JS--how to write event-driven

JS-------biased UI

Lightweight, dynamic scripting language

Can make web pages interactive:

Insert dynamic text into HTML (eg username, password)

Respond to events (eg: page load (action generated), user click)

Get the relevant type of the user's computer (eg: browser type)

Perform operations on the user's computer (eg: form validation)

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How to write js code to respond to events

Decide which element or control (button, mouse) to respond to

Write a js function (script function) with the code we want to run alert("message")---display a message to the user in a pop-up dialog

Attach a function to a control's event (to make a connection)

The element enclosed by the noscript tag does not contain any js script