WORDPRESS PLUGIN DEVELOPMENT PDF
WordPress Experience. ✤ Developing for WordPress since about (Can't remember the love Make sense of the many aspects of plugin development. Download this Wordpress Plugin development eBook free from Packt. Available in PDF, ePub and Mobi this page eBook will help you build powerful. WordPress plugins are bits of software that enable you to easily add different functionalities to your websites—from maps to charts, to contact Note: to be included in this list, each plugin must have Creating a child theme for your site can save you a lot of pain down the road. . Google Maps, PDF files and more. Like.
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If you can write WordPress plug-ins, you can make WordPress do just about anything.
Free PDF eBook: WordPress Plugin Development - Beginner's Guide
From making the site easier to administer, to adding the odd tweak or new feature, to completely changing the way your blog works, plug-ins are the method WordPress offers to customize and extend its functionality. This book will show you how to build all sorts of WordPress plug-ins from admin plug-ins, all the way to custom Widgets, and beyond!
Click below to start downloading this page eBook at no cost and get creating! Sign up to our emails for regular updates, bespoke offers, exclusive discounts and great free content. In this part, we are using SlidesJS for implementing the slider plugin. SlidesJS comes up with two CSS files for styles neccessary for look and feel of the presentation and including fonts.
Now we know the basics of including scripts and styles of the jQuery plugin inside the WordPress plugin. Generally we place the initialization code for a plugin, inline within script tags in static HTML files.
Shortcodes can be considered as an alias for reusable piece of code. First we have to define the common code inside a PHP function. Then we can access it anywhere in themes, plugins or page editor by using the alias given for function. Consider the code below for most basic use of WordPress shortcode.
First parameter is the name alias of the shortcode. Second parameter contains the function to be executed when the shortcode is requested. We return a simple string from the shortcode. Some developers like to directly print the output of the shortcode inside the function. You should always prefer returning output from function and printing externally as shown in the preceding example.
Folowing screen shows how you can use a shortcode inside the post or page editor in WordPress. In the previous example, we used the most basic form of shortcode. We can also have attributes and content in shortcodes to add additional features.
Consider the following shortcode with attributes and content. These types of shortcodes contain opening and closing shortcode tags. Information placed between the opening and closing tags is considered content and key-value pairs inside the opening tag is considered as attributes. Following code shows how we can extract these information inside the actual shortcode function.
Content and attributes of the shortcodes will passed as the default parameters to shortcode function. Handling attributes is not straightforward as content. We can use the extract function as shown here.
We define all the attribute with the default values.
If attributes are supplied with shortcodes, default value will be replaced by passes value. In the previous sections we discussed how scripts, styles and initialization code fits into a WordPress plugin.
Final part of the slider will be the actual HTML or images used as the content for sliding. Shortcodes will be the ideal method for providing slider content. Now we have integrated all the necessary parts into WordPress plugin. But we still have a slider with static content. Real power of plugin comes when we can add the slider content dynamically and create multiple sliders to use in multiple locations. Now you can download the static version of WordPress slider plugin here.
Copy the downloaded plugin into plugins folder and activate using the admin dashboard. You will be able to use the navigation button to see how sliding works. So try out the static version of slider plugin for multiple jQuery libraries using the following template we created throughout this tutorial. If you have installed the plugin and checked, you will notice that it occupies a full width of px.
And on our demo site the slider has overlapped the sidebar because of this. Question is, can you make it responsive on your own? In the next part we will be creating the actual integration of jQuery plugin into WordPress. Instead of just hard coding HTML or images inside unordered lists, we will be creating sections to upload images dynamically and create multiple sliders by selecting preferred images.
Until then I would like to suggest following resources to get an idea about the contents in the next part of this tutorial series. Integrate various other sliders using the technique we discussed today. I will explain how to make it dynamic and reusable in the next part.
Let me know about the type of sliders you tried and any difficulties you faced in applying the discussed technique. In the first part we identified the importance of WordPress plugins for you as designers and the basic structure of a plugin. Then we followed it up with the necessary coding required for developing plugins by creating a jQuery slider for WordPress. Now we are going to integrate it to WordPress.
Professional WordPress Plugin Development
I hope you have used the slider plugin and tried to fix the responsive issue we had in the demo. We got good responses containing the possible solutions. So we are going to start the third part by fixing the responsive issue in the slider.
Following is an image from demo we created in the previous part, illustrating the responsive issue. SlidesJS is designed to use px as its default width.
Most of the websites are designed in a grid with at least px width. So default SlidesJS slider will be responsive in full width pages. We are using the TwentyEleven theme in this demo. Therefore we have to adjust the slider according to our themes to make it responsive. CSS media queries can be used effectively to make the slider responsive. Slider container is defined as px for that particular width range. Basically what you have to do is adjusting the width of slider container based on your themes content area dimensions.
So the updated media queries to suit TwentyEleven theme are as follows. You can see that I have modified the widths of all the media queries to suit TwentyElevan theme container sizes. Make sure to add these styles for media queries into the example. We have completed the responsive version of static slider for WordPress. In the current version of the plugin, we are using the images inside the plugin folder. But we want to put our own images in an user friendly method. Also we should be able to create multiple sliders for different locations of our web sites.
Implementing these functionalities is not a very difficult task for people who are knowledgeable in working with PHP. But as designers you might find it a little difficult to understand if you have zero background about PHP.
So I am going to explain things as simple as possible to make it easy for you. So stay tuned and get ready with your code editor. Most of you will be familiar in working with WordPress posts.
Professional WordPress Plugin Development - PDF Free Download
WordPress posts are designed to write article, tutorials or some content for your website. Following image displays the post creation screen of WordPress. Usually we get fields like post title, post content, categories, featured image to insert necessary data for specific posts.
Basically custom post type can be considered as a special kind of post. We can use custom post types to create some amazing designs and features to WordPress. In this part we are going to use specific custom post type to create sliders. We have the capability to create unique designs for these post types and decide where we should display them. I assume that you have already installed and activated the previous version of the plugin we developed in the last part.
First we have to register a new post type for sliders. WordPress executes an action called init in its initialization process of a user request. We can call any function on the init action. Inside the function we have to define some labels and parameters for custom post types.
Labels will decide the text displayed on menu items and forms. There is a bunch of arguments to configure various features of a custom post type. First parameter to this function will be the name of the custom type. You can use any unique name for that. Next we pass the arguments as the second parameter.
Understanding the complete code and configurations is not necessary at this stage as a beginner in WordPress. Following is a preview of the custom post type section for Sliders once we include this code. As you can see, there is a separate section for Slider posts on the left menu and the label is converted into the text we used in the labels variable.
Each time you use this code with different function and unique post type, new section will be added to the left menu. Now try to use Sliders in the dashboard. We can use this section to create sliders. Our next task is to add images into sliders. We have to insert different images to each new slider. WordPress meta boxes can be used effectively to add additional fields to the slider creation screen. First parameter is a unique key for meta box followed by meta box title.
Third parameter is a new function to execute the meta boxes. Fourth parameter is the unique post type we created earlier and you can leave the final parameter to its default value of normal. Inside the function we get the available image values for the current slider from the database. In the initial loading, there wont be any existing images and hence the gallery images will be empty.
Then we create the fields for the images using HTML codes. I have used 5 text boxes here to enter 5 images for each slider. Now we can start uploading images to the slider. Then upload images as you do for normal posts. You should get a screen like the following once an image is uploaded. In the link to section on the right, you can select whether to use the image as an attachment or media file. Select media file to get the direct link to the uploaded image. Now copy the link and close the upload window.
Then insert the copied image url into the Image 1 field we created earlier. Continue this process for all the slides you want to appear in the slider. We have uploaded and inserted the images into the slider. Now images need to be saved to the database. We have to use a simple code to insert the data into the database as shown below.
Now when the slider is published, all the images will be saved to the database. Then click on the Sliders section from the left menu and you will get a list shown in the following image. You will be able to see a separate shortocde in front of each slider you create. You can use these to generate sliders once we complete the following section.
In the previous part we used a shortcode function to include images to the slider as shown in the following code. As you can see all the images are hard coded in this version. Now we have the option of using dynamic sliders as well as dynamic images. Now we use the post ID passed to the shortcodes to retrieve the images dynamically. Then we assign each image to the slider using a foreach loop.
Finally we return the resulted slider to be displayed inside our pages. Now we have completed our slider plugin for this part and you can try creating sliders with different images. Once created, copy the shortwcode from the list and insert into a post or page to see it in action.
In this part we completed the slider functionality. Now its dynamic and effective to suit various types of sections in your web pages. So in the next part we will be adding options to our slider to complete the initial part of this plugin development series. By the end of next part you will be able to create basic WordPress plugins for UI components using the techniques discussed here. Until then I hope you will practice these theories with different sliders.
In the previous part I asked you to fix the responsive issues in the slider. In this part I provided more questions to solve and learn. Try the following and let me know how it goes.
In this part I was forced to omit explanations for each and every code line due to the complexity it can cause for you as web designers. Your focus should be on using this code and creating different types of sliders as well as other components without worrying too much about the complex codes. By now you should be able to insert another type of slider into the same plugin with the instructions I gave on the Things to Focus sections.
Here we are going to complete the basic structure of a plugin by learning how to create a WordPress plugin settings page for our slider. Stay tuned as settings are an important part in customizing the functionality of a Plugin.
Note that in order to test the final version, you will have to install it on your WordPress installation. In any kind of system, configuration settings define the data which needs to be initiated before the system starts working. These settings determine the functionality and features of your system. Consider the SlidesJS slider, which we developed through the last three parts.
This slider is not going to suit every WordPress theme and not every designer is going to like the default features. In the next few sections we will be adding options in different ways to allow us to customize the plugin. SlidesJS comes with dozens of configuration options on its own. In this tutorial I am going to use a few of these configurations to help you understand the plugin settings creation process on WordPress.
Now we have identified the necessary settings to be included in the plugin. WordPress does not come with specially designed pages for plugin options.
I am going to use the admin menu page to implement the options. You will be able to see a screen like the following, once you include the above code in the plugin. First I have used five variables to get the current values of the settings from database. Initially all of those options will be empty and hence I have added default values as necessary.
Then the most important thing is the form action. Since we are creating an options page, we can use options. Afterwards we create the necessary fields for our configuration settings. The transition effect is designed as a dropdown box to contain the two effects in the SlidesJS slider.
We use checkboxes for both autoplay and play button options. A textbox will be used for transition duration. In a normal scenario we need to save these values manually once the form is submitted.
Fortunately WordPress provides a built-in method for updating options without using any additional code. All you have to do is specify two hidden fields in your form with predefined values.
The first field should be named action while its value should be update.
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