011a. Adding Server side validation

In this chapter we will ...

Now, we want to create a view on the front end.

Newly created or Modified files

Newly created files

administrator/components/com_foos/Rule/LetterRule.php

Modified files

changelog.xml

foo_update.xml

administrator/components/com_foos/foos.xml

administrator/components/com_foos/forms/foo.xml

All changes at a glance

Click here to see all changes compared to the last chapter

More detailed explanations

File Structure

Example in Joomla 4

Side Note

Test your component

Now you can zip all files and install them via Joomla Extension Manager. After that you can see a link to your component in the left side menu. Clicking on this link will open the basic backend view.

Concluding Remark

It is no longer possible to save an invalid value. In large forms, it is not user-friendly to display all errors at the very end. Therefore, server-side validation is often supplemented with client-side validation, which checks during input. You can read more on this topic in the next chapter.

Now we have . Up to now we have no . We are going to work on this in the next chapter.

Overview of all files