javascript - "Uncaught ReferenceError: fail is not defined." Why is this happening? -


i in process of making dynamic signup form.

the form has been created , various functions validating entries have been written.

however, variable have created returning error message on failure of vaildation has come in javascript console not being defined.

i've used strict methods , have stated in globals declaration defining variable within following code.

what i'm trying use javascript validate entries within form , prompt user correct errors before form submitted database.

the error code returned javascript console follows: uncaught referenceerror: fail not defined. line 5 validate.js

i've attached code html form , validation.js file, hope i've explained in way can understood.

here code validation.html:

<html> <head> <title>an example form</title> <style type="text/css"> .signup {     border: 1px solid #999999;     font: normal 14px helvetica; color: #444444; } </style> <script language="javascript" type="text/javascript" src="validate.js"></script> </head> <body> <table class="signup" cellpadding="2" cellspacing="5" bgcolor="#eeeeee"> <th colspan="2" align="center">signup form</th> <form method="post" action="adduser.php" onsubmit="validateform(this)"> <tr>     <td>forename</td>     <td><input type="text" maxlength="32" name="forename"/></td> </tr> <tr> <td>surname</td> <td><input type="text" maxlength="32" name="surname"/></td> </tr> <tr> <td>username</td> <td><input type="text" maxlength="16" name="username"/></td> </tr> <tr> <td>password</td> <td><input type="text" maxlength="12" name="password"/></td> </tr> <tr> <td>age</td> <td><input type="text" maxlength="2" name="age"/></td> </tr> <tr> <td>e-mail</td> <td><input type="text" maxlength="64" name="email"/></td> </tr> <tr> <td colspan="2" align="center"><input type="submit" value="signup"/></td> </tr> </form> </table> </body> </html>

here code validate.js:

/*jslint browser: true*/ /*global fail:true, alert:true, validateforename, validatesurname, validateusername, validatepassword, validateage, validateemail*/  function validateform(form) {     "use strict";     fail = validateforename(form.forename.value);     fail += validatesurname(form.surname.value);     fail += validateusername(form.username.value);     fail += validatepassword(form.password.value);     fail += validateage(form.age.value);     fail += validateemail(form.email.value);     if (fail === "") {         return true;     } else { alert(fail); return false;            } }  function validateforename(field) {     "use strict";     if (field === "") {         return "no forename entered.\n";     }     return ""; }  function validatesurname(field) {     "use strict";     if (field === "") {         return "no surname entered.\n";     }     return ""; }  function validateusername(field) {     "use strict";     if (field === "") {         return "no username entered.\n";     } else if (field.length < 5) {         return "usernames must @ least 5 characters.\n";     } else if (/[\^a-za-z0-9_\-]/.test(field)) {         return "only a-z, a-z, 0-9, - , _ allowed in usernames.\n";     }     return ""; }  function validatepassword(field) {     "use strict";     if (field === "") {         return "no password entered.\n";     } else if (field.length < 6) {         return "passwords must @ least 6 characters.\n";     } else if (!/[a-z]/.test(field) || !/[a-z]/.test(field) || !/[0-9]/.test(field)) {         return "passwords require 1 each of a-z, a-z , 0-9.\n";     }     return ""; }  function validateage(field) {     "use strict";     if (isnan(field)) {         return "no age entered.\n";     } else if (field < 18 || field > 99) {         return "age must between 18 , 99.\n";     }     return ""; }  function validateemail(field) {     "use strict";     if (field === "") {         return "no e-mail entered.\n";     } else if (!(((field.indexof(".") > 0) && (field.indexof("@") > 0)) || /[\^a-za-z0-9.@_\-]/.test(field))) {         return "the email address invalid.\n";     }     return ""; }

the /* global */ comment tells jslint global variables have been defined in other files.
not declare anything.

you need declare variables, using var statement.
note want locals, not globals.

in fact, shouldn't using /* global @ all, unless have globals file (which don't).
browser standard methods alert() known because of browser: true, , jslint sees declared in file.


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