将html2Canvas与HighCharts一起使用

Question

我想用在讨论html2canvas http://html2canvas.hertzen.com/documentation.html的HTML内容转换为图像.但是我没有正确地获得HighCharts的图像.在IE10上它呈现空白图像,在Chrome上呈现它的一部分.为此可以使用html2canvas.

Answer 1

Highcharts使用svg绘制图表.您将需要使用canvg库将此svg绘制到临时画布,然后在使用html2canvas截取屏幕截图后删除该画布.

以下是canvg的链接:https://code.google.com/p/canvg/downloads/list

试试这个:

//find all svg elements in $container
//$container is the jQuery object of the div that you need to convert to image. This div may contain highcharts along with other child divs, etc
var svgElements= $container.find('svg');

//replace all svgs with a temp canvas
svgElements.each(function () {
    var canvas, xml;

    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.className = "tempHide";
    $(this).hide();
});

//...
//HERE GOES YOUR CODE FOR HTML2CANVAS SCREENSHOT
//...

//After your image is generated revert the temporary changes
$container.find('.screenShotTempCanvas').remove();
$container.find('.tempHide').show().removeClass('tempHide');