jquery filter in javascript in wordpress code example

Example 1: wordpress ajax filter code

add_action('wp_ajax_myfilter', 'misha_filter_function'); // wp_ajax_{ACTION HERE} 
add_action('wp_ajax_nopriv_myfilter', 'misha_filter_function');
 
function misha_filter_function(){
	$args = array(
		'orderby' => 'date', // we will sort posts by date
		'order'	=> $_POST['date'] // ASC or DESC
	);
 
	// for taxonomies / categories
	if( isset( $_POST['categoryfilter'] ) )
		$args['tax_query'] = array(
			array(
				'taxonomy' => 'category',
				'field' => 'id',
				'terms' => $_POST['categoryfilter']
			)
		);
 
	// create $args['meta_query'] array if one of the following fields is filled
	if( isset( $_POST['price_min'] ) && $_POST['price_min'] || isset( $_POST['price_max'] ) && $_POST['price_max'] || isset( $_POST['featured_image'] ) && $_POST['featured_image'] == 'on' )
		$args['meta_query'] = array( 'relation'=>'AND' ); // AND means that all conditions of meta_query should be true
 
	// if both minimum price and maximum price are specified we will use BETWEEN comparison
	if( isset( $_POST['price_min'] ) && $_POST['price_min'] && isset( $_POST['price_max'] ) && $_POST['price_max'] ) {
		$args['meta_query'][] = array(
			'key' => '_price',
			'value' => array( $_POST['price_min'], $_POST['price_max'] ),
			'type' => 'numeric',
			'compare' => 'between'
		);
	} else {
		// if only min price is set
		if( isset( $_POST['price_min'] ) && $_POST['price_min'] )
			$args['meta_query'][] = array(
				'key' => '_price',
				'value' => $_POST['price_min'],
				'type' => 'numeric',
				'compare' => '>'
			);
 
		// if only max price is set
		if( isset( $_POST['price_max'] ) && $_POST['price_max'] )
			$args['meta_query'][] = array(
				'key' => '_price',
				'value' => $_POST['price_max'],
				'type' => 'numeric',
				'compare' => '<'
			);
	}
 
 
	// if post thumbnail is set
	if( isset( $_POST['featured_image'] ) && $_POST['featured_image'] == 'on' )
		$args['meta_query'][] = array(
			'key' => '_thumbnail_id',
			'compare' => 'EXISTS'
		);
	// if you want to use multiple checkboxed, just duplicate the above 5 lines for each checkbox
 
	$query = new WP_Query( $args );
 
	if( $query->have_posts() ) :
		while( $query->have_posts() ): $query->the_post();
			echo '<h2>' . $query->post->post_title . '</h2>';
		endwhile;
		wp_reset_postdata();
	else :
		echo 'No posts found';
	endif;
 
	the ( ) ;
}

Example 2: wordpress ajax filter code

jQuery(function($){
	$('#filter').submit(function(){
		var filter = $('#filter');
		$.ajax({
			url:filter.attr('action'),
			data:filter.serialize(), // form data
			type:filter.attr('method'), // POST
			beforeSend:function(xhr){
				filter.find('button').text('Processing...'); // changing the button label
			},
			success:function(data){
				filter.find('button').text('Apply filter'); // changing the button label back
				$('#response').html(data); // insert data
			}
		});
		return false;
	});
});