Hướng dẫn tạo themes cho wordpress part 14 pot

If you need more information on how to do this, see the recipe Creating a simple page template.. section of the Creating a simple page template recipe.. You pass other parameters as wel

wp_tag_cloud(array(

'number'=>3,

'unit'=>'',

'format'=>'list',

'orderby'=>'count',

'order'=>'DESC',

'taxonomy'=>$tax

));

}

?>

</div>

</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

You can now use your Taxonomies page template Go and create a new page in the WordPress administrative area, and make sure that it uses the Taxonomies page template If you need

more information on how to do this, see the recipe Creating a simple page template Visit

your newly-created page You should see output similar to the example shown in the

following screenshot:

How it works

By this time, you should have a pretty good idea of the way in which custom page templates

work If you need a refresher, see the How it works section of the Creating a simple page

template recipe.

Here you're taking advantage of the taxonomy system that has been built into WordPress since Version 2.3, as well as the custom taxonomy capabilities built into WordPress since Version 2.8 The taxonomy system essentially lets you classify objects in your system in ways that makes sense for your particular content If you're reviewing movies, it makes sense to classify them in Genres If you're looking at art, it makes sense to classify them by Periods After you've classified your content, you need to somehow let visitors navigate according to your custom taxonomies That is where this recipe comes into play In this recipe, you use a couple

of new functions First, you take advantage of the get_object_taxonomies function This function takes a single parameter that indicates the type of object that you want to retrieve taxonomies for, and returns an array of registered taxonomy names for that object type Next, you iterate over each taxonomy name, retrieve the appropriate taxonomy object, and then display the taxonomy label, and a list of all items in that taxonomy that have been used to classify objects

The function that you use to display the items in taxonomy is wp_tag_cloud Most people don't realize the full potential of this function, believing that it is only used for displaying post tags However, you can use wp_tag_cloud to display items from any taxonomy, by passing a taxonomy name in as a parameter

You pass other parameters as well, and it is important to know why you provide the values that you do:

number—used to limit the number of taxonomy items present in the list output unit—setting this parameter to an empty string ensures that all items are the same size

format—setting this parameter to the value list causes the output to be an unordered list

orderby—you can use different values here, but using count ensures that your taxonomy items are sorted by the number of objects they are assigned to

order—setting this to DESC makes the taxonomy items order themselves from high to low

taxonomy—the value here determines which object classification will be looked

at inside of the function

Internal to wp_tag_cloud is a complicated SQL query that looks at different taxonomy tables and the posts table, applies the options that you pass, and generates the appropriate output

An investigation into the internals of this function is beyond the scope of this book

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See also

Creating an archives page template

Creating a simple page template

Displaying author avatars and descriptions

Multi-author blogs are gaining momentum in the professional and business blogging world As such, if you're producing a business theme for WordPress, you might want to take special care

to produce a page template that displays information about each of the authors on a blog

In this recipe, you'll create such as page template This will show the author's display name, avatar, biography, and the number of posts that they've written for the site It will also contain

a link to that author's posts

Getting ready

To properly use the techniques in this recipe, you'll need to be working with a theme that you previously acquired or developed If you haven't started developing a custom theme yet, I recommend using the Thematic theme It can be freely downloaded from the WordPress.org Theme Repository at http://wordpress.org/extend/themes/thematic/

How to do it

First, follow the steps in the recipe Creating a simple page template until you reach the point

at which you start adding custom content While following that recipe, modify the filename from hello-world-page-template.php to authors-page-template.php, and change the value of the Template Name: header from Hello World to Authors

Now you're ready to start adding the appropriate content After the page template comment header, add the following markup to your page template, and then save the file:

<?php get_header(); ?>

<div id="container">

<div id="content">

<?php

$authors = get_users_of_blog();

foreach($authors as $author) {

$num_posts = get_usernumposts($author->ID);

if($num_posts>0) {

$id = $author->ID;

$author = new WP_User($id);

?>

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<div class="author" id="author-<?php echo $id; ?>">

<h2 class="author-name">

<?php

the_author_metắdisplay_namé,$id);

?>

</h2>

<div class="author-gravatar">

<?php

echo get_avatar($id);

?>

</div>

<div class="author-description">

<?php

the_author_metắdescription',$id);

?>

</div>

<div class="author-posts-link">

<a href="<?php

echo get_author_posts_url($id); ?>">

<?php

printf(

'%s has written %d posts Check \'em out!',

get_the_author_metắdisplay_namé),

$num_posts

);

?>

</a>

</div>

</div>

<?php

}

}

?>

</div>

</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

You can now use your Authors page templatẹ Go and create a new page in the WordPress administrative area, and make sure that it uses the Authors page templatẹ If you need more

information on how to do this, see the recipe Creating a simple page templatẹ Visit your

newly-created pagẹ You should see output similar to the following, depending on the authors that you have on your site:

In the above screenshot, you see numerous authors with their name, description, avatar, and a link to their posts The information could be expanded upon, but this is a good

starting point

How it works

By this point you should have a pretty good idea of the way that custom page templates

work If you need a refresher, see the How it works section of the Creating a simple page

template recipe.

There are a few functions of note in this recipe, nearly all of them dealing with the retrieval

of author data The code listing starts with the get_users_of_blog function This function returns an array of user objects, one for each user currently in the system Next, you iterate over the array of users, checking to see whether they have published any posts or not If an author has published at least one post, then you proceed with displaying various user data

Here, user data is displayed by using the the_author_meta function with different parameters and the value of the user ID for the author currently being iterated over In ađition, the get_ avatar function is used to display the appropriate image for each author All of the data for each author is wrapped in a nice set of HTML tags that provide proper formatting and displaỵ

Therés morẹ

If yoúre going to display information for each author on a dedicated page, you should probably redisplay that information on their individual author listings as well You already have the proper markup, so this will be a piece of cakẹ

First, separate out the display code for an author into its own filẹ You could call this file something like author-expanded.php It will contain the following code:

<div class="author" id="author-<?php echo $id; ?>">

<h2 class="author-name">

<?php

the_author_metắdisplay_namé,$id);

?>

</h2>

<div class="author-gravatar">

<?php

echo get_avatar($id);

?>

</div>

<div class="author-description">

<?php

the_author_metắdescription',$id);

?>

</div>

<div class="author-posts-link">

<a href="<?php echo get_author_posts_url($id); ?>">

<?php

printf(

'%s has written %d posts Check \'em out!',

get_the_author_metắdisplay_namé,$id),

$num_posts

);

?>

</a>

</div>

</div>

Now go back to your authors-page-template.php, and change it to use the

newly-created file, leaving you with something like the following:

<div id="container">

<div id="content">

<?php

$authors = get_users_of_blog();

foreach($authors as $author) {

$num_posts = get_usernumposts($author->ID);

if($num_posts>0) {

$id = $author->ID;

$author = new WP_User($id);

include(STYLESHEETPATH.'/author-expanded.php');

}

}

?>

</div>

</div>

After that, open up your theme's author.php file (if you don't have one, just create one and copy the contents of index.php into the new file) Immediately before the posts listing, insert a call for the expanded author information Your code should look something like the following example:

<?php

global $wp_query;

$id = $wp_query->get_queried_object_id();

$author = new WP_User($id);

$num_posts = get_usernumposts($id);

include(STYLESHEETPATH.'/author-expanded.php');

if(have_posts()) { while(have_posts()) {

the_post();

Call up an author's post page, and you'll see the expanded author information, followed by a list of that user's posts:

See also

Creating a simple page template

Creating a table of contents page template

Let's say you're writing a book where you publish each chapter as it is finished You're going to use WordPress pages for your content organization, with a top-level page describing the book and then a subpage for each of the chapters in your book

On the top-level page, in addition to the book title and description, you want to display links to each of the chapters, and a brief description of their content This task would be difficult with

a lot of other content management systems, but not with WordPress

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Getting ready

To properly use the techniques in this recipe, you'll need to be working with a theme that you previously acquired or developed If you haven't started developing a custom theme yet, I recommend using the Thematic theme It can be freely downloaded from the WordPress.org Theme Repository, at http://wordpress.org/extend/themes/thematic/

How to do it

First, follow the steps in the recipe Creating a simple page template until you reach the point

at which you start adding custom content While following that recipe, modify the filename from hello-world-page-template.php to toc-page-template.php and change the value of the Template Name: header from Hello World to Table of Contents Now you need to create the appropriate content that will be displayed when using this page template Create a top-level page for your book with the work's title as the post title, and choose the Table of Contents template from the Template drop-down menu in the Attributes meta box Then create several child pages, using the chapter's title as the post title For each child page, make sure that you choose your main book page from the Parent dropdown and the Table of Contents option from the Template dropdown When you're done, visit the Edit Pages interface, and you should see something like the example shown in the following screenshot:

Chapter order

When you're creating your book's chapters, make sure that you set the Order property in the Attributes meta box (the same place that you change the page template) to the number of the chapter This ensures that your chapters appear in the correct order

Now you're ready to write the code to generate your table of contents After the comment header, add the following markup to your page template, and then save the file:

<?php get_header(); ?>

<div id="container">

<div id="content">

<?php

if(have_posts()) {

while(have_posts()) {

the_post();

?>

<h2 class="book-title"><?php the_title(); ?></h2>

<div class="book-description">

<?php the_content(); ?>

</div>

<h2>Chapters</h2>

<ol>

<?php

$chapters_query = new WP_Query(array(

'post_type'=>'page',

'post_parent'=>get_the_ID(),

'orderby'=>'menu_order',

'order'=>'ASC'

));

if($chapters_query->have_posts()) {

while($chapters_query->have_posts()) {

$chapters_query->the_post();

?>

<li class="chapter">

<h3 class="chapter-title">

<a href="<?php the_permalink(); ?>">

<?php the_title(); ?>

</a>

</h3>

<?php the_excerpt(); ?>

</li>

<?php