change transparent color into white in html2canvas

问题

I am using javascript library html2canvas to save the table of my project. It works fine but when I save the image it shows transparent background color for PNG and background color black for jpeg. Here is what I did:

<script>
        window.onload = function(){
              html2canvas(document.getElementById("tablePng"),{
                    onrendered: function(canvas){
                    var img = canvas.toDataURL('image/jpeg');
                    $('#saveTable').attr('href',img);
                  }
              });
      };
</script>

Doing these above will save the images but the background colour will be black and when changing var img = canvas.toDataURL('image/png'); the background will be transparent. And adding background as In documentation says:

    <script>
        window.onload = function(){
              html2canvas(document.getElementById("tablePng"),{
                    background: "#fff",
                    onrendered: function(canvas){                     
                    var img = canvas.toDataURL('image/jpeg');
                    $('#saveTable').attr('href',img);
                  }
              });
      };
</script>

will change nothing... give transparent.

So how do I change the background ground color so that the images saved will be readable easily?

回答1:

simply add css background-color:#ffffff to your table :)

hope this helps

来源：https://stackoverflow.com/questions/23891483/change-transparent-color-into-white-in-html2canvas