How to add “Check all” to Edit post page in WP?

1 comment

1. try this-

       remove_meta_box('categorydiv');
   add_meta_box('categorydiv', "Categories", 'mycustom_category_meta_box', null, 'side', 'core', array( 'taxonomy' => 'category' ));
   function mycustom_category_meta_box($post, $box) {
       $defaults = array('taxonomy' => 'category');
       if ( !isset($box['args']) || !is_array($box['args']) )
           $args = array();
       else
           $args = $box['args'];
       extract( wp_parse_args($args, $defaults), EXTR_SKIP );
       $tax = get_taxonomy($taxonomy);
   
       ?>
       <div id="taxonomy-<?php echo $taxonomy; ?>" class="categorydiv">
           <ul id="<?php echo $taxonomy; ?>-tabs" class="category-tabs">
               <li class="tabs"><a href="#<?php echo $taxonomy; ?>-all" tabindex="3"><?php echo $tax->labels->all_items; ?></a></li>
               <li class="hide-if-no-js"><a href="#<?php echo $taxonomy; ?>-pop" tabindex="3"><?php _e( 'Most Used' ); ?></a></li>
           </ul>
   
           <div id="<?php echo $taxonomy; ?>-pop" class="tabs-panel" style="display: none;">
               <ul id="<?php echo $taxonomy; ?>checklist-pop" class="categorychecklist form-no-clear" >
                   <?php $popular_ids = wp_popular_terms_checklist($taxonomy); ?>
               </ul>
           </div>
   
           <div id="<?php echo $taxonomy; ?>-all" class="tabs-panel">
               <?php
               $name = ( $taxonomy == 'category' ) ? 'post_category' : 'tax_input[' . $taxonomy . ']';
               echo "<input type='hidden' name='{$name}[]' value='0' />"; // Allows for an empty term set to be sent. 0 is an invalid Term ID and will be ignored by empty() checks.
               ?>
               <ul id="<?php echo $taxonomy; ?>checklist" class="list:<?php echo $taxonomy?> categorychecklist form-no-clear">
   <li class="popular-category" style="float: right;">
   <label class="selectit">
   <input type="checkbox" name="" class="category-check-all" onchange="jQuery(this).closest('ul').find('input[type='checkbox']').prop('checked', jQuery(this).is(':checked'));">CHECK ALL
   </label>
   </li>
                   <?php wp_terms_checklist($post->ID, array( 'taxonomy' => $taxonomy, 'popular_cats' => $popular_ids ) ) ?>
               </ul>
           </div>
       <?php if ( current_user_can($tax->cap->edit_terms) ) : ?>
               <div id="<?php echo $taxonomy; ?>-adder" class="wp-hidden-children">
                   <h4>
                       <a id="<?php echo $taxonomy; ?>-add-toggle" href="#<?php echo $taxonomy; ?>-add" class="hide-if-no-js" tabindex="3">
                           <?php
                               /* translators: %s: add new taxonomy label */
                               printf( __( '+ %s' ), $tax->labels->add_new_item );
                           ?>
                       </a>
                   </h4>
                   <p id="<?php echo $taxonomy; ?>-add" class="category-add wp-hidden-child">
                       <label class="screen-reader-text" for="new<?php echo $taxonomy; ?>"><?php echo $tax->labels->add_new_item; ?></label>
                       <input type="text" name="new<?php echo $taxonomy; ?>" id="new<?php echo $taxonomy; ?>" class="form-required form-input-tip" value="<?php echo esc_attr( $tax->labels->new_item_name ); ?>" tabindex="3" aria-required="true"/>
                       <label class="screen-reader-text" for="new<?php echo $taxonomy; ?>_parent">
                           <?php echo $tax->labels->parent_item_colon; ?>
                       </label>
                       <?php wp_dropdown_categories( array( 'taxonomy' => $taxonomy, 'hide_empty' => 0, 'name' => 'new'.$taxonomy.'_parent', 'orderby' => 'name', 'hierarchical' => 1, 'show_option_none' => '&mdash; ' . $tax->labels->parent_item . ' &mdash;', 'tab_index' => 3 ) ); ?>
                       <input type="button" id="<?php echo $taxonomy; ?>-add-submit" class="add:<?php echo $taxonomy ?>checklist:<?php echo $taxonomy ?>-add button category-add-submit" value="<?php echo esc_attr( $tax->labels->add_new_item ); ?>" tabindex="3" />
                       <?php wp_nonce_field( 'add-'.$taxonomy, '_ajax_nonce-add-'.$taxonomy, false ); ?>
                       <span id="<?php echo $taxonomy; ?>-ajax-response"></span>
                   </p>
               </div>
           <?php endif; ?>
       </div>
       <?php
   }
   

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