//Gets the browser specific XmlHttpRequest Object
function getXmlHttpRequestObject() {
	if (window.XMLHttpRequest) {
		return new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		return new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		alert("Your Browser Sucks!\nIt's about time to upgrade don't you think?");
	}
}

//Our XmlHttpRequest object to get the auto suggest
var searchReq = getXmlHttpRequestObject();

//Since we only need to make one request at a time we only need one XmlHttpRequest instance unlike the Chat Tutorial where we needed two.

//Now we're going to create our function that will actually make the AJAX request.  This function will be called every time a key is released in the search textbox.

//Called from keyup on the search textbox.
//Starts the AJAX request.
function searchSuggest() {
	if(document.getElementById('postcode').value.length > 3) {
		if (searchReq.readyState == 4 || searchReq.readyState == 0) {
			var str = escape(document.getElementById('postcode').value);
			searchReq.open("GET", '/inc/php/searchSuggest.php?search=' + str, true);
			searchReq.onreadystatechange = handleSearchSuggest; 
			searchReq.send(null);
		}		
	}
}

//Called when the AJAX response is returned.
function handleSearchSuggest() {
	if (searchReq.readyState == 4) {
		var ss = document.getElementById('search_suggest')
		ss.innerHTML = '';
		var str = searchReq.responseText.split("\n");
		for(i=0; i < str.length - 1; i++) {
			var s2 = str[i].split("<<<>>>");
			//Build our element string.  This is cleaner using the DOM, but
			//IE doesn't support dynamically added attributes.
			var suggest = '<div onmouseover="javascript:suggestOver(this);" ';
			suggest += 'onmouseout="javascript:suggestOut(this);" ';
			suggest += 'onclick="javascript:setSearch('+s2[0]+',this.innerHTML);" ';
			//suggest += 'class="suggest_link">' + str[i] + '</div>';
			suggest += 'class="suggest_link">' + s2[1] + '</div>';
			ss.innerHTML += suggest;
		}
	}
}

//Mouse over function
function suggestOver(div_value) {
	div_value.className = 'suggest_link_over';
}
//Mouse out function
function suggestOut(div_value) {
	div_value.className = 'suggest_link';
}

//Click function
function setSearch(value1, value2) {
	document.getElementById('city').innerHTML = value2;
	document.getElementById('city_txt').value = value2;
	document.getElementById('city_id').value = value1;
	document.getElementById('search_suggest').innerHTML = '';
}