How to create an AJAX call in WordPress step by step

WordPress essentially works thanks to PHP language that gets the requests from users and admins, processes these requests and finally constructs the results as HTML pages, ie, PHP sends to you the pages that you see in the browser. Request, process, results; it’s simple. Sometimes however, you need control some elements of the screen after the HTML page has been sent and displayed: a special message on the screen after a checkbox has been checked, the change of an image depending on a select field, etc. and you don’t want to make a new request again. You want that these little elements change on the screen without repeat the whole process of request, process, results… In these cases you need to use the AJAX technique.

The first historical reference to AJAX technique (Roman Villa at Halicarnassus, 4th century AD)

Beyond this more than dubious historical reference of the previous illustration 🙂 , AJAX is a technology of developement supported by javascript and designed precisely for doing these kind of tasks, ie, to comunicate the client site to the server side silently, without a complete requests, just with the execution of a concrete funcion or module on the server side with a few concrete results. Continue reading…

Creating a tree-type index of pages or TOC using wp_list_pages function

WordPress has the hability to works with nuclear posts and also with posts that can contain posts, ie, posts with hierarchical structure. Today we’re going to see how to create an list of the second ones, as an index of pages, Table of contents (TOC), etc.

Panzerbaum

As default, WordPress supports two different kinds of elements: posts and pages. The basic difference between them is that the first ones, are treated as individual elements, organized in a long linear list of elements (like the natural numbers 1, 2, 3, 4, for example) meanwhile the second ones have got a hierachical structure, ie, each element can contain elements that have also got hierarchical structure. Continue reading…

Creating WP help tabs in admin, plugins or themes pages

WordPress has got a help manager very simple, just a couple of functions, so you can easily use it for creating help screen for your own developements. Learn you step by step how the WP help manager works, and how to use it.

Creating WP helps for your plugins and themes

But before beginning to create our own WP help pages, first we should see the internal structure of the WP help manager that, basically has just got two modules. Continue reading…

How to detect when get_template_part() WordPress function fails

Nowadays, in most of modern WordPress themes, the function get_template_part() is one of their essential elements. It just takes review the structure of, for example the last official themes (…, Fourteen, Fifteen, Sixteen), to realize that WordPress themes have evolved, from a structure quite monolitic to a structure driven by content and formats. And one of the keys to this evolution is the get_template_part () function.

silent diversity

get_template_part() it’s actually an invaluable element of any modern WordPress theme that through its two parameters allows us to select dynamically what .php file (what part) is going to be loaded for displaying the current page (see the official documentation for further information) however, one of its characteristics is that Continue reading…

How to change the WordPress post updated messages of the edit screen

WordPress posts edit interface has got a good information messages system for all user actions. It doesn’t matter what is the done action, WordPress talks to us: draft saved, post updated, published… Actually, it’s a perfect information system if regulary you only publish posts or sometimes a new page, ie, if you have just got a blog but, when your website has other kinds of information (films, cats, recipies, products…) WordPress keeps saying “post updated” and in fact, you are editing an actor’s profile, or a recipe, or whatever, but not a post… Would not it be awesome that WordPress says “Actor profile updated”, or “Recipe improved” or any message more like the natural language? So, if you don’t want that WordPress talks like a machine, you need use post_updated_messages.

Some examples of WordPress post updated messages on the edit screen

I’m sure that if your website talks about recipes, or actor profiles (whatever that is not a post), you are used to use the WP function register_post_type but probably you don’t know that there is another option that works together with register_post_type that allows us also to change the information messages related with these new kinds of information Continue reading…

Strategies for URL redirection in WordPress front-end pages

I know that is not a common situation but sometimes it’s necessary to redirect the current page to another URL. Inside WordPress back-end is relatively simple but from the WordPress front-end templates that shows the Posts, Pages… It’s a little more complicated.

Change direction

In this article we’ll see some strategies for redirecting the URLs, all of them based in using the WP function template_redirectContinue reading…

Your plugins ready for WordPress PolyGlots

Perhaps, you are writing a new WordPress plugin and perhaps, you do want to translate it… If this is your case, there are two approaches: to translate the code via a code translator programme, for example PoEdit, or to use the translations WordPress system called PolyGlots.

Close up of the Rosetta Stone replica

In the first case –translating via an external programme– you just follow the general i18n WordPress developement recomendations for local languages but, if you have choosen WordPress PolyGlots plataform then, in addition to the general i18n rules, you have to do some little changes in the code of your plugin. In fact, there are not a lot of changes to do, just a few ones. Continue reading…

Configuring WordPress Automatic Background Updates

Automatic background WordPress updates were introduced in versión 3.7 and since then, this module has been maintaining your installation updated and ready for working however in some cases, you don’t desire that your WordPress installation changes without your permission. Perhaps for compatibility with a special developement addition, perhaps for some non updated but critical plugin or any other reason you do need to control manually the WordPress Updates. If this is your case then go ahead but rather it is much better to leave the maintenance module quiet.

Configuring WordPress Automatic Background Updates

As the official documentation explains about the Automatic Background Update Module, this module has 4 different Types of working. Continue reading…

Showing posts with different templates, the “single_template” filter

Habitualy, the WordPress template hierarchy for posts, uses a simple descendant decision tree for choosing which single_template.php file is going to be used for showing a single post. This decision tree is quite usefull so that, simply creating a .php file called like single, single-posttype, etc., it’s possible to control very accurately which template will be used for showing data.

Normal Decision Tree for Single Elements

However, in contrast of pages that each one can have its own template, ie, they have a very flexible decision rules, choosing the templates for posts is ruled by criterias more restrictive based in sets of elements Continue reading…

How to add the google-site-verification code or other API parameters to your WordPress themes

Webmasters Tools of Google is a set of useful utilities that allow you to control a lot of elements of your website and among them, specialy the reading of the list of your pages through the sitemap.xml file. It is really a fantastic tool for your SEO so I’m sure that you want to connect with it. For connecting your site with an specific Webmaster Tools account, google offers you several methods but, perhaps the easiest is the addition of an HTML meta tag in the HTML <head> of your pages containing the google-site-verification code. Today we’ll see a method for adding automatically this google-site-verification code in a theme and for extension, for adding any API codes, third party parameters, etc.

How to add the google-site-verification code or other API parameters to your WordPress themes

In fact, every day is more common to use APIs to access from your web to services offered by outside webs so I do really suppose you want to use easily the associated codes to all these APIs in your Themes. Continue reading…