html2canvas screenshot capturing current window, not entire body

Question

Trying to capture a screenshot of the entire body of a page (including the fields filled in by user) in javascript, but html2canvas only captures the current window, even when I set the height to a huge number. The html2canvas website examples appear to have my desired functionality, but I'm not able to understand what they're doing differently.

<button id="pdfbutton" type="button">Click Me!</button>

<script type="text/javascript">
$( "#pdfbutton" ).click(function() {
    html2canvas(document.body, {
        onrendered: function(canvas) {
            // document.body.appendChild(canvas);
            var img = canvas.toDataURL("image/png");
            console.log(img);
            document.body.appendChild(canvas);

        }
        // height: 10000
    });
});
</script>

Please let me know if there are any other ways to capture a screenshot on a button click in javascript (without inserting a URL, because the user fills in fields on my page).

Answer 1

Solved this problem by removing style attribute (height, position) which does not support by html2canvas and adding it after capturing the screenshot. In my case I faced problem with position.

  $('.element').css('position','initial'); // Change absolute to initial
  $my_view = $('#my-view');
  var useHeight = $('#my-view').prop('scrollHeight');
  html2canvas($my_view[0], {
    height: useHeight,
    useCORS: true,
    allowTaint: true,
    proxy: "your proxy url",
    onrendered: function (canvas) {
        var imgSrc = canvas.toDataURL();
        var popup = window.open(imgSrc);
        $('.element').css('position','absolute');
    }
  });

This will take screenshot of the whole screen including scrollable part. check this solution