Javascript does user exists, returning value from ajax to late? -


i have script tells visitor if username exist or not before can proceed, below see part of code;

edit: ok have read guys said, , modified it, still dont work :s, teacher doesn't know either...

<script type="text/javascript"> jquery(document).ready(function(){      // smart wizard          jquery('#wizard').smartwizard({onfinish: onfinishcallback, onleavestep: onnextstep});     function onnextstep(){         validatesteps(function (next) { return next; });     }        function onfinishcallback(){         alert('finish clicked');      }      function usernameexist(fullname, callback)     {         var data = 'user='+ fullname;         if(fullname) {             $.ajax({                 type: "post",                 url: "user_check.php",                 data: data,                 async: false,                 beforesend: function(html) {                     $("#msg_lastname").html('');                 },                 success: function(html){                      $("#msg_lastname").show();                             $("#msg_lastname").append(html);                     if(html.search("red") != -1)                     {                         callback(false);                     }                     else                     {                         callback(true);                     }                 }             });         }    }     function validatesteps(callback){         var isstepvalid = true;         // validate step 1         var firstname = $('#firstname').val();        if(!firstname || (firstname.length < 3 || firstname.length > 10))        {             $('#msg_firstname').html('<br/><font color="red">enter first name, between 3 , 10 letters.</font>').show();             isstepvalid = false;        }        else        {          $('#msg_firstname').html('').hide();        }        var lastname = $('#lastname').val();        if(!lastname || (lastname.length < 3 || lastname.length > 14))        {             $('#msg_lastname').html('<br/><font color="red">enter last name, between 3 , 14 letters.</font>').show();             isstepvalid = false;        }        else        {          $('#msg_lastname').html('').hide();        }         var gender = $('#gender').val();        if(!gender || number(gender) == -1)        {             $('#msg_gender').html('<br/><font color="red">choose gender!</font>').show();             isstepvalid = false;        }        else        {          $('#msg_gender').html('').hide();        }        var age = $('#age').val();        if(!age || number(age) > 90 || number(age) < 21)        {             $('#msg_age').html('<br/><font color="red">enter age between 21 , 90.</font>').show();             isstepvalid = false;        }        else        {          $('#msg_age').html('').hide();        }        var pin = $('#pin').val();        if(!pin || pin.length > 10 || pin.length < 4)        {             $('#msg_pin').html('<br/><font color="red">enter pin between 4 , 10 numbers.</font>').show();             isstepvalid = false;        }        else        {          $('#msg_pin').html('').hide();        }        if (isstepvalid) {             usernameexist(firstname + ' ' + lastname, function (exists) {                 callback( exists );             });         } else {             callback( false );         }      }        jquery('select, input:checkbox').uniform();  }); </script>

now problem when run script, returns undefined, guess because usernameexist not done fast enough, , seems return usernameexist not waiting for reason...

you returning usernameexists before has been run.

instead, call usernameexists this:

if (isstepvalid) {     usernameexist(firstname + ' ' + lastname, function (exists) {         return exists;     }); } else {     return false; }

this works because usernameexists expects callback function , on success passes either true or false callback().


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