php - javascript function always returns false -


this question has answer here:

i trying validate html form using jquery,ajax , php. i've written function in jquery checks availability of username using ajax post request.however, problem is returning false. i'm new jquery , javascript. i've tried quite bit i'm unable figure out problem. please help.

function isvalid_username() { var username=$('#username').val(); var option=false;         if(username == "")         {             $('#username').removeclass('valid').addclass('invalid');             $('#username_feedback').addclass('error').html("please choose username!!");             option=false;         }         else if(username.length < 4)         {             $('#username').removeclass('valid').addclass('invalid');             $('#username_feedback').addclass('error').html("your username must atleast 4 characters.");             option=false;         }         else         {             $.post('php/check_username_avail.php',{ username : username },function(data){                  if(data == "false")                 {                      $('#username').removeclass('valid').addclass('invalid');                     $('#username_feedback').addclass('error').html("sorry! username taken. try different one.");                     option= false;                 }                 else if(data == "true")                 {                     $('#username').removeclass('invalid').addclass('valid');                     $('#username_feedback').html("");                     alert('now should return true');                      option=true;                 }                 else                 {                     $('#username').removeclass('valid').addclass('invalid');                     $('#username_feedback').addclass('error').html(data);                     option=false;                 }             }).error(function(){                 alert("an error occurred. unable validate username");             });         }         return option; }

edit: i've read other post. still don't find way validate form. want use submit handler function code:

$('#signup_form').submit(function(event) {   if(isvalid_first_name() && isvalid_username() && isvalid_email() && isvalid_password())   {     alert('submitting form');   }   else   {    event.preventdefault();    $('#submit_feedback').html("please correct above problems first");   }  });

if can't done way, other technique should use validate form on clientside?

well because not waiting ajax complete , returning option right away false. try below code.

    function isvalid_username(){       var username=$('#username').val();       var option=false;         if(username == "")         {             $('#username').removeclass('valid').addclass('invalid');             $('#username_feedback').addclass('error').html("please choose username!!");              return option;         }         else if(username.length < 4)         {             $('#username').removeclass('valid').addclass('invalid');             $('#username_feedback').addclass('error').html("your username must atleast 4 characters.");              return option;         }         else         {             $.post('php/check_username_avail.php',{ username : username },function(data){                  if(data == "false")                 {                      $('#username').removeclass('valid').addclass('invalid');                     $('#username_feedback').addclass('error').html("sorry! username taken. try different one.");                      return option;                 }                 else if(data == "true")                 {                     $('#username').removeclass('invalid').addclass('valid');                     $('#username_feedback').html("");                     alert('now should return true');                     option=true;                     return option;                 }                 else                 {                     $('#username').removeclass('valid').addclass('invalid');                     $('#username_feedback').addclass('error').html(data);                      return option;                 }             }).error(function(){                 alert("an error occurred. unable validate username");             });         } }

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