Validate html form with javascript -


i want validate user input javascript before sending data server, when try browser doesn't display alert message.

i cannot find problem. please me. thank you!

my html:

    <title>login page</title>      <script type="text/javascript" src="../js/functions.js"></script>  </head>  <body>      <div id="content">           <form name="signin_form"  action="../processes/login_process.php" onsubmit="return checklogindata()"  method="post">            <h1>accesso utente</h1>            <p>              <label for='tf_nick'>nick</label>              <input type='text' id='tf_nick' name='tf_nick' value="">               <label for='tf_password'>password</label>              <input type='password' id='tf_password' name='tf_password' value=''>               <input type='submit' value='ok'>              <input type='reset' value='pulisci'>            </p>          </form>       </div>  </body>

my javascript:

    function checklogindata(){          var formobj = document.signin_form;              var nick    = "" + formobj.tf_nick.value;         var pass    = "" + formobj.tf_password.value;          if ( nick == "" ) {             alert("inserisci il nick per accedere!");             return false;          } else if ( pass == "" ) {             alert("inserisci la password per accedere!");             return false;          } else {              var regexnick = /(?=.*[0-9])(?=.*[a-za-z%])^[a-za-z0-9%]{3,6}$/;                     var regexpass = /(?=.*[a-z])(?=.*[a-z])^[a-za-z]{4,8}$/;              if ( !regexnick.test(nick) ){                 alert("nick non valido!");                 return false;              } else if ( !regexpass.test(pass) ) {                 alert("password non valida!");                 return false;              } else {                 return true;             }         }     }

this file system:

main_folder/pages/login.php main_folder/js/functions.js

i created jsfiddle copy/pasted code , there works fine: http://jsfiddle.net/872d6ssn/1/ (code included below because stackoverflow demands that, it's copy)

are sure include js file in correct way? seems you're not including file @ all.

html 

      <h1>accesso utente</h1>        <p>          <label for='tf_nick'>nick</label>          <input type='text' id='tf_nick' name='tf_nick' value="">           <label for='tf_password'>password</label>          <input type='password' id='tf_password' name='tf_password' value=''>           <input type='submit' value='ok'>          <input type='reset' value='pulisci'>        </p>      </form>

javascript

  function checklogindata(){     var formobj = document.signin_form;          var nick    = "" + formobj.tf_nick.value;     var pass    = "" + formobj.tf_password.value;      if ( nick == "" ) {         alert("inserisci il nick per accedere!");         return false;      } else if ( pass == "" ) {         alert("inserisci la password per accedere!");         return false;      } else {          var regexnick = /(?=.*[0-9])(?=.*[a-za-z%])^[a-za-z0-9%]{3,6}$/;                 var regexpass = /(?=.*[a-z])(?=.*[a-z])^[a-za-z]{4,8}$/;          if ( !regexnick.test(nick) ){             alert("nick non valido!");             return false;          } else if ( !regexpass.test(pass) ) {             alert("password non valida!");             return false;          } else {             return true;         }     } }

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