Home Backend Development PHP Tutorial Second-hand recycling website uses multi-level classification and screening function developed in PHP

Second-hand recycling website uses multi-level classification and screening function developed in PHP

Jul 02, 2023 pm 01:25 PM
php development Recycling website Multi-level classification filtering

The second-hand recycling website uses the multi-level classification and filtering function developed by PHP

In modern society, people are paying more and more attention to environmental protection, and second-hand recycling has become a popular consumer concept. In order to facilitate users to quickly find the second-hand items they need, many second-hand recycling websites have begun to pay attention to multi-level classification and filtering functions. This article will introduce how to use PHP to develop multi-level classification filtering functions and provide corresponding code examples.

First, we need to design the database table structure to store classification information. Suppose we have the following three tables: categories, subcategories, and items.

CREATE TABLE categories (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50) NOT NULL
);

CREATE TABLE subcategories (
    id INT PRIMARY KEY AUTO_INCREMENT,
    category_id INT NOT NULL,
    name VARCHAR(50) NOT NULL,
    FOREIGN KEY (category_id) REFERENCES categories (id)
);

CREATE TABLE items (
    id INT PRIMARY KEY AUTO_INCREMENT,
    subcategory_id INT NOT NULL,
    name VARCHAR(100) NOT NULL,
    price DECIMAL(10, 2) NOT NULL,
    FOREIGN KEY (subcategory_id) REFERENCES subcategories (id)
);
Copy after login

On the front end of the web page, we can use HTML and CSS to create multi-level category selectors. First, we need to create a select element so that the user can select the first-level category:

<label for="category">选择分类:</label>
<select id="category" name="category">
    <option value="">请选择分类</option>
    <?php
        // 获取所有一级分类
        $query = "SELECT * FROM categories";
        $result = mysqli_query($conn, $query);
        while ($row = mysqli_fetch_assoc($result)) {
            echo '<option value="' . $row["id"] . '">' . $row["name"] . '</option>';
        }
    ?>
</select>
Copy after login

When the user selects the first-level category, we can use AJAX to request the second-level category associated with the first-level category from the server:

$(document).ready(function() {
    $("#category").change(function() {
        var categoryID = $(this).val();
        $.ajax({
            url: "get_subcategories.php",
            type: "POST",
            data: { category_id: categoryID },
            success: function(response) {
                $("#subcategory").html(response);
            }
        });
    });
});
Copy after login

On the server side, we create a PHP script (get_subcategories.php) that handles AJAX requests and returns the secondary category options associated with the specified primary category:

<?php
    // 获取一级分类 ID
    $categoryID = $_POST["category_id"];

    // 获取相关的二级分类
    $query = "SELECT * FROM subcategories WHERE category_id = $categoryID";
    $result = mysqli_query($conn, $query);

    // 生成二级分类选项
    echo '<option value="">请选择二级分类</option>';
    while ($row = mysqli_fetch_assoc($result)) {
        echo '<option value="' . $row["id"] . '">' . $row["name"] . '</option>';
    }
?>
Copy after login

Next , we can display the corresponding second-hand item list according to the secondary classification selected by the user. On the front end of the web page, we can use a table to display the names and prices of second-hand items:

<table>
    <thead>
        <tr>
            <th>名称</th>
            <th>价格</th>
        </tr>
    </thead>
    <tbody id="item-list">
        <!-- 二手物品列表将通过 AJAX 动态加载到这里 -->
    </tbody>
</table>
Copy after login

When the user selects the secondary category, we can again obtain the information associated with the secondary category from the server through an AJAX request. Second-hand items:

$(document).ready(function() {
    $("#subcategory").change(function() {
        var subcategoryID = $(this).val();
        $.ajax({
            url: "get_items.php",
            type: "POST",
            data: { subcategory_id: subcategoryID },
            success: function(response) {
                $("#item-list").html(response);
            }
        });
    });
});
Copy after login

On the server side, we create a PHP script (get_items.php) that handles AJAX requests and returns a list of second-hand items associated with the specified secondary category:

<?php
    // 获取二级分类 ID
    $subcategoryID = $_POST["subcategory_id"];

    // 获取相关的二手物品
    $query = "SELECT * FROM items WHERE subcategory_id = $subcategoryID";
    $result = mysqli_query($conn, $query);

    // 生成二手物品列表
    while ($row = mysqli_fetch_assoc($result)) {
        echo '<tr>';
        echo '<td>' . $row["name"] . '</td>';
        echo '<td>' . $row["price"] . '</td>';
        echo '</tr>';
    }
?>
Copy after login

Through the above code example, we have implemented a multi-level classification and filtering function for a second-hand recycling website based on PHP. Users can select a first-level category, then select a corresponding second-level category based on the first-level category, and finally display a list of second-hand items associated with the selected second-level category. The development of this kind of function can help users quickly locate the second-hand items they need and improve the usability and user experience of the website.

Of course, the above is just a simple example. In the actual development process, we also need to consider functions such as data filtering and paging loading to improve website performance and user experience. I hope this article can inspire development and help developers implement more comprehensive and complete multi-level classification and filtering functions.

The above is the detailed content of Second-hand recycling website uses multi-level classification and screening function developed in PHP. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot Article Tags

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Teach you step by step to develop your own forum website using PHP Teach you step by step to develop your own forum website using PHP Oct 28, 2023 am 08:23 AM

Teach you step by step to develop your own forum website using PHP

How to use Memcache in PHP development? How to use Memcache in PHP development? Nov 07, 2023 pm 12:49 PM

How to use Memcache in PHP development?

How to develop a hotel booking website using PHP How to develop a hotel booking website using PHP Oct 28, 2023 am 08:19 AM

How to develop a hotel booking website using PHP

How to improve search engine rankings with PHP cache development How to improve search engine rankings with PHP cache development Nov 07, 2023 pm 12:56 PM

How to improve search engine rankings with PHP cache development

How to use PHP to develop the member points function of the grocery shopping system? How to use PHP to develop the member points function of the grocery shopping system? Nov 01, 2023 am 10:30 AM

How to use PHP to develop the member points function of the grocery shopping system?

How to use PHP to develop an online tutoring service platform How to use PHP to develop an online tutoring service platform Oct 28, 2023 am 09:01 AM

How to use PHP to develop an online tutoring service platform

How to implement version control and code collaboration in PHP development? How to implement version control and code collaboration in PHP development? Nov 02, 2023 pm 01:35 PM

How to implement version control and code collaboration in PHP development?

How to use PHP to develop the coupon function of the ordering system? How to use PHP to develop the coupon function of the ordering system? Nov 01, 2023 pm 04:41 PM

How to use PHP to develop the coupon function of the ordering system?

See all articles