<!DOCTYPE html>
<title>drag &amp; drop - multiple file drop</title>
<style>
  body > div {
    height: 200px;
    width: 200px;
    background-color: orange;
  }
</style>

<script>
var filename1 = 'fail.png', filesize1 = '759', filetype1 = 'image/png', filename2 = 'fail.txt', filesize2 = '4', filetype2 = 'text/plain';
var fails = [], finished = false, donecount = 0;
window.onload = function() {
  var orange = document.getElementsByTagName('div')[0];
  orange.ondragover = orange.ondragenter = function(e) {
   	e.preventDefault();
    e.dataTransfer.dropEffect = 'copy';
		if( !e.dataTransfer.files ) {
			fails[fails.length] = 'No dataTransfer.files for '+e.type;
		}
		if( !window.FileList ) {
			fails[fails.length] = 'No FileList interface object';
			return;
		}
		if( !( e.dataTransfer.files instanceof FileList ) ) {
			fails[fails.length] = 'dataTransfer.files is not a FileList';
		}
		if( e.dataTransfer.files.length ) {
			fails[fails.length] = 'dataTransfer.files.length is '+e.dataTransfer.files.length+' instead of 0 for '+e.type;
		}
  };
	orange.ondrop = function(e) {
   	e.preventDefault();
		if( !e.dataTransfer.files ) {
			fails[fails.length] = 'No dataTransfer.files for '+e.type;
		}
		if( !window.FileList ) {
			fails[fails.length] = 'No FileList interface object';
			finish();
			return;
		}
		if( !( e.dataTransfer.files instanceof FileList ) ) {
			fails[fails.length] = 'dataTransfer.files is not a FileList';
		}
		if( e.dataTransfer.files.length != 2 ) {
			fails[fails.length] = 'dataTransfer.files.length is '+e.dataTransfer.files.length+' instead of 2 for '+e.type;
		}
		if( !e.dataTransfer.files[0] ) {
			fails[fails.length] = 'no dataTransfer.files[0] for drop';
			finish();
			return;
		}
		if( !e.dataTransfer.files[1] ) {
			fails[fails.length] = 'no dataTransfer.files[1] for drop';
			finish();
			return;
		}
		//allow files to be dropped in any order, since this will be determined by the OS
		var i0 = 0, i1 = 1;
		if( e.dataTransfer.files[0].name == filename2 ) {
			i0 = 1;
			i1 = 0;
		}
		if( e.dataTransfer.files[i0].size != filesize1 ) {
			fails[fails.length] = 'dataTransfer.files['+i0+'].size '+e.dataTransfer.files[i0].size+' instead of '+filesize1;
		}
		/*
		if( !e.dataTransfer.files[i0].lastModifiedDate ) {
			fails[fails.length] = 'no dataTransfer.files['+i0+'].lastModifiedDate';
		}
		*/
		if( e.dataTransfer.files[i0].name != filename1 ) {
			fails[fails.length] = 'dataTransfer.files['+i0+'].name '+e.dataTransfer.files[i0].name+' instead of '+filename1;
		}
		if( e.dataTransfer.files[i0].type != filetype1 ) {
			fails[fails.length] = 'dataTransfer.files['+i0+'].type '+e.dataTransfer.files[i0].type+' instead of '+filetype1;
		}
		if( e.dataTransfer.files[i1].size != filesize2 ) {
			fails[fails.length] = 'dataTransfer.files['+i1+'].size '+e.dataTransfer.files[i1].size+' instead of '+filesize2;
		}
		/*
		if( !e.dataTransfer.files[i1].lastModifiedDate ) {
			fails[fails.length] = 'no dataTransfer.files['+i1+'].lastModifiedDate';
		}
		*/
		if( e.dataTransfer.files[i1].name != filename2 ) {
			fails[fails.length] = 'dataTransfer.files['+i1+'].name '+e.dataTransfer.files[i1].name+' instead of '+filename2;
		}
		if( e.dataTransfer.files[i1].type != filetype2 ) {
			fails[fails.length] = 'dataTransfer.files['+i1+'].type '+e.dataTransfer.files[i1].type+' instead of '+filetype2;
		}
		if( !window.FileReader ) {
			fails[fails.length] = 'No FileReader constructor';
			finish();
			return;
		}
		var reader1 = new FileReader();
		reader1.readAsBinaryString(e.dataTransfer.files[i0]);
		reader1.onload = function () {
			if( !reader1.result ) {
				fails[fails.length] = 'No files['+i0+'] data after load';
			}
			if( reader1.result.length != filesize1 ) {
				fails[fails.length] = 'files['+i0+'] file data length '+reader1.result.length+' instead of '+filesize1;
			}
			if( donecount++ ) {
				finish();
			}
		};
		var reader2 = new FileReader();
		reader2.onload = function () {
			if( !reader2.result ) {
				fails[fails.length] = 'No files['+i1+'] data after load';
			}
			if( reader2.result.length != filesize2 ) {
				fails[fails.length] = 'files['+i1+'] file data length '+reader2.result.length+' instead of '+filesize2;
			}
			if( donecount++ ) {
				finish();
			}
		};
		reader2.readAsBinaryString(e.dataTransfer.files[i1]);
		setTimeout(function () {
			if( !reader1.result ) {
				fails[fails.length] = 'No files['+i0+'] data after timeout';
			}
			if( !reader2.result ) {
				fails[fails.length] = 'No files['+i1+'] data after timeout';
			}
			finish();
		},1000);
  };

};
function finish() {
	if( finished ) { return; }
	finished = true;
	document.getElementsByTagName('p')[0].innerHTML = fails.length ? ( 'FAIL: ' + fails.join('<br>') ) : 'PASS';
}
</script>

<div></div>

<p>Save <a href="../resources/fail.png">this image</a> and <a href="fail.txt">this text file</a> to your desktop. Use your pointing device to drag both saved files (at the same time) from your desktop onto the orange box, and release them. If a confirmation dialog appears, accept it. Fail if nothing happens, or if the browser simply displays one/both of the files.</p>
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