John Davidson

Message:

I'm creating an image editing application, I want to generate a pdf from fabric JavaScript linked HTML canvas, I can also use PHP, the approach inside my mind is, exporting as a JSON and taking from PHP then converting to PDF, but I'm not able to export JSON from canvas right now, can anybody guide me ?

---

My Answer:
To export fabric canvas objects to PDF, you can follow these steps:

1. Export canvas objects as JSON:
You can use the `toJSON()` method provided by Fabric.js to export canvas objects as JSON. Here's an example code snippet:

javascript
var canvas = new fabric.Canvas('canvas');

// Add objects to canvas

var json = JSON.stringify(canvas.toJSON());


2. Send JSON data to PHP:
You can send the JSON data to PHP using AJAX or form submission. Here's an example using AJAX:

javascript
$.ajax({
type: 'POST',
url: 'export.php',
data: { json: json },
success: function(response) {
console.log('JSON data sent to PHP');
}
});


3. Convert JSON to PDF in PHP:
In your PHP script (export.php), you can decode the JSON data and convert it to a PDF using a library like TCPDF or FPDF. Here's an example using TCPDF:

php
require_once('tcpdf/tcpdf.php');

$json = $_POST['json'];
$data = json_decode($json, true);

$pdf = new TCPDF();
$pdf->AddPage();

// Loop through the JSON data and add objects to PDF

$pdf->Output('canvas.pdf', 'D');
?>


4. Download the PDF:
Once the PDF is generated, you can prompt the user to download it using the `header()` function in PHP:

php
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="canvas.pdf"');
readfile('canvas.pdf');


By following these steps, you should be able to export fabric canvas objects to PDF using JavaScript and PHP.