Posts Locator Order-by Filter tutorial ( part 1 )

gistfile1.txt

<?php
function gmw_orderby_dropdown( $gmw ) {
     
    //getting the chosen value so we could pre-select the selected value after page load
    $selected = ( isset( $_GET['gmw_orderby'] ) && !empty( $_GET['gmw_orderby'] ) ) ? $_GET['gmw_orderby'] : '';
    ?>
    <select class="gmw-orderby-dropdown" name="gmw_orderby">
        <option value="distance" selected="selected">Order By</option>
        <option value="distance" <?php if ( $selected == 'distance' ) echo 'selected="selected"'; ?>>Distance</option>
        <option value="post_title" <?php if ( $selected == 'post_title' ) echo 'selected="selected"'; ?>>Alphabetically</option>
        <option value="post_date" <?php if ( $selected == 'post_date' ) echo 'selected="selected"'; ?>>Post Date</option> 
        <option value="post_id" <?php if ( $selected == 'post_id' ) echo 'selected="selected"'; ?>>Post ID</option> 
        <option value="random" <?php if ( $selected == 'random' ) echo 'selected="selected"'; ?>>Random</option>
    </select>
    <?php
}
add_action( 'gmw_search_form_before_distance', 'gmw_orderby_dropdown', 20 );