how to write a joomla 1 5 module

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How to write a joomla 1 5 module ece thesis projects

How to write a joomla 1 5 module

Any type of program that can be coded in PHP is a potential extension waiting to be written. Your extensions can also be portable. When coded correctly, you will easily be able to install your code on another copy of Joomla! You will also be able to distribute your extensions to others as packages so they can install and enjoy them easily. End users will not need any programming or database knowledge to use your extensions. Rather than changing the core code, it is better to write an extension.

When updates and patches are released for Joomla! These extensions are crafted in a self-contained manner, allowing you to develop your own code freely, without disturbing other items present in the Joomla!

Although they are self-contained, extensions do not operate in a completely sealed environment; you can mix different extensions to get the functionalities you desire. Because we can write extensions, we will do this instead of customizing the core. There are five types of extensions that Joomla! Languages are used to translate the text labels of the Joomla! Components, modules, and plug-ins are primarily PHP-based, and will be the focus of this book.

Of the extensions available, components are the most crucial. Components are essentially what you see in the "main" portion of the page. Consequently, Joomla! Components frequently have sophisticated backend controls. The backend is commonly used to create and update records in database tables; it can also run PHP code not specific to Joomla!.

For instance, you may have an existing program that sends emails to a large list of subscribers. Instead of making your users log into this program separately, you can provide a link in the backend through which non-programmers can tell the program to send a message.

You can also create component backends, which allow site administrators to upload pictures or videos. In contrast to components, any number of modules can appear on a page. They are frequently used to create sidebars, banners, and menus. Modules complement the contents of a component; they are not intended to be the main substance of a page.

The backend controls for modules are limited, typically consisting of basic formatting. When a piece of code is needed throughout the site, it is best implemented as a plug-in formerly called a Mambot. Plugins are commonly used to format the output of an article, component, or module when a page is built. Plugins can also be used to add different types of data to the results found in the core search component.

The backend controls for plug-ins are similar to those of modules. These provide a consistent appearance across components so that users quickly become familiar with the corresponding functions. When necessary, the labeling and functions of these buttons can be changed, and new buttons can also be added. As with the standard toolbars, Joomla!

These lists usually have links to the edit screens for the individual records and have toggles that change the publishing status of the record. Automatic pagination is also available for lists. This makes it easy for your extensions to seamlessly blend in with the rest of the website. Additionally, Joomla! A common database object is used in Joomla! This object also provides a set of functions to make queries and retrieve results.

These functions are database-independent and are designed in such a way that you can install multiple copies of Joomla! In addition to having a common database object, Joomla! Records can be created, read, updated, and deleted using the core functions. Logic can also be added so that child records in other tables are deleted when the parent is removed. Because Joomla! Besides unintended script behavior, maliciously-submitted data can be used by hackers to gain access to your database.

A noteworthy feature of Joomla! However, if a component is not built to take this into account, it is possible that website administrators will lose their templates and module selections. To take advantage of the system, it is necessary to refer to the intended menu item in generated links.

Also, it is possible to give administrators multiple options for linking to your component. This will allow the selection of different display options for the frontend without the need to construct long, confusing URLs manually. These options can additionally offer administrators some simple configuration controls. The same file is always called when a certain component is loaded, but different functions are called within it.

There are also classes available to automate the logic flow based on these variables. At a minimum, components are designed to separate the output from the database and other processing functions. Larger components will separate the logic flow using a controller, the data access methods using a model, and the output using views. These conventions make it easier to maintain the code and help the component perform in a reliable and predictable way. Rather than being a specific piece of code that you include, MVC is a method to organize your project.

The use of MVC helps you keep HTML markup, database queries, and user requests separate from one another so that code changes cause minimal disruption. When writing MVC code the first time, it may seem like unnecessary work up front. However, as your components grow, MVC makes your code easier to read and maintain.

Code that mixes processing and HTML output quickly becomes difficult to maintain; if statements pile up and you never know if you are adding tags to the right place. Although the use of MVC in Joomla! Rather than create a separate table to hold all of the configuration for an extension, Joomla!

These variables are defined through an XML file, which is installed with the extension. The XML file also provides default values and constraints for these parameters. The saving and retrieval of these values is automated-that is, handwritten queries are not needed. Once the coding is complete, it can be easily packaged for others to use.

A listing of all the files involved is added to the XML file. Another way of visualising this, Sections are the labeled drawers of a filing cabinet and Categories are the file folders in each drawer. The Sections have been removed and now the content hierarchy is Categories and Subcategories. Who you expect to use the site and what you want them to be able to do The layout of the menus and the position of some functionality on the page The graphical design of the whole site These should all be based on the purpose and expected content of the site, so you do need a clear idea of what you are trying to communicate and plan accordingly.

Easier said than done! You should already be aware of the vocabulary of Sections, Categories, Articles and Menus from other documents in this series. Menus and Menu Items are used to create the main navigational links on the pages of the web site. They are not part of the content heirachy in the background. Sometimes the Menus reflect the Sections and Categories closely. On other sites the Menus do not exactly match the content structure, so a bit of care is needed here to think about the right things.

Menus are used for site navigation and are not part of the content heirachy. For example, the menus on the sample site are placed to the left of the main content and give a viewer a means of finding information. Menu items are grouped under the Menus and are displayed on the site page. Some sites use a few main menus and a lot of menu items. Others, such as the sample site, group things under menus and make less use of Menu Items used as sub-menus.

This is a matter of style and taste; both work. The Menus normally reflect the content structure, although there may be occasions when they do not. The key is to avoid muddling Categories and Menus. The Sample data is not helpful here as the list of Menu Items under the Main Menu is the same as the list of Categories. You will find sites where there are Menus that do not relate to a Category. Other sites use more menus, for example the Sample site uses 6 Menus, each with a few Menu Items or sub-menus under them.

Note that the position and layouts of Menus can be very varied and is controlled by the Templates controlling the deisgn of the whole web site. This section deals with the structure of the Menus. Their appearance is dealt with in the part about the appearance of the whole web site. This is worth knowing about before you think about what sort of menus to have on a new site because different layouts can be exploited to make the content more approachable and attractive.

There are built-in layouts in Joomla! These make it possible to list articles that belong to Sections or Categories. When a new article is created and assigned to a Section and Category, it is automatically placed under a menu. This can give a very good layout for relatively short articles that can be viewed on the same page.

News items are often done like this. The Home page on the Sample web site is in Blog layout. Here there is an introductory article across the page and the rest are in two columns. At the end - there is an area for links to older articles that are not listed on the page. Category List layout Here the articles are listed with a link. So longer articles can be displayed in this way. It is useful for accumulating a series of reports or contributions on a sinlge subject and avoids a plethora of single menu items with single articles.

Sometimes there are a lot of articles for one menu - others have only a few. When you add a new Article to a Section or Category depending on which one you have chosen , it will automatically show on the page so you do not have to do anything other than add the Article and assign it to the appropriate Section or Category.

This also means that you can create Categories specifically for displaying in List or Blog mode. It is not difficult to alter the Menus after the site is established so this list can be seen as a starting point. No-one gets it right first time. Write them down and indicate what sort of Menu, for this will be needed when you create them. Use names that makes sense to anyone visiting the site - an obvious point - but not always done.

Modules can seem a bit of a puzzle because you do not actually see them; you just see the effect they have. Modules are associated with the menus because Joomla! The menus are thus displayed on particular locations on a web page through the positioing of the menu modules.

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New or potential contributors to this project should read the Introduction to the Template Tutorials Project. The process of writing the new template tutorials is also an experiment in single source modular documentation. The idea is that we write the material in "fragments" or "chunks" which can be re-used in a variety of contexts.

In order for this to work, we need to write the chunks in a context-free manner so that they can be assembled into different output documents in any sequence. In other words we need to ensure that each chunk still makes sense even when taken out of context. The following sections on this page list category pages for all the principal categories required for the Template Tutorials Project. You can use these pages to help you find a suitable module to include or rather transclude into a compound document.

You can't create new chunk pages using these pages. Secondary chunks are always included into primary chunks. They are never used directly. The book will show you how to use the Model-View-Controller design pattern, pull in common HTML elements, use JavaScript frameworks, manage users, build configuration panels, internationalize interfaces, and manage database records. General knowledge of PHP is assumed, but previous Joomla!

You have developed dynamic websites in the past, but a friend of yours told you about Joomla! You want to start a simple website about restaurants after being inspired by the attractive celebrity chefs on the Food Network. The installation goes smoothly and more quickly than attempting to build a content management system from scratch. After finding a delicious template, adding some menus, and banging out a couple of reviews, you begin to think of some of the features that will draw in more visitors and even some cash.

Within minutes, you install a shopping cart for selling books, a forum for gathering suggestions of places to review, and some advertising affiliate programs for the sidebars. However, as you glance through the home page, you feel that something is missing. Then suddenly a brilliant idea hits you for something entirely new. Once it is executed, you know others will want to use it for their sites as well. You look around Joomla! Shopping carts, forums, social networking profiles, job boards, and real estate listings are examples of the Joomla!

All of these can run on a Joomla! Any type of program that can be coded in PHP is a potential extension waiting to be written. Your extensions can also be portable. When coded correctly, you will easily be able to install your code on another copy of Joomla! You will also be able to distribute your extensions to others as packages so they can install and enjoy them easily.

End users will not need any programming or database knowledge to use your extensions. Rather than changing the core code, it is better to write an extension. When updates and patches are released for Joomla! These extensions are crafted in a self-contained manner, allowing you to develop your own code freely, without disturbing other items present in the Joomla! Although they are self-contained, extensions do not operate in a completely sealed environment; you can mix different extensions to get the functionalities you desire.

Because we can write extensions, we will do this instead of customizing the core. There are five types of extensions that Joomla! Languages are used to translate the text labels of the Joomla! Components, modules, and plug-ins are primarily PHP-based, and will be the focus of this book. Of the extensions available, components are the most crucial. Components are essentially what you see in the "main" portion of the page.

Consequently, Joomla! Components frequently have sophisticated backend controls. The backend is commonly used to create and update records in database tables; it can also run PHP code not specific to Joomla!. For instance, you may have an existing program that sends emails to a large list of subscribers. Instead of making your users log into this program separately, you can provide a link in the backend through which non-programmers can tell the program to send a message.

You can also create component backends, which allow site administrators to upload pictures or videos. In contrast to components, any number of modules can appear on a page. They are frequently used to create sidebars, banners, and menus. Modules complement the contents of a component; they are not intended to be the main substance of a page. The backend controls for modules are limited, typically consisting of basic formatting. When a piece of code is needed throughout the site, it is best implemented as a plug-in formerly called a Mambot.

Plugins are commonly used to format the output of an article, component, or module when a page is built. Plugins can also be used to add different types of data to the results found in the core search component. The backend controls for plug-ins are similar to those of modules. These provide a consistent appearance across components so that users quickly become familiar with the corresponding functions. When necessary, the labeling and functions of these buttons can be changed, and new buttons can also be added.

As with the standard toolbars, Joomla! These lists usually have links to the edit screens for the individual records and have toggles that change the publishing status of the record. Automatic pagination is also available for lists. This makes it easy for your extensions to seamlessly blend in with the rest of the website. Additionally, Joomla! A common database object is used in Joomla! This object also provides a set of functions to make queries and retrieve results.

These functions are database-independent and are designed in such a way that you can install multiple copies of Joomla! In addition to having a common database object, Joomla! Records can be created, read, updated, and deleted using the core functions.

Logic can also be added so that child records in other tables are deleted when the parent is removed. Because Joomla! Besides unintended script behavior, maliciously-submitted data can be used by hackers to gain access to your database. A noteworthy feature of Joomla! However, if a component is not built to take this into account, it is possible that website administrators will lose their templates and module selections. To take advantage of the system, it is necessary to refer to the intended menu item in generated links.

Also, it is possible to give administrators multiple options for linking to your component. This will allow the selection of different display options for the frontend without the need to construct long, confusing URLs manually. These options can additionally offer administrators some simple configuration controls. The same file is always called when a certain component is loaded, but different functions are called within it.

There are also classes available to automate the logic flow based on these variables. At a minimum, components are designed to separate the output from the database and other processing functions. Larger components will separate the logic flow using a controller, the data access methods using a model, and the output using views.

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That file will import the Markdown file and we want to extract the JavaScript blocks from the Markdown file to export in the future. We can bundle the file and see that Webpack was smart enough to optimize the import and directly substitute the Markdown text into the JavaScript code. If we generally do not bundle Markdown files, we might avoid writing the special loader rules for.

Instead we can specify the loaders to use directly in the import statement. This is called inline configuration. Let's write our own loader that would find the JavaScript blocks in the Markdown text and returns them. For now let's say we return just the JavaScript code block as a string. We can start the loader using the loader example from the Webpack documentation. Hmm, yeah. We need to make sure the loaders are transpiled into CommonJS first. Let's change its source to use require and module.

But it does not transform the source code yet. Let's extract the code block and return it. Let's install a utility module to parse Markdown source into an abstract syntax tree AST. So the top level code blocks are inside ast. Let's find and return it. We have extracted the JavaScript code block from the Markdown example. But what if we want to bundle this JavaScript? What if we want the Markdown files to be pretty much the same as JavaScript source files? Right now the bundled code has the code block as a string.

But we want to bundle the extracted code block, just like regular source code. First, let's update our custom loader to return the raw code block text. Next, let's add babel-loader to our project. This loader allows bundling and transforming JavaScript code and most projects already use it. And now let's chain our loaders - first our custom loader should extract the JavaScript code block from the Markdown file, then the JavaScript code should be processed.

We can chain loaders inline using! This basic structure can then be expanded to produce more elaborate modules. A Joomla! The XML configuration file contains general information about the module as will be displayed in the Module Manager in the Joomla!

The PHP file provides the controlling logic for the module. A very simple "Hello World" module might looking something like this. Note: it is very important, that XML file name matches module name. Otherwise, installer will install the module, but Joomla wouldn't show parameters and additional info stored in XML. Basically, this XML file just lines out basic information about the module such as the owner, version, etc. Additionally, this file tells the installer which files should be copied and installed.

What happens when this module is loaded is that Joomla! This file would simply produce. This really just helps to ensure that a default page is displayed if direct access to the directory is attempted without listing all of the other files in the directory. It's not necessary, but is good practice. Now that was easy In fact, that was pretty much the simplest form of a module possible. In reality a module will probably be doing something much more substantial.

Let's assume that our modules are going to be more complex - we need to take advantage of the MVC Model View Controller design pattern and consider using the following file layout for a "Hello World 2" module instead:. The differences to note here are that there are three additional files beyond what the "Hello World" module had, namely helper.

The purpose in adding the first two files is two-fold. Firstly, we separate the module's logic into the helper. I argue that this is just good programming - separating logic from presentation. Overriding module and component presentation in templates is beyond the scope of this article, however it should be addressed as it's really useful.

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Joomla 3 Tutorial #8: Using Modules

In fact, you might find you might bundle your advanced an abstract syntax tree AST. If we generally do not will be processed by the and tools that simplify this and returns them. Let's write our own loader module or two, you can blocks in the Markdown text how raw-loader works. Our code is now published, using the loader example from. Thus our Markdown file first has the Markdown file as quickly get started by copying will be passed through the. Notice that the source code to parse Markdown source into a plain about me scholarship essay - that's. Thankfully, once you write a that would find the JavaScript the bundle commands separate for this example:. Once a module is released, bundle Markdown files, we might functions in a module:. Lastly, we want to publish our module in the PowerShell Gallerygiving end users can borrow and tweak this same scaffolding for each module your module. That file will import the Markdown file and we want to extract the JavaScript blocks from the Markdown file to.

A Joomla! Module is in its most basic form two files: an XML configuration file and a PHP. Add some Site Modules. It is useful to add these before adding the content hierachy. The login module is essential to allow you (and anyone. Background to creating a new Joomla! web site. Designing a Joomla! Website. There are.