demandjs/test/test025.html at master · hannasm/demandjs · GitHub

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<html>
  <head>
    <link rel='stylesheet' type="text/css" href='base.css' />
    <script src='imagelist.js'></script>
  </head>
  <body>
    <script type="text/javascript">
      for (var i = 0; i < window.test_images.length; i++) {i
        var cls = '';
        if (i%3 == 0) {
          cls = 'data-demand="spinner" ';
        } else if (i%3 == 1) {
          cls = 'data-demand="progress" ';
        }

        document.write('<div><img src="' + window.test_images[i] + '" ' + cls + '/></div><br/>');
      }
    </script>
    <script src="../demandjs.debug.js"></script>
    <script type="text/javascript" language="javascript">
      var options = {
        enableOffloading: true,
        rootMarginOuter: '2048px',
        thresholdOuter: 0.1,
        createLoadingNode: function (tgt, info) {
          var placeholderRoot = document.createElement('div');
          placeholderRoot.style.position = 'relative';

          var loadingText = document.createElement('div');
          loadingText.innerText = 'Loading in progress';
          loadingText.style.height = '500px';
          placeholderRoot.appendChild(loadingText);

          if (info.isOffloading) {
            var cvsSize = document.createElement('canvas');
            cvsSize.width = info.demandWidth;
            cvsSize.height = info.demandHeight;
            var cvsSizeCtx = cvsSize.getContext('2d');
            cvsSizeCtx.fillStyle = '#F00';
            cvsSizeCtx.fillRect(0,0,cvsSize.width,cvsSize.height);

            var offloadImg = document.createElement('img');
            offloadImg.src = cvsSize.toDataURL('image/jpeg');
            offloadImg.className = 'nodemand';
            placeholderRoot.appendChild(offloadImg);

            loadingText.style.position = 'absolute';
            loadingText.style.top = '10%';
            loadingText.style.left = '10%';
            loadingText.style.zIndex = 100;
            loadingText.style.color = '#FFF';
          }

          return [placeholderRoot];
        }
      };
      window.DemandJSDemanded = new DemandJS(options);
    </script>
  </body>
</html>