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HTML 

              
                <h1>Accessible auto-suggest</h1>

<!-- A live region to announce number of suggestions presented-->
<div id="announce" class="visually-hidden" aria-live="assertive"></div>
<div id="searchfield">
	<form>
		<label for="search">Suburb or Town Search</label>

		<!-- Search field.
aria-autocomplete is 'both'  -->
		<input role="combobox" id="search" type="text" class="biginput" autocomplete="off" aria-owns="res" aria-autocomplete="both">
		<!--<input id="hint" type="text" disabled class="biginput" />-->
		<input id="submit" type="submit" value="Search" class="button" />
	</form>
</div>

<div class="autocomplete-suggestions" id="search-autocomplete"></div>
<div class="info">
	<h2>Keyboard Interaction</h2>
	<ul>
		<li><strong>UP and DOWN:</strong> Cycles through auto-suggestions and input field.</li>
		<li><strong>ESC:</strong> Close the menu</li>
		<li><strong>ENTER:</strong> Select the currently focused auto-suggestion and close the menu.</li>
		<li><strong>TAB:</strong> Close the menu, leave what the user has typed in the textbox and move focus to the next focusable element.</li>
	</ul>
	<h2>Screen-reader Interaction</h2>
	<ul>
		<li>when search results are returned the count and instructions are announced.</li>
		<li>when suggestions are arrowed through they are announced.</li>
	</ul>
	<h2>ARIA</h2>
	<ul>
		<li><strong>input:</strong> aria-owns="search-autocomplete" aria-autocomplete="both" aria-activedescendant="suggestion-#"</li>
		<li><strong>div:</strong> id="res" role="listbox"</li>
		<li><strong>div:</strong> id="suggestion-#" role="option" aria-selected="false"</li>
	</ul>
	<h2>Download the slide pack</h2>
	<a href="https://www.dropbox.com/s/d8umok9s40dh6ik/The%20Anatomy%20of%20an%20Accessible%20Autosuggest%20-%20Melb%20Css%202016.pptx?dl=1">Download The Anatomy of an Accessible Autosuggest - Melb CSS September 2016 (.pptx, 2.23MB)</a>
	<h2>See the code</h2>
	<p><strong>Note:</strong> The link below may not work in IE.</p>
	<a href="view-source:http://playground.intopia.digital/melbcss/">View Source</a>
</div>
!

CSS 

              
                * {
	font-family: "Arial";
}

#res {
	margin: 0px;
	padding-left: 0px;
}

#res li {
	list-style-type: none;
}

#res li:hover,
#res li.highligt,
#res div:hover,
#res div.highligt {
	background: #110d3b;
	color: #fff;
	cursor: pointer;
}

#searchfield {
	display: block;
	width: 100%;
	text-align: center;
	margin-bottom: 5px;
}

#searchfield form {
	display: inline-block;
	background: #eeefed;
	padding: 5px;
	border-radius: 3px;
	margin: 5px 0 0 0;
}

#searchfield form .biginput {
	width: 600px;
	height: 40px;
	padding: 0 10px 0 10px;
	border: 1px solid #c8c8c8;
	border-radius: 3px;
	color: #000;
	font-weight: normal;
	font-size: 1.5em;
	-webkit-transition: all 0.2s linear;
	-moz-transition: all 0.2s linear;
	transition: all 0.2s linear;
	margin: 0 auto;
}

#searchfield form .biginput:focus,
input:focus {
	color: #000;
	border: 2px solid #005499;
	outline: none;
}

.autocomplete-suggestions {
	border: 1px solid #999;
	background: #fff;
	cursor: default;
	overflow: auto;
	height: 220px;
	width: 626px;
	margin: 0 auto;
	display: none;
}

.autocomplete-suggestion {
	padding: 10px 5px;
	font-size: 1.2em;
	white-space: nowrap;
	overflow: hidden;
}

.autocomplete-selected {
	background: #f0f0f0;
}

.autocomplete-suggestions strong {
	font-weight: normal;
	color: #3399ff;
}

.visually-hidden {
	position: absolute !important;
	clip: rect(1px 1px 1px 1px);
	padding: 0 !important;
	border: 0 !important;
	height: 1px !important;
	width: 1px !important;
	overflow: hidden;
}

body:hover .visually-hidden a,
body:hover .visually-hidden input,
body:hover .visually-hidden button {
	display: none !important;
}

#hint {
	position: absolute;
	left: 777px;
	z-index: 10;
	background-color: #fff;
	text-transform: capitalize;
}

#search {
	z-index: 11;
	background-color: #fff;
	position: relative;
	text-transform: capitalize;
}

.button {
	cursor: pointer;
}

.info {
	margin: 0 auto;
}

h1 {
	text-align: center;
}
!

JS 

              
                $(document).ready(function() {
	var suburbs = ["Aberfeldy Township", "Altona", "Arthurs Creek", "Arthurs Seat", "Ashwood", "Bacchus Marsh Werribee River", "Ballan", "Beaconsfield Upper", "Beenak", "Berwick", "Blackburn", "Blackburn North", "Blue Mountain", "Box Hill", "Braeside", "Braeside Park", "Broadmeadows", "Brooklyn", "Bulla", "Bulla North", "Bulleen", "Bundoora", "Burnley", "Burwood East", "Cambarville", "Cardinia", "Caulfield", "Caulfield North", "Cement Creek", "Christmas Hills", "Clarkefield", "Clarkefield", "Clayton", "Clearwater Aqueduct", "Coburg", "Coldstream", "Collingwood", "Craigieburn", "Craigieburn East", "Cranbourne", "Dandenong", "Dandenong South", "Dandenong West", "Darraweit", "Deer Park", "Devilbend Reservoir", "Diggers Rest", "Dixons Creek", "Doncaster", "Doncaster East", "Drouin West", "Durdidwarrah", "Eastern G.C. Doncaster", "Elsternwick", "Eltham", "Emerald", "Epping", "Essendon", "Fairfield", "Fawkner", "Fiskville", "Flemington", "Footscray", "Frankston North", "Frankston Pier", "Gardiner", "Glen Forbes South", "Glen Waverley", "Graceburn", "Graceburn Creek Aqueduct", "Greensborough", "Greenvale Reservoir", "Groom's Hill", "Hampton", "Hampton Park", "Hawthorn", "Headworks", "Healesville", "Heathmont", "Heidelberg", "Hurstbridge", "Iona", "Ivanhoe", "Kangaroo Ground", "Keilor", "Keilor North", "Kew", "Keysborough", "Kinglake", "Knox", "Konagaderra", "Kooweerup", "Lake Borrie", "Lancefield", "Lancefield North", "Launching Place", "Lilydale Lake", "Little River", "Loch", "Longwarry North", "Lower Plenty", "Lyndhurst", "Lysterfield", "Maribyrnong", "Maroondah Reservoir", "Melton Reservoir", "Melton Sth Toolern Creek", "Mentone", "Mernda", "Millgrove", "Mitcham", "Montrose", "Mooroolbark", "Mornington", "Mount Dandenong", "Mount Evelyn", "Mount View", "Mt Blackwood", "Mt Bullengarook", "Mt Donna Buang", "Mt Evelyn Stringybark Creek", "Mt Gregory", "Mt Hope", "Mt Horsfall", "Mt Juliet", "Mt Macedon", "Mt St Gwinear", "Mt St Leonard", "Mt Waverley", "Myrrhee", "Narre Warren North", "Nayook", "Neerim South", "Neerim-Elton Rd", "Neerim-Neerim Creek", "Neerim-Tarago East Branch", "Neerim-Tarago West Branch", "North Wharf", "Northcote", "Notting Hill", "Nutfield", "O'Shannassy Reservoir", "Oakleigh South", "Officer", "Officer South", "Olinda", "Pakenham", "Pakenham East", "Pakenham West", "Parwon Parwan Creek", "Poley Tower", "Preston", "Reservoir", "Ringwood", "Rockbank", "Romsey", "Rosslynne Reservoir", "Rowville", "Sandringham", "Scoresby", "Seaford", "Seaford North", "Seville East", "Silvan", "Smiths Gully", "Somerton", "Southbank", "Spotswood", "Springvale", "St Albans", "St Kilda Marina", "Sunbury", "Sunshine", "Surrey Hills", "Tarago Reservoir", "Tarrawarra", "Templestowe", "The Basin", "Thomson Dam", "Tonimbuk", "Toolern Vale", "Torourrong Reservoir", "U/S Goodman Creek Lerderderg River", "Upper Lang Lang", "Upper Pakenham", "Upper Yarra Dam", "Wallaby Creek", "Wallan", "Wantirna South", "Warrandyte", "Williamstown", "Woori Yallock", "Woori Yallock Creek", "Wyndham Vale", "Yallock outflow Cora Lyn", "Yannathan", "Yarra Glen", "Yarra Glen Steels Creek", "Yarra Junction", "Yarra River downstream Doctors Creek", "Yellingbo", "Yering"];
	var cache = {};
	var searchedBefore = false;
	var counter = 1;
	var highligtCounter = 0;
	var keys = {
		ESC: 27,
		TAB: 9,
		RETURN: 13,
		LEFT: 37,
		UP: 38,
		RIGHT: 39,
		DOWN: 40
	};
	$("#search").on("input", function(event) {
		doSearch(suburbs);
	});

	$("#search").on("keydown", function(event) {
		doKeypress(keys, event);
	});
});

function doSearch(suburbs) {
	var query = $("#search").val();
	$("#search").removeAttr("aria-activedescendant");
	//$('#hint').val('');

	if ($("#search").val().length >= 2) {

		//Case insensitive search and return matches to build the  array
		var results = $.grep(suburbs, function(item) {
			return item.search(RegExp("^" + query, "i")) != -1;

		});

		if (results.length >= 1) {
			$("#res").remove();
			$('#announce').empty();
			$(".autocomplete-suggestions").show();
			$(".autocomplete-suggestions").append('<div id="res" role="listbox" tabindex="-1"></div>');
			counter = 1;
		}

		//Bind click event to list elements in results
		$("#res").on("click", "div", function() {
			$("#search").val($(this).text());
			$("#res").remove();
			$('#announce').empty();
			$(".autocomplete-suggestions").hide();
			counter = 1;

		});

		//Add results to the list
		for (term in results) {

			if (counter <= 5) {
				$("#res").append("<div role='option' tabindex='-1' class='autocomplete-suggestion' id='suggestion-" + counter + "'>" + results[term] + "</div>");
				counter = counter + 1;
			}

		}
		var number = $("#res").children('[role="option"]').length
		if (number >= 1) {
			$("#announce").text(+number + " suggestions found" + ", to navigate use up and down arrows");
		}

	} else {
		$("#res").remove()
		$('#announce').empty();
		$(".autocomplete-suggestions").hide();
	}

}

function doKeypress(keys, event) {
	var highligted = false;
	highligted = $('#res').children('div').hasClass('highligt');
	switch (event.which) {

		case keys.ESC:
			$("#search").removeAttr("aria-activedescendant");
			//$('#hint').val('');
			$("#res").remove();
			$('#announce').empty();
			$(".autocomplete-suggestions").hide();
			break;

		case keys.RIGHT:

			return selectOption(highligted)
			break;

		case keys.TAB:
			$("#search").removeAttr("aria-activedescendant");
			//$('#hint').val('');
			$("#res").remove();
			$('#announce').empty();
			$(".autocomplete-suggestions").hide();
			break;

		case keys.RETURN:
			if (highligted) {
				event.preventDefault();
				event.stopPropagation();
				return selectOption(highligted)
			}

		case keys.UP:
			event.preventDefault();
			event.stopPropagation();
			return moveUp(highligted);
			break;

		case keys.DOWN:
			event.preventDefault();
			event.stopPropagation();

			return moveDown(highligted);
			break;

		default:
			return;
	}
}

function moveUp(highligted) {
	var current;
	$("#search").removeAttr("aria-activedescendant");
	//$('#hint').val('');
	if (highligted) {
		console.log("Highlighted - " + highligted + "");
		current = $('.highligt');
		current.attr('aria-selected', false);
		current.removeClass('highligt').prev('div').addClass('highligt');
		current.prev('div').attr('aria-selected', true);
		$("#search").attr("aria-activedescendant", current.prev('div').attr('id'));
		//$('#hint').val($('.highligt').text());
		highligted = false;
	} else {

		//Go back to the bottom of the list

		current = $("#res").children().last('div');
		current.addClass('highligt');
		current.attr('aria-selected', true);
		$("#search").attr("aria-activedescendant", current.attr('id'));
		//$('#hint').val($('.highligt').text());

	}
}

function moveDown(highligted) {

	var current;
	$("#search").removeAttr("aria-activedescendant");
	//$('#hint').val('');
	if (highligted) {
		console.log("Highlighted - " + highligted + "");
		current = $('.highligt');
		current.attr('aria-selected', false);
		current.removeClass('highligt').next('div').addClass('highligt');
		current.next('div').attr('aria-selected', true);
		$("#search").attr("aria-activedescendant", current.next('div').attr('id'));
		//$('#hint').val($('.highligt').text());
		highligted = false;
	} else {

		//Go back to the top of the list
		current = $("#res").children().first('div');
		current.addClass('highligt');
		current.attr('aria-selected', true);
		$("#search").attr("aria-activedescendant", current.attr('id'));
		//$('#hint').val($('.highligt').text());

	}
}

function selectOption(highligted) {
	if (highligted) {
		$("#search").removeAttr("aria-activedescendant");
		//$('#hint').val('');
		$('#search').val($('.highligt').text());
		$('#search').focus();
		$("#res").remove();
		$('#announce').empty();
		$(".autocomplete-suggestions").hide();
	} else {
		return;
	}
}
!
999px

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