Cooking with JavaScript & DHTML
Subject:   a better mousetrap
Date:   2006-06-28 07:17:41
From:   jason2584
I've messed with Danny's script pretty extensively, and I ended up solving several of the problems mentioned here before I ran into the issue of the change event not firing for the select element. I'm still looking for the fix to that one, but I thought I'd post my code that doesn't have the num-pad problem or the problem where typing beyond a find starts the search over instead of staying on the first match. It's also shorter than the original, but I removed the comments, so you'll have to do your own dirty work to make changes to it. I hope it helps someone.

var taInfo = {
reset:function() { this.last=0; this.charsTyped=''; }

function typeAhead() {
if(window.event && !window.event.ctrlKey && window.event.keyCode > 19) {
var now = new Date();
if(taInfo.charsTyped == '' || now - taInfo.last < taInfo.delay) {
var ddl = window.event.srcElement;
taInfo.last = now;
taInfo.timeout = setTimeout('taInfo.reset()', taInfo.delay);
taInfo.charsTyped += String.fromCharCode(window.event.keyCode).toLowerCase();
for(var i=0; i < ddl.options.length-1; i++)
if(ddl.options[i].text.toLowerCase().indexOf(taInfo.charsTyped) == 0)
{ ddl.selectedIndex = i; break; }
window.event.returnValue = false;
return true;
return true;

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