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Using conditional statements for customized effects

From: WordPress 3: Building Child Themes

Video: Using conditional statements for customized effects

In the previous movie we created a custom page template and remove the title from that template. However, the method I showed was a rather crude one. I copied a bunch of code, this code here, from a different template file, the contents-page.php file and pasted it directly into my custom page template. This is a quick and dirty way of doing things, but it's not necessarily the most effective way of doing it. Now I am going to show you a much cleaner and just as quick way of doing the same thing.

Using conditional statements for customized effects

In the previous movie we created a custom page template and remove the title from that template. However, the method I showed was a rather crude one. I copied a bunch of code, this code here, from a different template file, the contents-page.php file and pasted it directly into my custom page template. This is a quick and dirty way of doing things, but it's not necessarily the most effective way of doing it. Now I am going to show you a much cleaner and just as quick way of doing the same thing.

Rather than copying and pasting the code, I am going to use one of the many conditional tags built into WordPress, to test to see if were using a custom page template and then display the content accordingly. Conditional tags are simple if then statements that can help you consolidate a lot of code into a single template file, and that have the computer figure out what to display, and where to display it, and when to display it. The first thing I am going to do is reset my and no-title-page custom template file, back to the way it was originally.

I am going to delete all this code that I pasted and then I am going to find the original file I copied; that would be that page template file from the twentytwelve theme. And I will find the original call, here it is get_templete_part content page. Like I explained before, what happens here is WordPress says, hey there's a file that's called content-page and the contents from that file should go right here.

So when I save this custom page template and reload my page that's using it, you'll see the title is now back and all the content is too. The next thing I am going to do now is tell the file is being that's being called the content-page file, to display content differently, if we're using this page template. I am going to do that using conditional tags. Conditional tags are small functions built into WordPress that allow us to test for different scenarios, and then do things based on those tests. Basically you are saying things like if this is the homepage then do the following, if it's not, do something else.

In this case, we want to test for whether or not a certain page template is going to be used. We are going to test whether this is a page template and there's a conditional function just for that. It's called is_page_template and it's used the following way. You ask is_page_template, and then you define what page template you're looking for. So we are going to use this exact function here inside the template file. The template file in question is this one, content-page, and since I am going to make a change to it, I first need to copy it into my child theme.

So I'll copy it into child theme and then open it in my code editor. And then I need to find the content I want to change. It's this right here, the that has the title in it. It's right here, the_title. Now I am going to wrap this in a new function that uses a conditional statement. So I will start with php delimiter, then I will say if is_page_template and put in the name of the file I am looking for, no-title-page.php. I'll end my parentheses and I am putting curly bracket and then anything that's within the curly bracket will then be run if this is_page_template, and my PHP delimiter, so that HTML can run underneath it, and then I'll put the php delimiter back in and end my curly bracket.

So what happens now is when content page runs, it will go, hey, is this page template called no-title-page.php? If it is, then display the title. Which of course is exactly opposite of what we want, but I am just going to test to see that this works first, so I'll save content page, go back to my sites and reload the page that has the custom page template on it. As you can see we can still see the title. And if I go to a different page, you'll see that this page does not have title. It should say about here at the top but it doesn't.

So now I want to reverse it. I'll go back to my code and then I'll say exclamation point is_page_template. The exclamation point means not. So now we are saying, if this is not this page template then display this content. Otherwise, meaning it is the page template, do not display this content. I'll save content page again, reload the page that should have a title on it. Now you see the title right here, About, and then I can reload the page that should have a title and you see Welcomes disappears. So no title.

Using conditional tags, or even regular conditional if then statements in your child theme, you can turn on and off elements and functions at will to create highly customized behavior. I use conditional statements constantly in my sites, because they make the themes lean and clean, and make it easier to manage the template files. The rule of thumb here is this, if you want to show or hide something on a page or post and you're planning on making a new template, see if you can get the computer to test for a condition instead so you don't have to write out the entire new template.

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This video is part of

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

45 video lessons · 33466 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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