Wordpress: how to call a plugin function with an ajax call?

Question

I\'m writing a Wordpress MU plugin, it includes a link with each post and I want to use ajax to call one of the plugin functions when the user clicks on this link, and then

Answer 1

Just to add an information. If you want to receive an object from a php class method function :

js file

jQuery(document).ready(function(){
jQuery(".foobar").bind("click", function() {
    var data = {
        'action': 'getAllOptionsByAjax',
        'arg1': 'val1',
        'arg2': $(this).val() 
    };
    jQuery.post( ajaxurl, data, function(response) {
       var jsonObj = JSON.parse( response );
    });
});

php file

public static function getAllOptionsByAjax(){

    global $wpdb;

    // Start query string
    $query_string  =  "SELECT * FROM wp_your_table WHERE col1='" . $_POST['arg1'] . "' AND col2 = '" . $_POST['arg2'] . "' ";

    // Return results
    $a_options = $wpdb->get_results( $query_string, ARRAY_A );
    $f_options = array();
    $f_options[null] =  __( 'Please select an item', 'my_domain' );
    foreach ($a_options as $option){
        $f_options [$option['id']] = $option['name'];
    }
    $json = json_encode( $f_options );
    echo $json;
    wp_die();
}