How to implement the drop-down menu function of the WeChat applet search box in PHP

How to implement the drop-down menu function of the WeChat Mini Program search box in PHP

With the popularity of WeChat Mini Programs, more and more companies are beginning to use WeChat Mini Programs for e-commerce sales and marketing. The search box is a very important component in the WeChat applet, which can help users quickly find the products and information they need. The drop-down menu function allows users to filter search results more conveniently. This article will introduce how to use PHP to implement the drop-down menu function of the WeChat applet search box.

1. Configure the WeChat applet development environment

First of all, before starting to use PHP to implement the WeChat applet search box drop-down menu function, we need to ensure that we have configured the development of the WeChat applet environment. For specific configuration steps, please refer to WeChat official documentation and will not be repeated here.

2. Implement the search box drop-down menu function

1. Get search keywords from the database

In order to implement the search box drop-down menu function, we need to first Get search keywords from the database. Here, we can use PHP's mysqli extension to connect to the database and get data from the table using SELECT statements.

The following is a sample code:

$mysqli = new mysqli("localhost", "username", "password", "database");

if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: " . $mysqli->connect_error;
    exit();
}

$query = "SELECT keyword FROM search_table";
$result = $mysqli->query($query);

$keywords = array();

while ($row = $result->fetch_assoc()) {
    $keywords[] = $row["keyword"];
}

$mysqli->close();

In the above code, we connect to the database named "database" and obtain all search keywords from the table named "search_table" . The obtained search keywords will be stored in an array named "$keywords".

2. Filter search keywords based on user input

Next, we need to filter out the matching search keywords based on the user input and return them Give small programs.

The following is a sample code:

$keyword = $_GET["keyword"];

$results = array();

foreach ($keywords as $k) {
    if (strpos($k, $keyword) !== false) {
        $results[] = $k;
    }
}

echo json_encode($results);

In the above code, we first use $_GET["keyword"] to obtain the search keyword entered by the user. Then, we loop through all search keywords and use the strpos function to determine whether the keywords entered by the user are included. If included, add it to the results array "$results".

Finally, we convert the "$results" array into JSON format and output it to the browser.

3. Display the search box drop-down menu in the mini program

Now, we have obtained the search keywords that match the user input. Next, we need to display these search keywords in the search box drop-down menu of the mini program.

The following is a sample code:

<view class="dropdown" wx:if="{{ showDropdown }}">
    <view class="list" wx:for="{{ dropdownList }}" wx:key="index" bindtap="handleDropdownTap">
        {{ item }}
    </view>
</view>

The above code defines a view component named "dropdown" and uses wx:if and showDropdown variables to control whether it is displayed. When the showDropdown variable is true, the drop-down menu will be displayed.

In the view component, we use wx:for and dropdownList variables to loop and render each item in the drop-down menu, and use bindtap to bind the click event of each item in the drop-down menu.

In the JS file of the mini program, we can get the data in the search box drop-down menu by calling the PHP interface.

The following is a sample code:

onInput: function(e) {
    var keyword = e.detail.value;

    if (keyword.length > 0) {
        wx.request({
            url: "http://localhost/search.php?keyword=" + keyword,
            success: function(res) {
                var list = res.data;

                if (list.length > 0) {
                    this.setData({ 
                        showDropdown: true,
                        dropdownList: list 
                    });
                }
            }.bind(this)
        });
    }
}

The above code defines an event handling function named "onInput" and uses e.detail.value to obtain the content entered by the user in the search box .

When the length of the content input by the user is greater than 0, we call the wx.request method to call the PHP interface to obtain the data in the search box drop-down menu.

After successfully obtaining the data, we set showDropdown to true and dropdownList to the obtained data, so that the search box drop-down menu can be displayed.

3. Summary

Through the above steps, we can easily use PHP to implement the drop-down menu function of the WeChat applet search box. Of course, the specific implementation process still needs to be adjusted and optimized according to your actual needs. I hope this article is helpful to everyone, thank you for reading.

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