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<!DOCTYPE html>
<title>drag & drop - prompting before exposing files</title>
<style>
body > div {
height: 200px;
width: 200px;
background-color: orange;
}
</style>
<script>
var filename = 'fail.png', filesize = '759', filetype = 'image/png';
var fails = [], finished = false;
window.onload = function() {
var orange = document.getElementsByTagName('div')[0];
orange.ondragover = orange.ondragenter = function(e) {
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
};
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 != 1 ) {
fails[fails.length] = 'dataTransfer.files.length is '+e.dataTransfer.files.length+' instead of 1 for '+e.type;
}
if( !e.dataTransfer.files[0] ) {
fails[fails.length] = 'no dataTransfer.files[0] for drop';
finish();
return;
}
if( e.dataTransfer.files[0].size != filesize ) {
fails[fails.length] = 'dataTransfer.files[0].size '+e.dataTransfer.files[0].size+' instead of '+filesize;
}
/*
if( !e.dataTransfer.files[0].lastModified ) {
fails[fails.length] = 'no dataTransfer.files[0].lastModified';
}
*/
if( e.dataTransfer.files[0].name != filename ) {
fails[fails.length] = 'dataTransfer.files[0].name '+e.dataTransfer.files[0].name+' instead of '+filename;
}
if( e.dataTransfer.files[0].type != filetype ) {
fails[fails.length] = 'dataTransfer.files[0].type '+e.dataTransfer.files[0].type+' instead of '+filetype;
}
if( !window.FileReader ) {
fails[fails.length] = 'No FileReader constructor';
finish();
return;
}
var reader = new FileReader();
reader.onload = function () {
if( !reader.result ) {
fails[fails.length] = 'No file data after load';
}
if( reader.result.length != filesize ) {
fails[fails.length] = 'File data length '+reader.result.length+' instead of '+filesize;
}
finish();
};
reader.readAsBinaryString(e.dataTransfer.files[0]);
setTimeout(function () {
if( !reader.result ) {
fails[fails.length] = 'No file 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> to your desktop. Use your pointing device to drag the saved file from your desktop onto the orange box, and release it. <strong>A confirmation dialog must appear, allowing you to choose to cancel the upload</strong>. Accept it. Fail if nothing happens, or if the browser simply displays the image, or if "PASS" appears as the page text <strong>before</strong> you have accepted the upload.</p>
<noscript><p>Enable JavaScript and reload</p></noscript>
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