I create a jpeg file over canvas. The image is downloaded and has the name "Download" without file extension. How can I modify the file name for the download via the script?
html2canvas(document.getElementById("rankingTable")).then(function (canvas) {
var image = canvas.toDataURL("image/png", 1)
.replace("image/png", "image/octet-stream");
window.location.href=image;
});
Specify the filename in the download attribute:
function downloadData(linkData, filename) {
let link = document.createElement('a');
link.href = linkData;
link.download = filename;
let target = document.body;
target.appendChild(link); // Firefox requires the link to be in the body
link.click(); // simulate click
target.removeChild(link); // remove the link when done
}
Doc: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-download
I am not sure you need to replace the "image/png" with "image/octet-stream", so try this code:
html2canvas(document.getElementById("rankingTable")).then(function (canvas) {
var image = canvas.toDataURL("image/png", 1);
downloadData(image, "ranking-table.png");
});
here is the copy of my downloaded file
I am trying to download the image using html5canvas, but the issue is it is downloading the file without text.
Here is the snippet of code I am implementing
<script>
function downloadImage(element = document.body, filename = 'file.png')
{html2canvas(element, {
useCORS: true,
}).then((canvas) => {
const a = document.createElement('a');
a.download = filename;
a.href = canvas.toDataURL('image/png');
a.click();
});
}
</script>
you have mentioned you are using html5canvas but you have applied html2canvas.
Do check it once.
I currently have a website using D3 and I'd like the user to have the option to save the SVG as an SVG file. I'm using crowbar.js to do this, but it only works on chrome. Nothing happens of safari and IE gives an access denied on the click() method used in crowbar.js to download the file.
var e = document.createElement('script');
if (window.location.protocol === 'https:') {
e.setAttribute('src', 'https://raw.github.com/NYTimes/svg-crowbar/gh-pages/svg-crowbar.js');
} else {
e.setAttribute('src', 'http://nytimes.github.com/svg-crowbar/svg-crowbar.js');
}
e.setAttribute('class', 'svg-crowbar');
document.body.appendChild(e);
How do I download an SVG file based on the SVG element on my website in safari, IE and chrome?
There are 5 steps. I often use this method to output inline svg.
get inline svg element to output.
get svg source by XMLSerializer.
add name spaces of svg and xlink.
construct url data scheme of svg by encodeURIComponent method.
set this url to href attribute of some "a" element, and right click this link to download svg file.
//get svg element.
var svg = document.getElementById("svg");
//get svg source.
var serializer = new XMLSerializer();
var source = serializer.serializeToString(svg);
//add name spaces.
if(!source.match(/^<svg[^>]+xmlns="http\:\/\/www\.w3\.org\/2000\/svg"/)){
source = source.replace(/^<svg/, '<svg xmlns="http://www.w3.org/2000/svg"');
}
if(!source.match(/^<svg[^>]+"http\:\/\/www\.w3\.org\/1999\/xlink"/)){
source = source.replace(/^<svg/, '<svg xmlns:xlink="http://www.w3.org/1999/xlink"');
}
//add xml declaration
source = '<?xml version="1.0" standalone="no"?>\r\n' + source;
//convert svg source to URI data scheme.
var url = "data:image/svg+xml;charset=utf-8,"+encodeURIComponent(source);
//set url value to a element's href attribute.
document.getElementById("link").href = url;
//you can download svg file by right click menu.
I know this has already been answered, and that answer works well most of the time. However I found that it failed on Chrome (but not Firefox) if the svg image was large-ish (about 1MB). It works if you go back to using a Blob construct, as described here and here. The only difference is the type argument. In my code I wanted a single button press to download the svg for the user, which I accomplished with:
var svgData = $("#figureSvg")[0].outerHTML;
var svgBlob = new Blob([svgData], {type:"image/svg+xml;charset=utf-8"});
var svgUrl = URL.createObjectURL(svgBlob);
var downloadLink = document.createElement("a");
downloadLink.href = svgUrl;
downloadLink.download = "newesttree.svg";
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
October 2019 edit:
Comments have indicated that this code will work even without appending downloadLink to document.body and subsequently removing it after click(). I believe that used to work on Firefox, but as of now it no longer does (Firefox requires that you append and then remove downloadLink). The code works on Chrome either way.
Combining Dave's and defghi1977 answers. Here is a reusable function:
function saveSvg(svgEl, name) {
svgEl.setAttribute("xmlns", "http://www.w3.org/2000/svg");
var svgData = svgEl.outerHTML;
var preface = '<?xml version="1.0" standalone="no"?>\r\n';
var svgBlob = new Blob([preface, svgData], {type:"image/svg+xml;charset=utf-8"});
var svgUrl = URL.createObjectURL(svgBlob);
var downloadLink = document.createElement("a");
downloadLink.href = svgUrl;
downloadLink.download = name;
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
}
Invocation example:
saveSvg(svg, 'test.svg')
For this snippet to work you need FileSaver.js.
function save_as_svg(){
var svg_data = document.getElementById("svg").innerHTML //put id of your svg element here
var head = '<svg title="graph" version="1.1" xmlns="http://www.w3.org/2000/svg">'
//if you have some additional styling like graph edges put them inside <style> tag
var style = '<style>circle {cursor: pointer;stroke-width: 1.5px;}text {font: 10px arial;}path {stroke: DimGrey;stroke-width: 1.5px;}</style>'
var full_svg = head + style + svg_data + "</svg>"
var blob = new Blob([full_svg], {type: "image/svg+xml"});
saveAs(blob, "graph.svg");
};
I tryed every solution here and nothing worked for me. My picture was always smaller than my d3.js canvas.
I had to set the canvas width, height then do a clearRect on the context to make it works. Here is my working version
Export function:
var svgHtml = document.getElementById("d3-canvas"),
svgData = new XMLSerializer().serializeToString(svgHtml),
svgBlob = new Blob([svgData], {type:"image/svg+xml;charset=utf-8"}),
bounding = svgHtml.getBoundingClientRect(),
width = bounding.width * 2,
height = bounding.height * 2,
canvas = document.createElement("canvas"),
context = canvas.getContext("2d"),
exportFileName = 'd3-graph-image.png';
//Set the canvas width and height before loading the new Image
canvas.width = width;
canvas.height = height;
var image = new Image();
image.onload = function() {
//Clear the context
context.clearRect(0, 0, width, height);
context.drawImage(image, 0, 0, width, height);
//Create blob and save if with FileSaver.js
canvas.toBlob(function(blob) {
saveAs(blob, exportFileName);
});
};
var svgUrl = URL.createObjectURL(svgBlob);
image.src = svgUrl;
It use FileSaver.js to save the file.
This is my canvas creation, note that i solve the namespace issue here
d3.js canvas creation:
var canvas = d3.select("body")
.insert("svg")
.attr('id', 'd3-canvas')
//Solve the namespace issue (xmlns and xlink)
.attr("xmlns", "http://www.w3.org/2000/svg")
.attr("xmlns:xlink", "http://www.w3.org/1999/xlink")
.attr("width", width)
.attr("height", height);
While this question has been answered, I created a small library called SaveSVG which can help save D3.js generated SVG which use external stylesheets or external definition files (using <use> and def) tags.
Based on #vasyl-vaskivskyi 's answer.
<script src="../../assets/FileSaver.js"></script>
<script>
function save_as_svg(){
fetch('path/../assets/chart.css')
.then(response => response.text())
.then(text => {
var svg_data = document.getElementById("svg").innerHTML
var head = '<svg title="graph" version="1.1" xmlns="http://www.w3.org/2000/svg">'
var style = "<style>" + text + "</style>"
var full_svg = head + style + svg_data + "</svg>"
var blob = new Blob([full_svg], {type: "image/svg+xml"});
saveAs(blob, "graph.svg");
})
};
save_as_svg();
</script>
The above code read your chart.css and then embed the css code to your svg file.
I try this and worked for me.
function downloadSvg() {
var svg = document.getElementById("svg");
var serializer = new XMLSerializer();
var source = serializer.serializeToString(svg);
source = source.replace(/(\w+)?:?xlink=/g, 'xmlns:xlink='); // Fix root xlink without namespace
source = source.replace(/ns\d+:href/g, 'xlink:href'); // Safari NS namespace fix.
if (!source.match(/^<svg[^>]+xmlns="http\:\/\/www\.w3\.org\/2000\/svg"/)) {
source = source.replace(/^<svg/, '<svg xmlns="http://www.w3.org/2000/svg"');
}
if (!source.match(/^<svg[^>]+"http\:\/\/www\.w3\.org\/1999\/xlink"/)) {
source = source.replace(/^<svg/, '<svg xmlns:xlink="http://www.w3.org/1999/xlink"');
}
var preface = '<?xml version="1.0" standalone="no"?>\r\n';
var svgBlob = new Blob([preface, source], { type: "image/svg+xml;charset=utf-8" });
var svgUrl = URL.createObjectURL(svgBlob);
var downloadLink = document.createElement("a");
downloadLink.href = svgUrl;
downloadLink.download = name;
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
}
In my scenario, I had to use some svg images created using D3.js in other projects. So I opened dev tools and inspected those svg and copied their content. Then created a new blank svg file and pasted the copied content there. Then I used those new svg files in other areas.
And if you want to do it programmatically, then we can use document.getElementById('svgId')
I know this is a basic approach but in case anyone find it useful.
currently I am making a download button on my page via html2canvas, which I successfully got working. But now I want to add a watermark to it before I download it. After a quick google search the watermarkjs library popup, which adds a watermark to image, but I want to add it to a dataURL or canvas before I transform it. Is there a way to do it?
My not functional code:
var watermarkImage = "https://pravdaovode.cz/wp-content/uploads/2018/07/vodoznak.png";
function getScreen() {
html2canvas(div_box).then(function(canvas) {
if ('msToBlob' in canvas) {
var blob = canvas.msToBlob();
navigator.msSaveBlob(blob, 'pravda_o_vode_cenova_mapa.jpg');
}
else {
var a = document.createElement('a');
a.setAttribute('href', watermark([canvas.toDataURL("image/jpeg").replace("image/jpeg", "image/octet-stream"), watermarkImage]));
a.setAttribute('target', '_blank');
a.setAttribute('download', 'pravda_o_vode_cenova_mapa.jpg');
a.style.display = 'none';
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
}
});
}
I'm using HTML2Canvas to convert a table to canvas and then I try to download the image using a download button. My code is as below:
$("input[alt='save-image']").click(function() {
html2canvas($("table"), {
onrendered: function(canvas) {
this.href = canvas.toDataURL();
this.download = "mypainting.png";
}
});
});
The table converts to image; however, the image never downloads. Please let me know if I'm doing anything wrong or if you would like to know more information.
You can download image like this -
html2canvas($('table').get(0)).then( function (canvas) {
// document.body.appendChild(canvas);//
var a = document.createElement('a');
// toDataURL defaults to png, so we need to request a jpeg, then convert for file download.
//a.href = canvas.toDataURL("image/jpeg").replace("image/jpeg", "image/octet-stream");
a.href = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
a.download = 'mypainting.png';
a.click();
});
I made it to work, thanks to T.Shah, and here is my final code:
$("input[alt='save-image']").click(function() {
html2canvas($("table").get(0), {
onrendered: function (canvas) {
var a = document.createElement('a');
a.href = canvas.toDataURL("image/png");
a.download = 'Pixel-Drawing.png';
a.click();
}
});
});