WordPress：编辑子主题

Question

I want to edit some stuff on my website. I'm using a child theme and I plan to change some CSS and do some structural changes. I know the CSS is easy to change, as I only need to call the names of the classes or IDs and give the new values.

But, if I want to change things around in html, do I need to copy the whole code? Will I lose every change when the theme updates (as in: i copied and pasted the older version and now I need to copy and paste the new version )?

I don't know much about the names of things and how to describe them properly.

Answer 1

Make copies of the theme files in the parent theme you want to modify - such as index.php, category.php, etc - and move those to the child theme and edit them. The copies in the child theme will be used by WordPress rather than the same-named files in the parent. This includes file in folders, ie /css/style.css , so duplicate the file structure in the child theme, if needed.

The child theme will continue to use those files, even if/when the parent theme get updated. And that also means your child theme edits won't disappear, unless there are major structural/functional changes to the parent theme.

One exception to child theme file usage is functions.php :

Unlike style.css, the functions.php of a child theme does not override its counterpart from the parent. Instead, it is loaded in addition to the parent's functions.php. (Specifically, it is loaded right before the parent's file.)

See http://codex.wordpress.org/Child_Themes

Answer 2

Taken from Wordpress Doc - Child Themes :

If you want to change more than just the stylesheet, your child theme can override any file in the parent theme: simply include a file of the same name in the child theme directory, and it will override the equivalent file in the parent theme directory when your site loads. For instance, if you want to change the PHP code for the site header, you can include a header.php in your child theme's directory, and that file will be used instead of the parent theme's header.php.

Answer 3

Wordpress Child Theme can't have a child theme itself. It's not supported by Wordpress. I had the same problem before and after some searches I found this article .

It explains about creating a grandchild theme; from the article:

The solution is surprisingly simple. Instead of editing the child theme, create a grandchild theme. It's very similar to creating a child theme, except you do it via a plugin. You add your custom functions to the plugin, just as you normally would in functions.php (though remember your plugin will be called much earlier than functions.php, so you'll need to make sure that any code in your plugin only runs when an action is fired). Use the wp_register_style and wp_enqueue_style functions to add your CSS (by default a grandchild theme will add your CSS to the CSS of the parent or child theme, but you can change this behaviour by using the wp_dequeue_style function). Finally filter the result of the get_query_template function to control which PHP files are executed when a page is requested.

It's not really a child theme of a child theme, but a plugin including calls to add_filters or something similar to override the behaviour of the child theme. In this way upgrading child / parent themes will not affect the customisation you've made.