Question

如果有人可以帮我解决这个问题，我真的很感激 - 我几乎让它工作了！

基本上，我正在制作自己的应用程序想法一段时间，我之所以这样做是因为我不熟悉编码，所以我觉得它会教会我很多不同的元素（即添加，更新）并删除记录）。

因此，通过此示例，我有一个用户成功登录，并且正在创建一个正在沿其他表单传递的会话。我希望他们能够增加一笔交易 - 我几乎有这笔交易，但似乎很难与一部分斗争。

我的HTML代码是：

<!DOCTYPE html>
<html>
<head>
<title>Find A Deal</title>
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0"/>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<link rel="stylesheet" href="http://localhost/findadeal/themes/deal.css" />
<style>
    #login-button {
        margin-top: 30px;
    }        
</style>
<script src="http://www.dragan-gaic.info/js/jquery-1.8.2.min.js"></script>    
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>
<script src="js/custom3.js"></script>
<script src="js/custom4.js"></script>

       <?php
    if( !isset( $_SESSION ) ){
     session_start();
        }

    if( isset( $_SESSION['username'] ) ){
      /* User is logged in */
      echo "IT WORKS!";
        } ?>

</head>


<body>
<div data-role="page" id="login">
    <div data-theme="a" data-role="header">
        <h3>Find A Deal</h3>
    </div>

    <div data-role="content">

        <label for="username">Enter your username:</label>
        <input type="text" value="" name="username" id="username"/>
        <label for="password">Enter your password:</label>
        <input type="password" value="" name="password" id="password"/>  
        <a data-role="button" id="login-button" data-theme="b">Login</a>
    </div>

    <div data-theme="a" data-role="footer" data-position="fixed">

    </div>
</div>

<!--Newly rendered page after successful login!-->

<div data-role="page" id="index">
    <div data-theme="a" data-role="header">
        <h2>Find A Deal</h2>
    </div>

    <div data-role="content">

           <?php
    if( !isset( $_SESSION ) ){
     session_start();
        }

    if( isset( $_SESSION['username'] ) ){
      echo "IT WORKS!";
        } ?>


    <h3></h3>
    <a href="#view" data-role="button" data-icon="search">View Deals</a>
    <a href="#add" data-role="button" data-icon="plus">Add Deals</a>

    </div>
</div>

<!--View Deal Page-->

    <div data-role="page" id="view">
    <div data-role="header">
        <h2>Find A Deal</h2>
    </div>

    <div data-role="content">

           <?php
    if( !isset( $_SESSION ) ){
     session_start();
        }

    if( isset( $_SESSION['username'] ) ){
      echo "IT WORKS!";
        } ?>


    <h3></h3>
    <p>test so I know I'm onto a new page</p>
    <a href="#view" data-role="button" data-icon="search">View Deals</a>
    <a href="#add" data-role="button" data-icon="plus">Add Deals</a>
    </div>

<div data-role="footer">

</div>
</div>

<!--Add Deal Page-->

    <div data-role="page" id="add">
    <script src="js/custom4.js"></script>
    <div data-role="header">
        <h2>Find A Deal</h2>
    </div>

    <div data-role="content">

           <?php
    if( !isset( $_SESSION ) ){
     session_start();
        }

    if( isset( $_SESSION['username'] ) ){
        echo "It's working!";
        } ?>

    <label for="name">Deal Name:</label>
        <input type="text" value="" name="name" id="name"/>
        <label for="desc">Description</label>
        <input type="text" value="" name="desc" id="desc"/>  
        <a data-role="button" id="submit-button" data-theme="b">Submit</a>
    </div>





</div>
</body>
</html>

所以只是为了解释一下 - 第一页是登录页面，它会将您带到索引旁边，这只是我设置的菜单页面，然后从菜单中选择2页中的1页 - 查看交易和添加交易。我现在正在处理添加交易。

添加交易时，用户会在相关文本框中输入交易名称和描述，以便将其添加到数据库中。我正在使用这个JS函数：

//Adding a new deal

$(document).on('pagebeforeshow', '#add', function(){ 
 $('#submit-button').on('click', function(){
    if($('#name').val().length > 0 && $('#desc').val().length > 0){
        userObject.name = $('#name').val(); // Put username into the object
        userObject.desc = $('#desc').val(); // Put password into the object
        // Convert an userObject to a JSON string representation
        var outputJSON = JSON.stringify(userObject);
        // Send data to server through ajax call
        // action is functionality we want to call and outputJSON is our data
        ajax.sendRequest({action : 'add', outputJSON : outputJSON});
    } else {
        alert('Please fill all nececery fields');
    }
 });    
});

$(document).on('pagebeforeshow', '#index', function(){ 
if(userObject.name.length == 0){ // If username is not set (lets say after force page refresh) get us back to the login page
    $.mobile.changePage( "#add", { transition: "slide"} ); // In case result is true change page to Index  
}
$(this).find('[data-role="content"] h3').append('Deal Added:' + userObject.name); // Change header with added message
//$("#index").trigger('pagecreate');
});

// This will be an ajax function set
var ajax = {
sendRequest:function(save_data){
    $.ajax({url: 'http://localhost/findadeal/login/json3.php',
        data: save_data,
        async: true,
        beforeSend: function() {
            // This callback function will trigger before data is sent
            $.mobile.showPageLoadingMsg(true); // This will show ajax spinner
        },
        complete: function() {
            // This callback function will trigger on data sent/received complete
            $.mobile.hidePageLoadingMsg(); // This will hide ajax spinner
        },
        success: function (result) {
            if(result == "true") {
                $.mobile.changePage( "#index", { transition: "slide"} ); // In case result is true change page to Index
            } else {
                alert('Deal Addition has been unsuccessful, please try again!'); // In case result is false throw an error
            }
            // This callback function will trigger on successful action
        },
        error: function (request,error) {
            // This callback function will trigger on unsuccessful action                
            alert('Error has occurred, please try again!');
        }
    });
}
}

// We will use this object to store username and password before we serialize it and send to server. This part can be done in numerous ways but I like this approach because it is simple
var userObject = {
name : "",
desc : ""
}

然后将其转换为PHP文件，准备将输入写入数据库，如下所示：

<?php

$var1 = $_REQUEST['action']; // We dont need action for this tutorial, but in a complex code you need a way to determine ajax action nature
$jsonObject = json_decode($_REQUEST['utputJSON']); // Decode JSON object into readable PHP object

$name = $jsonObject->{'name'}; // Get name from object
$desc = $jsonObject->{'desc'}; // Get desc from object

mysql_connect("localhost","root","");  // Conect to mysql, first parameter is location, second is mysql username and a third one is a mysql password
@mysql_select_db("findadeal") or die( "Unable to select database"); // Connect to database called test

$query = "INSERT INTO deal (dname, description) VALUES ('$name' ,'$desc')";
$result=mysql_query($query);
$num = mysql_numrows($result);

if($num != 0) {

    echo "true";

} else {

    echo "false"; 

}
?>

这一切都运行正常，但是，数据未插入数据库的原因是因为它需要用户的ID，其中用户名存储在会话变量中。

我想要帮助的是：

1。有人可以告诉我如何从会话变量获取数据并将其带到PHP文件中。 2。此外，会话变量存储用户名 - 有没有办法可以自行检查其相关的userid标签，还是必须通过PHP中的SQL语句来完成文件。

我希望我没有引起任何混淆，我已经清楚地知道我遇到了什么问题。我是学生，所以在学习过程中都会感激所有的帮助！如果会话数据像其他数据一样通过javascript函数或是否能够直接读取到编写PHP文件或者什么，我会感到困惑？ = /

感谢您的时间！

Answer 1

如果我理解得很好，你现在对学习东西更感兴趣，而不是创建应用程序。我建议你一次尝试学习一件事，在单独的测试文件中，当你获得必要的知识，然后将所有应用程序组合在一起，让你学到的一切都应用到现实生活中。

我是一名教练，培养了很多学生，并帮助他们实现了一些他们可以引以为傲的产品，所以如果你有兴趣逐一学习，我想我可以帮助你，如果你等。

Answer 2

如果我的逻辑正确，你必须做这样的事情：

在您的登录HTML / PHP页面上以：

开头

<?php
    if( !isset( $_SESSION ) ){ session_start(); }
?>
THE REST OF YOUR CODE FOLLOWS HERE

在您的登录操作PHP脚本中，再次：

<?php
    if( !isset( $_SESSION ) ){ session_start(); }
    // now you look up your user - how ever you do this...
    // might be something like this...
    // this is not a real function it should just demonstrate
    // the possible logic.
    if(!isset($_SESSION['userid'])) {
        // you just have to check in case no session userid is set:
        function getUser( $username, $password ) {
            $db = new PDO("mysql:host=".DBHOST.";dbname=".DBNAME, DBUSER, DBPASS);
            $sql = 'SELECT id FROM users WHERE username=:username AND pwd=:pwd';
            $statement = $db->prepare($sql);
            $statement->bindParam(':username', $username, PDO::PARAM_STR);
            $statement->bindParam(':pwd', $password, PDO::PARAM_STR);
            $statement->execute();
            $result = $statement->fetch(PDO::FETCH_ASSOC);
            if(!empty($result)) {
                return $result['id'];
            }
            return false;
        }
        // call your login logic (here getUser) and 
        // if you have a result, set the session...
        $userExists = getUser($_POST['user'], $_POST['pwd']);
        if($userExists) {
            $_SESSION['userid'] = $userExists;
        }
    }
?>

在交易行动中，再次：

<?php
    if( !isset( $_SESSION ) ){ session_start(); }
    // you check if the username session exists
    if(isset($_SESSION['userid'])) {
        // in case you have...
        // proceed with your deal logic
        // and use $_SESSION['userid'] to fill it to the DB
    }
?>

读取会话变量以写入数据库

2 个答案: