Upload file checker
check if form field contains somthing.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>javascript image upload checker</title>
</head>
<body>
<script language="javascript">
<!--
function checkchars(cur) {
var maxlength=1
if (cur.file1.value.length<maxlength) {
alert("You must select a file to upload!");
return false;
}
return true;
}
//-->
</script>
<form onsubmit="return checkchars(this)">
<input type="file" name="file1"><br>
<input type="submit" value="Submit!">
</form>
</body>
</html>
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