<html>
<body>
<script language="JavaScript">
function checkFiles(){
if (document.secret.file1.value == ""){
console.log("You did not enter anything for file 1");
}
if (document.secret.file2.value == ""){
console.log("You did not enter anything for file 2");
}
else {
console.log("The files are okay and will be uploaded");
}
}
</script>
<form name="secret">
Please choose two files to upload.
<br><br>
File 1:<input type="file" name="file1">
<br><br>
File 2:<input type="file" name="file2">
<br><br>
<input type="button" value="Verify" onClick='checkFiles()'>
</form>
</body>
</html>
【file_upload】
