select listbox item from textbox

[collie]

select listbox item from textbox

Hi, Can someone please help? I have a listbox and a textbox on my web form. the listbox is populated on page load from the db. I want the user to be able to type in a few letters into the textbox and accordingly the listbox will jump to the corresponding item. If the user lets say enters 'do' in the textbox and the listbox contains the items cat dog horse then dog will be selected. Hope I made myself understood​

 

[collie]

here is an example

Attached is an example of what i actually want to do. In yellowpages in the combobox 'select area' if the user types a letter on his keyboard then in the listbox it jumps to the item starts with the letter that the user typed.​