Is there a way to allow a user, after he has created a vector graph on a javascript svg canvas using a browser, to download this file to their local filesystem?
SVG is a total new field for me so please be patient if my wording is not accurate.
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
回答1:
It might be possible using the regular "Save" browser command, but it won't just save the SVG canvas, it will save the whole page.
I believe your best bet is to use AJAX and send the whole SVG XML data as POST data to a server script, and have that script just send back the POST data with the header Content-Disposition: attachment; filename=yourfile.svg.
(Under PHP, you can get the raw POST contents with file_get_contents('php://input').)
回答2:
You can avoid a round trip to the server.
Base64 encode your SVG xml.
Then generate a link to that data. The user can right click on to save it locally.
// This example was created using Protovis & jQuery
// Base64 provided by http://www.webtoolkit.info/javascript-base64.html
// Modern web browsers have a builtin function to this as well 'btoa'
function encode_as_img_and_link(){
// Add some critical information
$("svg").attr({ version: '1.1' , xmlns:"http://www.w3.org/2000/svg"});
var svg = $("#chart-canvas").html();
var b64 = Base64.encode(svg); // or use btoa if supported
// Works in recent Webkit(Chrome)
$("body").append($("<img src='data:image/svg+xml;base64,\n"+b64+"' alt='file.svg'/>"));
// Works in Firefox 3.6 and Webit and possibly any browser which supports the data-uri
$("body").append($("<a href-lang='image/svg+xml' href='data:image/svg+xml;base64,\n"+b64+"' title='file.svg'>Download</a>"));
}
The img tag works in Webkit, the link works in Webkit & Firefox, and may work in any browser which supports data-uri
回答3:
Using FileSaver.js
saveAs(new Blob([SVG_DATA_HERE], {type:"application/svg+xml"}), "name.svg")
回答4:
There is no need to do base64 encoding - you can create a link with raw SVG code in it. Here is a modified function encode_as_img_and_link() from The_Who's answer:
function img_and_link() {
$('body').append(
$('<a>')
.attr('href-lang', 'image/svg+xml')
.attr('href', 'data:image/svg+xml;utf8,' + unescape($('svg')[0].outerHTML))
.text('Download')
);
}
回答5:
With FileSaver from Eli Grey I got it working (chrome):
bb = new window.WebKitBlobBuilder;
var svg = $('#designpanel').svg('get');
bb.append(svg.toSVG());
var blob = bb.getBlob("application/svg+xml;charset=" + svg.characterSet);
saveAs(blob,"name.svg");
SVG is from keith woods jquery's svg.
Html Rocks 1
Html Rocks 2
回答6:
// save SVG
$('#SVGsave').click(function(){
var a = document.createElement('a');
a.href = 'data:image/svg+xml;utf8,' + unescape($('#SVG')[0].outerHTML);
a.download = 'plot.svg';
a.target = '_blank';
document.body.appendChild(a); a.click(); document.body.removeChild(a);
});回答7:
I recently found this Chrome plugin http://nytimes.github.io/svg-crowbar/. It's a bit buggy for my needs but essentially works.
I had previously made a solution similar to the accepted answer which involved a serverside script but it's quite long winded and also had the problem that all the styles had to be inline in the markup. Crowbar seems to take care of that for you, which is nice.
回答8:
I'm replying to this topic, even though it's a few years old, because the recent convergence of web browsers in their support for SVG and other relevant behaviour has produced renewed interest in SVG and allows a 'universal' answer to the question. In essence zneak's approach is correct but, in my opinion, terse (i.e. it took me a while to get it working for myself). I also think that his reference to AJAX is either unnecessary or not what I understand by AJAX (= uses an XMLHttpRequest). I shall therefore provide a more detailed answer using pure JavaScript (i.e. without JQuery or any other library) and provide server code for Java, Perl and PHP.
(1) Have the (dynamically generated) SVG content in your HTML page enclosed in a div with a unique ID, e.g.
<div id="svg"><svg...>SVG content</svg></div>
(2) Include a button to invoke the JavaScript function, e.g.
<button onclick="sendSVG();">Save as SVG File</button>
(3) Include the JavaScript function named in your button markup:
function sendSVG()
{
var svgText = document.getElementById('svg').innerHTML;
var form = document.createElement("form");
form.setAttribute("method", "post");
form.setAttribute("action", "http://path-to-your-server-app");
form.setAttribute("accept-charset", "UTF-8");
var hiddenSVGField = document.createElement("input");
hiddenSVGField.setAttribute("type", "hidden");
hiddenSVGField.setAttribute("name", "svgText");
hiddenSVGField.setAttribute("value", svgText);
form.appendChild(hiddenSVGField);
document.body.appendChild(form);
form.submit();
}
(4) Write a server app to accept your SVGtext post request and return as image/svg+xml using Content-Disposition to specify an attachment. Working code in three languages is presented, although I am not a Perl programmer and have never used PHP in anger.
Java Servlet
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
String svgText = (String) request.getParameter("svgText");
response.setContentType("image/svg+xml");
response.addHeader("Content-Disposition", "attachment; filename=\"image.svg\"");
PrintWriter out = response.getWriter();
out.println(svgText);
}
Perl CGI
use CGI qw(:standard);
my $svgText = param('svgText');
print header(-type => "image/svg+xml",
-content_disposition => "attachment; filename=image.svg");
print $svgText;
PHP
<?php
$svgText = $_POST['svgText'];
header('Content-type: image/svg+xml');
header('Content-Disposition: attachment; filename="image.svg"');
print "$svgText";
?>
I have used a hard-coded name for the image here (image.svg), but actually pick up a discriptor of the dynamic content I generate from the page (using a div and an ID again, and document.getElementById('graphName').textContent).
This has been tested on Mac Safari 9, Firefox 42, Chrome 47, Opera 34, and Windows7/IE 11 and Windows10/Edge and in each case the svg file is downloaded or one is prompted to download it. The resulting files will open in, e.g. Adobe Illustrator or whatever other application you have set to open svg files.
A real-world example of this (if you consider academic research real-world) is at http://flyatlas.gla.ac.uk/MidgutAtlas/index.html in the Gene section.
回答9:
Yes is it possible. Use jquery.svg http://keith-wood.name/svgRef.html and post the svg xml data using the function svg.toSVG() (writing into a hidden field on submit). Have the php save and convert to raster using imagemagick (convert image.svg image.png) then force the file to download using header("Content-Type: application/octet-stream") and readfile the image.
回答10:
Most compatible way would be a round-trip to the server. You could also use a data: URI in some browsers.
回答11:
You can't save anything with javascript to the local filesystem, what you should do is send the contents of the canvas to the server and make the user download and save that.
回答12:
To answer my own question:
Another possibility though not the nicest is to display the serialized contents on the webpage and have the user select, copy and paste that. This after investigating eli grey's solution.
回答13:
I maybe discovered a better way for not forcing the user to press right click "save image as". just live draw the canvas base64 code into the href of the link and modify it so the download will start automatically. i dont know if its universal browser compatible but it should work with the main/new browsers.
var canvas = document.getElementById('your-canvas');
if (canvas.getContext) {
var C = canvas.getContext('2d');
}
$('#your-canvas').mousedown(function(event) {
// feel free to choose your event ;)
// just for example
// var OFFSET = $(this).offset();
// var x = event.pageX - OFFSET.left;
// var y = event.pageY - OFFSET.top;
// standard data to url
var imgdata = canvas.toDataURL('image/png');
// modify the dataUrl so the browser starts downloading it instead of just showing it
var newdata = imgdata.replace(/^data:image\/png/,'data:application/octet-stream');
// give the link the values it needs
$('a.linkwithnewattr').attr('download','your_pic_name.png').attr('href',newdata);
});
feel free to wrap the a around anything you want, hope that helps a bit
回答14:
$(document).ready(function(){
$("#btnDownload").click(function(){
var $container = $('#svg-container'),
// Canvg requires trimmed content
content = $container.html().trim(),
canvas = document.getElementById('svg-canvas');
// Draw svg on canvas
canvg(canvas, content);
$container.hide();
// Change img be SVG representation
var theImage = canvas.toDataURL('image/jpeg');
var a = document.createElement('a');
a.href = theImage; // xhr.response es un blob file
a.target = '_blank';
a.download = 'prueba'; // nombre del archivo.
a.style.display = 'none';
document.body.appendChild(a);
a.click();
delete a;
});//fin function
});// fin <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript" src="http://canvg.googlecode.com/svn/trunk/rgbcolor.js"></script>
<script type="text/javascript" src="http://canvg.googlecode.com/svn/trunk/canvg.js"></script>
<input id="svgData" name="svgData" type="hidden"/>
<input id="btnDownload" type="button" value="Descargar"/>
<div id='svg-container'>
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</div>
<section>
<canvas id="svg-canvas"></canvas>
</section>回答15:
I made a clean/usable bookmarklet out of the suggestions.
It will put a unique link next to every inline <svg> on the page.
https://codepen.io/corysimmons/pen/vybzqV
Hope it helps someone.
回答16:
No need to do any programming at all. There are online apps people have already built for that, and include definable parameters such as dimensions, resolution, output format etc.
This is one of the better online image conversion apps I've found for svg->jpeg.http://image.online-convert.com/convert-to-jpg
