oficinasuport-wp-plugin/includes/custom-field-ajuts-filter-function-frontend.php

<?php                                                                                                    
/**
 * Function to display the front end checkboxes for the ajut filter 
 *
 * references:
 * basic start
 * https://www.advancedcustomfields.com/resources/creating-wp-archive-custom-field-filter/
 * 
 * wordpress full form example
 * https://wordpress.stackexchange.com/questions/383599/form-checkbox-value-going-to-dynamic-url
 *
 * checkbox adaptation query
 * https://wordpress.stackexchange.com/a/102915
 *
 * form GET and POST
 * https://www.formget.com/php-checkbox/
 * 
 * @package Oficina_de_Suport_theme
 */
?>

<?php 
if( ! function_exists( 'ofisuport_ajuts_filters_form' ) ):
  function ofisuport_ajuts_filters_form() {
?>
    <div id="archive-filters" class="ofisuport-filters">
    <?php
    // output all possible values of a checkbox
    $groupkey = "group_63ab636898703"; // write here the key for the group of fields from acf
    if( $groupkey ) {
    ?>
      <?php // start the form ?> 
      <form id="form-ajuts" name="search-ajuts">

      <?php
      $groupkey_fields = acf_get_fields($groupkey);
      foreach( $groupkey_fields as $field_key ) {
		  
        if( $field_key['type'] == 'checkbox' ){

          // https://wordpress.stackexchange.com/a/102915
          $fields = get_field_object($field_key['key']);
          if( $fields ) {

            // check for values from meta fields db in url
            foreach( $GLOBALS['my_query_filters'] as $key => $fieldname ) {

              // check for values in url and  get value if available
              if( isset($_GET[ $fieldname ]) ) {

                $filteredvalues['value'] = explode(',', $_GET[ $fieldname ]);
		          };
		          //end check for values in url

              // construct the checkboxes
              if( $fieldname == $fields['name']) {
?>

        <section id="fund-filter-<?php echo $fields['name']; ?>" class="<?php echo $fields['name']; ?>"> 
          <h5><?php echo $fields['label'];?></h5>
            <?php  foreach( $fields['choices'] as $choicevalue => $choicelabel ) { ?>

          <div class="filter" data-filter="<?php echo $fields['name'];?>">
            <input
 class="ofisuport-filter"
 type="checkbox"
 <?php if( in_array($choicevalue,$filteredvalues['value']) ) { echo 'checked';}; ?>
 value="<?php echo $choicevalue ?>"
 name="<?php echo $fields['name'];?>" />
            <label for="<?php echo $choicevalue; ?>"><?php echo $choicelabel;?></label>
          </div>

            <?php };//end foreach fields['choices'] ?>

        </section>

        <?php  }; //end if fieldname == fields['name'] ?>
        <?php  // end of construct checkboxes ?>
                
           <?php }; // end check for values from meta fields db in url ?>

         <?php }; //end if field_key['key'] ?>
       
        <?php }; //end if type checkbox ?>

      <?php }; //end foreach groupkey field ?>
      <p><b>Results:</b> <span id="results"></span></p>
      <button type="button" name="submit-ajut" class="button-more">enviar</button> 
      </form>
<?php //close the form and subit ?>

<?php }; //end if groupkey ?>

</div>

<script type="text/javascript">




(function($) {
    // change
    //$('#archive-filters').on('change', 'input[type="checkbox"]', function(){
    $('#archive-filters').on('click', 'button', function(){

        // vars
        var url = '<?php echo home_url('ajuts/'); ?>';
            args = {};
            
        // loop over filters
        $('#archive-filters .filter').each(function(){
            urldos = url;     
            // vars
            var filteredajuts = $(this).data('filter'),
                vals = [],
                allvalueschecked = [];
              // find checked inputs
              $(this).find('input:checked').each(function(){
                vals.push( $(this).val() );
                var thisvaluechecked =  $(this).val();
                urldos += filteredajuts;
              });
            
            // append to args
            args[ filteredajuts ] = vals.join(',');
            alert( filteredajuts +'=' +args[ filteredajuts ]);
        });
        
        // update url
        url += '?';
        
        // loop over args
        $.each(args, function( name, value ){
            url += name + '=' + value + '&';
        });
        


        // remove last &
        url = url.slice(0, -1);
        
        // reload page
        //$('#archive-filters button').on('click', function () {
          alert( "estoy en: " +url );
          //window.location.replace( url );
        //});

    });

})(jQuery);
</script>

<?php 
  }; //end ofisuport_display_filters()
  endif; // end if ! functionexists
?>