Adaugare cod de securitate la formular HTML

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In acest tutorial este prezentat modul prin care putem adauga unui formular un cod de securitate, al carui scop este oprirea trimiterii mesajelor spam.

In principiu, formularul contine un camp in care este introdus un anumit cod. Acel cod trebuie comparat cu un altul iar in cazul in care sunt identice sa trimita datele prin formular.

Acest mod consta in adaugarea unei casute ascunse de tip text a carei valoare este rezultatul corect al operatiei matematice sau intrebarii sau ce doriti voi sa apara la codul de securitate.

Cod: Selectaţi tot

<form action="pagina.php" method="post" onsubmit="return validare()" 
name="formular" >
Nume:
<input type="text" size="25" name="nume" maxlength="35" />
Mesaj:
<textarea name="mesaj"></textarea>
<?php
 $aleatoriu1 = rand(0,10);
 $aleatoriu2 = rand(0,10);
 $rezultat = $aleatoriu1 + $aleatoriu2;

echo '<input type="text" size="5" value="'.$rezultat.'" name="cod1" 
style="display:none;" />
'.$aleatoriu1.'+'.$aleatoriu2.' =
<input type="text" size="5" name="cod2" />';
?>
<input type="submit" value="Trimite" />
</form>
Iar codul javascript care verfica daca valoarea celor doua casute este aceeasi

Cod: Selectaţi tot

function validare() {
 if (document.forms.formular.cod1.value != document.forms.formular.cod2.value) {
	alert('Introduceti codul de verificare!');
	return false;	
 }
 return true;
}
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