check file size js
<!DOCTYPE html>
<html>
<head>
<title>File Validation-1</title>
</head>
<body>
<p>
<input type="file"
id="file"
onchange="Filevalidation()" />
</p>
<p id="size"></p>
</body>
<script>
Filevalidation = () => {
const fi = document.getElementById('file');
// Check if any file is selected.
if (fi.files.length > 0) {
for (const i = 0; i <= fi.files.length - 1; i++) {
const fsize = fi.files.item(i).size;
const file = Math.round((fsize / 1024));
// The size of the file.
if (file >= 4096) {
alert(
"File too Big, please select a file less than 4mb");
} else if (file < 2048) {
alert(
"File too small, please select a file greater than 2mb");
} else {
document.getElementById('size').innerHTML = '<b>'
+ file + '</b> KB';
}
}
}
}
</script>
</html>
