PHP development: How to implement search keyword prompts and automatic completion functions

PHP development: realizing search keyword prompts and automatic completion functions

In today's Internet era, search engines have become one of the important channels for people to obtain information. In website development, the importance of search function is self-evident. In order to improve user experience and search results, implementing search keyword prompts and automatic completion functions is a very valuable and necessary development task. This article will introduce how to implement search keyword prompts and automatic completion functions in PHP development, and provide specific code examples.

Search keyword prompts mean that when the user enters the search keyword, relevant search suggestions are displayed in real time based on the user's input. The auto-complete function automatically fills in existing search keywords or data during user input to provide a more convenient search experience.

To implement search keyword prompts and automatic completion functions, we need the following steps:

1. Establish a database and data table
   First, we need to create a Databases and data tables that store search keywords. It can be created using tools such as PHPMyAdmin.
2. Get the keywords entered by the user
   In the search box, we need to listen to the user's input event and send the entered keywords to the background for processing. JavaScript can be used to implement this functionality.

<script>
  $(document).ready(function(){
    $("#search").keyup(function(){
      var keyword = $(this).val();
      $.ajax({
        url: "suggest.php",
        method: "POST",
        data:{keyword:keyword},
        success:function(data){
          $("#suggest").html(data);
        }
      });
    });
  });
</script>

In the above code, we use the jQuery library to listen to the keyup event of the search box, and use AJAX to send the keywords entered by the user to the suggest.php file for processing. And display the returned results in the suggest element of the page.

3. Processing search keywords
   Next, we need to write the suggest.php file to process the keywords entered by the user and return relevant search suggestions. In this file, we need to connect to the database and query related search keywords.

<?php
  $keyword = $_POST["keyword"];
  
  // 连接数据库
  $conn = new mysqli("localhost", "root", "", "数据库名");
  if($conn->connect_error){
    die("数据库连接失败：" . $conn->connect_error);
  }
  
  // 查询相关的搜索建议
  $sql = "SELECT keyword FROM keywords WHERE keyword LIKE '$keyword%'";
  $result = $conn->query($sql);
  if($result->num_rows > 0){
    while($row = $result->fetch_assoc()){
      echo "<li>" . $row["keyword"] . "</li>";
    }
  }
  $conn->close();
?>

In the above code, we first obtain the keywords sent through AJAX. Then connect to the database and query search suggestions that match the keyword prefix. Finally, use the echo statement to return the search suggestions to the front-end page.

4. Implementing the auto-complete function
   In order to implement the auto-complete function, we need to fill the suggested text into the search box when the user clicks on the search suggestion.

<script>
  $(document).ready(function(){
    $(document).on("click", "#suggest li", function(){
      var keyword = $(this).text();
      $("#search").val(keyword);
      $("#suggest").html("");
    });
  });
</script>

In the above code, we use jQuery's on event to listen to the event when the user clicks on the search suggestion and fill the suggested text into the search box.

Through the above steps, we can implement search keyword prompts and automatic completion functions. This can greatly improve the user's search experience and optimize the accuracy of search results.

References:

• [jQuery official documentation](https://jquery.com/)
• [PHP official documentation](https://www .php.net/)

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