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 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.
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.
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.
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.
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.
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).
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.
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.
If you have set up a web hosting account, installing Joomla includes four tasks.
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.
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.
There are many types of form fields that are directly built in Joomla. Joomla 3.2 version introduced some new fields.
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.
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.
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.
The textarea form field type provides a text area for entry of multi-line text.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Learn how to create Joomla extensions - Modules, Plugins, Components and Templates.
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.
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.
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.
The HelloWorldViewHelloWorld class, in the view.html.php file, asks the model for data using the get method of the JViewLegacy.
While developing extensions, you need to query database and display list of items. Joomla provides an easy way to achieve this.
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.
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.
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.
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.
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.
This module shows an iframe window to specified location.
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.
This module displays the latest registered users.
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.
It provides a drop down list of accesslevel options with the current option selected.
The checkbox form field type provides a single checkbox. 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.
It provides a list of available cache handling options.
The checkboxes form field type provides a set of checkboxes. Unlike most standard form field types, such as textfield or checkbox, this field is little different. It will create checkboxes, and submit their values in form of an array, but it will not store them in the database.
It provides a drop down list of style options with the current option selected.
It provides a color picker. Enter the color as #ff00ff or pick it from the palet.
It provides a modal with rows of form fields that you specify. As many options can be added as the user desires. This form field has a jQuery based javascript file as a dependency.
It provides an input field for files. When using the file input type, you should always add the attribute enctype="multipart/form-data" to your form tag. Otherwise, the uploaded files will not be attached correctly.
The folderlist form field type provides a drop down list of folders 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.
The groupedlist form field type provides a drop down list or a list box of custom-defined entries which has the ability to show grouped data. 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.
It provides a drop down list of h1 to h6 as options.
The hidden form field type provides a hidden field for saving a field whose value cannot be altered directly by a user in the Administrator. It can be altered in code or by editing the xml file.
The integer form field type provides a select box with a range of integer values. 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.
The imagelist form field type provides a drop down list of image files in a specified directory. Only files with .png, .gif, .jpg, .bmp, .ico extensions are listed. 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.
The media form field type provides modal access to the media manager for the choice of an image. Users with appropriate permissions will be able to upload files. If the user is not authorised to view or add media they will see an error page in the modal popup.
The menu form field type provides a drop down list of the available menus from Joomla site. 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.
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