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Hooking in a featured image

From: WordPress 3: Building Child Themes

Video: Hooking in a featured image

In the previous movie, we added a welcome message to the top of our index page so that when people visit the site they immediately get a welcome message. And this welcome message is coming from a separate page within WordPress. Now I want to take that a step further and add a featured image to the welcome message and then display that featured image alongside the welcome message here on the right. But this is a bit of a challenge, because we're now outside the loop. The loop is what runs down here in the index page.

Hooking in a featured image

In the previous movie, we added a welcome message to the top of our index page so that when people visit the site they immediately get a welcome message. And this welcome message is coming from a separate page within WordPress. Now I want to take that a step further and add a featured image to the welcome message and then display that featured image alongside the welcome message here on the right. But this is a bit of a challenge, because we're now outside the loop. The loop is what runs down here in the index page.

It shows all the different posts. But we created a special call that calls in content from a page to display above that. Now if I use the normal post thumbnail template tag to get a post thumbnail to appear, or a featured image to appear, what will happen is I'll see the featured image from the first post rather than a featured image from this page. What I need to do instead is tell the database to specifically grab the post thumbnail or featured image from this page and display it next to the overall content.

But I'm getting ahead of myself here. First I need to add a featured image to my page. So I'll go to the backend, go to Pages, Front Page, and add a featured image. So I'll add an image from my desktop, change the Title and Alternate Description, and set Use as featured image. Update the page and now the page has a featured image.

Now I need to call in that featured image in this new section that I have here on the top of my page. So I'll go to my child theme and open welcome.php, and from here I need to insert my featured image. But first I have to figure out how to call it. I want to use a function called get the post thumbnail. I want to use that function because with that function I'm allowed to provide an ID for a specific post or page and then say I want the featured image from this particular page. But where do I get that ID from? Well, if you remember, this page variable contains all the information from the database about our Front Page page.

So if I do this print_r thing again-- say I want to print everything from page, save it and refresh in my browser-- you'll see in here we have ID 114. This is the post ID for our page, so that's the number I want to use. That means I can call in that number in my new function. Because I want to insert a featured image and then not share that in all cases I will have a featured image, for example, if I pass this child theme onto someone else and they forget to apply a featured image to their Front Page post, they may not have a featured image.

I'm going to add in a conditional statement, if, and then I'll say get_the_post_thumbnail. And then I want to point to that particular ID, so I'll say page-> ID. Then we get the ID contained within the page that's from the Front Page. Do some clean up here, and then I need to end my conditional statement, endif. So now I'm saying if we have a post thumbnail attached to the page for this ID, so Front Page, put in the following

and then I'll repeat myself and say get_the_post_thumbnail($page->ID).

And because this function doesn't automatically display the content, I have to put echo in front of it. So now I am echoing the content from get_the_post_thumbnail with the page ID if it exists. Save it, reload the Front Page, and now we see the image of the cab and then the Welcome message underneath. This idea of specifying a post ID from which to call the featured image actually works for all sorts of content.

If you want to, you can use the post ID to call in titles, content, and whatever other post's info you want to from any post or page. That's what WordPress does normally. It goes to the database and says, hey, I want post number 85, give me all the content. But now you know how to do it yourself and as you can see, it's very easy to do.

Show transcript

This video is part of

Image for WordPress 3: Building Child Themes
WordPress 3: Building Child Themes

45 video lessons · 33006 viewers

Morten Rand-Hendriksen
Author

 
Expand all | Collapse all
  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

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