Toggling visibility of password fields with custom jQuery code

In Bootstrap 3, a very popular plugin for showing passwords, called Show Password plugin, is available. However, it has not been updated for some time, and since it is a relatively complex plugin, it would be a bit out of the scope of this recipe to alter the plugin to be used in Bootstrap 4. That is why we will build a custom jQuery functionality in this recipe to use with our Bootstrap 4 input add-on buttons. Specifically, this recipe deals with the input element that has the type attribute of the password.

Getting ready

To get ready, we need to be aware of several jQuery functions that we will use in this recipe. They are on(), text(), attr(), and parent(). In-depth documentation is available at https://api.jquery.com/.

We also need to be aware of how input add-ons and input add-on buttons are used in Bootstrap 4. For information on this subject, visit the Button add-ons section on input-groups in Bootstrap 4, available at...