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WordPress 3: Building Child Themes

Adding featured images to posts and 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 featured images to posts and pages

Once you have featured images in your site, you can add them pretty much anywhere you want on the site. Because the featured image is directly associated with each post and each page, without being in the content body, you can display these images in a different way from regular images in the body. The key is to know how to call them up, and how to get the correct size when you do. I have shown you this several times before. In the twentytwelve theme, the general way in which a featured image is displayed is at the top here: top of the post, large image before anything else. But earlier in the course we created new category templates and in these templates those gigantic featured images look pretty weird.

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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 featured images to posts and pages

Once you have featured images in your site, you can add them pretty much anywhere you want on the site. Because the featured image is directly associated with each post and each page, without being in the content body, you can display these images in a different way from regular images in the body. The key is to know how to call them up, and how to get the correct size when you do. I have shown you this several times before. In the twentytwelve theme, the general way in which a featured image is displayed is at the top here: top of the post, large image before anything else. But earlier in the course we created new category templates and in these templates those gigantic featured images look pretty weird.

What I want to do now is add a smaller featured image here, next to the excerpt of the content in each post. To do that, we need to make some small changes to the content.php template and add in the featured image. First, I'll open content.php in my child theme and find out where I want to put in this content. What I want to do is put it next to the excerpt, and since I already have the conditional call to test for when the excerpt should be displayed, I'll just place it inside that conditional call.

I also want to place the featured image outside of the excerpt so that it'll float to the left of it. So I am going to add some new lines directly above the excerpt here, and then I can put in my featured image. But what I am going to do now is wrap the featured image call in a conditional call to make sure that we don't put in code when there is no featured image to show. So I'll start off with a php delimiter, and I'll end it, and then I'll make a conditional call. I'll say if, and here I'll use another conditional statement that comes with WordPress.

It's called has_post_thumbnail. Not surprisingly, all this function does is it checks whether or not the current post has a post thumbnail. If it has a post thumbnail, I'm going to echo out some information. So I'll print out figure and I'll give the figure a class, call it cat-thumb, because this is a thumbnail for the category. I'll then end my figure with another echo and then in between these two, I'll use the function that calls the post thumbnail.

If we scroll up here, you'll see we already have the function here in the file. It's called the_post_thumbnail. But this time I want to call a specific size of post thumbnail, so I am going to say the_post_thumbnail and then I'm going to put in a variable that defines what size I want. To refresh my memory, I'll go back to my functions.php file where I defined this new size and I'll scroll down here until I find the size. It's right here, add_image_size, and the name is category-thumb.

So I'll copy out category-thumb and paste that in here, and then finally, I have to end my conditional statement, so I'll say endif. I'll save this and now when I reload my category archive, I should see small category thumbs appear. But they don't look exactly right yet. I still have to float this to the left, and that's why I wrapped this figure class="cat-thumb" around it, so that I can now create a style for cat-thumb.

So I'll go to my style sheet, scroll down, add class cat-thumb, and then I'll say float: left; and I'll also give it a little bit of a margin, so margin, top margin 0, right margin 10 pixel, bottom margin 10 pixel and left margin 0. Then I'll close the style cat-thumb, save style.css, and reload my page again, and now you see the thumbnail hovers nicely to the left of the content. And just to make sure I didn't break anything, if we jump back to the front page, scroll down, you see we still have the gigantic featured image here, and if I go to the single posts, we still have the gigantic featured image here.

By adding featured images in strategic locations throughout your site, you both make your site look nicer and increase the chance of people reading more of your content.

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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