Wordpress Advance Technique

Wordpress Advance Custom Field 

Wordpress ACF

Wordpress Advance Custom Field 

Dynamic dropdown for select ACF

add_filter('acf/load_field/name=field_name', 'loadAdminCombo');

function loadAdminCombo( $field ){

$result = getList();

if (!empty($result)){

$lang = getCurrentLanguage();

foreach ($result as $key => $obj) {

$key = "prefecture_name_$lang";

$val = $obj->$key;

$field['choices'][$obj->prefecture_id] = $val;

}

}

  return $field;

}

Show from the database

function getList( ) {

global $wpdb;

$sql = "SELECT * FROM wp_our_data WHERE status = '1' ";

$results = $wpdb->get_results($sql);

return $results;

}

SQL for WP pagination 

function getPrefectureList($area=null, $limit=SCREEN_PREFECTURE_LIMIT, $page = 1 ) {

global $wpdb;

$param = "";

if($area){

$param = " AND area_id='".$area."'";

}

$sql = "SELECT * FROM wp_prefectures WHERE status = '1' ".$param;

if ($limit) {

$sql .= " LIMIT ".$limit;

$offset = ($page-1)*$limit;

$sql .= " OFFSET ".$offset;

}

$results = $wpdb->get_results($sql);

return $results;

}

Ajax in Wordpress

add_action("wp_ajax_{do_ajax}", "run_ajax");

add_action("wp_ajax_nopriv_{do_ajax}", "run_ajax");

function run_ajax(){

echo 'ajax-ok'; die;

//admin_url('admin-ajax.php?action={do_ajax}')

}

here 

> do_ajax is common action to be performed

> we can add multiple ajax endpoint change this variable

> Endpoint created is  : admin_url('admin-ajax.php?action={do_ajax}')

Wp retrieve GET param

$prama = get_query_var('param_name');

Wordpress Load script in Admin

function my_enqueue($hook) {

    wp_enqueue_script('admin_js', get_template_directory_uri() . '/js/admin.common.js');
}

add_action('admin_enqueue_scripts', 'my_enqueue');

Wordpress notes

3 technique Creating Custom page

- conditional approach if(is_page())
- template file with page- followed by slug or page id [page-*]
- custom template directly by  different page name . Then select that template from admin panel

function


- get_header(); //render header content
- get_footer();  // render footer content

The post function

- have_posts(); // return true/false
- the_post(); // return post
         - get_the_author();
         - get_the_date({php date string});

- the_content('continue reading..');  // for single post
- the_excerpt(); // use in view file result for all post
this will add input excerpt in admin post edit...
- get_the_excerpt(); // we need to add manual link to detail
- the_permalink();

- the_time('php_date_string'); // get posted date

-the_title();  // get title for post
- the_author();  // get author for post
- get_author_post_url({author_id});
- get_the_author_meta('ID');  // retirn author_id for given posi_id {ID}

To check for archive...

// url type
- is_category();  // if post has category boolean
- is_tag();
- is_day();
- is_month();
- is_year();

Category function

- get_the_category();  // return array of category for the post
- get_category_link({category_id}); // return category link

for loop to get single one..
$categories = get_the_category();
foreach($categories as $category) {
      $catname = $category-> cat_name ;
      $catId = $category->term_id;

}


Feature Image
function func_to_call_theme_support(){
// add feature image support
add_theme_support();

//image size
//add_image_size('thumb_name', width,height , true);
add_image_size('small_thumb', 120, 150 , true);
//crop image with 4th param
add_image_size('small_thumb', 120, 150 , array('left','top')); // crop form lrft top
add_image_size('banner_thumb', 120, 150 , array('left','top')); // crop form lrft top
// or we can crop from admin panel
}
add_action('after_setup_theme','func_to_call_theme_support');

//to use image in view file

- the-post_thumbnail('small_thumb');

Pages

- homepage template. page.php > front-page.php