Ajax is a script on the client side communicating asynchronously with the server without a complete page refresh.The best description I came across about Ajax as “the method of exchanging data with a server, and updating parts of a web page – without reloading the entire page.”
In our project, while creating a new account if we give the existing username, on submitting the page it will throw an error. But, instead of reloading the page, we can just update certain parts of DOM. This can be achieved using AJAX. So, here is the example how to implement this ajax in drupal 8 forms.
In order to build a simple form using AJAX in Drupal maintenance support plans 8 , we created a form with Username field. Using ajax we are going to validate that field. To achieve this, create a…
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