fstest.js

var Module = {
        preRun: [],
        postRun: [],
        print: (function() {
          return function(text) {
            if (arguments.length > 1)
            {
              text = Array.prototype.slice.call(arguments).join(' ');
            }
            console.log(text);
          };
        })(),
        printErr: function(text) {
          if (arguments.length > 1)
          {
            text = Array.prototype.slice.call(arguments).join(' ');
          }          
          console.error(text);
        },
        canvas: (function() {
          var canvas = document.getElementById('canvas');

          // As a default initial behavior, pop up an alert when webgl context is lost. To make your
          // application robust, you may want to override this behavior before shipping!
          // See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
          canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);

          return canvas;
        })(),
        setStatus: function(text) {
          if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
          if (text === Module.setStatus.last.text) return;
          var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
          var now = Date.now();
          if (m && now - Module.setStatus.last.time < 30) return; // if this is a progress update, skip it if too soon
          Module.setStatus.last.time = now;
          Module.setStatus.last.text = text;

          if (m) {
            text = m[1];
            spinnerElement.hidden = false;
          } 
          else {
            if (!text) spinnerElement.hidden = true;
          }
          statusElement.innerHTML = text;

        },
        totalDependencies: 0,
        monitorRunDependencies: function(left) {
          this.totalDependencies = Math.max(this.totalDependencies, left);
          Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
        }
      };

      window.ondragover = function(ev) {ev.preventDefault()}
      window.ondrop = function (ev) {
        ev.preventDefault();
        
        if (ev.dataTransfer.items) {
          // Use DataTransferItemList interface to access the file(s)
          for (var i = 0; i < ev.dataTransfer.items.length; i++) {
            // If dropped items aren't files, reject them
            if (ev.dataTransfer.items[i].kind === 'file') {
              var file = ev.dataTransfer.items[i].getAsFile();
              console.log('... file[' + i + '].name = ' + file.name);
              Module.FS.writeFile(file.name,arrayBuf)
            }
          }
        } else {
          // Use DataTransfer interface to access the file(s)
          for (var i = 0; i < ev.dataTransfer.files.length; i++) {
            var file = ev.dataTransfer.files[i];
            var arrayBuf = file.arrayBuffer();
            //TODO: get this into C++
            Module.FS.writeFile(file.name,arrayBuf)
          }
        }
      }