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Creating conditional custom taxonomy links

From: Create an Online Portfolio with WordPress

Video: Creating conditional custom taxonomy links

One of the great things about working with computers is that you can give them conditional statements or if/then instructions and have them do different things depending on what info they are provided. This is much used in web code because it gives designers and developers the ability to display different content depending on either what the browser is displaying or what the user does with it. In our case we can use conditional statements to display taxonomy links only if they're actually populated so we don't end up with something like the text :Meal type:: with no links next to it.

Creating conditional custom taxonomy links

One of the great things about working with computers is that you can give them conditional statements or if/then instructions and have them do different things depending on what info they are provided. This is much used in web code because it gives designers and developers the ability to display different content depending on either what the browser is displaying or what the user does with it. In our case we can use conditional statements to display taxonomy links only if they're actually populated so we don't end up with something like the text :Meal type:: with no links next to it.

To do this we're first going to ask the server, if there are any taxonomy terms available before we actually try to display them. If you've been paying really close attention, you may have noticed that there is one taxonomy item missing on this list. We have Meal type, Servings, Difficulty, and Ingredients, but we're missing that item that was called preparation time. So let's add the Preparation time but make it conditional depending on whether or not a preparation time is actually entered. So I'll go back to my file and first I'll just add the standard code. I'll just copy the first list and paste back in, then I'll make two changes.

I'll change the title to Preparation time and then I'll go and ask for the time taxonomy rather than Meal type. If I test this in the browser you should see it now says Meal type and then Preparation time and then Servings. But if we go into Pizza Primavera from behind the scenes and under Edit take out the Preparation time and save it, when we reload the page we'll now get Preparation time with no information.

That just doesn't look right. So we need to add that conditional statement in. So what we're going to do now is use that same function, get_the_term_list, and then tell WordPress to test whether or not get_the_term_list actually returns anything before we create the output. So I'll start right before the div, add a new line, and then I'll start with a PHP delimiter, and I'll make an if statement. So I'll say if (), then I'll say get_the_term_list, and it's still going to be the list from $post->ID and I'm looking for the time term, so it will be 'time'.

And what we're saying is if this does not return, so exclamation point means not and equals means equal, so if this, the term is not equals null, which means nothing, then display what's underneath. So I'll tab that in one so it's easier to read. And then we'll end the if statement with another PHP delimiter and I'll just end the curly bracket. So again what happens here is WordPress is asked if get_the_term_list return something other than nothing then display this.

However, if it does return nothing do nothing. If I save this and reload the page, and you'll remember right now it's empty, we now get nothing. So it says Meal type, Servings. But if we go back and enter a Preparation time, and save it and then reload the page again, Preparation time appears. Now that you see how well it works you're probably thinking the exact same thing I was when I built this.

This conditional statement should really be applied to all my custom taxonomies, just in case I forget to fill some out. So that's what I did in the code-snippets file. So if you go to the code-snippets file you'll find the entire stack of taxonomy displays with conditional statements for every single one. So we can copy this, go back and paste it in, and now after saving it and reloading the page, because all the taxonomies are filled out the old display, but if we go in and take one out, for instance Meal type, and update it you'll see that rather than displaying meal type and the nothing, Meal type just as disappears.

Subtle but important, and it brings in that extra level of professionalism. Using simple conditional statements we can use more consistent and less confusing output on our pages. The seemingly simple addition of a condition that prevents empty taxonomies from being displayed can be powerful because it helps avoid confusion and the perception of an error for the visitor.

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This video is part of

Image for Create an Online Portfolio with WordPress
Create an Online Portfolio with WordPress

40 video lessons · 28393 viewers

Morten Rand-Hendriksen
Author

 
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  1. 6m 28s
    1. Welcome
      58s
    2. Using the exercise files
      3m 54s
    3. Using the code snippets file
      1m 36s
  2. 8m 31s
    1. What is an online portfolio?
      2m 43s
    2. Tour of the finished project
      3m 15s
    3. Setting up a WordPress development environment
      2m 33s
  3. 16m 10s
    1. Creating site architecture
      5m 1s
    2. Creating a child theme
      6m 7s
    3. Creating an external file to manage functions separately from the theme
      5m 2s
  4. 25m 26s
    1. What is a custom post type?
      2m 14s
    2. Setting up a custom post type
      6m 39s
    3. Adding advanced variables to the custom post type
      3m 35s
    4. Advanced custom post type functionalities
      4m 29s
    5. Changing the menu position of the custom post type
      3m 19s
    6. Adding a custom post type icon
      5m 10s
  5. 22m 8s
    1. What are custom taxonomies?
      3m 34s
    2. Setting up a basic custom taxonomy
      2m 52s
    3. Hooking a custom taxonomy to a post type
      3m 13s
    4. Adding advanced variables to a custom taxonomy
      3m 9s
    5. Using hierarchical and nonhierarchical custom taxonomies
      5m 54s
    6. Using custom taxonomies in admin
      3m 26s
  6. 25m 40s
    1. Populating content into the custom post types
      10m 54s
    2. Uploading videos to YouTube
      2m 22s
    3. Embedding YouTube videos in a custom post type
      4m 23s
    4. Uploading videos to WordPress
      8m 1s
  7. 39m 47s
    1. Creating custom post type templates
      6m 50s
    2. Adding taxonomy info to the custom post type template
      9m 13s
    3. Creating conditional custom taxonomy links
      4m 46s
    4. Handling multiple post type templates: Individual templates
      6m 25s
    5. Handling multiple post type templates: Consolidating everything in one file
      6m 21s
    6. Handling multiple post type templates: Making custom post types the default
      6m 12s
  8. 15m 23s
    1. Creating an index page for a custom post type
      8m 10s
    2. Creating a custom taxonomy index page
      7m 13s
  9. 12m 3s
    1. Creating a custom footer sidebar template
      6m 58s
    2. Displaying a list of links to the latest custom post type posts
      5m 5s
  10. 14m 58s
    1. Creating static pages for the front and the blog
      4m 54s
    2. Populating the menu with new index pages
      4m 52s
    3. Creating a contact page with a contact form
      5m 12s
  11. 5m 55s
    1. Including the abstraction layer in other stock themes
      5m 55s
  12. 1m 22s
    1. Next steps
      1m 22s

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