Javascript page change demo

Javascript can change parts of the page in response to user actions, without reloading the entire page.

Here, when focus leaves quantity, total is re-calculated. This is entirely client-side. The server is not involved. Try entering text that is not a number.

View Source to see how this is done.

Quantity:	x Price: €4.22
Your name:
Total:	€0.00

---

• Could go further and validate with each character change:
  • JavaScript validate 'as you type' - onkeypress, onkeyup, onblur