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html2canvas/jsPDF - images not showing when converting html to a pdf

I'm looking to convert some simple HTML into a PDF. It seems the easiest way to do this and keep the css styling is to use the 'html2canvas' js library to convert the html to canvas first, and then create the PDF using jsPDF.
The issue I'm getting is that I have both a background image and inline image in my HTML but neither are showing in the PDF once converted. I've created a Codepen here: https://codepen.io/adamboother/pen/NWGeqom
Here's my js that does the conversion:
function convertToPdf()
{
html2canvas(document.querySelector('#certificate')).then(canvas => {
let pdf = new jsPDF('landscape', 'mm', 'a4');
pdf.addImage(canvas.toDataURL('image/png'), 'PNG', 0, 0, pdf.internal.pageSize.width, pdf.internal.pageSize.height);
pdf.save('certificate.pdf');
});
}
Has anyone found a fix for this?

I am using useCORS: true to your code and it works, assuming your image is in the server. Besides you can follow below code:
function convertToPdf()
{
html2canvas(document.querySelector('#certificate'), {useCORS: true}).then(function(canvas) {
let img = new Image();
img.src = canvas.toDataURL('image/png');
img.onload = function () {
let pdf = new jsPDF('landscape', 'mm', 'a4');
pdf.addImage(img, 0, 0, pdf.internal.pageSize.width, pdf.internal.pageSize.height);
pdf.save('certificate.pdf');
};
});
}

How to convert as pdf while dealing with xml nodes in mxGraph?

I am implementing the graph editor using mxGraph javascript library and able to display the diagram and save the diagram.
Now,I have to export the diagram in to PDF file.
Primary question is,
Is there any other builtin feature is available on mxGraph library itself?
I used mxImageExport() class to exporting PNG image then its is redirecting to null url page.redirect page image
Here is the code:
function convertPDF() {
var graph = universalGraph; // get xml form the graph stored in graph variable
var xmlDoc = mxUtils.createXmlDocument();
var root = xmlDoc.createElement('output');
xmlDoc.appendChild(root);
var xmlCanvas = new mxXmlCanvas2D(root);
var imgExport = new mxImageExport();
imgExport.drawState(graph.getView().getState(graph.model.root), xmlCanvas);
var bounds = graph.getGraphBounds();
var w = Math.ceil(bounds.x + bounds.width);
var h = Math.ceil(bounds.y + bounds.height);
var xml = mxUtils.getXml(root);
new mxXmlRequest('export', 'format=png&w=' + w +
'&h=' + h + '&bg=#F9F7ED&xml=' + encodeURIComponent(xml))
.simulate(document, '_self');
}
(or) else I have to use regular JS PDF library?(I cannot convert the HTML content inside tag in to PDF, While converting it is showing
graph's background only no single shapes are in it. Since it is from XML nodes, I referred the internet and asked me to convert from XML in to SVG then PDF
but this method also not work because I have received the blank PDF file.)
Here is the code:
function savePDF() {
var imgData;
html2canvas($(".svgClass"), {
useCORS: true,
onrendered: function(canvas) {
imgData = canvas.toDataURL(
'image/png');
console.log(imgData);
var doc = new jsPDF('p', 'pt', 'a4');
doc.addImage(imgData, 'PNG', 10, 10);
doc.save('sample-file.pdf');
window.open(imgData);
}
});
}

Save multiple html-pages with jspdf to single pdf

Currently I have a page where user can click-together a report and save this to a pdf with the following code:
document.getElementById('report').onclick = function () {
// Default export is a4 paper, portrait, using milimeters for units
html2canvas(document.body, {
onrendered: function (canvas) {
var img = canvas.toDataURL("image/png");
var doc = new jsPDF();
doc.addImage(img, 'JPEG', 0, 0);
doc.save('test.pdf');
}
});
}
Is it possible that we can do this multiple times and add all pages to one pdf? Finally when the user clicks another button I want to download the pdf with all the added pages.

Html2Canvas only renders viewport

Using html2canvas to try to create pdfs and/or pngs and its working, except it only renders the visible section of the screen.
Anyone have any idea how to fix this?
//create pdf
$(document).ready(function() {
$('#downloadpdf').click(function() {
html2canvas($("#fullreporttoprint"), {
onrendered: function(canvas) {
var imgData = canvas.toDataURL(
'image/png');
var doc = new jsPDF('p', 'mm');
doc.addImage(imgData, 'PNG', 10, 10);
doc.save('mywindassessment.pdf');
}
});
});
});
Before someone marks this, I've checked everywhere online and SO for this problem, and was unable to find a working solution.

How to convert and download chart to pdf?

I m using jsPdf plugin and did this
var data = google.visualization.arrayToDataTable(dataValues,true);
var chart = new google.visualization.CandlestickChart(document.getElementById(id));
google.visualization.events.addListener(chart, 'ready', function () {
var content = '<img src="' + chart.getImageURI() + '">';
$('#graph-images').append(content);
});
function generatePDF() {
var imageTags = $('#graph-images img');
var doc = new jsPDF();
doc.setFontSize(33);
doc.setFillColor(135, 124,45,0);
doc.addImage(imageTags[0], 'png', 10, 10, 150, 100);
doc.save('sample.pdf');
}
by using this i am able to download the pdf file while open that pdf file in adobe reader its saying 110 error.
Can Anybody Help in this, thanks.

You should pass image URI to addImage():
google.charts.setOnLoadCallback(function() {
var data = google.visualization.arrayToDataTable(dataValues, true)
var chart = new google.visualization.CandlestickChart(document.getElementById(id))
chart.draw(data)
imgData = chart.getImageURI()
})
function generatePDF() {
var doc = new jsPDF();
doc.setFontSize(33);
doc.setFillColor(135, 124,45,0);
doc.addImage(imgData, 'png', 10, 10, 150, 100);
doc.save('sample.pdf');
}
Please check this live demo for more details https://jsfiddle.net/p1frmxvp/1/
UPDATE
Turns out the error happens only when we use jspdf 1.3.2 and open the pdf using Adobe Reader as explained here. The only solution so far is either opening the pdf using other viewer (Chrome, Foxit Reader .etc) or downgrading jspdf to 1.2.61. I have updated the jsfiddle above to use the downgraded jspdf.