如何使用 Ajax 和 PHP 将表单数据输入数据库

Question

我想使用 ajax 获取表单数据，然后将其提交到我的 php 页面，然后将其插入到我的数据库中。成功插入时，我想显示“您已成功注册”，失败时显示“注册失败”，如果您已经是会员，我会显示“已经是会员，请登录”。

由于某种原因，我的 ajax 代码无法按预期工作。它跳到最后一部分（else 语句甚至不关心 if 语句）。我的php代码是正确的。因为我已经单独测试过它并且工作正常。

有人可以为我建议一个解决方案或其他方法来完成此操作记住我不想转到另一个页面。

这是我的 JavaScript/jQuery 代码：

$(document).ready(function){
    //Signup Js
    $("#Register").click(function(){ //#Register is my submit button id
        var action = $("#sp-form").attr('action'); //#sp-form is the register form id.
        var spform_data = {
            myusername: $("#myusername").val(),
            myemail: $("#myemail").val(),
            mypassword: $("#mypassword").val() //Getting data from the input forms using their respective id's
        }

        $.ajax({
            type: "POST",
            url: action,
            data: spform_data,
            success: function(outcome)
            {
                if(outcome == "success"){
                    $("#sp-form").slideUp('slow', function(){
                        $("#message_sp").html('<p class="success">You have been registered successfully!</p><p style="color:#1c1c1c;">Redirecting....</p>');
                    });
                }
                else if(outcome == "alreadymember") {
                    $("#modal_signup").css("height","380");
                    $("#message_sp").html('<p class="error">ERROR: Email match found,Just Sign in.</p>');
                }
                else if(outcome == "failed"){
                    $("#modal_signup").css("height","380");
                    $("#message_sp").html('<p class="error">ERROR:  Failed to Register</p>');
                }
                else{
                    $("#modal_signup").css("height","380");
                    $("#message_sp").html('<p class="error">ERROR:  Unknown   ERROR</p>');
                }                
            }            
        });
        return false;
    });
});

这是我的 PHP/MySQLi 代码

<?php
if ($_POST)
{
    $host = "localhost";
    $user= "root";
    $password = " ";

    try {
        $conn = mysqli_connect($host , $user , $password) or die("unable to connect to Local Host"); //Establishing connection with the server
        $sql = mysqli_select_db($conn,'audacity') or die("unable to connect to database"); //selecting a database from the server #after connecting
    } catch (Exception $e) {
        echo $e->getMessage();
    }
    $name = mysqli_real_escape_string($conn,$_POST['myusername']);
    $mail = mysqli_real_escape_string($conn,$_POST['myemail']);
    $pass = mysqli_real_escape_string($conn,$_POST['mypassword']);

    // Query of SQL
    $Query =mysqli_query($conn,"INSERT INTO  registration (Username,Email,Password) VALUES ('$name', '$mail' , '$pass')")) //if successful outcome is true
    if($Query ==true){
        echo "success";
    }
    elseif ($Query==false) {  #if failed
        $sqlbd = "SELECT Email FROM registration WHERE Email='$mail' ";
        $result = mysqli_query($conn,$sqlbd);

        if(mysqli_num_rows($result)==1){  //possible rsn for failure
            echo "alreadymember";             
        }
        else{
            echo "failed";  //unknown reason.
        }
    }
    mysqli_close($conn);
?>

问题出在哪里？？？

Answer 1

我认为您必须在 ifs 语句的开头检查 num_rows 是否 ==1...您的 php 只需输入电子邮件然后检查 num 行作为 else 语句...您首先检查 num 行然后设置 if 语句或者您已经为您的电子邮件栏设置了唯一性？

Answer 2

我可以确认您的代码有很多错误。 我附上了代码的更正版本；但是，我会假设（从 php 代码）目标是防止多次注册；如果是这种情况，则应检查您的逻辑。您在检查之前插入，因此检查代码永远不会运行。因此，在尝试插入之前进行检查。整体代码似乎不太好。 我只修复了错误，你应该处理逻辑。

JQuery $(document).ready(function () {

            $("#sp-form").submit(function (e) {
                return false;
            });
            $("#Register").click(function () {
                var action = $("#sp-form").attr('action'); //#sp-form 
is the register form id.

                var spform_data = {
                    myusername: $("#myusername").val(),
                    myemail: $("#myemail").val(),
                    mypassword: $("#mypassword").val()         
//Getting data from the input forms using their respective id's
                }


                $.ajax({
                    type: "POST",
                    url: action,
                    data: spform_data,
                    success: function (outcome)
                    {
                        if (outcome.indexOf("success")>=0) {
                            $("#sp-form").slideUp('slow', function () {
                                $("#message_sp").html('<p 
class="success">You have been registered successfully!</p><p 
style="color:#1c1c1c;">Redirecting....</p>');
                            });
                        }
                        else if (outcome.indexOf("alreadymember")>=0) {


                            $("#modal_signup").css("height", "380");
                            $("#message_sp").html('<p 
class="error">ERROR: Email match found,Just Sign in.</p>');


                        }

                        else if (outcome.indexOf("failed")>=0) {


                            $("#modal_signup").css("height", "380");
                            $("#message_sp").html('<p 
class="error">ERROR:  Failed to Register</p>');


                        }
                        else {


                            $("#modal_signup").css("height", "380");
                            $("#message_sp").html('<p 
class="error">Unknown Error</p>');
                        }

                    }

                });
                return false;


            });
        });

// Php
 $host = "localhost";
        $user = "root";
        $password = "";
        $conn = "";
        try {
            $conn = mysqli_connect($host, $user, $password) or 
die("unable to connect to Local Host"); //Establishing connection with 
the server

            $sql = mysqli_select_db($conn, 'audacity') or die("unable 
to connect to database"); //selecting a database from the server #after 
connecting
        } catch (Exception $e) {
            echo $e->getMessage();
        }


        $name = mysqli_real_escape_string($conn, $_POST['myusername']);
        $mail = mysqli_real_escape_string($conn, $_POST['myemail']);
        $pass = mysqli_real_escape_string($conn, $_POST['mypassword']);

        // Query of SQL


        $Query = mysqli_query($conn, "INSERT INTO  registration 
(Username,Email,Password) VALUES ('$name', '$mail' , '$pass')"); //if 
successful outcome is true
        if ($Query == true) {

            echo "success";
        } elseif ($Query == false) {  #if failed
            $sqlbd = "SELECT Email FROM registration WHERE 
Email='$mail' ";
            $result = mysqli_query($conn, $sqlbd);

            if (mysqli_num_rows($result) == 1) {  //possible rsn for 
failure
                echo "alreadymember";
            } else {

                echo "failed";  //unknown reason.
            }
        }

        mysqli_close($conn);
    }