SVG to PDF conversion working for Plotly.js but not for C3.js
Question
I am using css2pdf for saving my svg chart to pdf after onclick event. It works nicely for plotly.js, but not for c3.js - please see my fiddle: http://jsfiddle.net/3hs7cs4f/
I am sure it has to do something with the c3.js svg properties, but I have no idea how to solve this.
Here is the code:
<link href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.css" rel="stylesheet" />
<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
<script src="http://www.cloudformatter.com/Resources/Pages/CSS2Pdf/Scrip /xeponline.jqplugin.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.js"></script>
</head>
<body>
<br><br>
<!-- Source and on-click event for plotly.js -->
<div id="plotly_chart" style="width: 90%; height: 270px"></div>
<button onclick="return xepOnline.Formatter.Format('plotly_chart',{pageWidth:'11in', pageHeight:'8.5in',render:'download', srctype:'svg'});">Get plotly_PDF</button>
<!-- Source and on-click event for c3.js-->
<div id="c3_chart" style="width: 90%; height: 270px"></div>
<button onclick="return xepOnline.Formatter.Format('c3_chart',{pageWidth:'11in', pageHeight:'8.5in',render:'download', srctype:'svg'});">Get c3_PDF</button>
<!-- JAVASCRIPT for plotly.js chart -->
<script type="text/javascript">
Chart = document.getElementById('plotly_chart');
Plotly.plot( Chart, [{
x: [1, 2, 3, 4, 5],
y: [1, 2, 4, 8, 16] }], {
margin: { t: 0 } } );
</script>
<!-- JAVASCRIPT for j3.js chart -->
<script type="text/javascript">
var chart = c3.generate({
bindto: '#c3_chart',
padding: {
top: 10,
right: 70,
bottom: 50,
left: 75,
},
data: {
columns: [
['data1', 100, 200, 150, 300, 200],
['data2', 400, 500, 250, 700, 300],
]
}});
</script>
I tried a lot of other ways to save my c3.js charts, but none of them worked satisfyingly. The only thing that works is the ng-c3 exporter from annatomka, which uses the AngularJS module ( https://github.com/annatomka/ng-c3-export ). However, this one does not handle all of the css settings in my hands, and the quality of the downloaded png is limited by screen resolution. Thus, I really would like to go for a pdf exporter, and the one I found that handles all the css settings is css2pdf. But any other suggestions how to save c3 chart as pdf that work are also much appreciated. Thanks for the help!
1 answers
solution1
5 ACCPTED 2017-06-27 17:49:12
As I suspected in the comment above, the SVG drawn by c3 lacks the SVG namespace. Css2PDF requires that SVG's be in this namespace.
See http://www.cloudformatter.com/CSS2Pdf.APIDoc.FAQ , first FAQ as it is the number one question asked.
To solve this issue, I added a little hack to inject the namespace attribute to this plot before print. There are better ways I am sure but this fiddle shows your result working.
<script>
function addnsandprint(){
$('#c3_chart').find('svg').attr('xmlns','http://www.w3.org/2000/svg');
xepOnline.Formatter.Format('c3_chart',{pageWidth:'11in',
pageHeight:'8.5in',render:'download', srctype:'svg'});
}
</script>
Fiddle: http://jsfiddle.net/3hs7cs4f/9/
Result:
NOTE: If your SVG makes use of xlink, you would also need to add the "xmlns:xlink" attribute of " http://www.w3.org/1999/xlink ". For safe formatting, I would add both in your code.
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