Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

TIFF File not loading in the Plain Javascript

See original GitHub issue

<html>
<body>
<div id="openseadragon1" >
</div>

<script src="tiff.min.js"></script>
<script src="openseadragon.min.js"></script>
<script src="jquery-2.0.3.min.js"></script>
<script src="imaginghelper.js"></script>
<script type="text/javascript">

  var viewer = OpenSeadragon({
    id: "openseadragon1",
        prefixUrl: "images/",
		 crossOriginPolicy: 'Anonymous',
		   ajaxWithCredentials: false,
		    
		sequenceMode:  true,
		preload:true,
		  tileSources: [{
            x: 0.883,
            y: 1,
            width: 100,
            tileSource: "file_example_TIFF_1MB.tiff"
        },
        {
            x: 1,
            y: 1,
            width: 200,
            tileSource: "file_example_TIFF_1MB.tiff"
        }
   ] 
});

 

/*viewer.addHandler("page", function (data) {
viewer.open();
   viewer.addTiledImage({
    tileSource: '20190022.177000.01.tif',
    x: 5,
    y: 0,
    width: 10
});
	
});*/

 
function FnOnlcik()
{
	alert(11)
}
</script>
</body>
</html>

Issue Analytics

State:
Created 5 years ago
Comments:13 (6 by maintainers)

Top GitHub Comments

1reaction

iangilmancommented, Feb 15, 2019

I don’t think OSD currently supports directly loading from canvas (though that’s an interesting feature idea). You would need to convert it to a dataURL and then add the image once it’s ready. Something like so:

var viewer = OpenSeadragon({
  id: "openseadragon1",
  prefixUrl: "images/",
  crossOriginPolicy: 'Anonymous',
  ajaxWithCredentials: false,
  sequenceMode: true,
  preload: true,
  showNavigator: true
});

function fnLoadData() {
  var width = 100;
  try {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', "A1001001A19B13B55647B25937.tif");
    xhr.responseType = 'arraybuffer';
    xhr.onload = function (e) {
      var tiff = new Tiff({ buffer: xhr.response });
      alert(tiff.countDirectory());
      for (var i = 0, len = tiff.countDirectory(); i < len; ++i) {
        tiff.setDirectory(i);
        var canvas = tiff.toCanvas();
        viewer.addTiledImage({
          tileSource: {
            type: 'image',
            url: canvas.toDataURL(),
            buildPyramid: false
          },
          x: i * width,
          y: 0,
          width: width
        });
      }
    };

    xhr.send();
  }
  catch (e) {
    alert(e.description);
  }
}

fnLoadData();

BTW, note that I’m providing positioning info with each of the images, but you’re creating the viewer with sequenceMode: true, which means it’ll override that positioning info. You can try it both ways to see which you prefer.

Also note that I’ve mode buildPyramid: false into the tileSource; it’s not a viewer option.

0reactions

farookshaikcommented, Feb 20, 2019

Thank you. Your approach works perfectly for me.