Can anyone put me in the right direction

hi all,

i have a list-component which is automatically filled using php. Everything works like it should. But here’s my question: I want a input textfield that can be used to narrow down the items in the list (so when you type “a” in the input field, all items that don’t start with “a” should disappear). anyone knows a good way to do this, or any tutorials?

thanks,

Ricardo