Prototype - Periodical Execution
Many times it is required to execute a function many times after a certain period of time. For example, you may want to refresh your screen after a given time. Prototype provides a simple mechanism to implement it using PeriodicalExecuter object.
The advantage provided by PeriodicalExecuter is that it shields you against multiple parallel executions of the callback function.
Creating a PeriodicalExecuter
The constructor takes two arguments −
- The callback function.
- The interval (in seconds) between executions.
Once launched, a PeriodicalExecuter triggers indefinitely, until the page unloads or the executer is stopped using stop() method.
Following is the example which will pop up a dialogue box after every 5 seconds untill you will stop it by pressing "cancel' button.