PHP MySQL根据选择和onclick选项显示数据库

时间:2016-08-12 05:17:25

标签: javascript php html mysql forms

我需要选择一个选项(图书类别),然后搜索数据库以查找具有该类别的所有图书,并将数据库显示为表格。

我可以在此代码中使用HTML,JavaScript,PHP和MySQL。

这是HTML代码:

<p>
            <select name="genre" size="1">
                <option value='0' id='AA'>Art & Architecture</option>
                <option value='1' id='BG'>Biography</option>
                <option value='2' id='CH'>Children</option>
                <option value='3' id='DR'>Drama</option>
                <option value='4' id='ER'>Erotica</option>
                <option value='5' id='HS'>History</option>
                <option value='6' id='ML'>Military</option>
                <option value='7' id='MU'>Music</option>
                <option value='8' id='NE'>Non-English</option>
                <option value='9' id='NV'>Novels</option>
                <option value='10' id='OC'>Occult</option>
                <option value='11' id='PS'>Philosophy</option>
                <option value='12' id='PG'>Photography</option>
                <option value='13' id='PT'>Poetry</option>
                <option value='14' id='PE'>Politics & Economics</option>
                <option value='15' id='RG'>Religion</option>
                <option value='16' id='SE'>Science & Engineering</option>
                <option value='17' id='SP'>Sport</option>
                <option value='18' id='TE'>Travel & Exploration</option>
            </select>
        <input type="submit" value="Search" onClick="">
    </p> 

这是PHP和MySQL代码:

<?php 
        $mysqli = new mysqli('localhost','root','','bookstore');
        if(mysqli_connect_errno())
        {
            $problem = mysqli_connect_error();
            echo "Error opening database";
            die ($problem);
        }
        $genre = getElementByName('genre');
        $query = "SELECT category(*) FROM book_list WHERE category=$genre"; 

        echo "<h2>These are the books available</h2>";
        // Execute Query
        $result = $mysqli->query($query);
        // echo "<table border="1">";
            while($row = $result->fetch_array(mysql_query))
            {
                $Title = $row["Title"];
                $Author = $row["Author"];
                $Price = $row["Price ($)"];

                echo "<tr><td>$Title</td><td>$Author</td><td>$Price</td></tr>";
                echo "</table>";
            }
        $result->close();
    ?>

任何出错的想法?​​

P.S。:PHP的新手,所以请使用简单的语言和解释。谢谢!

1 个答案:

答案 0 :(得分:0)

好像你在这里混淆了php和javascript(jquery)之间的东西.. 我已经为你的查询提出了以下结论..

创建 test.php 文件

<script   src="https://code.jquery.com/jquery-3.1.0.min.js"   integrity="sha256-cCueBR6CsyA4/9szpPfrX3s49M9vUU5BgtiJj06wt/s="   crossorigin="anonymous"></script>

<script>

$(document).ready(function(){
    $("#genre").on('change', function postinput(){
        var genre = $(this).val(); // this.value
        $.ajax({
            url: 'test2.php',
            data: { genre: genre },
            type: 'post'
        }).done(function(responseData) {
            console.log('Done: ', responseData);
            $("#your_html_response").html(responseData);
        }).fail(function() {
            console.log('Failed');
        });
    });
});

</script>

<p>
            <select name="genre" id="genre" size="1">
                <option value='0' id='AA'>Art & Architecture</option>
                <option value='1' id='BG'>Biography</option>
                <option value='2' id='CH'>Children</option>
                <option value='3' id='DR'>Drama</option>
                <option value='4' id='ER'>Erotica</option>
                <option value='5' id='HS'>History</option>
                <option value='6' id='ML'>Military</option>
                <option value='7' id='MU'>Music</option>
                <option value='8' id='NE'>Non-English</option>
                <option value='9' id='NV'>Novels</option>
                <option value='10' id='OC'>Occult</option>
                <option value='11' id='PS'>Philosophy</option>
                <option value='12' id='PG'>Photography</option>
                <option value='13' id='PT'>Poetry</option>
                <option value='14' id='PE'>Politics & Economics</option>
                <option value='15' id='RG'>Religion</option>
                <option value='16' id='SE'>Science & Engineering</option>
                <option value='17' id='SP'>Sport</option>
                <option value='18' id='TE'>Travel & Exploration</option>
            </select>
    </p>

    <div id="your_html_response">

    </div>

在上面,我已经包含了一个jquery库并使用dropdown的onchange函数将值发布到 test2.php 文件..

您还可以看到空白<div id="your_html_response"></div>,它会从响应中添加来自 test2.php 文件的数据

还删除了<input type="submit" value="Search" onClick="">,因为您没有在代码中创建表单,因此不需要{。}}。

创建了 test2.php 文件

<?php


        $mysqli = new mysqli('localhost','root','','bookstore');
        if(mysqli_connect_errno())
        {
            $problem = mysqli_connect_error();
            echo "Error opening database";
            die ($problem);
        }
        $genre = $_POST['genre'];
        $query = "SELECT category(*) FROM book_list WHERE category=$genre";

        $html_response = "<h2>These are the books available</h2>";
        // Execute Query
        $result = $mysqli->query($query);
        $html_response .= "<table border='1'>";
            while($row = $result->fetch_array(mysql_query))
            {
                $Title = $row["Title"];
                $Author = $row["Author"];
                $Price = $row["Price ($)"];

                $html_response.= "<tr><td>$Title</td><td>$Author</td><td>$Price</td></tr>";

            }
            $html_response .= "</table>";


        $result->close();
        echo $html_response;
    ?>

上面我已经从下拉列表中获取了已发布的值并连接了一个数据库并使用mysqli查询返回记录(如果有的话)..我已经在html中返回了响应..

如果你看到,在 test.php 中你可以找到这段代码

done(function(responseData) {
            console.log('Done: ', responseData);
            $("#your_html_response").html(responseData);
    }

我使用$("#your_html_response").html(responseData);添加了我们从test2.php文件中获得的响应中的数据

希望这总结你的困惑。