表单提交邮件重复

Question

我使用ajax和jquery提交我的表单，但问题是每次表单提交时都会重复出现错误消息。可能是什么问题呢 ？

js file

$(document).ready(function(e){
    $("#checkit").click(function(){
 var ID = $("#certcode").val();


      $.ajax({
    type: "POST",
    url: "/icac/cert-check-ajax.php",
    data: 'z='+ ID,
    success: function(data) {
          $("#datadisp").append(data);

         $('#certcode').val('');
         return false;
    }

        }); 
});
});

php

<?php 
 include('/includes/db-connect.php');

if (!empty($_POST["z"]) ) {
    $z = $_POST["z"];
$result=mysqli_query($con,"SELECT * FROM `certificate_acheived_tbl` WHERE `cert_check_code` = '$z'");

if( mysqli_num_rows($result) == 1) {   


           echo '<div id="datadisp" class="alert alert-success" role="alert">Certificate Found</div';


}

    else {     echo '<div id="datadisp" class="alert alert-warning" role="alert">Invalid Security Code</div>';}
}
?>

Answer 1

我解决了   $（ “＃datadisp”）空（）。           $（ “＃datadisp”）HTML（数据）;