在PHP中似乎忽略了其他语句

Question

我正在创建登录信息，但我遇到了问题。如果用户输入错误的用户名和/或密码，我希望显示一条错误消息，特别是如果两者都不匹配数据库中的内容，则会提示用户他们输入了错误的用户名/密码

每当我运行代码时，似乎忽略了我的else语句。我的if语句有效，我已经测试过了。但无论我在else子句中回应什么，它都没有被访问。我已经尝试重组php绑定的js，我尝试过类似问题的Stack Overflow解决方案无济于事。我通过逐步测试代码并在if语句为真时测试了代码＆＃34; sas＆＃34;如果不是真的，那么就会被回应（否则）＆＃34;＆＃34;是的回应。控制台上没有错误消息。也许我在这里尝试的逻辑存在问题。

我使用Malsup的jQuery表单插件以异步方式提交登录表单。我已经减少了一些非必要的（我可能知道的更多）html和js，但是包含了很好的测量文件。

PHP

<p id="notice"><%= notice %></p>

<p>

<strong>Date:</strong>

<%= @report.date %>

</p>

<p>

<strong>Site:</strong>

<%= @report.site_id %>

</p>

<p>

<strong>Created By:</strong>

<%= @report.user_id %>

</p>

<p>

<strong>Type of report:</strong>

<%= @report.type_of_report %>

</p>

<p>

<strong>Type of incident:</strong>

<%= @report.type_of_incident %>

</p>

<p>

<strong>Report:</strong>

<%= @report.report %>

</p>

<%= link_to 'Edit', edit_report_path(@report) %> |

<%= link_to 'Back', reports_path %>

JS

    <?php
    $host     = "meh"; // Host name 
    $username = "blah"; // Mysql username 
    $password = "pft"; // Mysql password 
    $db_name  = "doh"; // Database name 
    $tbl_name = "leh"; // Table name 

    // Connect to server and select databse.
    $mysqli = new mysqli("$host", "$username", "$password", "$db_name");
    if ($mysqli->connect_errno) {
        echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
    }

    // username and password sent from form 
    $myusername = $_POST['myusername'];
    $mypassword = $_POST['mypassword'];

    // To protect MySQL injection
    $myusername = stripslashes($myusername);
    $mypassword = stripslashes($mypassword);
    $myusername = mysqli_real_escape_string($mysqli, $myusername);
    $mypassword = mysqli_real_escape_string($mysqli, $mypassword);
    $sql        = "SELECT FirstName, Password FROM $tbl_name WHERE FirstName= ? AND Password= ? ";
    //prepare and bind paramters
    if ($stmt = $mysqli->prepare($sql)) {
        $stmt->bind_param("ss", $myusername, $mypassword);
        $stmt->execute();
        $stmt->bind_result($returnedusername, $returnedpassword);

        //fetch $stmt results
        while ($stmt->fetch()) {
            if (isset($returnedusername) && isset($returnedpassword) && $returnedusername === $myusername && $returnedpassword === $mypassword) {
                session_register("myusername");
                session_register("mypassword");
                //header("location:login_success.php");
                echo "sas";
            } else {//I DONT THIS PART IS BEING RUN...NOT SURE THOUGH IF LOOKING AT WRONG PART OF CODE
                echo $_POST['loginError'];//loginError found in html, will be error message
            } 
        } //end while

    } //end if
    $stmt->close();
    $mysqli->close();
    ?>

HTML

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

    var  loginForm = $("#form1");

    //Will load user's name into page heading (from local storage)
    function storeUsername() {
        window.alert("You made it in the function");//testing to see if code is run
        if (typeof(Storage) != "undefined") {
            // Store the user's first name as localStorage Object
            var inputUsername = document.getElementById("myusername");
            localStorage.username = inputUsername.value;
            window.alert(localStorage.username);
        }
    }

    var options = {
        target: '#loginError',
        beforeSubmit: beforeSubmit, // pre-submit callback 
        success: afterSuccess
    };

    //Submit form via ajax
    // bind to the form's submit event 
    $('#form1').submit(function() {

        // inside event callbacks 'this' is the DOM element so we first 
        // wrap it in a jQuery object and then invoke ajaxSubmit 
        $(this).ajaxSubmit(options);

        return false;
    });

    //after succesful upload
    function afterSuccess() {

        var flag = $("#loginError");
        var flagContents = flag.html();

        if (flagContents == "sas") {
            window.location.href = "login_success.php";
            //remove the imgPlaceHolder element

        } else {
            flag.fadeIn('slow');//error message will fade In
        }
    }
    function beforeSubmit() {
        //check whether browser fully supports all File API
        if (window.File && window.FileReader && window.FileList && window.Blob) {
            storeUsername();

        } else {
            //Output error to older unsupported browsers that doesn't support HTML5 File API
            alert("Please upgrade your browser, because your current browser lacks some new features we need!");
            return false;
        }
    }
}); 

Answer 1

这就是问题所在：

<div id="loginError" name="loginError" style="display:none" value="**Username or password incorrect**"></div>

将其更改为：

<input id="loginError" name="loginError" style="display:none" value="**Username or password incorrect**" type="hidden" />