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WordPress 3: Building Child Themes

Adding pagination to index pages


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WordPress 3: Building Child Themes

with Morten Rand-Hendriksen
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  1. 6m 59s
    1. Welcome
      1m 6s
    2. Using the exercise files
      1m 34s
    3. What you need to know before watching this course
      1m 29s
    4. Getting the right tools for theme creation
      2m 50s
  2. 17m 2s
    1. What is a WordPress child theme and when should you use it?
      2m 38s
    2. Picking a parent theme
      3m 55s
    3. Making sure you have the Twenty Twelve parent theme
      1m 50s
    4. Creating and activating a basic child theme
      4m 20s
    5. Importing parent theme styles
      4m 19s
  3. 16m 2s
    1. Using the developer tools
      3m 53s
    2. Modifying existing styles
      4m 24s
    3. Adding space between paragraphs
      4m 7s
    4. Changing font family styles
      3m 38s
  4. 31m 47s
    1. Understanding the WordPress template hierarchy
      3m 12s
    2. Modifying existing templates
      2m 33s
    3. Moving the header image
      4m 29s
    4. Adding Related Posts feature to posts
      6m 26s
    5. Creating custom page templates
      5m 43s
    6. Using conditional statements for customized effects
      5m 41s
    7. Creating custom header, footer, and sidebar templates
      3m 43s
  5. 17m 5s
    1. Understanding the different index pages and what they do
      4m 6s
    2. Adding author, date, and time information to the index loop
      7m 15s
    3. Changing the appearance of category index pages
      5m 44s
  6. 43m 5s
    1. Introducing functions.php
      3m 24s
    2. Overriding existing functions
      3m 23s
    3. Adding pagination to index pages
      5m 49s
    4. Adding to existing functions
      3m 21s
    5. Adding a new footer menu to Twenty Twelve
      6m 24s
    6. Adding a new widgetized area to pages
      4m 9s
    7. Adding static content to the sidebar
      7m 44s
    8. Replacing existing functions
      2m 36s
    9. Adding a Google font through a function
      6m 15s
  7. 10m 24s
    1. Adding new featured image sizes
      5m 41s
    2. Adding featured images to posts and pages
      4m 43s
  8. 31m 1s
    1. Adding a welcome message to the front page
      1m 22s
    2. Displaying page content in an index page
      7m 42s
    3. Hooking in a featured image
      4m 34s
    4. Making the welcome message responsive
      6m 27s
    5. Restricting content to the first page of the blog
      4m 22s
    6. Adding a jQuery function to show or hide the welcome message
      6m 34s
  9. 10m 23s
    1. Adding a custom favicon
      3m 58s
    2. Adding a custom screenshot
      2m 29s
    3. Adding footer information
      3m 56s
  10. 7m 14s
    1. What to do when a child theme crashes your website
      4m 38s
    2. Updating parent and child themes
      2m 36s

Video: Adding pagination to index pages

Let's look at an example of how you can override an existing function found in twentytwelve and replace it with a whole new function in your child theme. Though they're standard in WordPress themes, I don't particularly like the Older posts and the Newer posts links at the bottom of index pages. You can see it down here at the bottom. It says Older posts. When you click on it you go to page two and then you get either Older posts or Newer posts. I much prefer proper pagination lists where I can see how many total pages there are, and I can navigate in a more advanced way.

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WordPress 3: Building Child Themes
3h 11m Intermediate Jun 23, 2011 Updated Nov 27, 2012

Viewers: in countries Watching now:

Create a child theme based on an existing parent theme in WordPress and change the functionality, presentation, or styling of your website. In this course, author Morten Rand-Hendriksen shows how to use the default WordPress theme, Twenty Twelve, as a basis for a new child theme and add custom menus; new headers, sidebars, and footers; and index pages with widgets and pagination to your site. The course also demonstrates how to add a responsive welcome message to your front page using PHP and jQuery, and how to edit the many templates found in a WordPress theme. Morten explains how to perform these changes using any code editor, the developer tools in the Chrome browser, and WordPress.

Topics include:
  • Picking a parent theme
  • Creating and activating a basic WordPress child theme
  • Using the developer tools
  • Changing the header image size
  • Using conditional statements for customized effects
  • Adding custom menus to the child theme and/or a template
  • Changing the default footer content
  • Adding featured images to posts
  • Changing the display of meta content (such as date, author, category, etc.)
  • Excluding categories from the front page with custom queries
  • Including functions from external files
  • Identifying and fixing common mistakes
Subjects:
Web CMS
Software:
WordPress
Author:
Morten Rand-Hendriksen

Adding pagination to index pages

Let's look at an example of how you can override an existing function found in twentytwelve and replace it with a whole new function in your child theme. Though they're standard in WordPress themes, I don't particularly like the Older posts and the Newer posts links at the bottom of index pages. You can see it down here at the bottom. It says Older posts. When you click on it you go to page two and then you get either Older posts or Newer posts. I much prefer proper pagination lists where I can see how many total pages there are, and I can navigate in a more advanced way.

Now I want to replace the existing function that creates this Older posts and Newer posts link with a proper navigation menu instead. twentytwelve comes with a function called twentytwelve_content_nav. If we go into functions.php and search for it--I'll just search for a content_nav; here it is--you'll see that the function down here is wrapped in a conditional statement that tests whether or not the child theme already has this function defined.

So all we need to do is create a new function in our child theme functions.php file, and that one will automatically override the function in the parent theme. So I'm going to copy the start of this function here, and then I'm going to go and create a new file, and I'll save it under my child theme folder as functions.php. Make sure it's a PHP file.

And here I'm going to start it with a php delimiter and end it with a php delimiter and then just put in a comment to explaining what it is, and then I can put in my new function here. Now, I know I don't need this variable nav_id anymore because I've done some experimentation before. All I'm going to do is define the function itself and then end the function, and if I just save this file now and reload my page in my browser, you'll see that I lost my navigation completely.

That's because my new function here is taking over and that function isn't doing anything. The next step is to find a function that will work the way I want it to, and for that I'm going to go to the all-powerful Internet. The great thing about open source is that a lot of people come up with good ideas and then they publish them online. I do that myself, and most people who work with WordPress will publish code snippets that you can just take and augment and use for your own purposes. For pagination I found this great article called How to build a WordPress Post Pagination without plugin at kriesi.at.

This is a solution I've used many times, though I've augmented it quite a bit, and this is the solution we're going to use in the theme now. If you read this article, you'll see the explanation of how the function works with code examples and also how the style works, and you can see how this all fits together so you get this nice navigation menu. What I have done for this course is I've supplied you with an alternate version of this code specifically for the twentytwelve child theme that you can copy out of the code snippets file and paste into your functions.php file.

So we'll go to the codesnippets file, scroll down to this chapter number, 5.3, and here you'll find the function. So I will copy it all out, go into my functions.php file, in my child theme, and I'll just paste all that code in. You see here it's quite a lot of code, and I've also added some extra comments here, along with a link directly to that original article, and I've made some small changes to it to make it work the way I want it to, but you're free to make changes to it yourself if you want to as well.

I'll save this and reload my page here, and you'll see now we have navigation here at the bottom. So we can jump between pages if we want to. Scroll down. And what's cool about this particular pagination solution is that if I go in and change my settings here so that it appears like we have a lot of content--I'll do that by going into Settings > Reading, and setting it so that we only see one post per index page-- you'll see that at the bottom of the page not only do we get the numbers, but we also get a Next button so you can jump to the next one, and you get this button at the end that takes you to the very end of the list.

But this doesn't look very good; I need some style to augment it so that it looks nice on my site. So I'll go back to my code snippets, scroll down, and here you'll find pagination styles that I've created specifically for this theme so that it works. We can copy that out, go up to the style sheet in child of twentytwelve, open the style sheet in your child theme, and then paste in the new styles. I'll paste them in here at the bottom. We see there's quite a few styles here that will style the different elements. Save that, reload your page again, and now you have a nice pagination bar here at the bottom that works exactly the way you would expect pagination to work.

Now you can see why using a properly built theme as your parent theme saves you a lot of time and headache. Because the twentytwelve_content_nav function was properly wrapped in a conditional statement, we have an easy time overriding it and adding in new functionality. As a result, we've now added a great new functional pagination system to all our index pages with minimal effort.

Find answers to the most frequently asked questions about WordPress 3: Building Child Themes.


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Q: The 2010 version of this course no longer covers installing BitNami. Can you provide directions?
A: Instructions on how to install WordPress using BitNami can be found at
 http://bitnami.org/stack/wordpress. Use the "Installer" option. 
It is pretty straight forward and almost impossible to mess up.

lynda.com also has a dedicated course on WAMP and MAMP (Installing Apache, MySQL, and PHP) that is relevant and you might find helpful.
Q:When looking to download PHP development tool at www.eclipse.org/pdt/, as advised by Morten, but when accessing the site via this link, the screenshot in the movie is very different from what it takes you to on the website.
A: Eclipse has a very active developer cycle and updates quite frequently. The interface changes all the time. I recommend using Notepad++ (Windows) or TextWrangler (Mac) instead. They perform the same function but are far less cumbersome to deal with.
Q: This course was updated on 11/27/2012. What changed?
A: This course was heavily revised to reflect changes to the default WordPress parent theme, Twenty Twelve, and updates to WordPress's functionality. The entire course was re-recorded to reflect changes to the interface. Then we added new movies on text styling, the Related Posts feature, and the welcome message features. There are also two brand new chapters, "Modifying and Adding Functions" and "Working with Featured Images." We recommend that members who have seen the whole course start again from the beginning to get the most benefit from this update.
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