我们正在使用html2canvas.js和html2canvas.svg.js(版本0.5.0 beta1)和highcharts.js将甜甜圈图下载为pdf。
这在Chrome中可以正常工作,但是在IE和Firefox中无法正常工作。在IE中,图表显示不正确,而在Firefox中则根本不显示。
以下是在Chrome,IE和Firefox中下载的屏幕截图
我用来做html2canvas的代码如下:
html2canvas($("#container"), {
onrendered: function (canvas) {
var imgData = canvas.toDataURL(
'image/png');
var doc = new jsPDF('p', 'mm');
doc.addImage(imgData, 'PNG', 10, 10);
doc.save('sample-file.pdf');
}
});
我创建了一个jsFiddle来在这里演示问题-http: //jsfiddle.net/jko0rs5g/3/
有谁知道可能导致此问题的原因,以及我们如何解决该问题?
编辑
Just to clarify why we are not using the built in Highcharts exporting, this for when we are adding additional html to the Highcarts, such as additional information above or below the chart, or a score inside the donut for example. I have updated the jsfiddle to reflect this.
Thanks to Pawel Fus for the nod in the right direction, we got this working using canvg.js, which temporarily replaces the svg with a canvas before calling html2canvas.
The final issue came when some of the html within the svg uses em's to size the font (which unfortunately a lot of our templates do). We got around this by updating the font size for anything using em's to the underlying pixel size before rendering the svg into a canvas (see Get computed font size for DOM element in JS for how we calculated the actual font size)
以下是下载按钮点击的更新代码
$('#download').click(function() {
var svgElements = $("#container").find('svg');
//replace all svgs with a temp canvas
svgElements.each(function() {
var canvas, xml;
// canvg doesn't cope very well with em font sizes so find the calculated size in pixels and replace it in the element.
$.each($(this).find('[style*=em]'), function(index, el) {
$(this).css('font-size', getStyle(el, 'font-size'));
});
canvas = document.createElement("canvas");
canvas.className = "screenShotTempCanvas";
//convert SVG into a XML string
xml = (new XMLSerializer()).serializeToString(this);
// Removing the name space as IE throws an error
xml = xml.replace(/xmlns=\"http:\/\/www\.w3\.org\/2000\/svg\"/, '');
//draw the SVG onto a canvas
canvg(canvas, xml);
$(canvas).insertAfter(this);
//hide the SVG element
$(this).attr('class', 'tempHide');
$(this).hide();
});
html2canvas($("#container"), {
onrendered: function(canvas) {
var imgData = canvas.toDataURL(
'image/png');
var doc = new jsPDF('p', 'mm');
doc.addImage(imgData, 'PNG', 10, 10);
doc.save('sample-file.pdf');
}
});
$("#container").find('.screenShotTempCanvas').remove();
$("#container").find('.tempHide').show().removeClass('tempHide');
});
在此处查看其操作的更新的jsfiddle- http://jsfiddle.net/zuvzcgvz/22/
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