Implementation method of text box auto-complete function developed in PHP in WeChat applet

With the popularity of WeChat mini programs, various development needs are also increasing. Among them, the text box auto-complete function is one of the commonly used functions in mini programs. Although the WeChat applet provides some native components, some special needs still require secondary development. This article will introduce how to use PHP language to implement the automatic completion function of text boxes in WeChat applet.

1. Preparation

Before starting development, you need to prepare some basic environments and tools. First, you need to install the PHP environment. Secondly, you need to obtain your AppID and AppSecret in the WeChat applet background. Finally, there needs to be a keyword data source that can be read.

2. Implementation ideas

To implement the automatic completion function of the text box, you need to follow the following steps:

(1) Get the text entered by the user;

(2) Match the text entered by the user with the keyword data source;

(3) Return the matching result to the front end;

(4) The front end returns The results show a drop-down list.

In order to implement these functions, you need to first write a PHP file to match and return results.

3. Code implementation

3.1 Code framework

// 1. Obtain user input and filter
$input = isset($_GET['input']) ? htmlspecialchars(trim($_GET['input'])) : '';

// 2. Keyword matching
$result = array( );
if($input !== ''){
// Process matching results
}

// 3. Return matching results
echo json_encode($result) ;

?>

3.2 Obtain keyword data source and parse

The keyword data source can be stored in a txt file and read and parsed through the following methods Analysis:

// Open the keyword data source file and read the keyword content
$file = fopen('keyword.txt', 'r');
$keywords = array() ;
while (!feof($file)) {
array_push($keywords,fgets($file));
}
fclose($file);

// Parse keyword data source
$keywords = array_map('trim', $keywords);
$keywords = array_filter($keywords);
$keywords = array_unique($keywords);

3.3 Keyword matching

Match the text entered by the user with the keyword and return the matching result:

foreach ($keywords as $keyword) {
// Use PHP Use the stripos function to match
if (stripos($keyword, $input) !== false) {

  // 如果匹配成功，则将匹配结果存入$result数组中 
  array_push($result, $keyword); 

}
}

3.4 Return matching results

Finally, return the matching result to the front-end in JSON format:

echo json_encode($result);

4. Front-end implementation

The front-end needs to pass The request function of the WeChat applet API calls the above PHP file and displays the return result in the drop-down list:

// 1. Define the bindinput event of the input input box

// 2. Define the onInput event processing function
onInput(e) {
const input = e. detail.value
// Send request to PHP file
wx.request({

  url: 'http://localhost/autocomplete.php?input='+input, 
  success: (res) => { 
     const result = res.data 
     // 接收并处理PHP文件返回的结果 
     this.setData({result}) 
  } 

})
}

// 3. Display the drop-down list on the interface

{{item}}

5. Summary

This article introduces how to use PHP language to implement the automatic completion function of text boxes in WeChat applet. Through the above steps, we can easily complete this function. At the same time, we also need to pay attention to the format of the data source and the selection of the matching algorithm to ensure the accuracy and stability of the function.

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