Joomla
Joomla! is a free and open-source content management system (CMS) for publishing web content. It is built on a model-view-controller (MVC) web application framework that can be used independently of the CMS that allows you to build powerful online applications.
JoomlArt T4 Template Framework
Building layout is the most important work of template or website development. It is very easy to build from basic to complicated layout with T4 Layout Builder. T4 Framework is a powerful and advanced responsive template framework for Joomla. It is a modern, flexible and highly customizable framework to build beautiful Joomla websites easier.
Add Backend Toolbar and Actions in Joomla
In Joomla, the administrator interacts with components through a toolbar. Toolbar is a collection of action buttons. It also creates a title for the component.
Different Types of Models in Joomla
There are five types of models that can be used in a component. To create a model in your component, extend one of the abstract models provided by Joomla. The models can be found in the Joomla\CMS\MVC\Model namespace:
Add a Menu Type to Joomla Site Part
After the component is installed, you can create a menu Item to access it. This allows to access the component through a menu rather than having to remember what to type into the address bar. Each view and layout can have its own menu item.
Joomla Template Layout File
This file holds the template for the page. It is used to render the page utilising the setup done by the view object. When no specific layout is requested for a view, Joomla! loads the template in the default.php file.
Joomla HTML View
This is the MVC view object. The job of a view object is to handle the setup work for a view template - selecting a layout, fetching Javascript, generating toolbars, and so on.
Joomla Display Controller
The display controller is the main controller file for the component. As the component grows in complexity, a page's controller handles model fetching, form submissions, and so on.
SQL Queries During Component Install, Uninstall and Update
During the install, uninstall or update phase of a component, you can execute SQL queries through the use of SQL text files.
Joomla Application Object
With the JApplicationCMS, you can access many things in Joomla. For example, you can access configuration, input variables, menu or enqueue messages which are shown to the user.
Joomla Coding Standards
Good coding standards are important in any software development project. These standards are even more important when a large, diverse and worldwide community of developers are contributing to a project.
Joomla range Form Field Type
The range form field type provides a horizontal slider for numeric input. While the default value can be set, there is no indication of the actual value being chosen, just the position of the slider's thumb. It is available from Joomla 3.2 version.
Joomla spacer Form Field Type
The spacer form field type provides a visual separator between parameter field elements. It is purely a visual aid and no field value is stored.
Joomla tag Form Field Type
The tag field type provides a field where you can enter tags, either AJAX or nested. This field type can be used after Joomla 3.1 version.
Joomla meter Form Field Type
It draws a progress bar based on Bootstrap. This form field is not an input type. It just creates a progress bar. It was introduced from Joomla 3.2 version.
Joomla number Form Field Type
The number form field type provides a HTML5 text box with arrows. If the field has a value saved, this value is displayed when the page is first loaded. If not, the default value (if any) is used. This field is available from Joomla 3.2.
Joomla sql Form Field Type
The sql form field type provides a drop down list of entries obtained by running a query on the Joomla database. If the field has a value saved, this value is selected when the page is first loaded. If not, the default value (if any) is selected.
Joomla subform Form Field Type
The subform form field type provides a method for using XML forms inside one another or reuse forms inside an existing form. If attribute multiple is set to true then the included form will be repeatable.
Joomla tel Form Field Type
The tel field type defines a field for entering a telephone number. Telephone numbers can be validated using the tel rule and filtered using the tel input filter.
Joomla captcha Form Field Type
The captcha form field type provides the use of a captcha plugin. Captcha is used on front-end forms to prevent unwanted submission of forms.
Step-by-step Guide For Creating Joomla 3.x Component
This is step-by-step actionable guide on how to create a Joomla Model-View-Controller (MVC) component from scratch.
Creating and Managing Joomla Database Tables
In Joomla, components usually manage content using the database. During the install, update or uninstall phase of a component, you can execute SQL queries through the use of SQL text files.
Working With Joomla Forms Using JForm Class
Form fields are fields in a HTML <form>. In Joomla, you can use JForm class to conveniently and flexibly create forms with a large amount of form fields. These form fields are stored in XML file.
Joomla Template Frameworks
Joomla template framework is a base skeleton template you can use to build more powerful Joomla templates. It means a clean, blank HTML/CSS skeleton with no colors, gradients, borders. You will just get get dimensions, margins, menu system styling.
Featured Articles in Joomla
Articles are assigned to categories, and menu link items are used to open the category or article, which displays in the content area of the website. Most websites have specific articles to be displayed on the front page, and these articles may be assigned to one, or different categories.
Types of Joomla Front Page Content
When a menu link item is created in any menu, the first action is to select a menu item type. Every website must have at least one menu. Joomla! websites can have many menus, and these can be set to display or not.
How to Create Article in Joomla
The majority of the content on a Joomla! website consists of articles. Articles are assigned to categories, regardless of its hierarchy or level. Subcategories (child categories) can be created and associated with any Category above (a parent category). There is no limit to the number of categories or subcategories that can be created.
How to View Module Positions of Joomla Template
The first question asked when a template is installed is, "Where are the module positions and what are they called?" You can easily determine the module positions of any installed Joomla template, whether being used or not.
How to Add Sorting & Ordering of Columns in Joomla Component
There are several steps required so that sorting works properly. The state variables list.ordering and list.direction are used to store the ordering column and ordering direction (ascending or descending).
How Different Joomla Modules Work
Joomla! comes with many installed modules. A Joomla! installation can have a number of modules that are installed but have not been included as functional content elements. This means that a module extension can be installed by the Extensions Manager, but not yet included to be part of a web page.
Introduction to Joomla
Joomla! was not created from the ground up. It was derived from another program called Mambo, using the open source software forking method, which enables you to use the source code and build on it with your own code.
10 Steps to Joomla Installation
If you have set up a web hosting account, installing Joomla includes four tasks.
Joomla filelist Form Field Type
The filelist form field provides a drop down list of files from a specified directory. If the field has a saved value this is selected when the page is first loaded. If not, the default value (if any) is selected.
Joomla calendar Form Field Type
The calendar form field type provides a text box for entry of a date. An icon next to the text box provides a link to a pop-up calendar, which can also be used to enter the date value. If the field has a saved value this is shown in the text box. Otherwise the default value, if any, is displayed.
Joomla category Form Field Type
The category form field type provides a drop down list of all published categories for a certain extension. If the parameter has a saved value this is selected when the page is first loaded. If not, the default value (if any) is selected.
Joomla email Form Field Type
The email form field type provides a text box for entry of an email address. If the field has a value saved, this value is displayed when the page is first loaded. If not, the default value (if any) is selected.
Joomla textarea Form Field Type
The textarea form field type provides a text area for entry of multi-line text.
Joomla radio Form Field Type
The radio form field type provides radio buttons to select different options. If the field has a saved value this is selected when the page is first loaded. If not, the default value (if any) is selected.
Joomla list Form Field Type
The list form field type provides a drop down list or a list box of custom-defined entries. If the field has a saved value this is selected when the page is first loaded. If not, the default value (if any) is selected.
Joomla editor Form Field Type
The editor field type provides a WYSIWYG (What You See Is What You Get) editor. You can change the editor configuration and access level display options at the back-end in the plugins section.
Joomla text Form Field Type
The text form field type provides a text box for data entry. If the field has a value saved, this value is displayed when the page is first loaded. If not, the default value (if any) is selected.
How to Enable Joomla Custom Fields
Custom fields in Joomla is introduced from 3.7 version. These can be added in your articles, contact forms and user profiles. Through custom fields, you have a seamlessly integrated way to show them on the front end.
Accessing User Information in Jooma
Accessing user information (like name, username, registered date) is very simple process in Joomla. getUser function of JFactory class returns a reference to the global user object. You can use this information about the current user in any part of your Joomla! extension. You only need to fetch the object and access the member variables.
Working with Joomla Database
To query data source, you can call a number of JDatabaseQuery methods like select, from, join, insert, update, delete, where and order. By using these method calls, you can create almost any query.
Main Joomla Controller File
The main entry point, helloworld.php, passes control to the controller, which handles performing the task that was specified in the request. At present, the component specific controller doesn't do anything more than the parent class already does, which is why the controller class is empty.
Entry Point File of Joomla Component
The file, site/helloworld.php, is the main entry point file for Joomla component. The main entry point passes control to the controller, which handles performing the task that was specified in the request.
Add a View to Joomla Site Part
When no task is given in the request variables, the default task will be executed. The default task is display. The JControllerLegacy class has such a task. When display is used, the 'view' variable will decide what will be displayed.
Add a Model to Joomla Site Part
The HelloWorldViewHelloWorld class, in the view.html.php file, asks the model for data using the get method of the JViewLegacy.
How To Get List of Items In Joomla
While developing extensions, you need to query database and display list of items. Joomla provides an easy way to achieve this.
Accessing Joomla Database With JTable
The JTable class is used in Joomla for creating, reading, updating, and deleting (CRUD) tasks for records in the database table. JTable provides many methods to make common manipulations to the table much simpler.
How To Add Search & Filtering in Joomla Component
Searching and Filtering is implemented through a form that is displayed above the list of items in the back-end. Site administrators can search or filter the data as per the fields defined in the form.
User State Variables in Joomla
Joomla has a built in functionality to make it easy for developers to store and retrieve variables that are stored with the session. There are two ways to set user state variables.
Get Single Item in Front End
The view asks the model for the item. In the model, you need the id of the item for querying the database. You can get this id from the Joomla system URL and store it as a state variable in the populateState(). You can also load the global parameters in the state variable.
How to Add Submenu in Joomla Component
You can a submenu using a helper file. The file is stored in helpers folder with the same name as the name of component name (without com_), or else submenus won't show in category view.
How Joomla Module Wrapper Works
This module shows an iframe window to specified location.
How Joomla Module Who's Online Works
he Who's Online Module displays the number of Anonymous Users (e.g. Guests) and Registered Users (ones logged-in) that are currently accessing the website.
How Joomla Module Latest Users Works
This module displays the latest registered users.
How to Create Overrides in Joomla
If you like to change the way a Joomla! Extension is displayed on your site, you can either re-code the extension from the scratch or you can use overrides. The standard output from any Joomla module or component can be overridden by adding code to the html directory of your template.
Joomla accesslevel Form Field Type
It provides a drop down list of accesslevel options with the current option selected.
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