Confused on jquery .ajax .done() function -


i'm bit confused on how use ajax .done() function. i'm working on validating form check if user exists in database , though ajax best approach (still learning it). have php file return true if user exists , false if user doesn't exist. how pass boolean parameter done function?

$(".check").blur(function(){   var username = $(".check").val();   $.ajax({     url: "validateuser.php",     type: "post",     data: "username= " + username   }).done(function(result){     if (result == true){       // user exists     }else{       // user doesn't exist     }   }); });

i hope made sense. did best explain it.

i think should result == 'true' result data string

i checked, correct, quotes make work

php:

<?php  if($_post['username']=='sambob'){echo 'true';}else{echo 'false';}  ?>

javascript

username='sambob';  $(".check").blur(function(){   $.post("validateuser.php", { username: username })   .done(function(data) {      if (data == 'true'){         alert("user exists");      }else{         alert("user doesn't exist");       }   }); });

json php

<?php  if($_post['username']=='sambob'){echo'{"exists":true}';}                             else{echo'{"exists":false}';} ?>

json javascript

$(".check").blur(function(){    $.post("validateuser.php", { username : username },    function(user){       if (user.exists == true){          alert("user exists");       }else{          alert("user doesn't exist");       }    }, "json"); });

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