wordpress - Order posts by date or keyword -

i want enable website visitors order wordpress posts on category page date posted or search keyword, how it's done on page:

http://www.steinwaymusical.com/news.php

i'd appreciate plugin recommendation or other suggestion knowledgeable people.

thank in advance!

wordpress has order , orderby options can use in query.

https://codex.wordpress.org/class_reference/wp_query#order_.26_orderby_parameters

<?php  $args = array('order' => 'asc', 'orderby' => 'name');  $query = new wp_query($args); while ( $query->have_posts() ) : $query->the_post();  // echo out title, excerpt endwhile;  ?>  

your example page uses variables.

?selsort=name_asc&txtkeyword=sdfsdf

so need create form method="get" submit data current page. then, using php, can check if data set (in case, selsort , txtkeyword). if either of set, put them query. can modify query resemble this:

 <?php      $args = array('order' => $_get['selsort'], 'orderby' => $_get['txtkeyword']);      $query = new wp_query($args);     while ( $query->have_posts() ) : $query->the_post();      // echo out title, excerpt     endwhile;      ?>