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

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) );

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:

选择分类：  请选择分类 ' . $row["name"] . ''; } ?> 

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); } }); }); });

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:

请选择二级分类'; while ($row = mysqli_fetch_assoc($result)) { echo '' . $row["name"] . ''; } ?>

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:

 
 
 
名称
 
价格
 
 
 
  
 

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); } }); }); });

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:

'; echo '' . $row["name"] . ''; echo '' . $row["price"] . ''; echo ''; } ?>

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.

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