The submit handler just prints out the entered data to the screen, and is a simple way of showing the form in action. We'll be adding to this code throughout the rest of this post. This also allows for things like leap years to be taken into account so that the number of days in February can be dynamically altered. If we implement this using Drupal's ajax form update mechanisms we can show the correct number of days depending on the month selected. In this state the user can technically select the year, month and day, but because the form is static the number of days will always be the same. ![]() You wouldn't normally display the date as a set of select elements (although I have seen this before), but the data behind it is simple enough to understand and doesn't require any other aspects from Drupal to use. The simplest, independent and most universally accepted set of select elements I could think of is a date picker. The Formīefore jumping into the ajax components we need a form. ![]() I thought I would create a post to show how each system can be set up and where it can be used. There are also two different ways to set up this kind of system, both of which have their limitations. I found a lot of information out there on how to implement one system, but not the other. It does, however, require a few things to be in place first and so takes a little while to set up. As the user selects the first select element the second select element will populate with data and be shown on the screen. This is great for giving the user the ability to drill down into options that are dependent on each other. Using this system you can create a hierarchical system where one select will show and populate another select element with items dependent on the first. This means that any Drupal form can have a select element that shows and updates options into another select element within the same form. Read this issueĪ postal code validation callback with an ajax form element added in the hook_form_alter function.Tying together different select elements in a form is done with very little effort thanks to the ajax and states system built into Drupal 9. When you’ve added an Ajax option to an element which is added by another Ajax event before, then this event will fire only once.
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