The value property specifies the filename of the file selected or input by the user.
<html>
<head>
<title>Using the value property of the FileUpload object</title>
</head>
<body>
<script language="JavaScript">
<!--
function showFile(){
var input = document.form1.uploadbox.value;
alert("The filename entered is: " + input);
}
-->
</script>
<form name="form1">
Please select a file.
<input type="file" name="uploadbox">
<br><br>
Click on the button to see the value of the FileUpload object.
<br>
<input type="button" value="Submit" onClick=showFile()>
</form>
</body>
</html>