Exemplo validação com javascript
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EXEMPLO VALIDAÇÃO COM JAVASCRIPT<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>valida form</title>
</head>
<body leftmargin="10" topmargin="10" marginwidth="10" marginheight="10">
<h1>VALIDA FORM</h1>
<form name="cadastro" action="teste.php" method="post" onSubmit="return validaForm()"> <table width="40%" border="1" cellpadding="5" cellspacing="0" bordercolor="#000000"> <tr> <td>nome:</td> <td><input name="nome" type="text"></td> </tr> <tr> <td>user:</td> <td><input name="user" type="text"></td> </tr> <tr> <td>senha:</td> <td><input name="senha" type="password"></td> </tr> <tr> <td>email:</td> <td><input name="email" type="text"> (xxx@xx.xx)</td> </tr> <tr> <td>telefone:</td> <td><input name="telefone" type="text"></td> </tr> <tr> <td>Data de nascimento:</td> <td><input name="nasce" type="text"> (dd/mm/yyyy)</td> </tr> <tr> <td>Sexo :</td> <td> <input name="sexo[]" type="radio" value="masculino" id="sexo"> Masculino <input name="sexo[]" type="radio" value="feminino" id="sexo"> Feminino </td> </tr> <tr> <td colspan="2"> <div align="right"> <input name="enviar" type="submit" value="enviar"> </div> </td> </tr> </table>
</form>
</body>
</html>
javascript.js
<script language="JavaScript">