acf-timezone_picker-v5.php

<?php

class acf_field_timezone_picker extends acf_field {


	/*
	*  __construct
	*
	*  This function will setup the field type data
	*
	*  @type	function
	*  @date	5/03/2014
	*  @since	5.0.0
	*
	*  @param	n/a
	*  @return	n/a
	*/

	function __construct() {

		/*
		*  name (string) Single word, no spaces. Underscores allowed
		*/

		$this->name = 'timezone_picker';


		/*
		*  label (string) Multiple words, can include spaces, visible when selecting a field type
		*/

		$this->label = __('Timezone', 'acf-timezone_picker');


		/*
		*  category (string) basic | content | choice | relational | jquery | layout | CUSTOM GROUP NAME
		*/

		$this->category = 'choice';


		/*
		*  l10n (array) Array of strings that are used in JavaScript. This allows JS strings to be translated in PHP and loaded via:
		*  var message = acf._e('timezone_picker', 'error');
		*/

		$this->l10n = array(
			'error'	=> __('Error! Please select a value.', 'acf-timezone_picker'),
		);


		// do not delete!
    	parent::__construct();

	}


/*
	*  render_field_settings()
	*
	*  Create extra settings for your field. These are visible when editing a field
	*
	*  @type	action
	*  @since	3.6
	*  @date	23/01/13
	*
	*  @param	$field (array) the $field being edited
	*  @return	n/a
	*/
	
	function render_field_settings( $field ) {
		
		/*
		*  acf_render_field_setting
		*
		*  This function will create a setting for your field. Simply pass the $field parameter and an array of field settings.
		*  The array of settings does not require a `value` or `prefix`; These settings are found from the $field array.
		*
		*  More than one setting can be added by copy/paste the above code.
		*  Please note that you must also have a matching $defaults value for the field name (font_size)
		*/
		
		acf_render_field_setting( $field, array(
			'label'			=> __('Default Timezone','acf-FIELD_NAME'),
			'instructions'	=> __('e.g. Country/City (Australia/Sydney)','acf-FIELD_NAME'),
			'type'			=> 'text',
			'name'			=> 'default_time_zone',
		));
	}


	/*
	*  render_field()
	*
	*  Create the HTML interface for your field
	*
	*  @param	$field (array) the $field being rendered
	*
	*  @type	action
	*  @since	3.6
	*  @date	23/01/13
	*
	*  @param	$field (array) the $field being edited
	*  @return	n/a
	*/

	function render_field( $field ) {

        /*
        *  Create a select dropdown with all available timezones
        */
        $utc = new DateTimeZone('UTC');
        $dt = new DateTime('now', $utc);
        $fieldValue = trim($field['value']);
	if(!$fieldValue && $field['default_time_zone']){
		$fieldValue = trim($field['default_time_zone']);
	}
        ?>
        <select name="<?php echo esc_attr($field['name']) ?>">
            <?php
            foreach (\DateTimeZone::listIdentifiers() as $tz) {
                $current_tz = new \DateTimeZone($tz);
                $transition = $current_tz->getTransitions($dt->getTimestamp(), $dt->getTimestamp());
                $abbr = $transition[0]['abbr'];
                $is_selected = $fieldValue === trim($tz) ? ' selected="selected"' : '';
                ?>
                <option value="<?php echo $tz; ?>"<?php echo $is_selected;?>><?php echo $tz . ' (' . $abbr . ')'; ?></option>
            <?php } ?>
        </select>
    <?php
    }
}


// create field
new acf_field_timezone_picker();

?>