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<!doctype html>
<html>
<head>
<title>Dropping file into dropzone</title>
<style type="text/css">
span { display: inline-block; height: 100px; width: 100px; background: orange; }
span + span { background: blue; }
</style>
<script type="text/javascript">
window.onload = function () {
var drag = document.getElementsByTagName('span')[0];
drag.ondragstart = function (e) {
e.dataTransfer.setData('text','PASS');
e.dataTransfer.effectAllowed = 'copy';
var filein = document.getElementsByTagName('input')[0];
if( !filein.files ) {
document.getElementsByTagName('p')[0].innerHTML = 'FAIL - file API is not supported.';
return;
}
if( !filein.files[0] ) {
document.getElementsByTagName('p')[0].innerHTML = 'FAIL - no file was found in the file input.';
return;
}
var thefile = filein.files[0];
try {
e.dataTransfer.items.add(thefile);
} catch(err) {
document.getElementsByTagName('p')[0].innerHTML = 'FAIL - error when adding file';
e.preventDefault();
return;
}
if( e.dataTransfer.files.length != 1 ) {
document.getElementsByTagName('p')[0].innerHTML = 'FAIL - file was not attached to data store';
e.preventDefault();
return;
}
};
document.getElementsByTagName('span')[1].ondrop = function (e) {
e.preventDefault();
if( document.getElementsByTagName('p')[0].innerHTML ) { return; }
if( e.dataTransfer.files.length != 1 ) {
document.getElementsByTagName('p')[0].innerHTML = 'FAIL - file was not attached to data store during drop';
e.preventDefault();
return;
}
if( !window.FileReader ) {
document.getElementsByTagName('p')[0].innerHTML = 'No FileReader constructor';
e.preventDefault();
return;
}
var reader = new FileReader();
reader.onload = function () {
if( !reader.result ) {
document.getElementsByTagName('p')[0].innerHTML = 'No file data after load';
} else if( !document.getElementsByTagName('p')[0].innerHTML ) {
document.getElementsByTagName('p')[0].innerHTML = 'PASS';
}
};
reader.readAsBinaryString(e.dataTransfer.files[0]);
setTimeout(function () {
if( !reader.result ) {
document.getElementsByTagName('p')[0].innerHTML = 'No file data after timeout';
}
},1000);
};
};
</script>
</head>
<body>
<ol>
<li>Select a non-empty plain text file on your computer using the following input: <input type="file"></li>
<li>Drag the orange square onto the blue square and release it:<br><span draggable="true"></span> <span dropzone="copy file:text/plain"></span><br>
If a prompt appears, accept it.</li>
<li>Fail if new text does not appear below.</li>
</ol>
<p></p>
<noscript><p>Enable JavaScript and reload</p></noscript>
</body>
</html>
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