Overriding widget via functions.php - php

Question

Woocommerce comes with a default product filter widget, located in
/wp-content/plugins/woocommerce/includes/widgets/class-wc-widget-layered-nav-filters.php
I have a lot of products/categories etc and using this looks very messy. I have tried to tidy it up and turn it into an accordion menu which seems to work as can be seen from code at bottom.
I am struggling, however, to add it into my theme.
I have created my own widget using:
<?php>
class Custom_WC_Widget_Layered_Nav extends WC_Widget_Layered_Nav {
Public function widget( $args, $instance ) {
//taken details prom default plugin and inserted here
}
?>
<script>
var acc = document.getElementsByClassName("widget-title");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].onclick = function() {
this.classList.toggle("active");
var panel = this.nextElementSibling;
if (panel.style.maxHeight){
panel.style.maxHeight = null;
} else {
panel.style.maxHeight = panel.scrollHeight + "px";
}
}
}
</script>
I have saved this in:
/wp-content/themes/my-theme/woocommerce/includes/widgets/custom-wc-widget-layered-nav.php
I then added the following code into functions.php:
add_action( 'widgets_init', 'err_override_woocommerce_widgets', 15 );
function err_override_woocommerce_widgets() {
if ( class_exists( 'WC_Widget_Layered_Nav' ) ) {
unregister_widget( 'WC_Widget_Layered_Nav' );
include_once( 'wp-content/themes/my-theme/woocommerce/includes/widgets/custom-wc-widget-layered-nav.php' );
register_widget( 'Custom_WC_Widget_Layered_Nav' );
}
}
The new code in the functions.php seems to give errors:
Fatal error: Class 'Custom_WC_Widget_Layered_Nav' not found in /homepages/8/d692312546/htdocs/Mytheme/wp-includes/class-wp-widget-factory.php on line 106
Is there anything I can change to avoid this error?
as you can see below, the coding seems to work and have desired affect.
var acc = document.getElementsByClassName("widget-title");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].onclick = function() {
this.classList.toggle("active");
var panel = this.nextElementSibling;
if (panel.style.maxHeight){
panel.style.maxHeight = null;
} else {
panel.style.maxHeight = panel.scrollHeight + "px";
}
}
}
h1.widget-title {
background-color: #eee;
color: #444;
cursor: pointer;
padding: 5px;
width: 100%;
text-align: left;
border: none;
outline: none;
transition: 0.4s;
margin-top:5px;
}
/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
h1.widget-title.active, h1.widget-title:hover {
background-color: #ccc;
}
/* Style the accordion panel. Note: hidden by default */
aside>ul {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
}
h1.widget-title:after {
content: '\02795'; /* Unicode character for "plus" sign (+) */
font-size: 13px;
color: #777;
float: right;
margin-left: 5px;
}
h1.widget-title.active:after {
content: "\2796"; /* Unicode character for "minus" sign (-) */
}
#secondary .widget {
font-size: 0.86em;
}
.widget-area > aside {
background: white;
border: 1px solid #ededed;
border-radius: 6px;
padding: 5px 20px;
margin-bottom: 5px;
width:20em
}
.widget-title {
font-size: 1.43em;
}
<div class="widget-area" id="secondary" role="complementary">
<aside class="widget woocommerce widget_layered_nav" id="Woocommerce-layered-nav-1">
<h1 class="widget-title">Title1</h1>
<ul>
<li class="layered-nav-term">
nav term
<span class="count">(10)</span>
</li>
</ul>
</aside>
<aside class="widget woocommerce widget_layered_nav" id="Woocommerce-layered-nav-2">
<h1 class="widget-title">Title2</h1>
<ul>
<li class="layered-nav-term">
nav term2
<span class="count">(10)</span>
</li>
</ul>
</aside>
</div>

Answer 1

According to this article
you have to change the path according to where you saved this widget:
add_action( 'widgets_init', 'err_override_woocommerce_widgets', 15 );
function err_override_woocommerce_widgets() {
// Ensure our parent class exists to avoid fatal error (thanks Wilgert!)
if ( class_exists( 'WC_Widget_Layered_Nav' ) ) {
unregister_widget( 'WC_Widget_Layered_Nav' );
include_once( 'woocommerce/includes/widgets/custom-wc-widget-layered-nav.php' );
register_widget( 'Custom_WC_Widget_Layered_Nav' );
}
}
Hope it works!
UPDATE:
What comes in mind is first save the script inside your js folder and name it something like custom.js then you have to register that script as follow:
// Register your assets during `wp_enqueue_scripts` hook inside `functions.php`.
function custom_register_scripts() {
// Give the path of the script
wp_register_script('js-custom', 'path/to/js/custom.js',array('jquery'));
}
then you can enqueue your script into where your widget is.
public function widget( $args, $instance ) {
// Enqueue needed assets inside the `widget` function.
wp_enqueue_script('js-custom');
// Output widget contents.
}