Displaying dynamic notifications/warnings on issues

While performing various operations in JIRA, you have probably noticed popup error/warning/info messages which notify the user about the status of the operation just performed. For example, a notification message is displayed to the user as soon as an issue is created, as shown here:

Displaying dynamic notifications/warnings on issues

How are these messages displayed? How hard is it to do something similar in a plugin?

As you might have guessed, JIRA does this with the help of built-in CSS classes or Javascript functions. AUI (Atlassian User Interface) components include messages to render such notifications on the page itself, while the AJS (Atlassian ...

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