I'm trying to capture HTML to image in an Ionic 4 app.
I tried using html2canvas, however, it doesn't work and shows this output in the console:
This is my code:
var element = document.getElementById('capture');
html2canvas(element).then(canvas => {
var imgData = canvas.toDataURL("image/png");
this.socialSharing.share(null, null, imgData);
});
I'm having the same issue. I managed to "fix" it by putting my code out of the <ion-content> tag. My guess is that html2canvas doesn't render shadow DOM elements (which is the case of <ion-content>, as of Ionic 4).
For instance this outputs an empty canvas:
<ion-content>
<div id="capture">
<h1>Test</h1>
</div>
</ion-content>
But the following works:
<div id="capture">
<h1>Test</h1>
</div>
This is not really a solution, but it's good enough for my use...
I was trying this component too but it does not work. The solution I found was to use the dom-to-image library. I attached an example of what I did. You just have to put the file extension you want to convert.
https://www.npmjs.com/package/jspdf
https://www.npmjs.com/package/dom-to-image
import * as jsPDF from 'jspdf';
import domtoimage from 'dom-to-image';
exportPdf(){
const div = document.getElementById('pdf');
const options = { background: 'white', height: 845, width: 595 };
domtoimage.toPng(div, options).then((dataUrl) => {
//Initialize JSPDF
const doc = new jsPDF('p', 'mm', 'a4');
//Add image Url to PDF
doc.addImage(dataUrl, 'PNG', 0, 0, 210, 340);
doc.save('pdfDocument.pdf');
}
}
The latest html2canvas supports shadow dom, like https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js
Related
I want to print some HTML to an PDF and am using a combination of html2Canvas and jsPDF to achieve that.
It all works just fine, however, the image quality is quite poor and doesn't look very sharp.
I've done some research but haven't found a solution that actually improves the quality of the image. Any suggestions would be well appreciated.
function printPDF() {
const domElement = document.getElementById("print-pdf");
html2canvas(domElement, {
onclone: (document) => {
document.getElementById("print-button");
},
}).then((canvas) => {
const imgData = canvas.toDataURL("image.png", 1.0);
const doc = new jsPDF();
doc.addImage(imgData, "JPEG", 5, 5);
doc.save(`${leadData.company}-Timo-Huennebeck-Cover-Letter`);
});
}
Im trying to create a pdf based on a html, which has 3 images. The html can be seen and there is a button that downloads the html as a pdf file, but only the first image is shown on the downloaded pdf. This is the function that downloads the file (im using jsPDF library):
const savePDF = () => {
const doc = new jsPDF('p', 'pt', 'a4');
const margin = 10;
const certificate = document.querySelector('#doc');
const scale = (doc.internal.pageSize.width - margin * 2) / certificate.offsetWidth;
doc.internal.write(0, 'Tw');
doc.html(certificate, {
x: margin,
y: margin,
html2canvas: {
scale: scale
},
callback: function(doc) {
doc.output('save', {filename: 'pdfFile.pdf'});
}
})
}
Everything else is allright, the text, the tables and the first image of the doc. But for some reason the second and third image arent shown on the downloaded pdf file. I get console message: "Error loading image". All these images are on the public folder of the project, locally. Im working on NextJS.
Btw, all images are set the same way:
<Image src='/image1.png' alt='' width={500} height={500}/>
I'm trying to embedd an image into a PDF with jsPDF. For some reason this is not working . This is the Code when I create my PDF:
exportPDF () {
const doc = new jsPDF('p', 'pt')
var footer = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAC...'
var header = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgA...'
/* Some other stuff */
doc.addImage(this.output, 'PNG', 400, 400, 500, 500) #This does not work
doc.addImage(header, 'PNG', 0, 0, 600, 139.86) #For some reason these images work
doc.addImage(footer, 'PNG', 0, 800, 600, 54.68)
/* Some other stuff */
doc.save('Containertreppen Teileliste.pdf')
}
The Variable output is passed from another page and therefore not created in the method (I'm using vuejs). In this Variable the Screenshot of a Babylonjs Scene is stored, encoded in base64.
This is the Code when a take the Screenshot:
printDiv() {
this.scene.render();
const self = this
const options = {
type: "dataURL",
};
this.$html2canvas(document.getElementById("renderCanvas"), options).then(function(canvas){
self.output = canvas
})
},
I'm able to display the screenshot in an HTML-element and I can download it as a normal png but for some reason when I try to add it to my PDF the following error occurs in my console:
Error in v-on handler: "Error: Supplied Data is not a valid base64-String jsPDF.convertStringToImageData"
I also tried to put the String as src for an HTML-image-element but it changed nothing.
This is the beginning of the Variable output:
"data:image/png;base64,iVBORw..."
Can someone help me with this?
I am exporting the content on the webpage to the PDF file, for this i have used jsPDF API and i could able to get it work but now i want to use html2PDF as it resolves few issues which were faced when using jsPDF API.
I have written the function $scope.exportUsingJSPDF which is called when the button Export Using JSPDF is clicked. Similarly i want to implement the function $scope.exportUsingHTML2PDF which uses html2PDF API but could not succeed. Any inputs on how to modify $scope.exportUsingHTML2PDF so that it iterates the divs and shows the div content as shown when invoked using $scope.exportUsingJSPDF by clicking Export using JSPDF API.
Complete online example: https://plnkr.co/edit/454HUFF3rmLlkXLCQkbx?p=preview
js code:
//trying to implement the below function same as $scope.exportUsingJSPDF, so
// that when user click on Export using HTML2PDF button, it exports the content to the PDF and generaes the PDF.
$scope.exportUsingHTML2PDF = function(){
var pdf = new jsPDF('l', 'pt', 'a4');
var pdfName = 'test.pdf';
pdf.canvas.height = 72 * 11;
pdf.canvas.width = 72 * 8.5;
html2pdf(document.getElementByClassName("myDivClass"), pdf, function(pdf){
pdf.save(pdfName);
});
}
$scope.exportUsingJSPDF = function() {
var pdf = new jsPDF('p','pt','a4');
var pdfName = 'test.pdf';
var options = { pagesplit: true};
var $divs = $('.myDivClass') //jQuery object of all the myDivClass divs
var numRecursionsNeeded = $divs.length -1; //the number of times we need to call addHtml (once per div)
var currentRecursion=0;
//Found a trick for using addHtml more than once per pdf. Call addHtml in the callback function of addHtml recursively.
function recursiveAddHtmlAndSave(currentRecursion, totalRecursions){
//Once we have done all the divs save the pdf
if(currentRecursion==totalRecursions){
pdf.save(pdfName);
}else{
currentRecursion++;
pdf.addPage();
//$('.myDivClass')[currentRecursion] selects one of the divs out of the jquery collection as a html element
//addHtml requires an html element. Not a string like fromHtml.
pdf.fromHTML($('.myDivClass')[currentRecursion], 15, 20, options, function(){
console.log(currentRecursion);
recursiveAddHtmlAndSave(currentRecursion, totalRecursions)
});
}
}
pdf.fromHTML($('.myDivClass')[currentRecursion], 15, 20, options, function(){
recursiveAddHtmlAndSave(currentRecursion, numRecursionsNeeded);
});
}
PS: I was trying to modify $scope.exportUsingHTML2PDF so that it gives the same output as generated when clicked on "Export using JSPDF" button which calls the function $scope.exportUsingJSPDF.
The problem lies with your function using exportUsingHTML2PDF, the error is that you need to pass in the html to the function of html2PDF. Manage the page css on the basis of your need.
EDIT: You have wrong library. Please check html2pdf.js library within the plunker
Working plunker: html2pdf
$scope.exportUsingHTML2PDF = function() {
var element = document.getElementById('element-to-print');
html2pdf(element, {
margin: 1,
filename: 'myfile.pdf',
image: {
type: 'jpeg',
quality: 0.98
},
html2canvas: {
dpi: 192,
letterRendering: true
},
jsPDF: {
unit: 'in',
format: 'letter',
orientation: 'portrait'
}
});
}
With JSPDF and HTML2PDF, you have to get used to two fundamentally different coding styles:
JSPDF: imperative (javascript statements)
HTML2PDF: declarative (directives embedded in HTML)
So for page breaks:
JSPDF: pdf.addPage();
HTML2PDF: <div class="html2pdf__page-break"></div>
That should work, however HTML2PDF is buggy and gives a "Supplied data is not a JPEG" error when <div class="html2pdf__page-break"></div> is included (at least it does so for me, in Plunkr), despite being totally what the documentation tells us to do.
I haven't got time to debug it. You'll need to do some research. Someone will have posted a solution somewhere on the web.
I am using jspdf.debug.js latest version.
FontAwesome icons used in a web page are not rendering in pdf.
I added a FontAwesome user icon in the page.Refer to the image.(Left one is HTML and pdf output is on right)
Below is my code snippet.
var pdf = new jsPDF('p', 'pt', 'letter');
pdf.addFont('FontAwesome', 'FontAwesome', 'normal');
pdf.setFont('FontAwesome');
pdf.canvas.height = 72 * 11;
pdf.canvas.width = 72 * 8.5;
html2pdf(document.body, pdf, function(pdf){
var iframe = document.createElement('iframe');
iframe.setAttribute('style','position:absolute;right:0; top:0; bottom:0; height:100%; width:500px');
document.body.appendChild(iframe);
iframe.src = pdf.output('datauristring');
});
jspdf does not support special symbols. Here is the gitHub issue.
See info in this answer.
I did in this way and all works with font Awesome 5...
Following this article i uploaded the fa-solid-900-normal.ttf at https://peckconsulting.s3.amazonaws.com/fontconverter/fontconverter.html
I got the js file and import it.
In Angular i did in this way
constructor() {
var callAddFont = function () {
this.addFileToVFS('fa-solid-900-normal.ttf', jsPDFfonts.fontawesome5_fa_solid_900);
this.addFont('fa-solid-900-normal.ttf', 'fa-solid-900', 'normal');
};
jsPDF.API.events.push(['addFonts', callAddFont])
}
where jsPDFfonts.fontawesome5_fa_solid_900 is the content of the file
Then during the print process for printing an icon i did in this way
pdf.setFont('fa-solid-900', 'normal');
pdf.setFontSize(10);
pdf.text('\uf6f0', 15, 15*index);
i printed directly the unicode of the icon