What can JavaScript Do?

Event handlers can be used to handle, and verify, user input, user actions, and browser actions:
  • Things that should be done every time a page loads
  • Things that should be done when the page is closed
  • Action that should be performed when a user clicks a button
  • Content that should be verified when a user inputs data
  • And more ...
Many different methods can be used to let JavaScript work with events:
  • HTML event attributes can execute JavaScript code directly
  • HTML event attributes can call JavaScript functions
  • You can assign your own event handler functions to HTML elements
  • You can prevent events from being sent or being handled
  • And more ...

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