Carregando scripts somente se um determinado shortcode ou widget estiver presente

Vocêpode usar afunção is_active_widget . Porexemplo:

 function check_widget() {
    if( is_active_widget( '', '', 'search' ) ) { // check if search widget is used
        wp_enqueue_script('my-script');
    }
}

add_action( 'init', 'check_widget' );
 

Para carregar o scriptnapáginaem que o widget é carregado apenas,vocêterá que adicionar o códigois_active_widget (),em sua classe widget. Porexemplo,consulte o widget de comentários recentepadrão (WP-Inclui/default-widgets.php,linha 602):

 class WP_Widget_Recent_Comments extends WP_Widget {

    function WP_Widget_Recent_Comments() {
        $widget_ops = array('classname' => 'widget_recent_comments', 'description' => __( 'The most recent comments' ) );
        $this->WP_Widget('recent-comments', __('Recent Comments'), $widget_ops);
        $this->alt_option_name = 'widget_recent_comments';

        if ( is_active_widget(false, false, $this->id_base) )
            add_action( 'wp_head', array(&$this, 'recent_comments_style') );

        add_action( 'comment_post', array(&$this, 'flush_widget_cache') );
        add_action( 'transition_comment_status', array(&$this, 'flush_widget_cache') );
    }
 

You can use the function is_active_widget . E.g.:

function check_widget() {
    if( is_active_widget( '', '', 'search' ) ) { // check if search widget is used
        wp_enqueue_script('my-script');
    }
}

add_action( 'init', 'check_widget' );

To load the script in the page where the widget is loaded only, you will have to add the is_active_widget() code, in you widget class. E.g., see the default recent comments widget (wp-includes/default-widgets.php, line 602):

class WP_Widget_Recent_Comments extends WP_Widget {

    function WP_Widget_Recent_Comments() {
        $widget_ops = array('classname' => 'widget_recent_comments', 'description' => __( 'The most recent comments' ) );
        $this->WP_Widget('recent-comments', __('Recent Comments'), $widget_ops);
        $this->alt_option_name = 'widget_recent_comments';

        if ( is_active_widget(false, false, $this->id_base) )
            add_action( 'wp_head', array(&$this, 'recent_comments_style') );

        add_action( 'comment_post', array(&$this, 'flush_widget_cache') );
        add_action( 'transition_comment_status', array(&$this, 'flush_widget_cache') );
    }

Só queria compartilhar uma solução quetrabalheino queme permitiu ser umpoucomais versátil comminhaimplementação. Em vez deter a verificação dafunçãopara uma variedade de códigos depouco,modificá-loparaprocurar um único shiccode quefaz referência a umafunção de script/estilo queprecisa serenfigual. Issofuncionarápara ambos osmétodosem outras classes (comoplugins quepodemnãofazerissoem si)e funçõesnoescopo. Basta soltar o código abaixono Functions.phpe adicione a seguinte sintaxe a qualquerpágina/post onde você deseja csse amplificadoresespecíficos; Js

Página/Post Syntax: [loadcssandjsfunction="(class-> Método/nome defunção)"]

Functions.php Code:

 function page_specific_CSSandJS( $posts ) {
  if ( empty( $posts ) )
    return $posts;

  foreach ($posts as $post) {

    $returnValue = preg_match_all('#\[loadCSSandJS function="([A-z\-\>]+)"\]#i', $post->post_content, $types);

    foreach($types[1] as $type) {
      $items = explode("->",$type);
      if (count($items) == 2) {
        global $$items[0];      
        if( method_exists( $$items[0], $items[1] ))
          add_action( 'wp_enqueue_scripts', array(&$$items[0], $items[1]) );
      }
      else if( !empty( $type ) && function_exists( $type ))
        add_action( 'wp_enqueue_scripts', $type );
    }
  }

  return $posts;
}
 

Issotambémpermitirá que você adicione quantos quiserem umapágina. Tenhaem mente que vocêprecisa de ummétodo/funçãopara carregar.

Just wanted to share a solution I worked on which allowed me to be a bit more versatile with my implementation. Rather than having the function check for a variety of shortcodes, I modified it to seek out a single shortcode that references a script/style function that needs to be enqueued. This will work for both methods in other classes (such as plugins that may not do this themselves) and in-scope functions. Just drop the below code in functions.php and add the following syntax to any page/post where you want specific CSS & JS.

Page/Post Syntax: [loadCSSandJS function="(class->method/function name)"]

functions.php code:

function page_specific_CSSandJS( $posts ) {
  if ( empty( $posts ) )
    return $posts;

  foreach ($posts as $post) {

    $returnValue = preg_match_all('#\[loadCSSandJS function="([A-z\-\>]+)"\]#i', $post->post_content, $types);

    foreach($types[1] as $type) {
      $items = explode("->",$type);
      if (count($items) == 2) {
        global $$items[0];      
        if( method_exists( $$items[0], $items[1] ))
          add_action( 'wp_enqueue_scripts', array(&$$items[0], $items[1]) );
      }
      else if( !empty( $type ) && function_exists( $type ))
        add_action( 'wp_enqueue_scripts', $type );
    }
  }

  return $posts;
}

This will also allow you to add as many as you want on a page. Keep in mind that you do need a method/function to load.

Obrigadopor compartilharesta dica! Issome deu umapequena dor de cabeça,porqueno começonãoestavafuncionando. Eu acho que há algunserros (talveztyps)no código acima has_my_shortcode e eu reescrevi afunção como abaixo:

 função has_my_shortcode ($postagens) {

        Se (vazio ($posts))
            retornarmensagens de $;

        $ shortcode_found=false;

 foreach ($posts como $post) {

 if (! (stripos ($post-egt;post_content,'[my-shortcode')===false)) {
                $ shortcode_found=true;
 intervalo;
            }
        }

 if ($ shortcode_found_found) {
            $this- > add_scripts ();
            $this- > add_styles ();
        }
        retornarmensagens de $;
    }
 

Eu acho que houve doisproblemasprincipais: o Break nãoestavanoescopo da declaração IF,e que causou o looppara sempre quebrarnaprimeiraiteração. O outroproblemaeramais sutile difícil de descobrir. O código acimanãofunciona se o shortcode é aprimeira coisaescritaem umpost. Eutive que usar o operador ===para resolverisso.

de qualquermaneira,muito obrigadopor compartilharestatécnica,ajudoumuito.

Thank you for sharing this tip! It gave me a little headache, because at first it wasn't working. I think there are a couple of mistakes (maybe typos) in the code above has_my_shortcode and I re-written the function as below:

function has_my_shortcode( $posts ) {

        if ( empty($posts) )
            return $posts;

        $shortcode_found = false;

        foreach ($posts as $post) {

            if ( !( stripos($post->post_content, '[my-shortcode') === false ) ) {
                $shortcode_found = true;
                break;
            }
        }

        if ( $shortcode_found ) {
            $this->add_scripts();
            $this->add_styles();
        }
        return $posts;
    }

I think there were two main issues: the break wasn't in the scope of the if statement, and that caused the loop to always break at the first iteration. The other problem was more subtle and difficult to discover. The code above doesn't work if the shortcode is the very first thing written in a post. I had to use the === operator to solve this.

Anyway, thank you so much for sharing this technique, it helped a lot.

Com o WordPress 4.7 Há outramaneira de conseguirissoem seu arquivo functions.php arquivo,

 add_action( 'wp_enqueue_scripts', 'register_my_script');
function register_my_script(){
  wp_register_script('my-shortcode-js',$src, $dependency, $version, $inFooter);
}
 

primeiro você registre seu script ,quenão éimpressoem suapágina,amenos que você sejafechada se o seu shortcode é chamado,

 add_filter( 'do_shortcode_tag','enqueue_my_script',10,3);
function enqueue_my_script($output, $tag, $attr){
  if('myShortcode' != $tag){ //make sure it is the right shortcode
    return $output;
  }
  if(!isset($attr['id'])){ //you can even check for specific attributes
    return $output;
  }
  wp_enqueue_script('my-shortcode-js'); //enqueue your script for printing
  return $output;
}
 

o do_shortcode_tagfoi introduzidono WP 4.7 e pode serencontradono nova documentação de desenvolvedores páginas.

with Wordpress 4.7 there is another way to achieve this in your functions.php file,

add_action( 'wp_enqueue_scripts', 'register_my_script');
function register_my_script(){
  wp_register_script('my-shortcode-js',$src, $dependency, $version, $inFooter);
}

first you register your script, which doesn't actually get printed on your page unless your enqueue it if your shortcode is called,

add_filter( 'do_shortcode_tag','enqueue_my_script',10,3);
function enqueue_my_script($output, $tag, $attr){
  if('myShortcode' != $tag){ //make sure it is the right shortcode
    return $output;
  }
  if(!isset($attr['id'])){ //you can even check for specific attributes
    return $output;
  }
  wp_enqueue_script('my-shortcode-js'); //enqueue your script for printing
  return $output;
}

the do_shortcode_tag was introduced in WP 4.7 and can be found in the new developers documentation pages.