WordPress 按自定义分类搜索

Question

我正在使用以下代码，它允许我在我的自定义分类中创建一个术语下拉列表以用于搜索。

此代码适用于创建下拉列表并使用它进行搜索。问题是，我无法在结果页面的选择框中保留所选术语“已选择”。

我在此处 (https://wordpress.org/support/topic/plugin-events-manager-searching-by-custom-taxonomy#post-3792604) 复制了此问题的答案中的代码，它应该将所选类添加到搜索词中——但它没有做任何事情。

你能通过我的代码告诉我我做错了什么吗？问题似乎与 $search_values['grades'] == $term->slug 行有关。我的自定义分类是“等级”。

function get_terms_dropdown($taxonomies, $args)
{
    global $search_values;

    $myterms = get_terms($taxonomies, $args);
    $output = "";
    foreach ($myterms as $term) {
        $root_url = get_bloginfo('url');
        $term_taxonomy = $term->taxonomy;
        $term_slug = $term->slug;
        $term_name = $term->name;
        $value = $term->term_id;
        if ($search_values['grades'] == $term->slug) {
            $selected = 'selected="selected" ';
        } else {
            $selected = '';
        }
        $output .= "<option value='" . $value . "' " . $selected . ">" . $term_name . "</option>";
    }

    return $output;
}

Answer 1

尝试使用刚刚选择的生成如下选项的选项，而不是 selected = 'selected'。应该解决它：http://www.w3schools.com/tags/att_option_selected.asp

function get_terms_dropdown($taxonomies, $args)
{
    global $search_values;

    $myterms = get_terms($taxonomies, $args);
    $output = "";
    foreach ($myterms as $term) {
        $root_url = get_bloginfo('url');
        $term_taxonomy = $term->taxonomy;
        $term_slug = $term->slug;
        $term_name = $term->name;
        $value = $term->term_id;
        if ($search_values['grades'] == $term->slug) {
            $selected = 'selected';
        } else {
            $selected = '';
        }
        $output .= "<option value='" . $value . "' " . $selected . ">" . $term_name . "</option>";
    }

    return $output;
}