/***
@title:
Live Search

@version:
2.0

@author:
Andreas Lagerkvist

@date:
2008-08-31

@url:
http://andreaslagerkvist.com/jquery/live-search/

@license:
http://creativecommons.org/licenses/by/3.0/

@copyright:
2008 Andreas Lagerkvist (andreaslagerkvist.com)

@requires:
jquery, jquery.liveSearch.css

@does:
Use this plug-in to turn a normal form-input in to a live ajax search widget. The plug-in displays any HTML you like in the results and the search-results are updated live as the user types.

@howto:
jQuery('#q').liveSearch({url: '/ajax/search.php?q='}); would add the live-search container next to the input#q element and fill it with the contents of /ajax/search.php?q=THE-INPUTS-VALUE onkeyup of the input.

@exampleHTML:
<form method="post" action="/search/">

<p>
<label>
Enter search terms<br />
<input type="text" name="q" />
</label> <input type="submit" value="Go" />
</p>

</form>

@exampleJS:
jQuery('#jquery-live-search-example input[name="q"]').liveSearch({url: Router.urlForModule('SearchResults') + '&q='});
***/
jQuery.fn.liveSearch = function (conf) {
    var config = jQuery.extend({
        url: '/ajaxSearch.aspx?k=',
        id: 'searchresults',
        duration: 400,
        typeDelay: 200,
        loadingClass: 'loading',
        onSlideUp: function () { },
        uptadePosition: false
    }, conf);

    var liveSearch = jQuery('#searchresults');
    var request = null;

    return this.each(function () {
        var input = jQuery(this).attr('autocomplete', 'off');
        var liveSearchPaddingBorderHoriz = parseInt(liveSearch.css('paddingLeft'), 10) + parseInt(liveSearch.css('paddingRight'), 10) + parseInt(liveSearch.css('borderLeftWidth'), 10) + parseInt(liveSearch.css('borderRightWidth'), 10);

        // Re calculates live search's position
        var repositionLiveSearch = function () {
            var tmpOffset = input.offset();
            var inputDim = {
                left: tmpOffset.left,
                top: tmpOffset.top,
                width: input.outerWidth(),
                height: input.outerHeight()
            };

            inputDim.topPos = inputDim.top + inputDim.height;
            inputDim.totalWidth = inputDim.width - liveSearchPaddingBorderHoriz;

            liveSearch.css({
                position: 'absolute',
                left: inputDim.left + 'px',
                top: inputDim.topPos + 'px',
                width: inputDim.totalWidth + 'px'
            });
        };

        // Shows live-search for this input
        var showLiveSearch = function () {
            // Always reposition the live-search every time it is shown
            // in case user has resized browser-window or zoomed in or whatever
            repositionLiveSearch();

            // We need to bind a resize-event every time live search is shown
            // so it resizes based on the correct input element
            $(window).unbind('resize', repositionLiveSearch);
            $(window).bind('resize', repositionLiveSearch);

            liveSearch.slideDown(config.duration);
        };

        // Hides live-search for this input
        var hideLiveSearch = function () {
            liveSearch.slideUp(config.duration, function () {
                config.onSlideUp();
            });
        };

        input
        // On focus, if the live-search is empty, perform an new search
        // If not, just slide it down. Only do this if there's something in the input
			.focus(function () {
			    if (this.value !== '') {
			        // Perform a new search if there are no search results
			        if (liveSearch.html() == '') {
			            this.lastValue = '';
			            input.keyup();
			        }
			        // If there are search results show live search
			        else {
			            // HACK: In case search field changes width onfocus
			            setTimeout(showLiveSearch, 1);
			        }
			    }
			})
        // Auto update live-search onkeyup
			.keyup(function () {
			    // Don't update live-search if it's got the same value as last time
			    if (this.value != this.lastValue && this.value != '') {
			                input.addClass(config.loadingClass);

			                var q = this.value;

			                if (request != null) {
			                    request.abort();
			                }

			                // Start a new ajax-request in X ms
			                setTimeout(function () {
			                    request = jQuery.get(config.url + q, function (data) {
			                        input.removeClass(config.loadingClass);

			                        // Show live-search if results and search-term aren't empty
			                        if (data.length && q.length && data.indexOf("<ul>") != -1) {
			                            liveSearch.html(data);
			                            showLiveSearch();
			                            request.abort();
			                        }
			                        else {
			                            hideLiveSearch();
			                        }
			                    });
			                }, config.typeDelay);

			                this.lastValue = this.value;
			        }
			    else {
			        input.removeClass(config.loadingClass);
			    }
			});
    });
};