Question

我的上一个问题并不清楚所以我在这里发布了所有澄清的问题。在下面的代码中，我想使用jQuery显示注册表单错误的错误消息。问题在于此代码只是将数据插入数据库而不检查任何错误或显示错误消息并重定向到登录页面。那么我哪里出错了？

现在我已经更新了我的代码，除非所有条件都按照我的要求完成，但是没有提交数据，但是在点击提交按钮时会显示错误，register.php页面会重新加载，现在它只显示错误消息而没有注册表单就像没有使用jQuery一样。我不想重新加载页面它应该在那里显示错误消息。

<?php
if(isset($_POST['reg'])){
 $fn = ucfirst($_POST['fname']);
 $ln = ucfirst($_POST['lname']);
 $un = $_POST['username'];
 $em = $_POST['email'];
 $pswd = $_POST['password'];
 $pswd2 = $_POST['password2'];

 $sql=$db->prepare("SELECT username FROM users WHERE username=:username");
 $sql->execute(array(':username'=>$un));
 $row = $sql->fetch(PDO::FETCH_ASSOC);
 $db_username = $row['username'];
 $usernames = $db_username;

 $data = array();
 if( isset($fn) && isset($ln) ) {
  if( $fn != "" && $ln!="" && $fn == $ln ) {
    $data["flname"] = "cntbempty";
   }
  }
 if( isset($un) ) {
  if $un == $usernames )  {
    $data["username"] = "inuse";
   }
  }
 if( isset($pswd) && isset($pswd2) ) {
  if( $pswd2 != "" && $pswd != $pswd2 ) {
    $data["password"] = "missmatch";
   }
  }
  if( isset( $em ) ) {
   if( $em != "" && !preg_match( "/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/", $_POST["email"] ) ) {
     $data["email"] = "notvalid";
   }
  }
 if(!empty($data))
 {
 echo json_encode($data);
 die;
 }
  else{

  $pswd = password_hash($pswd, PASSWORD_DEFAULT);
  $pswd2 = password_hash($pswd2, PASSWORD_DEFAULT);
  $stmt = $db->prepare("INSERT INTO users (username,first_name,last_name,email,password,password2,) VALUES (:username,:first_name,:last_name,:email,:password,:password2,)");  
  $stmt->execute( array(':username'=>$un,':first_name'=>$fn,':last_name'=>$ln,':email'=>$em,':password'=>$pswd,':password2'=>$pswd2));
  }
  if ($stmt->rowCount() == 1) {
    header("Location: login.php");
  } 
  else {
    echo "error";
  }
}
?>

jquery代码

$(document).ready(function(){
  $("form.register").change(function() {
    $.post("register.php", $("form.register").serialize(), function( data ) {
      if( data.flname == "cntbempty" )
        $("p#name_error").slideDown();
      else
        $("p#name_error").hide();
      if( data.username == "inuse" )
        $("p#username_error").slideDown();
      else
        $("p#username_error").hide();
      if( data.password == "missmatch" )
        $("p#password_error").slideDown();
      else
        $("p#password_error").hide();
      if( data.email == "notvalid" )
        $("p#email_error").slideDown();
      else
        $("p#email_error").hide();
    }, "json");
  });
});

Answer 1

你需要解决一些问题。

首先，处理注册过程的文件不应与表单相同。
它纯粹用于处理数据，因此无法使用header("Location: login.php")直接重定向浏览器。此部分应由您的javascript代码处理。
您还需要告诉浏览器正在提供的内容是JSON。
您还需要阻止表单直接提交

查看以下更新的代码。

创建一个名为的文件： registrationHandler.php

<?php
 if(isset($_POST['reg'])){
   $fn = ucfirst($_POST['fname']);
   $ln = ucfirst($_POST['lname']);
   $un = $_POST['username'];
   $em = $_POST['email'];
   $pswd = $_POST['password'];
   $pswd2 = $_POST['password2'];

   $sql=$db->prepare("SELECT username FROM users WHERE username=:username");
   $sql->execute(array(':username'=>$un));
   $row = $sql->fetch(PDO::FETCH_ASSOC);
   $db_username = $row['username'];
   $usernames = $db_username;

   $data = array();
   if( isset($fn) && isset($ln) ) {
    if( $fn != "" && $ln!="" && $fn == $ln ) {
      $data["flname"] = "cntbempty";
    }
  }
  if( isset($un) ) {
    if $un == $usernames )  {
  $data["username"] = "inuse";
}
}
if( isset($pswd) && isset($pswd2) ) {
  if( $pswd2 != "" && $pswd != $pswd2 ) {
    $data["password"] = "missmatch";
  }
}
if( isset( $em ) ) {
 if( $em != "" && !preg_match( "/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/", $_POST["email"] ) ) {
   $data["email"] = "notvalid";
 }
}
if(!empty($data))
{
  header('Content-Type: application/json');
  echo json_encode($data);
  die;
}
else{

  $pswd = password_hash($pswd, PASSWORD_DEFAULT);
  $pswd2 = password_hash($pswd2, PASSWORD_DEFAULT);
  $stmt = $db->prepare("INSERT INTO users (username,first_name,last_name,email,password,password2,) VALUES (:username,:first_name,:last_name,:email,:password,:password2,)");  
  $stmt->execute( array(':username'=>$un,':first_name'=>$fn,':last_name'=>$ln,':email'=>$em,':password'=>$pswd,':password2'=>$pswd2));
}
//! Send Success Status to browser for it to understand
if ($stmt->rowCount() == 1) {
  $data['success'] = true;
} 
else {
  $data['success'] = false;
}
header('Content-Type: application/json');
echo json_encode($data);
}
?>

您的Javascript代码：

$(document).ready(function(){
      $("form.register").submit(function(e) {
        e.preventDefault();
        $.post("registrationHandler.php", $("form.register").serialize(), function( data ) {
          if( data.flname == "cntbempty" )
            $("p#name_error").slideDown();
          else
            $("p#name_error").hide();
          if( data.username == "inuse" )
            $("p#username_error").slideDown();
          else
            $("p#username_error").hide();
          if( data.password == "missmatch" )
            $("p#password_error").slideDown();
          else
            $("p#password_error").hide();
          if( data.email == "notvalid" )
            $("p#email_error").slideDown();
          else
            $("p#email_error").hide();

          if(data.success) {
            // registration succesful. Redirect
            window.location = "login.php";
          }
          else {
            // Some database error?
          }
        }, "json");
      });
    });

Answer 2

正如@Novocaine所提到的，你在这里提出的问题是，在你的$data填写错误后让脚本继续播放。

对我来说，简单的做法是将$data作为一个空数组初始化，然后只有在确实存在错误时才填充它。

//changing the init of the $data array
$data = array();
if( isset($fn) && isset($ln) ) {
 if( $fn != "" && $ln!="" && $fn == $ln ) {
   $data["flname"] = "cntbempty";
  }
}
/* List of all your validation tests */

//Now your test if you have any errors in your $data
if(!empty($data))
{
    echo json_encode($data);
    die;
}

//And only after if the condition is not met, you can insert and redirect
/* Rest of your code here */

您还需要在jQuery代码中添加一个条件，以检查是否data.flname和其他字段已定义。

//example
if( data.flname && data.flname == "cntbempty" )
    $("p#name_error").slideDown();

我希望这会有所帮助。

Answer 3

在header('Content-Type: application/json');

之前添加echo json_encode($data);

$(document).ready(function(){
  $("form.register").submit(function(e) {
    e.preventDefault();
    $.post("register.php", $("form.register").serialize(), function( data ) {
      if(data.length == 0){
        window.location.href= "login.php";
      }

      if( data.flname == "cntbempty" )
        $("p#name_error").slideDown();
      else
        $("p#name_error").hide();
      if( data.username == "inuse" )
        $("p#username_error").slideDown();
      else
        $("p#username_error").hide();
      if( data.password == "missmatch" )
        $("p#password_error").slideDown();
      else
        $("p#password_error").hide();
      if( data.email == "notvalid" )
        $("p#email_error").slideDown();
      else
        $("p#email_error").hide();
    }, "json");
  });
});

用echo（json_encode（array（）））

替换header("Location: login.php");

Answer 4

只需重新编写代码，然后尝试一下。

<?php
 if(isset($_POST['reg'])){
   $fn = ucfirst($_POST['fname']);
   $ln = ucfirst($_POST['lname']);
   $un = $_POST['username'];
   $em = $_POST['email'];
   $pswd = $_POST['password'];
   $pswd2 = $_POST['password2'];

   $sql=$db->prepare("SELECT username FROM users WHERE username=:username");
   $sql->execute(array(':username'=>$un));
   $row = $sql->fetch(PDO::FETCH_ASSOC);
   $db_username = $row['username'];
   $usernames = $db_username;

   //$data = array();
     $data = 0;
   if( isset($fn) && isset($ln) ) {
    if( $fn != "" && $ln!="" && $fn == $ln ) {
      // $data["flname"] = "cntbempty";
         $data = 2;
    }
  }
  if( isset($un) ) {
    if $un == $usernames )  {
     // $data["username"] = "inuse";
        $data = 3;
}
}
if( isset($pswd) && isset($pswd2) ) {
  if( $pswd2 != "" && $pswd != $pswd2 ) {
    // $data["password"] = "missmatch";
       $data = 4;
  }
}
if( isset( $em ) ) {
 if( $em != "" && !preg_match( "/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/", $_POST["email"] ) ) {
   // $data["email"] = "notvalid";
      $data = 5;
 }
}
/* if(!empty($data))
{
  header('Content-Type: application/json');
  echo json_encode($data);
  die;
}
else{ */ 

  $pswd = password_hash($pswd, PASSWORD_DEFAULT);
  $pswd2 = password_hash($pswd2, PASSWORD_DEFAULT);
  $stmt = $db->prepare("INSERT INTO users (username,first_name,last_name,email,password,password2,) VALUES (:username,:first_name,:last_name,:email,:password,:password2,)");  
  $stmt->execute( array(':username'=>$un,':first_name'=>$fn,':last_name'=>$ln,':email'=>$em,':password'=>$pswd,':password2'=>$pswd2));
// }
//! Send Success Status to browser for it to understand
if ($stmt->rowCount() == 1) {
  // $data['success'] = true;
     $data = 1;
} 
else {
  // $data['success'] = false;
  $data = -1;
}
// header('Content-Type: application/json');
// echo json_encode($data);

echo $data;

}
?>

和你的jquery脚本

$(document).ready(function(){
  $("form.register").change(function() {

   var data = new FormData(this);

    $.ajax({
        type:"post",
        url: register.php,
        data:data,
        mimeType:"multipart/form-data",
        contentType: false,
        cashe: false,
        processData: false,
        error:function(data){
            alert ("An Error has Occured...");
            return false;
        },
        beforeSend: function() {
            $('#Loading').html('<img src="images/page-loader.gif" />&nbsp;&nbsp;Processing</div>');

        },
        success: function(html){
            switch($html){
                case 1:
                      alert("success");
                       window.location.href="" /* your redirect page*/;
                      break;
                      case 2:
                        $("#error").html('Field cannot be Empty !!!');
                      break;
                      case 3:
                        /* so on...*/
                      break;
                      case 4:
                      break;
                      case 5:
                      break;

            }
        }
    });
  });
});

Answer 5

在传递给服务器之前，在浏览器上验证必填字段。然后，您只需要验证所选的用户名是否未被使用。并且用户不必等待回发以获得验证结果。

function isValidEmailAddress(emailAddress) {
        var pattern = new RegExp(/^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/);
        return pattern.test(emailAddress);
}

$(function(){

    $('form.register').submit(function(e){
        e.preventDefault();
        var errors = false;
        if($('#fname').val().length == 0){
            $('p#name_error').slideDown();
            errors = true;
        }else{
            $('p#name_error').slideUp();
        }

        if($('#lname').val().length == 0){
            $('p#name_error').slideDown();
            errors = true;
        }else{
            $('p#name_error').slideUp();
        }

        if($('#username').val().length == 0){
            $('p#username_error').slideDown();
            errors = true;
        }else{
            $('p#username_error').slideUp();
        }

        if(!isValidEmailAddress($('#email').val())){
            $("p#email_error").slideDown();
            errors = true;
        }else{
            $("p#email_error").hide();
        }

        if($('#password').val().length == 0){
            $("p#password_error").slideDown();
            errors = true;
        }else{
            $("p#password_error").hide();
        }

        if($('#password2').val().length == 0){
            $("p#password_error").slideDown();
            errors = true;
        }else{
            $("p#password_error").hide();
        }

        if($('#password').val() != $('#password2').val()){
            $("p#password_error").slideDown();
            errors = true;
        }else{
            $("p#password_error").hide();
        }

        if(errors){
            return;
        } 

        $.post("register.php", $("form.register").serialize(), function( data ) {
            if(data.length == 0){
                window.location.href= "login.php";
            }
            if( data == "inuse" ){
                $("p#username_error").slideDown();
            }
        }
    });
});

PHP：

<?php
    if(isset($_POST['reg'])){
        $fn = ucfirst($_POST['fname']);
        $ln = ucfirst($_POST['lname']);
        $un = $_POST['username'];
        $em = $_POST['email'];
        $pswd = $_POST['password'];
        $pswd2 = $_POST['password2'];

        $sql=$db->prepare("SELECT username FROM users WHERE username=:username");
        $sql->execute(array(':username'=>$un));
        $row = $sql->fetch(PDO::FETCH_ASSOC);
        $db_username = $row['username'];
        $usernames = $db_username;

        $data = "";
        if $un == $usernames )  {
            $data = "inuse";
        }
        if(strlen($data) == 0){
            $pswd = password_hash($pswd, PASSWORD_DEFAULT);
            $pswd2 = password_hash($pswd2, PASSWORD_DEFAULT);
            $stmt = $db->prepare("INSERT INTO users        (username,first_name,last_name,email,password,password2,) VALUES (:username,:first_name,:last_name,:email,:password,:password2,)");  
            $stmt->execute( array(':username'=>$un,':first_name'=>$fn,':last_name'=>$ln,':email'=>$em,':password'=>$pswd,':password2'=>$pswd2));
        }
        echo data;
    }
?>

Answer 6

试试这个

 <script>

  // When the browser is ready...
  $(function() {

    $("#your form ID").validate({

        // Specify the validation rules
        rules: {
                   fname:"required",
                   lname: "required",
                   username: "required",
                   email: "required",
                   password: "required"
            } 

 });
 $('#your form ID').submit(function(e){     
         e.preventDefault();
            var $form = $(this);
            if(! $form.valid()) return false;
         var data = $( "#your form ID" ).serialize();
            $.ajax({
            type:"POST",
            url:"",
            data:data,
            success:function(data)
            {
                   console.log(data);

            }
        });
        });
 });
</script>

有关详细信息，请阅读本教程http://w3code.in/2015/10/submit-a-form-with-ajax-after-jquery-validation-is-successful/

Answer 7

.html文件

请添加显示错误的不同错误字段，并将其标识为：

#nameerr,#emailerr,,#passerr,#confirmpasserr

.css文件

在这个css文件中，我们提供隐藏的所有错误ID可见性，如果需要，也可以使用display。

#nameerr,#emailerr,#passerr,#confirmpasserr{
     color: red;
     background-color:#FFB2B2;
     visibility : hidden;
     font-weight:bold;
     font-size: 12px;
     box-shadow: 0 0 5px rgba(255, 0, 0, 1);


 }

.js文件：

当你使用提交时，如果特定要求没有填写，那么它显示错误!!

 $(document).ready(function()
      {
        $('#submit').click(function()
          {
            var uname = $('#name').val();
            if($('#name').val().match('[a-zA-Z]+\\.?')) {
              $("#nameerr").css("visibility", "hidden");

            }
            else {

              $("#nameerr").text("Name is InValid");
              $("#nameerr").css("visibility", "visible");
              return false;

            }

          }
        );    

        $('#submit').click(function()
          {
            var email = $('#email').val();
            if($('#email').val().match('[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}')) {
              $("#emailerr").css("visibility", "hidden");
            }
            else
            {
              $("#emailerr").text("Email Address is InValid.");
              $("#emailerr").css("visibility", "visible");

              return false;

            }

          }
        );



        $('#submit').click(function()
          {
            var email = $('#pass').val();
            if($('#pass').val().length<5) {
              $("#passerr").text("Minimum length should be 5");
              $("#passerr").css("visibility", "visible");
              return false;
            }
            else {
              $("#passerr").css("visibility", "hidden");

            }

          }
        );

     $('#submit').click(function(){

    var confirmpass = $('#confirmpassword').val();


    if($('#password').val() != $('#confirmpassword').val()) {
        $("#confirmpasserr").text("Password doesnt match");
      $("#confirmpasserr").css("visibility", "visible");
      return false;
    }
     else {
      $("#confirmpasserr").css("visibility", "hidden");

    }

});



        $('#email').on("blur", function()
          {

            if($('#err').val.match($msg)) {

              $("#err").text($msg);
              $("#err").css("visibility", "visible");

            }
            else {

              $("#err").css("visibility", "hidden");
            }

          }
        );
      }
    );

在提交注册表单时使用jQuery显示错误

7 个答案: