I'm trying to have a multi-select where users can select which categories they want in a template. The functionality i want is similar to the "Select" field type but only pulling through categories to display NOT posts of those categories.
I've got the multi-select working fine and high-lighting the selected options of that page but in the templates, the values are not displayed using:
<?php var_dump(get_field('featured_tags')); ?>
The full code of the custom field type below:
<?php
class acf_Section extends acf_Field
{
/*--------------------------------------------------------------------------------------
*
* Constructor
*
* @author Elliot Condon
* @since 1.0.0
* @updated 2.2.0
*
*-------------------------------------------------------------------------------------*/
function __construct($parent)
{
parent::__construct($parent);
$this->name = 'section';
$this->title = __("Section",'acf');
// filters (for all fields with choices)
add_filter('acf_save_field-select', array($this, 'acf_save_field'));
}
/*--------------------------------------------------------------------------------------
*
* create_field
*
* @author Elliot Condon
* @since 2.0.5
* @updated 2.2.0
*
*-------------------------------------------------------------------------------------*/
function create_field($field)
{
// vars
$defaults = array(
'value' => array(),
'multiple' => 0,
'allow_null' => 0,
'choices' => array(),
'optgroup' => 0,
);
$field = array_merge($defaults, $field);
// no choices
if(empty($field['choices']))
{
echo '<p>' . __("No choices to choose from",'acf') . '</p>';
return false;
}
// multiple select
$multiple = '';
if( $field['multiple'] )
{
// create a hidden field to allow for no selections
echo '<input type="hidden" name="' . $field['name'] . '" />';
$multiple = ' multiple="multiple" size="5" ';
$field['name'] .= '[]';
}
// html
echo '<select id="' . $field['id'] . '" class="' . $field['class'] . '" name="' . $field['name'] . '" ' . $multiple . ' >';
$args = array(
'orderby' => 'name',
'parent' => 0,
'taxonomy' => 'sections',
);
$categories = get_categories($args);
$field['choices'] = '';
foreach($categories as $cat) {
$selected = '';
if(is_array($field['value']) && in_array($cat->term_id, $field['value']))
{
// 2. If the value is an array (multiple select), loop through values and check if it is selected
$selected = 'selected="selected"';
}
echo '<option value="'.$cat->term_id.'" '.$selected.'>'.$cat->name.'</option>';
}
echo '</select>';
}
/*--------------------------------------------------------------------------------------
*
* create_options
*
* @author Elliot Condon
* @since 2.0.6
* @updated 2.2.0
*
*-------------------------------------------------------------------------------------*/
function create_options($key, $field)
{
}
function update_value($post_id, $field, $value)
{
// save value
parent::update_value($post_id, $field, $value);
}
/*--------------------------------------------------------------------------------------
*
* pre_save_field
* - called just before saving the field to the database.
*
* @author Elliot Condon
* @since 2.2.0
*
*-------------------------------------------------------------------------------------*/
function acf_save_field( $field )
{
// vars
$defaults = array(
'choices' => '',
);
$args = array(
'orderby' => 'name',
'parent' => 0,
'taxonomy' => 'sections',
);
$categories = get_categories($args);
$field = array_merge($defaults, $field);
foreach($categories as $cat) {
$field['choices'] .= $cat->term_id.' : '.$cat->name."\n";
}
// check if is array. Normal back end edit posts a textarea, but a user might use update_field from the front end
if( is_array( $field['choices'] ))
{
return $field;
}
// vars
$new_choices = array();
// explode choices from each line
if( $field['choices'] )
{
// stripslashes ("")
$field['choices'] = stripslashes_deep($field['choices']);
if(strpos($field['choices'], "\n") !== false)
{
// found multiple lines, explode it
$field['choices'] = explode("\n", $field['choices']);
}
else
{
// no multiple lines!
$field['choices'] = array($field['choices']);
}
// key => value
foreach($field['choices'] as $choice)
{
if(strpos($choice, ' : ') !== false)
{
$choice = explode(' : ', $choice);
$new_choices[trim($choice[0])] = trim($choice[1]);
}
else
{
$new_choices[trim($choice)] = trim($choice);
}
}
}
// update choices
$field['choices'] = $new_choices;
// return updated field
return $field;
}
/*--------------------------------------------------------------------------------------
*
* get_value_for_api
*
* @author Elliot Condon
* @since 3.1.2
*
*-------------------------------------------------------------------------------------*/
function get_value_for_api($post_id, $field)
{
$value = parent::get_value($post_id, $field);
if($value == 'null')
{
$value = false;
}
return $value;
}
}
?>
