JText language doesnt work inside external ajax file

Question

I'm using an external ajax file to perfom an ajax call inside a module.( i didnt want to edit controller or make a subcontroller just for one call )

jQuery(document).ready(function($){
$(document).on('click', '.changeBtn',function(){
  var yo="<?php echo 'ip_searchmod_'.$unique_qsid; ?>";
  var text="<?php echo JText:: _('COM_IPROPERTY_THANASIS_ADV_SEARCH');?>";
  $.ajax({

    type:"POST",
    url:"/templates/spiti360/html/mod_ip_homesearch/ajaxChangeSimple.php",
    success: function(response){

      $('#' + yo).html(response);
      $('#' + yo).addClass('formSwapper');
      $('#top_search_form').addClass('divConSwapper');
      $('#swapper').addClass('simpleBtn');
      $('#swapper').removeClass('changeBtn');
      $('#swapper').text(text);
    }

  });

});
});

Ajax is working peftectly , my problem is that im using this JText:: _('COM_IPROPERTY_THANASIS_FOR_SALE'); inside the ajax file and it is echoed like : COM_IPROPERTY_THANASIS_FOR_SALE instead of For Sale . On the default.php file of module that language definition is working perfectly but not inside ajax file.

I tried to use language override from joomla administrator but it didnt work.

Inside ajax file i use the following includes:

require_once( JPATH_BASE . DS . 'includes' . DS . 'defines.php' );
require_once( JPATH_BASE . DS . 'includes' . DS . 'framework.php' );
require_once( JPATH_BASE . DS . 'libraries' . DS . 'joomla' . DS . 'factory.php' );

Do i have to include anything more for it to work ?

Answer 1

After you're require_once calls, add the following to initialise the applications:

$mainframe = JFactory::getApplication('site');
$mainframe->initialise();

Then load the component's language file:

$lang = JFactory::getLanguage();
$lang->load('com_iproperty', JPATH_ROOT);

I have guessed com_iproperty, so if it's not correct, please change it.