Client-side events are driven by the browser in response to end-user interaction with the page. You can create jQuery Event Handlers that bind to jQuery events and run client-side JavaScript when they are triggered.
To use jQuery Event Handlers you will need to include a jQuery library in the Web Resources of your 
Page, 
Form or 
Theme.
Usually when you include a jQuery library its functions are available with the alias $, however, if your library uses a different alias, you must specify it in the jQuery Event Handler configuration.
To create a jQuery Event Handler, select the jQuery Tab in the Custom Event Handlers area of the 
HTML Element Properties dialog.
Events include:
- blur.
- change.
- click.
- doubleclick.
- error.
- focus.
- hover.
- keydown.
- keypress.
- keyup.
- mousedown.
- mouseover.
- mouseup.
- ready.
- resize.
- scroll.
- select.
- submit.
- unload.
You will need to specify a Locator (Id or class) in the HTML Element Properties window that will be used to bind the Event Handler to the Control.