我使用的是Wordpress，并有一个搜索框，其中显示自定义类别的列表作为下拉字段。
当我在后端添加类别时，它们会显示其层次结构，但是，在下拉字段中，它们只会显示为字母列表。
即：
后端
A1
A2
-A2.1
-A2.2
A3
A4
前端
A1
A2
A2.1
A2.2
A3
A4
仅当将某项分配给该类别时才显示下拉搜索中的类别，这很好，但是如何获取前端以显示层次结构？
我认为我需要在代码中添加wp_dropdown_categories，但是我不确定如何修改代码。
用于显示类别的下拉框的代码如下，但我还提供了完整代码：
<div class="four columns">
<select id="adv_filter_city" name="adv_filter_city" class="fpcselector">
<option value="">-- <?php _e('Area', THE_LANG);?> --</option>
<?php
foreach ($fpc_property_cities as $fpc_property_city) {
$fpc_cityslug = $fpc_property_city->slug;
$fpc_cityname = $fpc_property_city->name;
if($fpc_cityslug==$filter_city){
$optselected = 'selected="selected"';
}else{
$optselected = '';
}
echo '<option value="'.esc_attr( $fpc_cityslug ).'" '.$optselected.'>'.$fpc_cityname.'</option>';
}
?>
</select>
</div>
</div>
完整代码
<?php
class FPC_PropertySearchWidgetHome extends WP_Widget {
/** constructor */
function FPC_PropertySearchWidgetHome() {
$widget_ops = array('classname' => 'widget_fpc_property_search_home', 'description' => __(' Home Property Search',THE_LANG) );
$this->WP_Widget('fpc-property-search-home', __('Home Property Search',THE_LANG), $widget_ops);
}
/** @see WP_Widget::widget */
function widget($args, $instance) {
extract( $args );
$title = apply_filters('widget_title', empty($instance['title']) ? __('Property Search',THE_LANG) : $instance['title']);
global $wp_query;
$fpc_initial = THE_INITIAL;
$fpc_shortname = THE_SHORTNAME;
$fpc_filterMap = fpc_get_option( $fpc_shortname . '_filter_map');
$fpc_minprice = fpc_get_option( $fpc_shortname . '_min_price','0');
$fpc_maxprice = fpc_get_option( $fpc_shortname . '_max_price','1000000');
$fpc_cursymbol = fpc_get_option( $fpc_shortname . '_currency_symbol');
$fpc_curplace = fpc_get_option( $fpc_shortname . '_currency_place');
if(!is_numeric($fpc_minprice)){
$fpc_minprice = 0;
}
if(!is_numeric($fpc_maxprice)){
$fpc_maxprice = 1000000;
}
$fpc_search_page = fpc_get_propsearch_page();
$fpc_adv_submit = $fpc_search_page['submiturl'];
$fpc_page_id = $fpc_search_page['pageid'];
$icons = array();
$fpc_purposecat = 'property_purpose';
$fpc_purpose_terms = get_terms($fpc_purposecat);
$fpc_propertycat = 'property_category';
$fpc_property_cats = get_terms($fpc_propertycat, array( 'exclude' => '5' ) );
$fpc_propertycity = 'property_city';
$fpc_property_cities= get_terms($fpc_propertycity);
$fpc_propstatuses = fpc_get_option($fpc_shortname.'_property_status');
?>
<?php echo $before_widget; ?>
<?php if ( $title )
echo $before_title . $title . $after_title; ?>
<!-- Advanced Search Container -->
<div class="fpc-widget-prop-search">
<?php
$filter_keywords = isset($_REQUEST['adv_filter_keywords'])? $_REQUEST['adv_filter_keywords'] : '';
$filter_purpose = isset($_REQUEST['adv_filter_purpose'])? $_REQUEST['adv_filter_purpose'] : '';
$filter_type = isset($_REQUEST['adv_filter_type'])? $_REQUEST['adv_filter_type'] : '';
$filter_city = isset($_REQUEST['adv_filter_city'])? $_REQUEST['adv_filter_city'] : '';
$filter_status = isset($_REQUEST['adv_filter_status'])? $_REQUEST['adv_filter_status'] : '';
$filter_numroom = isset($_REQUEST['adv_filter_numroom'])? $_REQUEST['adv_filter_numroom'] : '';
$filter_numbath = isset($_REQUEST['adv_filter_numbath'])? $_REQUEST['adv_filter_numbath'] : '';
$filter_size_min = isset($_REQUEST['adv_filter_size_min'])? $_REQUEST['adv_filter_size_min'] : '';
$filter_price_min = isset($_REQUEST['adv_filter_price_min'])? $_REQUEST['adv_filter_price_min'] : $fpc_minprice;
$filter_price_max = isset($_REQUEST['adv_filter_price_max'])? $_REQUEST['adv_filter_price_max'] : $fpc_maxprice;
?>
<div class="advanced-search">
<form id="frmwdgsearch" class="frmadvsearch" method="get" action="<?php echo esc_url( $fpc_adv_submit ); ?>">
<div class="form-search container">
<div class="row search-row-1">
<div class="four columns"><input type="text" class="fpctextbox" name="adv_filter_keywords" id="adv_filter_keywords" value="<?php echo esc_attr($filter_keywords); ?>" placeholder="<?php esc_attr_e('Search Property Name', THE_LANG); ?>" /></div>
<div class="four columns">
<select id="wdg_filter_status" name="adv_filter_status" class="fpcselector">
<option value="">-- <?php _e('Any Status', THE_LANG);?> --</option>
<?php
$fpc_optpropstatus = array();
for($i=0;$i<count($fpc_propstatuses);$i++){
$fpc_propstatus = $fpc_propstatuses[$i];
$fpc_optpropstatus[$fpc_propstatus] = $fpc_propstatus;
if($fpc_propstatus==$filter_status){
$optselected = 'selected="selected"';
}else{
$optselected = '';
}
echo '<option value="'. esc_attr( $fpc_propstatus ).'" '.$optselected.'>'.$fpc_propstatus.'</option>';
}
?>
</select>
</div>
<div class="four columns">
<select id="adv_filter_city" name="adv_filter_city" class="fpcselector">
<option value="">-- <?php _e('Area', THE_LANG);?> --</option>
<?php
foreach ($fpc_property_cities as $fpc_property_city) {
$fpc_cityslug = $fpc_property_city->slug;
$fpc_cityname = $fpc_property_city->name;
if($fpc_cityslug==$filter_city){
$optselected = 'selected="selected"';
}else{
$optselected = '';
}
echo '<option value="'.esc_attr( $fpc_cityslug ).'" '.$optselected.'>'.$fpc_cityname.'</option>';
}
?>
</select>
</div>
</div>
<div class="row search-row-2">
<div class="four columns">
<select id="adv_filter_type" name="adv_filter_type" class="fpcselector">
<option value="">-- <?php _e('Property Type', THE_LANG);?> --</option>
<?php
foreach ($fpc_property_cats as $fpc_property_cat) {
$fpc_catslug = $fpc_property_cat->slug;
$fpc_catname = $fpc_property_cat->name;
if($fpc_catslug==$filter_type){
$optselected = 'selected="selected"';
}else{
$optselected = '';
}
echo '<option value="'.esc_attr( $fpc_catslug ).'" '.$optselected.'>'.$fpc_catname.'</option>';
}
?>
</select>
</div>
<div class="four columns"><input type="text" class="fpctextbox" pattern="[0-9]+" id="adv_filter_numroom" title="Please enter whole numbers" name="adv_filter_numroom" value="<?php echo esc_attr($filter_numroom); ?>" placeholder="<?php esc_attr_e('Min Bedrooms', THE_LANG); ?>" /></div>
<div class="four columns"><input type="text" class="fpctextbox" pattern="[0-9]+" id="adv_filter_size_min" title="Please enter whole numbers" name="adv_filter_size_min" value="<?php echo esc_attr($filter_size_min); ?>" placeholder="<?php esc_attr_e('Min Acres', THE_LANG); ?>" /></div>
<div class="twelve columns rangeslidercontainer">
<div class="rangeslider"></div>
<div class="rangetext"><?php echo $fpc_cursymbol; ?><span id="text_price_min" class="text_price_min"><?php echo esc_attr($filter_price_min); ?></span> - <?php echo $fpc_cursymbol; ?><span id="text_price_max" class="text_price_max"><?php echo esc_attr($filter_price_max); ?></span></div>
<input type="hidden" name="adv_filter_price_min" id="adv_filter_price_min" class="adv_filter_price_min" value="<?php echo esc_attr($filter_price_min); ?>" />
<input type="hidden" name="adv_filter_price_max" id="adv_filter_price_max" class="adv_filter_price_max" value="<?php echo esc_attr($filter_price_max); ?>" />
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="four columns"><input name="submit" type="submit" class="button" id="wdg_filter_submit" value="<?php _e('Search',THE_LANG);?>"></div>
</div>
</div>
<input name="page_id" id="fpc_page_id" type="hidden" value="<?php echo esc_attr( $fpc_page_id ); ?>" />
</form>
</div>
</div>
<!-- END Advanced Search Container -->
<?php echo $after_widget; ?>
<?php
}
/** @see WP_Widget::update */
function update($new_instance, $old_instance) {
return $new_instance;
}
/** @see WP_Widget::form */
function form($instance) {
$instance['title'] = (isset($instance['title']))? $instance['title'] : "";
$title = esc_attr($instance['title']);
?>
<p><label for="<?php echo esc_attr( $this->get_field_id('title') ); ?>"><?php _e('Title:', THE_LANG); ?> <input class="widefat" id="<?php echo esc_attr( $this->get_field_id('title') ); ?>" name="<?php echo esc_attr( $this->get_field_name('title') ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></label></p>
<?php
}
} // class Widget
?>
非常感谢