Preprocess and Process Functions . There are so many use cases where preprocess functions can make your life easier, your code more efficient, and your template files clean and crisp. If you haven’t used them before, either because you think you don’t need them or are afraid of delving too deep into PHP, you are truly missing out. We hope to change that. By now you are familiar with the general purpose of template files, which is mainly to provide markup and print variables. But what if you’d like to change those variables or add your own? Your first inclination might be to create a template file and do everything there, but that is often the wrong way to go. Preprocess functions were designed for this exact purpose. When implementing a preprocess or process function you are basically telling Drupal, “Hey, wait! How do I use theme preprocessor functions for my own templates? This Advanced Theming in Drupal 7 series picks up where the Theming Basics with., your bartik. Drupal 7; Drupal 8; Other projects; Develop for Drupal; Return to Content. Log in; Create account; Drupal API. I am trying to alter content of the system main block but only on the front page. I have added template? I have some changes to make to this data before you send it off for rendering.” It’s sort of like an editor getting a final review of an article before it’s allowed to be published. By definition, “preprocess” is a phase of processing that happens before templates are rendered. Excerpt from template. For example, if this preprocess function is being called for a node, this code will add the class node to this array. After this function runs, all modules and themes also have a chance to run it themselves and add or change any of the variables. Next up is the Node module, which implements template. As you can see in Listing 1. Listing 1. 6–2. Excerpt from template. Once all the preprocess functions have completed, the process functions have their chance. In Drupal core, there are only two process implementations for nodes: template. It contains a string version all of the classes provided in $classes. The $classes variable is printed in the class attribute of the wrapper < div> in the node. This is shown in Listing 1.
Listing 1. 6–3. Excerpt from template. The most important thing to understand is that in the theme layer, you’ve got the last call on all of these variables. You can easily add, modify, and remove any variables you please by simply implementing preprocess and process functions in your theme; this will be covered in more detail in the following pages. The big advantage of using preprocess functions is that they allow you to keep most of the logic outside of your template files. This allows for cleaner and easier to understand template files plus more efficient themes that are easier to maintain, manage, and extend over time. There are many changes you can make, such as affecting classes and modifying existing variables, that don’t require any changes to template files at all—just a few simple lines of code. Drupal 7. 0 Preprocess Page Templates - theme. At the time of writing this a lot of documentation appears to be non- existent or somewhat inaccurate. Documenting my own testing will hopefully save you a day of time on this. Zen. Another note to prevent frustration. I’m using the D7 Zen theme. If you’re not I suggest you do (or any theme framework) for a multitude of other reasons. Hiding Drupal 7 Page Titles using theme. If you want to hide the page title on only the front.Anyways, it’s possible that something I mention here only works because my theme is a sub- theme of zen which is actually enhancing functionality in places I’ve otherwise not realized. Page – Default and Custom Template Suggestions. This is an outline of built in and custom template suggestions. The custom ones are noted in the description. The chunk of preprocess. You’ll want to add this to your template. I mention here. Change it if you need to. This covers the front, taxonomy, views, and node displays if nothing is overriding it. This is the same as using page. This needs to be defined in a custom preprocess function as shown below. It preserves what I perceive to be a logical ordering by using array. This makes it so that you can still override page specific nodes (page–node–. You’re not limited to two, but your file names might get crazy if you have a lot of paths, long paths, or both. This is why I decided to make this one available separately. Personally I would rather use page–node–. However if you have a TON of these templates, I can see how it would be easier to browse your template directory by a more readable name. If you end up changing of the title of your node however (or the url. For now, these are the page taxonomy default template suggestions. Generic. Any taxonomy page. This is basically the same as using page–taxonomy. I believe the only difference might be in the fact that you have $content in your term. This means you’ve filled out your description or have created a custom field entity. Then this template will try to load. Again, assuming you’ve filled out the description term (or added additional fields) when you created that term. Having a term title and path alone didn’t appear to call this template up when I did my testing. Pages – Views. Views has its own template suggestions in which I wont get into here. On the page level, by default, the paths available to you are very much like those in which we’ve customized for page nodes above. They will be converted to dashes after they go through preprocessing. This is why with the suggestions as stated above you’d create the following templates (each additional one in this order one will override the last). Node Templatesnode. All nodes anywhere they’re displayed. This template is sometimes used several times on a page. On a taxonomy page listing for example. A few extend further on what I tested here so they might be useful to you to browse.
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