[Plugin: Events Manager] Custom Attribute dropdown into search form

Hi,

I’m posting this question because I’ve don’t found the solution neither in Google nor in Events manager’s documentation.

For my events, I’ve defined an attribute called “style_principal”.
I can display it by using the shortcode #_ATT{style_principal}

I want to create a new dropdown into search form on the main events page for searching by this attribute.

I’ve tried this code (inspiring myself by documentation / tutorial) :

function my_em_styles_principal_search_form(){ ?>
	<!-- DEBUT Recherche Style principal -->
	<select name="style_principal">
		<option value=''>Tous les styles</option>
		<option value="chanson" <?php echo ($_POST['style_principal'] == "chanson") ? 'selected="selected"':''; ?>>Chanson</option>
		<option value="eclectique" <?php echo ($_POST['style_principal'] == "eclectique") ? 'selected="selected"':''; ?>>Eclectique</option>
		<option value="electro" <?php echo ($_POST['style_principal'] == "electro") ? 'selected="selected"':''; ?>>Electro</option>
		<option value="festival" <?php echo ($_POST['style_principal'] == "festival") ? 'selected="selected"':''; ?>>Festival</option>
		<option value="groove" <?php echo ($_POST['style_principal'] == "groove") ? 'selected="selected"':''; ?>>Groove</option>
		<option value="jazz" <?php echo ($_POST['style_principal}'] == "jazz") ? 'selected="selected"':''; ?>>Jazz</option>
		<option value="musiques-monde" <?php echo ($_POST['style_principal'] == "musiques-monde") ? 'selected="selected"':''; ?>>Musiques du Monde</option>
		<option value="reggae" <?php echo ($_POST['style_principal'] == "reggae") ? 'selected="selected"':''; ?>>Reggae</option>
		<option value="rock" <?php echo ($_POST['style_principal'] == "rock") ? 'selected="selected"':''; ?>>Rock</option>
	</select>
	<!-- FIN Recherche Style principal -->
	<?php
}
add_action('em_template_events_search_form_ddm', 'my_em_styles_principal_search_form');

function my_em_styles_principal_accepted_searches($searches){
	$searches[] = 'style_principal';
	return $searches;
}
add_filter('em_accepted_searches','my_em_styles_principal_accepted_searches',1,1);

This code displays the dropdown but when I want to search by attributes, nothing happens, the page displays all events.

Can anyone help me please? I’ve spent so much time searching how to do this…

Thanks !

https://www.ads-software.com/extend/plugins/events-manager/