Filter feature malfunctioning in Select2

My dropdownmenu is implemented using Select2 and is populated via an Ajax call to PHP, which retrieves data from MySQL.

In the search field of the Select2 dropdownmenu, the letters I type get underlined but the filter functionality does not work. As a result, the list remains unfiltered based on the characters I input. Why is this happening?

Here is the JavaScript code being used:

$(document).ready(function(){
$("#test").select2({
placeholder: "test",
minimumInputLength: 1,
ajax: {
    url: "test.php",
    dataType: 'json',
    //search term
    data: function (term, page) {
        return {
        q: term, // search term
        page: page
        };
    },
    results: function (data, page) {
    return { results: data};
    } //End of results
}, //End of Ajax
}); //End of select2

Answer №1

To ensure efficient filtering, it is imperative to execute the process on the server-side. The following PHP script can effectively handle the filtering task:

PHP:

<?php
// establish database connection
require_once('db.php'); 

// Retrieve data from the database with a limit of 40 for optimized performance
$result = $db->prepare("SELECT * FROM table WHERE option LIKE :term ORDER BY option ASC LIMIT 0,40");

// Securely bind the value with a wildcard % suffix for enhanced security
$result->bindvalue(':term','%'.$_GET["q"].'%',PDO::PARAM_STR);
$result->execute();

// Ensure that there are results before proceeding to prevent null queries
if($result->rowcount() != 0) {
    while($row = $result->fetch(PDO::FETCH_ASSOC)){
        $filteredData[] = array(
            "id"=>$row['option_id'],
            "text"=>$row['option']);
        // Display text in the format of 'option'
    }
} else {
    // Inform the user if no results were found
    $filteredData[] = array("id"=>"0","text"=>"No Results Found..");
}

// Convert the filtered data to JSON format and return the result
echo json_encode($filteredData);

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