Hiding inactive home sidebars

widgets-area.php: css to hide the sidebars in widgets page
functions.php: enqueue css in widgets-area.php
admin-style.js: hide containers of hidden sidebars in widgets page

css/widgets-area.php

@@ -0,0 +1,22 @@
+<?php
+	$absolute_path = explode('wp-content', $_SERVER['SCRIPT_FILENAME']);
+	$wp_load = $absolute_path[0] . 'wp-load.php';
+	require_once($wp_load);
+
+	header("Content-type: text/css; charset: UTF-8");
+	header('Cache-control: must-revalidate');
+
+	$sidebars = wp_get_sidebars_widgets();
+	$index = 0;
+	for ($i=1; $i < 31 ; $i++) { 
+		if( !empty($sidebars['home'.$i]) ){
+			if( $i > $index ){
+				$index = $i; //$index is the biggest home widget area that has widgets, the next widget area doesn't have widgets
+			}
+		}
+	}
+	$start = ++$index;
+	for ($i=$start; $i < 31; $i++) { 
+		echo '#home'.$i.'{ display:none; } ';
+	}
+?>

functions.php

@@ -172,30 +172,24 @@ function be_hidden_meta_boxes($hidden, $screen) {
 }
 
 
-function load_custom_wp_admin_style($page) {
-        wp_register_style( 'custom_wp_admin_css', get_template_directory_uri() . '/css/admin-style.css', false, '1.0.0' );
-        wp_enqueue_style( 'custom_wp_admin_css' );
-
-
-		wp_register_script('uc-admin-js', get_template_directory_uri() . '/js/admin-style.js', false, '1.0.0');
-		wp_enqueue_script('uc-admin-js');
-
+function load_custom_wp_admin_style($hook) {
+    wp_register_style( 'custom_wp_admin_css', get_template_directory_uri() . '/css/admin-style.css', false, '1.0.0' );
+    wp_enqueue_style( 'custom_wp_admin_css' );
+
+
+	wp_register_script('uc-admin-js', get_template_directory_uri() . '/js/admin-style.js', false, '1.0.0');
+	wp_enqueue_script('uc-admin-js');
 
+	if( 'widgets.php' != $hook )
+	    return;
+	wp_register_style( 'css-widgets-area', get_template_directory_uri().'/css/widgets-area.php' );
+	wp_enqueue_style( 'css-widgets-area' );
 }
 add_action( 'admin_enqueue_scripts', 'load_custom_wp_admin_style' );
 
-/*
-function remove_widgets() {
-	// removed to avoid confusion with UConn Calendar widget
-	unregister_widget('WP_Widget_Calendar');
-	// removed to de-emphasize blog use
-	unregister_widget('WP_Widget_Recent_Comments');
-	unregister_widget('WP_Widget_Meta');
-	// removed for conflict with simple social plugin on IE9
-	unregister_widget('WP_Widget_Categories');
+function widgets_page_css($hook) {
 
 }
-add_action( 'widgets_init', 'remove_widgets' );
-*/
+add_action( 'admin_enqueue_scripts', 'widgets_page_css' );
 
 add_theme_support( 'post-thumbnails' ); 

js/admin-style.js

@@ -2,4 +2,14 @@ jQuery(document).ready(function($) {
 	$('#accordion-section-layout_builder .ui-slider-handle').each(function(){
 		$(this).addClass('button button-primary');     
 	});
+
+	var path = window.location.pathname;
+	if( path.split('/').indexOf('widgets.php') != -1 ){
+		$('.widgets-holder-wrap.sidebar-sidebar').each(function(i){
+			if( !($(this['children'][0]).is(":visible"))  ){
+				$(this).css('display', 'none');
+			}
+		});		
+	}
+
 });