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How do featured images (post thumbnails) work?

From: WordPress: Building Themes from Scratch Using Underscores

Video: How do featured images (post thumbnails) work?

Featured Images or Post Thumbnails as they used Before we start working with featured images, let me quickly When you create a post or a page, and you add content, including text, images, The featured image lives separately from the post content.

How do featured images (post thumbnails) work?

Featured Images or Post Thumbnails as they used to be called, are an important feature in WordPress. In the post editor, you add the featured image separately from your regular post content and you can only add one feature image per post. Where and how that featured image appears is entirely up to the theme designer and developer. Before we start working with featured images, let me quickly explain how they work and how we can use them. When you create a post or a page, and you add content, including text, images, and other elements, all that content is stored in a single field within the database table.

That means when you call the content using the function the_content you call all of the content. Images, text, video, whatever else is in the content. This works well if you want to display all the content in a single post or if you want to display the full content in your index pages. But, there are many times when you want to display just a part of your content. Or you want to display just an image from a post. Or you may want to display the image. Separated from the content in a different place.

Maybe on an index page or as a highlight on a single post. In those cases, you'll want to use the featured image instead. The featured image lives separately from the post content. That means you can use the post ID to call in the featured image or post thumbnail separately. And you use the function called the_post_thumbnail to do that. This also means you can use both the_post_thumbnail and the_content in the same page, or you can use the_post_thumbnail in combination with the excerpt or anything else and you can make truly custom experiences.

You can also define multiple different sizes of the featured image. And then call a specific size to a specific location. So you can define an index-thumb size of 700 by 250. That will be called in on index pages, and then a larger version of 1060 by 450, that you call single-thumb, that will be displayed on single posts. Each of these will be the same image, and WordPress will just crop them to fit within these sizes. The reason why featured images are called post thumbnails in the function is because they used to be used for precisely that, post thumbnails.

You display the featured image in the index next to the post title and excerpt, and then when you clicked the image, you were taken to the full article. Today we use featured images for much more. So, therefore, the name within WordPress admin has changed. But the function name stays the same so that it's backwards compatible. In the theme we're working with in this course, we're going to add a large optional featured image to the top of our single post view, and a smaller one to each post in the index pages.

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  1. 10m 55s
    1. Welcome
      1m 4s
    2. What to know before you start this course
      2m 40s
    3. How this course and the lesson files work
      3m 12s
    4. Introducing Simone: A preview of the final project
      3m 59s
  2. 21m 28s
    1. Installing and running WordPress on your computer
      3m 53s
    2. Getting and installing Underscores
      4m 11s
    3. Installing WordPress Theme Unit Test data
      4m 18s
    4. Installing the Developer plugin
      2m 58s
    5. Installing and setting up NetBeans or another IDE
      6m 8s
  3. 16m 15s
    1. Designing for mobile, content, and style
      4m 52s
    2. How do WordPress themes work?
      4m 48s
    3. Understanding the WordPress template hierarchy
      2m 19s
    4. Underscores: An overview
      4m 16s
  4. 37m 5s
    1. Setting up style.css
      4m 47s
    2. Configuring baseline settings and functions
      6m 6s
    3. Enabling custom fonts and font icons
      5m 44s
    4. Applying global styles
      5m 11s
    5. Styling basic layout components
      6m 19s
    6. Making the site layout responsive
      8m 58s
  5. 23m 18s
    1. Styling the default header
      6m 25s
    2. Hiding the site title and tagline
      5m 32s
    3. Adding an optional header image function
      5m 23s
    4. Placing the header image behind the site title
      5m 58s
  6. 40m 55s
    1. Setting up menus
      3m 12s
    2. Styling the menu
      7m 42s
    3. Using Superfish for accessible menus
      8m 0s
    4. Making the menu responsive
      7m 3s
    5. Creating a custom social media menu
      5m 51s
    6. Styling the menu with icons from Font Awesome
      9m 7s
  7. 18m 9s
    1. Adding the search form
      6m 27s
    2. Adding the search icon
      6m 55s
    3. Adding show/hide functionality to the search form with jQuery
      4m 47s
  8. 33m 20s
    1. Adding a widgetized area to the footer
      7m 10s
    2. Using the Monster widget plugin to test all widgets
      2m 11s
    3. Styling the footer
      3m 6s
    4. General widget styling
      5m 33s
    5. Adding custom styles to specific widgets
      7m 34s
    6. Using Masonry to make footer widgets responsive
      7m 46s
  9. 54m 49s
    1. Changing the Single Post Template content structure
      5m 54s
    2. Changing the output of meta elements
      7m 2s
    3. Styling the Single Post Template
      7m 57s
    4. Making post meta responsive
      6m 21s
    5. Styling blockquotes
      5m 39s
    6. Creating pull quotes and pull images
      5m 1s
    7. Working with image captions
      4m 27s
    8. Working with image galleries
      4m 57s
    9. Single-post navigation
      7m 31s
  10. 30m 23s
    1. Working with the comments template
      8m 42s
    2. Using Gravatars in comments
      2m 42s
    3. Styling comments
      7m 26s
    4. Highlighting post author comments
      3m 36s
    5. Styling the comment form and messages
      7m 57s
  11. 18m 43s
    1. How do featured images (post thumbnails) work?
      2m 57s
    2. Defining featured image sizes
      3m 30s
    3. Generating new featured images with a plugin
      1m 46s
    4. Adding featured images to a template
      5m 7s
    5. Styling the featured image
      5m 23s
  12. 1h 2m
    1. The index template hierarchy
      2m 21s
    2. Customizing and styling index templates
      10m 10s
    3. Displaying excerpts or full content on index pages
      3m 6s
    4. Adding a custom Read More link
      3m 48s
    5. Adding featured images
      4m 0s
    6. Creating custom pagination navigation
      6m 4s
    7. Highlighting Sticky Posts
      2m 55s
    8. Creating custom post format templates
      5m 30s
    9. Highlighting the most recent post in the index template
      7m 22s
    10. Embracing modular design
      2m 29s
    11. Working with archive.php
      5m 54s
    12. Customizing the search results and the 404 template
      8m 28s
  13. 9m 7s
    1. Styling pages
      3m 4s
    2. Creating custom page templates
      6m 3s
  14. 4m 30s
    1. Adding editor styles to match front-end styles
      4m 30s
  15. 2m 20s
    1. Further learning
      2m 20s

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