Summary of Changes

In sequence of #9738, this PR does some improvements to searchtools with the goal of providing more flexibility and to remove all backend searchtools layout overrides.

1. Adds a attribute noresults to the search field in the filter fields xml. This attribute contains the language string of the no results message of the searchtools

   Example:

   <field
     name="search"
     type="text"
     label="JSEARCH_FILTER"
     description="JSEARCH_FILTER"
     hint="JSEARCH_FILTER"
     noresults="COM_CHECKIN_NO_ITEMS"
   />

2. Adds a attribute layout to the selector field in the filter fields xml. This attribute contains the layout where the field should be rendered (no attribute for all). This is useful for views that have 2 layouts. example modules has default layout and modal layout.
   Adds also a attribute filtermode to the selector field in the filter fields xml. This attribute has only one value selector. This is used to identify which field is the selector, when exists.
   Example:

   <field
     name="client_id"
     type="list"
     onchange="this.form.submit();"
     filtermode="selector"
     layout="default"
     >
     <option value="0">JSITE</option>
     <option value="1">JADMINISTRATOR</option>
   </field>

3. Now it can autodetect if the filters button "Search Tools" should exist or not.

4. Removed all the, now not needed, searchtools backend layout overrides.

5. As PoC i implemented, in this PR, the changes in all views that currently have a "selector":

   • com_menus items view: selector menutype
   • com_cache cache view: selector client_id
   • com_modules modules view (default and modal layout): selector client_id
   • com_languages installed view: selector client_id

   

6. Also, as PoC implemented it in (views without selector):

   • com_checkin checkin view
   • com_modules modules view (frontend popup)

   

Testing Instructions

1. Test if the searchtools work fine in the several views changed in this PR.
2. Test if the searchtools work fine in some of the unchanged views (ex: articles, categories, etc).

Observations

After, and if, this is merged i will change all the other views to use this new searchtools model, by replacing something like this:

<?php echo JLayoutHelper::render('joomla.searchtools.default', array('view' => $this, 'options' => array('filterButton' => false))); ?>
<div class="clearfix"></div>
<?php if (empty($this->items)) : ?>
    <div class="alert alert-no-items">
        <?php echo JText::_('COM_CHECKIN_NO_ITEMS'); ?>
    </div>

By this (moving also the no results message to the xml file noresults="COM_CHECKIN_NO_ITEMS")

<?php echo JLayoutHelper::render('joomla.searchtools.default', array('view' => $this)); ?>