Beginning JavaScript with DOM Scripting and Ajax, 2nd Edition

Chapter 6 ■ Common Uses of JavaScript: Images and Windows
Figure 6-13. Changing the window position and dimension
Animation with Window Intervals and Timeouts
You can use the setInterval() and setTimeout() window methods to allow for the timed execution of code.
setTimeout means you wait a certain time before executing the code (once only); setInterval() executes the code
every time the given time period has passed.
• name = setInterval('someCode', x ): Executes the JavaScript code passed to it as
someCode every x milliseconds
• clearInterval( name ): Cancels the execution of the interval called name (keeps the code
from being executed again)
• name=setTimeout('someCode', x ): Executes the JavaScript code someCode once, after
waiting x milliseconds
• clearTimeout( name ): Stops the timeout called name if the code hasn’t yet been run
■ ■Note The parameter someCode in setInterval() and setTimeout() is a function you’ve defined.
182
www.it-ebooks.info