使用html2canvas隐藏div的屏幕截图

Question

如何拍摄隐藏div的截图？下面给出的代码不适用于隐藏的div.

HTML

<div id="mydiv" style="display:none;" >  
 <p>Text</p>
</div>

<div id="canvas" style="display:none;">
<p>Canvas:</p>
</div>

 <div id="image">

  </div>

脚本

<script>
  var elem = $('#printDiv');
        html2canvas(elem, {
            onrendered: function (canvas) {
                var data = canvas.toDataURL('image/png');
                var image = new Image();
                image.src = data;
                document.getElementById('image').appendChild(image);
            }
        });

</script>

当我们将div"mydiv"的样式设置为"display:block"时,它可以工作.

Answer 1

您可以将不透明度设置为0.以下是示例示例:

<div style="position: absolute; opacity: 0.0;">
    <div id="tempImageThumbnail"></div>
</div>
var tempImageThumb = $('#tempImageThumbnail');
tempImageThumb.append("<div>some text</div>");

html2canvas([tempImageThumb.get(0)], {
    onrendered : function(canvas) {
         document.body.appendChild(canvas);
    }
});

Answer 2

html2canvas(mydiv, {
    onclone: function (clonedDoc) {
        clonedDoc.getElementById('mydiv').style.display = 'block';
    }
}).then((canvas)=>{
//your onrendered function code here
})

Answer 3

以下代码对我有用。我将 Angular 与 jsPdf 和 html2canvas 库一起使用

    html2canvas(document.getElementById("pdfTable"), {
  onclone: function (clonedDoc) {

     // I made the div hidden and here I am changing it to visible
    clonedDoc.getElementById('pdfTable').style.visibility = 'visible';
  }
}).then(canvas => {
  // The following code is to create a pdf file for the taken screenshot
  var pdf = new jsPDF('l', 'pt', [canvas.width, canvas.height]);
  var imgData = canvas.toDataURL("PNG", 1.0);
  pdf.addImage(imgData, 0, 0, (canvas.width), (canvas.height));
  pdf.save('converteddoc.pdf');
});

Answer 4

我不确定是否有一种现成的方法可以实现这一目标。显示 div、捕获然后再次隐藏怎么样？

var elem = $('#printDiv');

html2canvas(elem, {
    onrendered: function (canvas) {
        elem.show();
        var data = canvas.toDataURL('image/png');
        var image = new Image();
        image.src = data;
        document.getElementById('image').appendChild(image);
        elem.hide();
    }
});