Is there a way to transform an HTML canvas into a tangible photograph?

Question

Is there a way to transform an HTML canvas into a tangible photograph?

I am currently working on converting HTML content into a real image on the client's side. After conducting research on canvas2base64, canvas2base64, and html2base64 on Stack Overflow, I have found that the generated images are always based on base64 code rather than a real picture.

While the quality of the generated image is satisfactory, I am facing an issue when trying to insert it into a PDF using jsPDF as it does not support base64 images.

My current setup includes using jquery.js, jspdf.js, html2canvas.js, and FileSaver.js.

I am looking for a solution to generate a genuine image in formats such as .png or .jpg from a canvas without relying on base64 code. Ideally, I would like to save this image in the user's localStorage for easy reference and use in my code.

The following code aims to generate an image and insert it into a PDF with the dimensions of a DIN A4 sheet:

function print() {
//const filename  = 'Loveletter_.pdf';

html2canvas(document.querySelector('.finishedLetter')).then(function(canvas) {
var pdf = new jsPDF('p', 'mm', 'a4');
$("#test_me").attr("src", canvas.toDataURL("image/png", 1.0));
var ImgForPDF = document.getElementById('test_me').getAttribute('src');
pdf.addImage(ImgForPDF, 'PNG', 0, 0, 211, 298);
});
pdf.save('Loveletter_.pdf');
}

javascript jquery html css jspdf

Answer 1

Answer №1

Thank you for the confirmation. I recommend you try the following method to create a printable PDF file without affecting your css properties:

function print() {


// Utilizing HTML2Canvas to generate PDF
  html2canvas(document.body,{
    useCORS: true, 
    onrendered:function(canvas){
      var img=canvas.toDataURL("image/png");
      var imgData = canvas.toDataURL('image/png');
      var imgWidth = 210;
      var pageHeight = 295;
      var imgHeight = canvas.height * imgWidth / canvas.width;
      var heightLeft = imgHeight;

      var doc = new jsPDF('p', 'mm');
      var position = 0;

      doc.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
      heightLeft -= pageHeight;

      while (heightLeft >= 0) {
        position = heightLeft - imgHeight;
        doc.addPage();
        doc.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
        heightLeft -= pageHeight;
      }
      doc.save('myDoc.pdf');
    }
  });

}

Answer 2

Thank you for the confirmation. I recommend you try the following method to create a printable PDF file without affecting your css properties:

function print() {


// Utilizing HTML2Canvas to generate PDF
  html2canvas(document.body,{
    useCORS: true, 
    onrendered:function(canvas){
      var img=canvas.toDataURL("image/png");
      var imgData = canvas.toDataURL('image/png');
      var imgWidth = 210;
      var pageHeight = 295;
      var imgHeight = canvas.height * imgWidth / canvas.width;
      var heightLeft = imgHeight;

      var doc = new jsPDF('p', 'mm');
      var position = 0;

      doc.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
      heightLeft -= pageHeight;

      while (heightLeft >= 0) {
        position = heightLeft - imgHeight;
        doc.addPage();
        doc.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
        heightLeft -= pageHeight;
      }
      doc.save('myDoc.pdf');
    }
  });

}

Answer 3

Answer №2

It's great to hear that the solution is working well for you. Don't forget to up-vote the answer that helped resolve your issues. If you're looking to capture only specific div elements in your PDF, you can follow this technique:

 $(document).on('click', '#download_button', function(){

  // Adjusting settings before generating the PDF
  $('header').hide();
  $('footer').hide();

  // Using HTML2Canvas to create the PDF

  html2canvas(document.body,{
   //Insert your code here
  });

  // Restoring properties to their original state after PDF generation
  $('header').show();
  $('footer').show();

});

Answer 4

It's great to hear that the solution is working well for you. Don't forget to up-vote the answer that helped resolve your issues. If you're looking to capture only specific div elements in your PDF, you can follow this technique:

 $(document).on('click', '#download_button', function(){

  // Adjusting settings before generating the PDF
  $('header').hide();
  $('footer').hide();

  // Using HTML2Canvas to create the PDF

  html2canvas(document.body,{
   //Insert your code here
  });

  // Restoring properties to their original state after PDF generation
  $('header').show();
  $('footer').show();

});

Is there a way to transform an HTML canvas into a tangible photograph?

Answer №1

Answer №2

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