Create Image Uploader for Widget

I found this post//

Use Media upload in custom widget on wordpress 3.5

I’m not experienced in any of this so I pretty much just copied the code he provided into my own functions.php file. I uploaded the JS and everything…

I then replaced certain code that “sven” posted in his answer.

The uploader works perfectly but when I view front end the image isn’t even displayed…

Here is the code within my functions.php//

(it includes the registered sidebars and the custom widget etc)

 if (function_exists('register_sidebar')) {
 register_sidebar(array(
  'name' => 'Left Sidebar',
  'id'   => 'left-sidebar',
  'description'   => 'Widget Area',
  'before_widget' => '<div id="one" class="two"><h1>EOTW//</h1>',
  'after_widget'  => '</div>',
  'before_title'  => '<h2>',
  'after_title'   => '</h2>'
 ));
}


add_action('widgets_init', 'ctUp_ads_widget');
function ctUp_ads_widget() {
register_widget( 'ctUp_ads' );
}

function ctUp_wdScript(){
wp_enqueue_media();
wp_enqueue_script('adsScript', get_template_directory_uri() . '/js/ads.js');
}
add_action('admin_enqueue_scripts', 'ctUp_wdScript');

class ctUp_ads extends WP_Widget{

function ctUp_ads() {
    $widget_ops = array( 'classname' => 'ctUp-ads' );
    $control_ops = array( 'width' => 250, 'height' => 350, 'id_base' => 'ctUp-ads-widget' );
    $this->WP_Widget( 'ctUp-ads-widget','EOTW', $widget_ops, $control_ops );
}

public function widget($args, $instance){ 
    extract( $args );   
?>
<a href="#"><img src="<?php echo esc_url($instance['image_uri']); ?>" /></a>
<?php }

function update($new_instance, $old_instance) {
    $instance = $old_instance;
    $instance['text'] = strip_tags( $new_instance['text'] );
    $instance['image_uri'] = strip_tags( $new_instance['image_uri'] );
    return $instance;
}

public function form($instance){ ?>
<p>
  <label for="<?php echo $this->get_field_id('text'); ?>"><?php _e('Text', 'themename'); ?></label><br />
  <input type="text" name="<?php echo $this->get_field_name('text'); ?>" id="<?php echo $this->get_field_id('text'); ?>" value="<?php echo $instance['text']; ?>" class="widefat" />
</p>
<p>
  <label for="<?php echo $this->get_field_id('image_uri'); ?>">Image</label><br />
    <img class="custom_media_image" src="<?php if(!empty($instance['image_uri'])){echo $instance['image_uri'];} ?>" style="margin:0;padding:0;max-width:100px;float:left;display:inline-block" />
    <input type="text" class="widefat custom_media_url" name="<?php echo $this->get_field_name('image_uri'); ?>" id="<?php echo $this->get_field_id('image_uri'); ?>" value="<?php echo $instance['image_uri']; ?>">
    <input type="button" value="<?php _e( 'Upload Image', 'themename' ); ?>" class="button custom_media_upload" id="custom_image_uploader"/>
</p>
<?php } }  ?>

Here is the JS//

jQuery(document).ready( function(){
function media_upload( button_class) {
var _custom_media = true,
_orig_send_attachment = wp.media.editor.send.attachment;
jQuery('body').on('click',button_class, function(e) {
    var button_id ='#'+jQuery(this).attr('id');
    /* console.log(button_id); */
    var self = jQuery(button_id);
    var send_attachment_bkp = wp.media.editor.send.attachment;
    var button = jQuery(button_id);
    var id = button.attr('id').replace('_button', '');
    _custom_media = true;
    wp.media.editor.send.attachment = function(props, attachment){
        if ( _custom_media  ) {
           jQuery('.custom_media_id').val(attachment.id); 
           jQuery('.custom_media_url').val(attachment.url);
               jQuery('.custom_media_image').attr('src',attachment.url).css('display','block');   
        } else {
            return _orig_send_attachment.apply( button_id, [props, attachment] );
        }
    }
    wp.media.editor.open(button);
    return false;
});
}
media_upload( '.custom_media_upload');
});

Now my question is, what exactly do I have to fix in order for this image uploader to work?
I figured the updates “sven” provided would help but clearly I am missing something.
Please Help.

Let’s face it in detail: The registered sidebar (with the ID left-sidebar) has two arguments to wrap the whole widget (before_widget and after_widget) which you can output via echo $before_widget and echo $after_widget in your widget (see my version below):

<?php

// Register sidebar
if (function_exists('register_sidebar')) {
    register_sidebar(
        array(
        'name' => 'Left Sidebar',
        'id' => 'left-sidebar',
        'description' => 'Widget Area',
        'before_widget' => '<div id="one" class="two">',
        'after_widget' => '</div>',
        )
    );
}

// Register widget
add_action('widgets_init', 'ctUp_ads_widget');
function ctUp_ads_widget() {
    register_widget( 'ctUp_ads' );
}

// Enqueue additional admin scripts
add_action('admin_enqueue_scripts', 'ctup_wdscript');
function ctup_wdscript() {
    wp_enqueue_media();
    wp_enqueue_script('ads_script', get_template_directory_uri() . '/js/widget.js', false, '1.0.0', true);
}

// Widget
class ctUp_ads extends WP_Widget {

    function ctUp_ads() {
        $widget_ops = array('classname' => 'ctUp-ads');
        $this->WP_Widget('ctUp-ads-widget', 'EOTW', $widget_ops);
    }

    function widget($args, $instance) {
        echo $before_widget;
?>

    <h1><?php echo apply_filters('widget_title', $instance['text'] ); ?></h1>
    <img src="<?php echo esc_url($instance['image_uri']); ?>" />

<?php
        echo $after_widget;

    }

    function update($new_instance, $old_instance) {
        $instance = $old_instance;
        $instance['text'] = strip_tags( $new_instance['text'] );
        $instance['image_uri'] = strip_tags( $new_instance['image_uri'] );
        return $instance;
    }

    function form($instance) {
?>

    <p>
        <label for="<?php echo $this->get_field_id('text'); ?>">Text</label><br />
        <input type="text" name="<?php echo $this->get_field_name('text'); ?>" id="<?php echo $this->get_field_id('text'); ?>" value="<?php echo $instance['text'] ?? ''; ?>" class="widefat" />
    </p>
    <p>
        <label for="<?= $this->get_field_id( 'image_uri' ); ?>">Image</label>
        <img class="<?= $this->id ?>_img" src="<?= (!empty($instance['image_uri'])) ? $instance['image_uri'] : ''; ?>" style="margin:0;padding:0;max-width:100%;display:block"/>
        <input type="text" class="widefat <?= $this->id ?>_url" name="<?= $this->get_field_name( 'image_uri' ); ?>" value="<?= $instance['image_uri'] ?? ''; ?>" style="margin-top:5px;" />
        <input type="button" id="<?= $this->id ?>" class="button button-primary js_custom_upload_media" value="Upload Image" style="margin-top:5px;" />
    </p>

<?php
    }
}

And the JavaScript for the upload button:

jQuery(document).ready(function ($) {
  function media_upload(button_selector) {
    var _custom_media = true,
        _orig_send_attachment = wp.media.editor.send.attachment;
    $('body').on('click', button_selector, function () {
      var button_id = $(this).attr('id');
      wp.media.editor.send.attachment = function (props, attachment) {
        if (_custom_media) {
          $('.' + button_id + '_img').attr('src', attachment.url);
          $('.' + button_id + '_url').val(attachment.url);
        } else {
          return _orig_send_attachment.apply($('#' + button_id), [props, attachment]);
        }
      }
      wp.media.editor.open($('#' + button_id));
      return false;
    });
  }
  media_upload('.js_custom_upload_media');
});

Your widget can now be part of every sidebar (aka widget area). To output an sidebar you can use the function dynamic_sidebar() which will work everywhere in your templates:

if ( is_active_sidebar('left-sidebar') ) {
    dynamic_sidebar('left-sidebar');
}

Update 01/2019: I tweaked the code to make it work with multiple widgets and sidebars.