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After successful installation of K2 Google Maps plugin there are extra fields in Plugins Tab in item edit form:

This text is a step by step manual how to get special Map Tab in item edit form:

First file mod

administrator/components/com_k2/views/item/view.html.php

Find rows around #293

 
  $K2PluginsItemOther=$dispatcher->trigger('onRenderAdminForm', array (&$item, 'item', 'other' ) );
  $this->assignRef('K2PluginsItemOther', $K2PluginsItemOther);
 
  $form = new JParameter('', JPATH_COMPONENT.DS.'models'.DS.'item.xml');
  $form->loadINI($item->params);
  $this->assignRef('form', $form);
 
 

.. and add 2 lines, so the final code is

 
  $K2PluginsItemOther=$dispatcher->trigger('onRenderAdminForm', array (&$item, 'item', 'other' ) );
  $this->assignRef('K2PluginsItemOther', $K2PluginsItemOther);
 
  $K2PluginsItemGMap=$dispatcher->trigger('onRenderAdminForm', array (&$item, 'item', 'gmap' ) );
  $this->assignRef('K2PluginsItemGMap', $K2PluginsItemGMap);
 
  $form = new JParameter('', JPATH_COMPONENT.DS.'models'.DS.'item.xml');
  $form->loadINI($item->params);
  $this->assignRef('form', $form);
 
 

Second file

administrator/components/com_k2/views/item/tmpl/default.php

Find lines #247-259

 
<!-- Tabs start here -->
<div class="simpleTabs">
 <ul class="simpleTabsNavigation">
   <li id="tabContent"><a href="#"><?php echo JText::_('Content'); ?></a></li>
   <li id="tabImage"><a href="#"><?php echo JText::_('Image'); ?></a></li>
   <li id="tabImageGallery"><a href="#"><?php echo JText::_('Image gallery'); ?></a></li>
   <li id="tabVideo"><a href="#"><?php echo JText::_('Video'); ?></a></li>
   <li id="tabExtraFields"><a href="#"><?php echo JText::_('Extra fields'); ?></a></li>
   <li id="tabAttachments"><a href="#"><?php echo JText::_('Attachments'); ?></a></li>
   <?php if(count(array_filter($this->K2PluginsItemOther))): ?>
   <li id="tabPlugins"><a href="#"><?php echo JText::_('Plugins'); ?></a></li>
   <?php endif; ?>
 </ul>
 

.. and add 1 line, so the final code is

 
<!-- Tabs start here -->
<div class="simpleTabs">
 <ul class="simpleTabsNavigation">
   <li id="tabContent"><a href="#"><?php echo JText::_('Content'); ?></a></li>
   <li id="tabImage"><a href="#"><?php echo JText::_('Image'); ?></a></li>
   <li id="tabImageGallery"><a href="#"><?php echo JText::_('Image gallery'); ?></a></li>
   <li id="tabVideo"><a href="#"><?php echo JText::_('Video'); ?></a></li>
   <li id="tabExtraFields"><a href="#"><?php echo JText::_('Extra fields'); ?></a></li>
   <li id="tabAttachments"><a href="#"><?php echo JText::_('Attachments'); ?></a></li>
   <li id="tabGMap"><a href="#"><?php echo JText::_('Map'); ?></a></li>
   <?php if(count(array_filter($this->K2PluginsItemOther))): ?>
   <li id="tabPlugins"><a href="#"><?php echo JText::_('Plugins'); ?></a></li>
   <?php endif; ?>
 </ul>
 

then, in the same file find lines #593-594

 
 <?php if(count(array_filter($this->K2PluginsItemOther))): ?>
 <!-- Tab other plugins -->
 

.. and before these add few lines, so the final code is

 
 <!-- Tab gMap -->
 <div class="simpleTabsContent">
    <div class="itemPlugins">
      <?php foreach ($this->K2PluginsItemGMap as $K2Plugin) : ?>
      <?php if(!is_null($K2Plugin)): ?>
      <fieldset>
        <legend><?php echo $K2Plugin->name; ?></legend>
        <?php echo $K2Plugin->fields; ?>
      </fieldset>
      <?php endif; ?>
      <?php endforeach; ?>
    </div>
 </div>
 
 <?php if(count(array_filter($this->K2PluginsItemOther))): ?>
 <!-- Tab other plugins -->
 

Third file - CSS

administrator/components/com_k2/css/k2.css

Add style to css file, line #235

 
ul.simpleTabsNavigation li#tabGMap a {background-image: url('/../images/editforms/Map.png');}
 

and upload an icon for the tab

administrator/components/com_k2/images/editforms/Map.png

Category edit form

In very similiar way you can modify files for category edit form:

Download

Download all modified files in following ZIP package, extract with complete directory structure and after back-up of original files, upload to your server.

K2 version 2.3!, also changed files with special Tab in category edit form included.