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https://github.com/garyjones/gamajo-template-loader

A class to copy into your WordPress plugin, to allow loading template parts with fallback through the child theme > parent theme > plugin.
https://github.com/garyjones/gamajo-template-loader

template wordpress wordpress-plugin

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A class to copy into your WordPress plugin, to allow loading template parts with fallback through the child theme > parent theme > plugin.

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README 

        
# Gamajo Template Loader



[![Code Climate](https://codeclimate.com/github/GaryJones/Gamajo-Template-Loader/badges/gpa.svg)](https://codeclimate.com/github/GaryJones/Gamajo-Template-Loader)



A class to copy into your WordPress plugin, to allow loading template parts with fallback through the child theme > parent theme > plugin.



## Description



Easy Digital Downloads, WooCommerce, and Events Calendar plugins, amongst others, allow you to add files to your theme to override the default templates that come with the plugin. As a developer, adding this convenience in to your own plugin can be a little tricky.



The `get_template_part()` function in WordPress was never really designed with plugins in mind, since it relies on `locate_template()` which only checks child and parent themes. So we can add in a final fallback that uses the templates in the plugin, we have to use a custom `locate_template()` function, and a custom `get_template_part()` function. The solution here just wraps them up as a class for convenience.



## Installation



This isn't a WordPress plugin on its own, so the usual instructions don't apply. Instead:



### Manually install class

1. Copy [`class-gamajo-template-loader.php`](class-gamajo-template-loader.php) into your plugin. It can be into a file in the plugin root, or better, an `includes` directory.



or:



### Install class via Composer

1. Tell Composer to install this class as a dependency: `composer require gamajo/template-loader`

2. Recommended: Install the Mozart package: `composer require coenjacobs/mozart --dev` and [configure it](https://github.com/coenjacobs/mozart#configuration).

3. The class is now renamed to use your own prefix, to prevent collisions with other plugins bundling this class.



## Implement class

1. Create a new file, such as `class-your-plugin-template-loader.php`, in the same directory.

2. Create a class in that file that extends `Gamajo_Template_Loader` (or the new prefixed name, if you installed via Composer/Mozart). You can see the Meal Planner Template Loader example class below as a starting point if it helps.

3. Override the class properties to suit your plugin. You could also override the `get_templates_dir()` method if it isn't right for you.

4. You can now instantiate your custom template loader class, and use it to call the `get_template_part()` method. This could be within a shortcode callback, or something you want theme developers to include in their files.



  ~~~php

  // Template loader instantiated elsewhere, such as the main plugin file.

  $meal_planner_template_loader = new Meal_Planner_Template_Loader();

  ~~~

* Use it to call the `get_template_part()` method. This could be within a shortcode callback, or something you want theme developers to include in their files.



  ~~~php

  $meal_planner_template_loader->get_template_part( 'recipe' );

  ~~~

* If you want to pass data to the template, call the `set_template_data()` method with an array before calling `get_template_part()`. `set_template_data()` returns the loader object to allow for method chaining.



  ~~~php

  $data = array( 'foo' => 'bar', 'baz' => 'boom' );

  $meal_planner_template_loader

      ->set_template_data( $data )

      ->get_template_part( 'recipe' );

  ~~~

  

  The value of `bar` is now available inside the recipe template as `$data->foo`.

  

  If you wish to use a different variable name, add a second parameter to `set_template_data()`:



  ~~~php

  $data = array( 'foo' => 'bar', 'baz' => 'boom' );

  $meal_planner_template_loader

      ->set_template_data( $data, 'context' )

      ->get_template_part( 'recipe', 'ingredients' );

  ~~~

  

  The value of `bar` is now available inside the recipe template as `$context->foo`.



  This will try to load up `wp-content/themes/my-theme/meal-planner/recipe-ingredients.php`, or `wp-content/themes/my-theme/meal-planner/recipe.php`, then fallback to `wp-content/plugins/meal-planner/templates/recipe-ingredients.php` or `wp-content/plugins/meal-planner/templates/recipe.php`.



* You can also pass the template loader object into the template as well:

  ~~~php

  $template_loader = new Your_Template_Loader();

  $template_loader->set_template_data(

      array(

		      'template_loader' => $template_loader,

    		  // Optional other data as needed.

	    )

  );

  ~~~

  Then in the template you can use:

  ~~~php

  $data->template_loader->get_template_part( 'recipe' );

  ~~~

### Meal Planner Example Class



```php