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<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body, html {
width: 100%;
height: 100%;
margin: 0;
font-family: -apple-system;
}
#input, #upload {
width: 100%;
height: 200px;
border: 1px blue dashed;
}
#output {
width: 100%;
height: 100px;
font-size: 1em;
}
</style>
</head>
<body>
<div><input type="file" id="input"></input></div>
<div id="upload"></div>
<div><h3>Uploaded file types: </h3><textarea disabled id="output"></textarea></div>
<script>
input.addEventListener("change", () => {
sendUploadedFileTypesToApp(input.files);
});
upload.addEventListener("dragenter", event => {
event.preventDefault();
if (upload.dropEffect)
event.dataTransfer.dropEffect = upload.dropEffect;
});
upload.addEventListener("dragover", event => {
event.preventDefault();
if (upload.dropEffect)
event.dataTransfer.dropEffect = upload.dropEffect;
});
upload.addEventListener("drop", event => {
sendUploadedFileTypesToApp(event.dataTransfer.files);
event.preventDefault();
});
function sendUploadedFileTypesToApp(files)
{
output.value = Array.from(files).map(file => file.type).sort().join(", ");
}
</script>
</body>
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