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如果有人能帮我解决这个问题,我会非常感激 - 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,我这样做的原因是因为我是编码新手,所以我觉得它会教我很多关于不同元素的知识(即添加、更新和删除记录)。

所以在这个例子中,我有一个用户成功登录,它正在创建一个会话,该会话正在通过其他表单传递。我希望他们能够添加一笔交易——我几乎已经完成了,但似乎在其中一个部分挣扎。

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,然后您可以从菜单中选择 2 个页面中的 1 个 - 查看交易并添加交易。我正在处理附加交易。

添加交易时,用户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 : ""
}

然后将其馈送到 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"; 

}
?>

这一切正常,但是,数据没有插入数据库的原因是它需要用户的 ID,用户名存储在会话变量中。

我想要帮助的是:

1.有人能告诉我你是如何从会话变量中获取数据并将其带到 PHP 文件中的吗? 2.此外,会话变量正在存储用户名 - 有没有办法我可以自行检查其相关的用户 ID 标记,或者这必须通过 PHP 文件中的 SQL 语句来完成。

我希望我没有引起任何混乱,并且我已经让自己清楚我遇到了什么麻烦。我是一名学生,因此在学习过程中将不胜感激所有帮助!我在思考会话数据应该像其他数据一样通过 javascript 函数还是应该能够直接读取到写入的 PHP 文件或什么?=/

谢谢你的时间!

4

2 回答 2

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如果我理解得很好,你现在更感兴趣的是学习东西而不是创建应用程序。我建议您尝试在单独的测试文件中一次学习一件事,当您获得必要的知识后,将所有知识结合到一个应用程序中,将您学到的所有内容应用于现实生活中的测试。

我是一名教练,培养了很多学生,帮助他们实现了一些他们可以引以为豪的产品,所以如果你有兴趣一一学习,我想我可以帮助你,如果你愿意。

于 2013-02-16T12:35:02.247 回答
0

如果我的逻辑正确,则必须执行以下操作:

在您的登录 HTML/PHP 页面上,以:

<?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;
        }
    }
?>

在交易动作中,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
    }
?>
于 2013-02-16T12:37:33.987 回答