validar campo text numero y/o letras

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Muchisimas gracias, al parecer era algo tan sencillo, pero cuando uno se bloquea se bloquea..

Iniciado por David el Grande

Si lo único que vas a validar es que no esté vacío sería algo así:

Código PHP:

  function valboleto(){                                                            
    var x;                                                                       
    var cont=0;                                                                  
    ok=document.getElementsByName("boleto");                                     
    for(x=0; x < ok.length; x++)                                                 
    {                                                                            
       if(ok[x].value != ""){                                                      
          cont=cont+1;                                                           
       }                                                                         
    }                                                                            
    if(cont > 0)                                                                 
    {                                                                            
       return true;                                                              
    }                                                                            
    else                                                                         
    {                                                                            
       alert("Campo vacío");  
       return false;                                                             
    }                                                                            
}