📄 login.html
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<html>
<head>
<style>
body { font-family: Verdana; font-size: 18; font-weight: bold; color: red; text-align: center; }
input { font-family: Verdana; font-size: 16; }
</style>
<script>
function checkInput() {
var input_field = document.getElementById("name");
var input = input_field.getAttribute("value");
if (input.length == 0) {
alert("Please enter a name!");
return false;
}
var reg = new RegExp("\\W");
if (input.match(reg)) {
alert("Invalid user name!\nPlease don't use space and the following characters.\n\"\':;<>()[]{}!@#$%^&*-+=");
return false;
}
return true;
}
</script>
</head>
<body bgcolor="#CCCCFF">
<form method="POST" action="login.php" onsubmit="return checkInput();">
<p>
Please enter your user name:
<input name="name" id="name" type="text" size="10" maxlength="10" />
<select name="agentname">
<option selected>Merlin</option>
<option>Peedy</option>
<option>Genie</option>
<option>Robby</option>
</select>
</p>
<input type="submit" value="Go!">
</form>
</body>
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