A component is a kind of Joomla! Components are the main functional units of Joomla! An easy analogy would be that Joomla! Created by a component, content is usually displayed in the center of the main content area of a template depending on the template. Most components have two main parts: an administrator part and a site part. The site part is what is used to render pages of your site when they are requested by your site visitors during normal site operation.
The administrator part provides an interface to configure and manage different aspects of the component and is accessible through the Joomla! See also : Module , Plugin , Template. In the Joomla! MVC is a software design pattern that can be used to organize code in such a way that the business logic and data presentation are seperate. The premise behind this approach is that if the business logic is grouped into one section, then the interface and user interaction that surrounds the data can be revised and customized without having to reprogram the business logic.
MVC was originally developed to map the traditional input, processing, output roles into a logical GUI architecture. The model is the part of the component that encapsulates the application's data. It will often provide routines to manage and manipulate this data in a meaningful way in addition to routines that retrieve the data from the model.
In general, the underlying data access technique should be encapsulated in the model. In this way, if an application is to be moved from a system that utilizes a flat file to store its information to a system that uses a database, the model is the only element that needs to be changed, not the view or the controller. The view is the part of the component that is used to render the data from the model in a manner that is suitable for interaction.
For a web-based application, the view would generally be an HTML page that is returned to the user. The view pulls data from the model which is passed to it from the controller and feeds the data into a template which is populated and presented to the user. The view is the part of the component that is used to render the data from the model in a manner that is suitable for interaction. For a web-based application, the view would generally be an HTML page that is returned to the user.
The view pulls data from the model which is passed to it from the controller and feeds the data into a template which is populated and presented to the user. The view does not cause the data to be modified in any way, it only displays data retrieved from the model.
The controller is responsible for responding to user actions. In the case of a web application, a user action is generally a page request. The controller will determine what request is being made by the user and respond appropriately by triggering the model to manipulate the data appropriately and passing the model into the view.
The controller does not display the data in the model, it only triggers methods in the model which modify the data, and then pass the model into the view which displays the data. The simplified picture on the right depicts the basic components being used within Joomla.
Besides the Model, the View and the Controller, an Entry Point has been added that is depicted as a small circle. Attached to the viewer view a Template has been added. With these five components you should be able to understand this tutorial about making a basic Joomla!
MVC component. Part 1 of the tutorial only focuses on the Controller and the View with the use of the Template ; these are marked with the blue colour in the picture. Part 2 adds and Part 3 extends the model functionality for the data manipulation abstraction; marked with the green colour in the picture. Keep in mind that this simplified picture only applies for the site section i. An identical picture is applicable for the admin section i.
The administrative section is taken care of in Parts 4 through 6 of this component development tutorial. Both the site and the admin section are maintained and configured in an XML based installation file typically termed a manifest file. In Joomla! For learning purposes and debugging, adding a run-time debugger to your Joomla! A good example is the community project J! Dump that has the advantage of being a pop-up which leaves the view output unchanged. The J! Dump system allows you to view not only your development properties but also the methods.
Remember that the filename for the entry point must have the same name of the component. For example, if you call your component "Very Intricate Name Component", at install time see below in the hello. The site directory here is for the parts of the component which are installed in the front end site. Main article: Naming conventions. At this point it is important to say that some words are reserved for using in component or its class names, and violating some of that will produce a hard for debugging error.
One of them is "view" in any character case for view class subclass of JView and controller class subclass of JController , because view class need to have first part of name the same as controller class name, and component name although violating of last one won't produce an error, it's just a useful convention.
For our component, the URL would be:. This is automatically set by the framework so the developer doesn't have to worry about developing different versions for different server OSs. The 'DS' constant should always be used when referring to files on the local server. After loading the base controller, we check if a specific controller is needed. In this component, the base controller is the only controller, but we will leave this conditional check "in place" for future use. So if our URL is index.
After the controller is created, we instruct the controller to execute the task, as defined in the URL: index. If no task is set, the default task 'display' will be assumed. When display is used, the 'view' variable will decide what will be displayed. Other common tasks are save, edit, new The controller might decide to redirect the page, usually after a task like 'save' has been completed. This last statement takes care of the actual redirection.
The main entry point hello. Note that we don't use a closing php tag in this file:? The reason for this is that we will not have any unwanted whitespace in the output code. This is default practice since Joomla! Our component only has one task - greet the world. Therefore, the controller will be very simple.
No data manipulation is required. All that needs to be done is the appropriate view loaded. We will have only one method in our controller: display. Most of the required functionality is built into the JController class, so all that we need to do is invoke the JController::display method.
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