How to load certain scripts only on single pages of custom post type in wordpress?

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This following fails to load the scripts in the single pages, 

if(is_single( ) ) add_action('wp_enqueue_scripts', 'build_js');

Suppose, If i use

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add_action('wp_enqueue_scripts', 'build_js');

the action is performed and scripts are loaded.

I need to perform the action only on single pages of a custom post type. How to do this?

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3 comments

  1. the problem is you have to check for the single page into the function: 

    function build_js(){
    if( is_single() && get_post_type()=='CustomPostTypeName' ){
        wp_enqueue_script(....);
    }
}
add_action('wp_enqueue_scripts', 'build_js');

    instead of 

    if(is_single( ) ) add_action('wp_enqueue_scripts', 'build_js');

  2. You can simplify the logic further with the WordPress function is_singular() instead.

    function build_js(){
  if( is_singular('CustomPostTypeName') ) {
    wp_enqueue_script(....);
  }
}
add_action('wp_enqueue_scripts', 'build_js');