javascript - ajax - Verifying if a row already exist in the database -


i have simple form submitting email address database. want check first, using javascript , ajax, if email address exists in table. code using returns true regardless if row exists in database. hints?

js code

<script>  $('form').submit(function(e)  {   alert('submit intercepted');   e.preventdefault(e);   var u = $('#email').val();   $.ajax({       url: './test2.php',       type: 'post',       data: u,       success: function (response) {       //get response php page (what echo or print)         $('#status').append('<p>the email ok use , row has been inserted </p><p>' + response);         console.log('submitted');       },       error: function(jqxhr, textstatus, errorthrown) {         console.log(textstatus, errorthrown);         alert('email exists');       }     }); }); </script>

html code

<form id="form" action="./test2.php" method="post">      e-mail: <input type="email" name="email" id="email" required><br>     <span id="status">   </span>     <input type="submit" id="btnsub">   </form>

php code

if(isset($email)) {    $sql_email_check = $conn->query("select email test email='$email' limit 1") ;    $email_check = $sql_email_check->num_rows;    if ($email_check < 1) {      //return "available";     return true;        //header('location: /test.php');     exit();    }    else    {     //return "unavailable";     return false;     //header('location: /test.php');     exit();     } }

returning true , false in php outputs nothing in browser. try this:

header('content-type: application/json'); if (isset($email)) {   $sql_email_check = $conn->query("select email test email='$email' limit 1") ;   $email_check = $sql_email_check->num_rows;   if ($email_check < 1) {     echo json_encode(['status' => 1]);     die();   }  }  echo json_encode(['status' => 0]);

then, in javascript code, this:

success: function (response) {   if (response.status === 1) {     $('#status').append('<p>the email ok use , row has been inserted </p><p>' + response);   } else {     alert('email exists');   } },

btw, should use prepared statements. have no idea if query works or not, root of problem in original question echoing true or false not work expect.


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