(blob);
console.log(url);
var filename = <?php echo $filename;?>;
$.ajaxFileUpload({
url : "lib/vocal_render.php",
secureuri :false,
dataType : blob.type,
data: blob,
success: function(data, status) {
if(data.status != 'error')
alert("boa!");
}
});
});
and my php file (vocal_render.php):
<?php
if(!empty($_POST)){
$data = implode($_POST); //transforms the char array with the blob url to a string
$fname = "11" . ".wav";
$file = fopen("../ext/wav/testes/" .$fname, 'w');
fwrite($file, $data);
fclose($file);
}?>
P.S:I'm newbie with blobs and ajax.
Thanks in advance.
Try uploading the file as form data
audioRecorder.exportWAV(function(blob) {
var url = (window.URL || window.webkitURL).createObjectURL(blob);
console.log(url);
var filename = <?php echo $filename;?>;
var data = new FormData();
data.append('file', blob);
$.ajax({
url : "lib/vocal_render.php",
type: 'POST',
data: data,
contentType: false,
processData: false,
success: function(data) {
alert("boa!");
},
error: function() {
alert("not so boa!");
}
});
});
.
<?php
if(isset($_FILES['file']) and !$_FILES['file']['error']){
$fname = "11" . ".wav";
move_uploaded_file($_FILES['file']['tmp_name'], "../ext/wav/testes/" . $fname);
}
?>
According to the documentation, by using XMLHttpRequest.send() you can use the Blob object directly.
var blob = new Blob(chunks, { 'type' : 'audio/webm' });
var xhr = new XMLHttpRequest();
xhr.open('POST', '/speech', true);
xhr.onload = function(e) {
console.log('Sent');
};
xhr.send(blob);
I've tried this and it works like a charm.
I have been trying a dozen ways to save a dataurl generated from an svg to my server. This code seems like it should be working based on other threads I've read here but for some reason it just creates a .png file with 0kb. I went ahead and just copy/pasted the dataurl right into my script to avoid any data being sent to php issues right now, I just want to see the php create the image correctly. Here's my code:
$img="data:image/png;base64,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...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";
$filedata = substr($img, strpos($img,",")+1);
file_put_contents("testfile2.png", base64_decode($filedata));
echo "file created";
Here's the jquery code that's generating the data. I just copy it from the alert to test in this script:
$("#testclick").click(function() {
var svg = document.getElementById("map").innerHTML; // or whatever you call it
//alert(svg);
$('#load-target').html(svg);
var canvas = $('#load-target svg')[0];
try {
svgAsDataUri(canvas, null, function(uri) {
var image = new Image();
image.src = uri;
image.onload = function() {
var canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
var context = canvas.getContext('2d');
context.drawImage(image, 0, 0);
var a = document.createElement('a');
a.download = name;
alert(canvas.toDataURL('image/png'));
a.href = canvas.toDataURL('image/png');
document.body.appendChild(a);
a.click();
}
//alert(uri);
$.post("http://www.srqnews.com/maps/create.php",
{
type:"PNG",
datauri:uri
},
function(data,status){
alert("Data: " + data + "\nStatus: " + status);
});
});
} catch(err) {
alert(err.message);
}
});
I'm working on a generative art project where I would like to allow users to save the resulting images from an algorithm. The general idea is:
Create an image on an HTML5 Canvas using a generative algorithm
When the image is completed, allow users to save the canvas as an image file to the server
Allow the user to either download the image or add it to a gallery of pieces of produced using the algorithm.
However, I’m stuck on the second step. After some help from Google, I found this blog post, which seemed to be exactly what I wanted:
Which led to the JavaScript code:
function saveImage() {
var canvasData = canvas.toDataURL("image/png");
var ajax = new XMLHttpRequest();
ajax.open("POST", "testSave.php", false);
ajax.onreadystatechange = function() {
console.log(ajax.responseText);
}
ajax.setRequestHeader("Content-Type", "application/upload");
ajax.send("imgData=" + canvasData);
}
and corresponding PHP (testSave.php):
<?php
if (isset($GLOBALS["HTTP_RAW_POST_DATA"])) {
$imageData = $GLOBALS['HTTP_RAW_POST_DATA'];
$filteredData = substr($imageData, strpos($imageData, ",") + 1);
$unencodedData = base64_decode($filteredData);
$fp = fopen('/path/to/file.png', 'wb');
fwrite($fp, $unencodedData);
fclose($fp);
}
?>
But this doesn’t seem to do anything at all.
More Googling turns up this blog post which is based off of the previous tutorial. Not very different, but perhaps worth a try:
$data = $_POST['imgData'];
$file = "/path/to/file.png";
$uri = substr($data,strpos($data, ",") + 1);
file_put_contents($file, base64_decode($uri));
echo $file;
This one creates a file (yay) but it’s corrupted and doesn’t seem to contain anything. It also appears to be empty (file size of 0).
Is there anything really obvious that I’m doing wrong? The path where I’m storing my file is writable, so that isn’t an issue, but nothing seems to be happening and I’m not really sure how to debug this.
Edit
Following Salvidor Dali’s link I changed the AJAX request to be:
function saveImage() {
var canvasData = canvas.toDataURL("image/png");
var xmlHttpReq = false;
if (window.XMLHttpRequest) {
ajax = new XMLHttpRequest();
}
else if (window.ActiveXObject) {
ajax = new ActiveXObject("Microsoft.XMLHTTP");
}
ajax.open("POST", "testSave.php", false);
ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
ajax.onreadystatechange = function() {
console.log(ajax.responseText);
}
ajax.send("imgData=" + canvasData);
}
And now the image file is created and isn’t empty! It seems as if the content type matters and that changing it to x-www-form-urlencoded allowed the image data to be sent.
The console returns the (rather large) string of base64 code and the datafile is ~140 kB. However, I still can’t open it and it seems to not be formatted as an image.
Here is an example of how to achieve what you need:
Draw something (taken from canvas tutorial)
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
// begin custom shape
context.beginPath();
context.moveTo(170, 80);
context.bezierCurveTo(130, 100, 130, 150, 230, 150);
context.bezierCurveTo(250, 180, 320, 180, 340, 150);
context.bezierCurveTo(420, 150, 420, 120, 390, 100);
context.bezierCurveTo(430, 40, 370, 30, 340, 50);
context.bezierCurveTo(320, 5, 250, 20, 250, 50);
context.bezierCurveTo(200, 5, 150, 20, 170, 80);
// complete custom shape
context.closePath();
context.lineWidth = 5;
context.fillStyle = '#8ED6FF';
context.fill();
context.strokeStyle = 'blue';
context.stroke();
</script>
Convert canvas image to URL format (base64)
// script
var dataURL = canvas.toDataURL();
Send it to your server via Ajax
$.ajax({
type: "POST",
url: "script.php",
data: {
imgBase64: dataURL
}
}).done(function(o) {
console.log('saved');
// If you want the file to be visible in the browser
// - please modify the callback in javascript. All you
// need is to return the url to the file, you just saved
// and than put the image in your browser.
});
Save base64 on your server as an image (here is how to do this in PHP, the same ideas is in every language. Server side in PHP can be found here):
I played with this two weeks ago, it's very simple. The only problem is that all the tutorials just talk about saving the image locally. This is how I did it:
1) I set up a form so I can use a POST method.
2) When the user is done drawing, he can click the "Save" button.
3) When the button is clicked I take the image data and put it into a hidden field. After that I submit the form.
document.getElementById('my_hidden').value = canvas.toDataURL('image/png');
document.forms["form1"].submit();
4) When the form is submited I have this small php script:
<?php
$upload_dir = somehow_get_upload_dir(); //implement this function yourself
$img = $_POST['my_hidden'];
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$data = base64_decode($img);
$file = $upload_dir."image_name.png";
$success = file_put_contents($file, $data);
header('Location: '.$_POST['return_url']);
?>
I think you should convert the image to base64 and then to Blob and send it to the server. When you use base64 images, a lot of lines will be sent to server. With blob, it's only the file.
You can use this code bellow:
function dataURLtoBlob(dataURL) {
let array, binary, i, len;
binary = atob(dataURL.split(',')[1]);
array = [];
i = 0;
len = binary.length;
while (i < len) {
array.push(binary.charCodeAt(i));
i++;
}
return new Blob([new Uint8Array(array)], {
type: 'image/png'
});
};
And canvas code here:
const canvas = document.getElementById('canvas');
const file = dataURLtoBlob( canvas.toDataURL() );
After that you can use ajax with Form:
const fd = new FormData;
fd.append('image', file);
$.ajax({
type: 'POST',
url: '/url-to-save',
data: fd,
processData: false,
contentType: false
});
The code in CoffeeScript syntax:
dataURLtoBlob = (dataURL) ->
# Decode the dataURL
binary = atob(dataURL.split(',')[1])
# Create 8-bit unsigned array
array = []
i = 0
while i < binary.length
array.push binary.charCodeAt(i)
i++
# Return our Blob object
new Blob([ new Uint8Array(array) ], type: 'image/png')
And canvas code here:
canvas = document.getElementById('canvas')
file = dataURLtoBlob(canvas.toDataURL())
After that you can use ajax with Form:
fd = new FormData
# Append our Canvas image file to the form data
fd.append 'image', file
$.ajax
type: 'POST'
url: '/url-to-save'
data: fd
processData: false
contentType: false
Send canvas image to PHP:
var photo = canvas.toDataURL('image/jpeg');
$.ajax({
method: 'POST',
url: 'photo_upload.php',
data: {
photo: photo
}
});
Here's PHP script:
photo_upload.php
<?php
$data = $_POST['photo'];
list($type, $data) = explode(';', $data);
list(, $data) = explode(',', $data);
$data = base64_decode($data);
mkdir($_SERVER['DOCUMENT_ROOT'] . "/photos");
file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/photos/".time().'.png', $data);
die;
?>
I've worked on something similar.
Had to convert canvas Base64-encoded image to Uint8Array Blob.
function b64ToUint8Array(b64Image) {
var img = atob(b64Image.split(',')[1]);
var img_buffer = [];
var i = 0;
while (i < img.length) {
img_buffer.push(img.charCodeAt(i));
i++;
}
return new Uint8Array(img_buffer);
}
var b64Image = canvas.toDataURL('image/jpeg');
var u8Image = b64ToUint8Array(b64Image);
var formData = new FormData();
formData.append("image", new Blob([ u8Image ], {type: "image/jpg"}));
var xhr = new XMLHttpRequest();
xhr.open("POST", "/api/upload", true);
xhr.send(formData);
If you want to save data that is derived from a Javascript canvas.toDataURL() function, you have to convert blanks into plusses. If you do not do that, the decoded data is corrupted:
<?php
$encodedData = str_replace(' ','+',$encodedData);
$decocedData = base64_decode($encodedData);
?>
http://php.net/manual/ro/function.base64-decode.php
In addition to Salvador Dali's answer:
on the server side don't forget that the data comes in base64 string format. It's important because in some programming languages you need to explisitely say that this string should be regarded as bytes not simple Unicode string.
Otherwise decoding won't work: the image will be saved but it will be an unreadable file.
I just made an imageCrop and Upload feature with
https://www.npmjs.com/package/react-image-crop
to get the ImagePreview ( the cropped image rendering in a canvas)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob
canvas.toBlob(function(blob){...}, 'image/jpeg', 0.95);
I prefer sending data in blob with content type image/jpeg rather than toDataURL ( a huge base64 string`
My implementation for uploading to Azure Blob using SAS URL
axios.post(azure_sas_url, image_in_blob, {
headers: {
'x-ms-blob-type': 'BlockBlob',
'Content-Type': 'image/jpeg'
}
})
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');
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)
}
}
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');
});