<!DOCTYPE html>
<html>
<head>
<script>
function formGecisi() {
var x = document.forms["Form1"]["kullanici_adi"].value;
if (x == null || x == "") {
alert("Boş Alanları Doldurunuz.");
return false;
}
}
</script>
</head>
<body>
<form name="Form1" action="demo_form.php" onsubmit="returnformGecisi()" method="post">
Name: <input type="text" name="kullanici_adi">
<input type="submit" value="Submit">
</form>
</body>
</html>
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